CSLA .NET discussion

Adaptable Business Rules Question

lee_b — Fri, 03 Sep 2010 00:50:46 GMT

Hi,

Using CSLA 4, say I have a BusinessObject 'Question' with properties for a name, a type (can be numeric, alphanum, listbox,..), a list of options (for listbox style questions where the user can select an answer from a list) and an answer.

Each Question object will need to have it's own ruleset defined when it created; numeric should only be numeric, perhaps within a certain range (depending on the question), some Questions may Required an answer. Moreover, the rules on a question should be able to change dependant on the answer provided to another question (Answer 1 is required but only if Answer 2 is less than 20) or change something like the available answer options on a displayed listbox-type question.

I am playing with using a gate rule that would determine the requirements of the specific question and be able define the rules from there, but I am struggling to get anything going.

Has anyone done anything like this, or able to offer direction?

Many thanks.

LinqObservableCollection in Silverlight 4

Smith866 — Thu, 02 Sep 2010 22:34:14 GMT

I am having a problem with the LinqObservableCollection in CSLA 4 and Silverlight 4.

I have the following scenario: I have a root object that contains a list of child objects. In some situations, I want a filtered list of those child objects. In order to achieve this, I added a property of type LinqObservableCollection<Child> to my root object. In the getter, I perform a linq query on the list to give me the records that I want. When I do the fetch, everything works fine. I see my filtered list.

The problem is when I add items to the underlying list. I add the items to the actual child list, not the LinqObservableCollection. When I call save from my root object, I get the following exception:

System.Runtime.Serialization.InvalidDataContractException occurred

Message=Type 'Csla.LinqObservableCollection`1[Business.RmAdmin]' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.

StackTrace:

at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException(String message, Type type)

at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract(Int32 id, RuntimeTypeHandle typeHandle, Type type)

at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type)

at System.Runtime.Serialization.DataContract.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type)

at System.Runtime.Serialization.DataContract.GetDataContract(RuntimeTypeHandle typeHandle, Type type, SerializationMode mode)

at System.Runtime.Serialization.XmlObjectSerializerContext.GetDataContract(RuntimeTypeHandle typeHandle, Type type)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithXsiType(XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle objectTypeHandle, Type objectType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle, Type declaredType)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.InternalSerialize(XmlWriterDelegator xmlWriter, Object obj, Boolean isDeclaredType, Boolean writeXsiType, Int32 declaredTypeID, RuntimeTypeHandle declaredTypeHandle)

at WriteSerializationInfo.FieldDataToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at WriteKeyValueOfstringSerializationInfo.FieldDataOzoZvLrmToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at WriteArrayOfKeyValueOfstringSerializationInfo.FieldDataOzoZvLrmToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )

at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at WriteSerializationInfoToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , ClassDataContract )

at System.Runtime.Serialization.ClassDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at WriteArrayOfSerializationInfoToXml(XmlWriterDelegator , Object , XmlObjectSerializerWriteContext , CollectionDataContract )

at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)

at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph)

at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)

at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)

at System.Runtime.Serialization.DataContractSerializer.WriteObject(XmlWriter writer, Object graph)

at Csla.Serialization.Mobile.MobileFormatter.Serialize(XmlWriter writer, Object graph)

InnerException:

Does anybody know why this is happening or what I might be doing wrong?

Is there a way to MarkBusy a BusinessListBase?

c_manboy — Thu, 02 Sep 2010 21:57:41 GMT

I'm using the BusyAnimation for WPF and have bound IsRunning to my BusinessListBase's IsBusy property as suggested. It works wonderfully.

I have a public method on my BusinessListBase that recalculates all the child objects data which can take about 10 - 15 seconds. I'd love to set the IsBusy property when this runs so that my BusyAnimation executes.

I have tried executing a second BusyAnimation but it does not seem to be firing...at least it's not displaying.

Is there anyway to mark the list as busy?

Web App: CSLA and non-CSLA parts

cjherasmus — Thu, 02 Sep 2010 08:23:37 GMT

I have a company internet web app and would like to convert it to use CSLA. There are company users that can maintain data and internet (non-company) users that can only search and download.

The default page of the web app is a document search and download page that needs to be exposed to the both company users and internet users. I assume using CSLA for this page won't work because of the full trust issue.

To get from the default page to the rest, users would require to log in.

Would it be possible to have the default page running without CSLA, and login with the rest of the webapp running with CSLA? For the default page I could just use "normal" ADO methods. The environment doesn't allow Silverlight.

Separate out the DataPortal?

tmg4340 — Thu, 02 Sep 2010 15:26:19 GMT

This post:

http://forums.lhotka.net/forums/t/9430.aspx

Ended up with a short discussion about some projected changes to the DataPortal. While this question doesn't directly pertain to that, it did raise another question in my head. So rather than divert the original post even further, I figured I'd start a new one.

What's the possibility of essentially segregating the DataPortal out into a standalone assembly in a future version of CSLA? It's been mentioned a couple of times that the DataPortal doesn't really have any dependency on CSLA objects - any serializable object can move through the DataPortal.

The reason I ask is that we're starting to get into SL development, and while I don't think I could convince folks to use the full CSLA, I very well could convince them to use the DataPortal as our transport mechanism between client and server. I think that would be a real boon to our development, and would save us a whole bunch of time that would essentially be spent "re-inventing the wheel". So being able to grab that piece in its entirety easily would be beneficial.

I'm sure some folks would say that if I can convince them of using the DataPortal, moving to the full CSLA isn't that far behind. From my perspective, that's not necessarily the case. Using the DataPortal could be considered a "black box" that doesn't significantly impact the programming model, while moving full-force to CSLA objects is a much more... well, intrusive change.

(And yes, while I realize that anything we do build in-house is likely going to replicate a fair amount of the CSLA codebase, we already have some developers who do not share my views on the value of the CSLA structure for business objects. One fight at a time...)

- Scott

Is Csla.InvokeMethod out, On the Way out, or still In

Jav — Wed, 01 Sep 2010 15:27:06 GMT

I read in some posts that Csla.InvokeMethod is on Life Support, but I see it alive and kick'n in Csla 4.01

Can we have a status report on this. Personally, I kinda like Csla.Invoke method, at least it is physically attached to a given button, TextBox etc. After adding dozens and dozens of UI Controls to a page, the prospect of scattering an equal or more of these TriggerAction thingies just doesn't look too appealing. And then you are scrolling up and down to find who does what and how!!

I would vote for keeping both - with equal rights please :)

Jav

CSLA and LINQ to SQL invokes Distributed Transaction Coordinator

Joe McPherson — Wed, 01 Sep 2010 19:53:13 GMT

I am trying to use CSLA with LINQ to SQL as data access mechanism. Most things have gone well until recently when I started getting an error. When updating a child record, I receive the following error message:

System.Transactions.TransactionManagerCommunicationException: Communication with the underlying transaction manager has failed.

I am modeling my code off of the ProjectTracker sample that uses LINQ as the DAL. I establish the context with code similar to the following:

using (var ctx = ContextManager<DAL.PetshopDataContext>.GetManager("PetShopConnectionString"))
{.....}

From what I understand the MSDTC is most likely getting invoked because a second connection is being opened somewhere but I cannot seem to locate where this may be occurring. My application only accesses one database at this time. If any one has any ideas where I may want to look to correct this issue I would greatly appreciate the help.

I can provide more detail or upload the app if necessary.

LINQ to CSLA (Chapter 14)

Rene Elizondo — Wed, 28 Oct 2009 14:59:14 GMT

Hello

I am hoping to hit chapter 14 of the book pretty soon (this weekend if all goes well). The chapter is titled LINQ to CSLA.

Before I read the chapter and spend time dinging into it, I would like to know if someone could tell if the chapter still relevant or not.

The reason why I ask is because on one post Rocky wrote “And I think the LINQ to CSLA implementation (at least LinqBindingList) was a mistake”. I realize that he was being specific about the LinqBindingList implementation but I kind of got the feeling (reading between the lines) that he may not be too happy about the whole LINQ to CSLA implementation.

I am sure that digging into LINQ to CSLA would be a good learning experience no matter what, but right now, I rather spend the time digging into other parts of the framework that may be more beneficial to me at this point…… I thought that catching up from CSLA 2.x to 3.x was going to be a breeze but I was wrong!!

Thank you.

remote data portals slow performing in win2008/IIS7 configuration

galinabetz — Tue, 31 Aug 2010 17:12:23 GMT

we just moved our CSLA remote servers from Win2003/IIS6 to win2008/IIS7 just to notice that performance degraded to the point that it takes our calling website timeouts when the remote objects are requested - please, any suggestions would be most appreciated!

Thanks a lot,

Getting all broken rules within an object graph with object graph position for each broken rule

snakebyteme — Tue, 31 Aug 2010 15:56:57 GMT

We keep running into issues where developers on our team hook up a UI to a large object graph and then have trouble saving the parent object due to invalidity existing in various child objects.

I came up with an idea:

Serialize the object graph to XML and parse the XML to return a list of broken rules with each broken rule containing its object graph position (parent.child.grandchild).

Due to my lack of XML parsing skills, I ended up writing a function that returned the broken rules (without object graph location) using regular expression.

Can someone point me in the right direction on how to parse the XML from Csla.Serialization.NetDataContractSerializerWrapper so I can get the broken rule with the object graph location?

I feel like this could be a real time saver for development teams using CSLA if developers are able to quickly identify all broken rules and their location.

    Public Shared Function GetBrokenRules(ByRef obj As Object) As List(Of String)
        GetBrokenRules = New List(Of String)
        Dim responsePattern As String = "RuleName: {1}{0}Severity: {2}{0}Description: {3}"
        Dim brokenRulePattern As String = "\<[a-z]*:*BrokenRule z:Id=""\d+""\>(.*?)\</[a-z]*:*BrokenRule\>"
        Dim descriptionPattern As String = "\<[a-z]*:*_description z:Id=""\d+""\>([\d\D]+)\</[a-z]*:*_description>"
        Dim severityPattern As String = "\<[a-z]*:*_severity\>(.+)\</[a-z]*:*_severity>"
        Dim ruleNamePattern As String = "\<[a-z]*:*_ruleName z:Id=""\d+""\>([\d\D]+)\</[a-z]*:*_ruleName>"

        Dim mySerializer As New Csla.Serialization.NetDataContractSerializerWrapper
        Dim myStream As New MemoryStream
        mySerializer.Serialize(myStream, obj)
        myStream.Position = 0
        Dim myXMLString As String = ""
        Using myStream
            Using myStreamReader As New StreamReader(myStream)
                myXMLString = myStreamReader.ReadToEnd
            End Using
        End Using

        Dim matches As MatchCollection = Regex.Matches(myXMLString, brokenRulePattern)
        myXMLString = Nothing

        For Each itemMatch As Match In matches
            Dim descriptions As MatchCollection = Regex.Matches(itemMatch.Value, descriptionPattern)
            Dim severities As MatchCollection = Regex.Matches(itemMatch.Value, severityPattern)
            Dim ruleNames As MatchCollection = Regex.Matches(itemMatch.Value, ruleNamePattern)
            Try
                GetBrokenRules.Add(String.Format(responsePattern, vbCrLf, Regex.Replace(ruleNames.Item(0).Value, ruleNamePattern, "$1", RegexOptions.IgnoreCase), _
                                                  Regex.Replace(severities.Item(0).Value, severityPattern, "$1", RegexOptions.IgnoreCase), _
                                                  Regex.Replace(descriptions.Item(0).Value, descriptionPattern, "$1", RegexOptions.IgnoreCase)))
            Catch
            End Try

        Next

    End Function

CanReadProperty not working with custom AuthorizationRule

marthac — Mon, 30 Aug 2010 15:47:35 GMT

I have the visibility of my StackPanel dependant on the results of CanRead using a PropertyStatus like so:

This works if I explicitely add a check for the Property in my CanReadProperty function in my class:

        public override bool CanReadProperty(IPropertyInfo property)
        {   // handle per instance field security
            System.Diagnostics.Debug.WriteLine("CanReadProperty: " + property.Name);
            if (property.Name == SsnStatusMonikerProperty.Name)
                return false;

            return BusinessRules.HasPermission(Csla.Rules.AuthorizationActions.ReadProperty, property);
//            return base.CanReadProperty(property);
        }

But if I comment out the if statement above I'm expecting it to use the custom AuthorizationRule (used to do per instance auth checking). But it never executes the rule.
How do I get it to execute the custom AuthorizationRule??

It is defined as follows:

    public class UsiHiddenField : AuthorizationRule
    {
        private List<string> _roles;

        /// <summary>
        /// Creates an instance of the rule.
        /// </summary>
        /// <param name="roles">List of allowed roles.</param>
        public UsiHiddenField(IUsiPropertyInfo property, List<String> roles)
            : base(Csla.Rules.AuthorizationActions.ReadProperty, property)
        {
            System.Diagnostics.Debug.WriteLine("UsiHiddenField ctor" + property.DatabaseName);
            _roles = roles;
        }

        /// <summary>
        /// Rule implementation.
        /// </summary>
        /// <param name="context">Rule context.</param>
        protected override void Execute(AuthorizationContext context)
        {
            System.Diagnostics.Debug.WriteLine("UsiHiddenField.Execute()");
            if (_roles.Count > 0)
            {
                foreach (var item in _roles)
                {
                    if (Csla.ApplicationContext.User.IsInRole(item))
                    {
                        context.HasPermission = true;
                        break;
                    }
                }
            }
            else
            {
                context.HasPermission = true;
            }
            if (context.HasPermission == true)
            {
                System.Diagnostics.Debug.WriteLine("UsiHiddenField: has permission to read, checked roles - now if tgt not null check for hidden field");
                if (context.Target != null)
                {   // do instance auth check here - how???
                    bool hidden = false;
                    // invoke method in derived class to check for hidden fields
                    BindingFlags flags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;
                    System.Reflection.MethodInfo method = context.TargetType.GetMethod("UsiCheckHiddenField", flags, null, new Type[] { typeof(IMemberInfo) }, null);
                    System.Diagnostics.Debug.WriteLine("UsiCheckHiddenField()");
                    if (method != null)
                        hidden = (bool)method.Invoke(null, new object[] { Element });
                    context.HasPermission = !hidden;
                }
            }
        }
    }

The method referenced in the custom AuthorizationRule above is defined in my base class implementation as follows:

        protected static bool UsiCheckHiddenField(IMemberInfo property)
        {
            bool hidden = false;
            IUsiPropertyInfo usiProperty = property as IUsiPropertyInfo;
            String msg = String.Format("UsiCheckHiddenField(), client type: {0}, client phase: {1}, property: {2} ",
                _clientType, _clientPhase, property.Name);
            System.Diagnostics.Debug.WriteLine(msg);
            Int32 reqDefConfigId = UsiReqDefConfiguration.LoadReqDefConfigId(_clientType, _clientPhase);
            if (reqDefConfigId != -1)
            {   // if there exists a req_def_config - load any required fields for this table
//                IUsiPropertyInfo usiProperty = PrimaryProperty as IUsiPropertyInfo;
                if (UsiReqDefConfiguration.IsHiddenField(reqDefConfigId, TableName, usiProperty.DatabaseName) == true)
                {
                    msg = String.Format("IsHiddenField(), client type: {0}, client phase: {1}, property: {2} ",
                        _clientType, _clientPhase, property.Name);
                    System.Diagnostics.Debug.WriteLine(msg);
                    hidden = true;
                }
            }

return hidden;
}

In my base class implementaton it is used as follows:

        protected override void AddBusinessRules()
        {
            base.AddBusinessRules();

            // db field rules (length, required, etc)
            BusinessRules.AddRule(new Csla.Rules.CommonRules.Required(OidProperty));
            BusinessRules.AddRule(new Csla.Rules.CommonRules.MaxLength(OidProperty, 32));

            // now load field security settings from db for each property
            List<String> readRoles = null;
            List<String> writeRoles = null;
            SqlCommand sqlCommand;
            String sqlQuery,
                    user;
            Int32   canRead,
                    canWrite;

            using (SqlConnection connection = new SqlConnection(SqlHelper.ConnectionString))
            {
                connection.Open();
                sqlQuery = String.Format("SELECT DISTINCT USER_OR_GROUP, CAN_READ_DATA, CAN_WRITE_DATA FROM SECURITY_REPORT_PERMISSIONS WHERE SEC_TABLE = '{0}' AND SEC_COLUMN = @p_SEC_COLUMN", TableName);
                sqlCommand = new SqlCommand(sqlQuery, connection);
                foreach (var field in UsiProperties)
                {
                    readRoles = new List<String>();
                    writeRoles = new List<String>();
                    sqlCommand.Parameters.AddWithValue("@p_SEC_COLUMN", field.DatabaseName);
                    System.Diagnostics.Debug.WriteLine(sqlQuery + " where @p_SEC_COLUMN = " + field.DatabaseName);
                    using (var reader = new SafeDataReader(sqlCommand.ExecuteReader()))
                    {
                        if (reader.Read())
                        {
                            do
                            {
                                user = reader.GetString("USER_OR_GROUP");
                                canRead = reader.GetInt32("CAN_READ_DATA");
                                canWrite = reader.GetInt32("CAN_WRITE_DATA");
                                if (canRead == 1)
                                    readRoles.Add(user);
                                if (canWrite == 1)
                                    writeRoles.Add(user);
                            } while (reader.Read());
                        }
                    }
                    // if no one has access - store "NOBODY" as the role - by default everyone has access when no roles are defined
                    if (readRoles.Count == 0)
                    {
                        System.Diagnostics.Debug.WriteLine("No one can read field");
                        readRoles.Add("NOBODY");
                    }
                    if (writeRoles.Count == 0)
                    {
                        System.Diagnostics.Debug.WriteLine("No one can write field");
                        writeRoles.Add("NOBODY");
                    }
                    // store roles for this property
//                    if (InClientTree() == true)
                    //{   // if in client tree - store roles for lookup in custom Authorization rule class
                    BusinessRules.AddRule(new UsiHiddenField(field, readRoles));
                    //}
                    //else
                    //{   // use class level auth - all instances of this class use IsInRole auth
                        //BusinessRules.AddRule(new Csla.Rules.CommonRules.IsInRole(Csla.Rules.AuthorizationActions.ReadProperty, field, readRoles));
                    //}
                    BusinessRules.AddRule(new Csla.Rules.CommonRules.IsInRole(Csla.Rules.AuthorizationActions.WriteProperty, field, writeRoles));
                    sqlCommand.Parameters.Clear();
                }
            }
            if (InClientTree() == true)
            {   // if in client tree - implement custom rule classes that work differently based on provider type, client type & client phase
                // here we deal with required/desired fields - hidden fields need to be dealt with in the CanReadProperty function
                // - cannot have duplicate rules for AuthorizationActions.ReadProperty action
                foreach (var field in UsiProperties)
                {
                    BusinessRules.AddRule(new UsiRequiredField(field, ClientTypeProperty, ClientPhaseProperty, TableName));
                    BusinessRules.AddRule(new UsiDesiredField(field, ClientTypeProperty, ClientPhaseProperty, TableName));
                }
            }

AddUsiBusinessRules();
}

Transaction timeout problem

IgorB — Thu, 26 Aug 2010 15:35:24 GMT

I created a pretty simple business object (I use CSLA 4.0 with WinForms frontend) with one child collection. There are complex computations on the Database side when child element is inserted – it can take several seconds per row. I increased CommandTimeout to 600, so it should be enough for saving required amount of information (totally about 2-3 minutes). When I try to save main business object with several rows, the transaction stops after 60 sec with a message:

“DataPortal.Update failed (Csla.DataPortalException: ChildDataPortal.Update failed on the server ---> Csla.Reflection.CallMethodException: Child_Update method call failed ---> Csla.DataPortalException: ChildDataPortal.Update failed on the server ---> Csla.Reflection.CallMethodException: Child_Insert method call failed ---> System.InvalidOperationException: The transaction associated with the current connection has completed but has not been disposed. The transaction must be disposed before the connection can be used to execute SQL statements. …)”

I tried to increase transaction timeout in component services on client and server machines, but that didn’t help. Do you have any idea, why I cannot run any transaction for more than 1 min?

Thank you very much in advance.

CSLA Light & Lazy Loading

CampbellCM — Tue, 07 Apr 2009 13:37:03 GMT

Is it possible to do lazy loading of child objects with CSLA Light? If so, is there an example of how to do that?

upgrading from Csla 3.8.2 to 4.0 using Silverlight 4 and VB

germie — Tue, 31 Aug 2010 20:26:22 GMT

are there any examples out there that use the mvvm approach accessing data through wcf?
thank you
germie

CSLA Light - No Project Linker for VS2010

Jack — Mon, 26 Apr 2010 15:34:30 GMT

Since there is no Project Linker for VS2010 what are people doing to keep their Library.Server and Library.Client projects synced up? Back to the old way of Add as Reference?

I found a couple google hits on re-compiling the source code for Project Linker but the set of things to have in place was pretty convoluded.

Thanks

jack

Trying to bind a sorted EditableRootList to a DataGrid

Mike78 — Tue, 31 Aug 2010 15:43:10 GMT

I have a DataGrid on my xaml page that I would like to be sorted when the page first loads. I realize I could just sort the data in my stored procedure, but I would prefer to do it in code. I thought this would be easy, but it's turning out to be much more difficult than I had anticipated.

I can bind my DataGrid to my EditableRootList object (my Model) well enough, but it's the sorting that's giving me trouble. I'm trying to do the sort in my ViewModel class with a method similar to the following.

protected override void OnRefreshed()
{
     base.OnRefreshed();
     if (Model != null)
     {
          var sortedList = (from item in Model orderby item.MyFieldName select item);
          Model = (Business.CustomerList)sortedList;
     }
}

My code compiles, but at runtime the last line of this method raises an InvalidCastException.

Has anyone else had any luck with this situation? I'm using Silverlight 4, C# 4, and CSLA 4.

Silverlight novice needs help

griff — Tue, 31 Aug 2010 10:03:54 GMT

Gone back to basics....two fields, one button...field accepts an ID, button goes and gets BO and populates field2. Using latest Codesmith templates (3.0).

here is my "Asynchronous Root Factory Method"

Public Shared Sub GetByProductIdAsync(ByVal productId As System.String, ByVal handler As EventHandler(Of DataPortalResult(Of Product)))

Dim dp As New DataPortal(Of Product)()

AddHandler dp.FetchCompleted, handler

Dim criteria As New ProductCriteria()

criteria.ProductId = productId

dp.BeginFetch(criteria)

End Sub

Button behind code is....

Private Sub LoadData(ByVal ID As String)

Dim bo As Business.Product = Business.Product.GetByProductIdAsync(ID,?????????? )

ProdDesc.Content = bo.Description

End Sub

I don't know what to put for the ???????? (it's expecting ByVal handler As EventHandler(Of DataPortalResult(Of Product))

Please can you help...

Richard

MarkAsNew() taking a long time when done for each item in a BusinessBaseLIst

snakebyteme — Tue, 31 Aug 2010 14:09:07 GMT

He is the scenario:

We are using CSLA 3.8.4. We execute a stored procedure to generate invoice detail rows. We load them into a BBList , so they are marked as clean since they were fetched. We use "lazy instantiation" in our child object properties (if Me.IsNew and FieldManager not exists then obj.CreateChild). We run some post processing routines that evaluate the invoice detail rows. Before we call the parent's save method, we do a "for each detail in BBLIst {detail.MarkAsNew()}" which will give use the desired object state to force insertion into the database.

If I mark the objects as new before I add them to the BBList, there is no delay but I run into lazy instantiation problems since the parent is new.

If I mark each item in the BBList as new right before the save, the lazy instantiation problems are solved since all evaluation was done on clean objects, but it can take 45 minutes to mark 5000 objects as new.

For now, I have added a boolean property in the BB subclass called DisableLazyInstatiation and have added it to our lazy instantiation code. I mark the object as new before it is added to the BBList and set the flag to block lazy instantiation. This is not an ideal solution for me.

It seems odd that it takes so long for a boolean flag (IsNew) to be set for each item in a collection. Obviously more is being done than just setting the boolean value.

Does anyone have a suggested way to mark an entire BBList's contents as new quickly?

Invalidating FieldManager Data

Blake Niemyjski — Thu, 22 Jul 2010 16:40:39 GMT

Hello,

I have a situation where I would like to remove or invalidate objects from the FieldManager. I'm not aware how people handle this but I am open to the best solution :).

I'm referring to a sample thats located here that will reproduce this issue. There is a case where you will have a child property that is loaded via LoadProperty:

public Diagnosi DiagnosiMemberByPrincipalDiagnosisID

{

get

{

if(!PrincipalDiagnosisID.HasValue)

return null;

if(!FieldManager.FieldExists(_diagnosiMemberByPrincipalDiagnosisIDProperty))

{

....

The user may change the PrincipalDiagnosisID to point to a different record. In this case, the FieldManager Object needs to be marked as dirty so it can be reloaded. I'm thinking the best place for this would be in the Child_Update.

// Update foreign keys values. This code will update the values passed in from the parent only if no errors occurred after executing the query.

if (patient != null && patient.PatientID != this.PatientID)

{

LoadProperty(_patientIDProperty, patient.PatientID);

//Mark DiagnosiMemberByPrincipalDiagnosisID As Dirty via FieldManager....

}

Thanks

-Blake

CSLA 4 OnChildChanged SL4

JJ — Mon, 30 Aug 2010 09:06:38 GMT

is there any reason why the OnChildChanged will not work in CSLA 4 SL4?

//parent

public partial class OrgStructureER : BusinessBase<OrgStructureER>
{

protected override void OnChildChanged(Csla.Core.ChildChangedEventArgs e)

{

// not throwing

}

we change properties in this child:

private static readonly PropertyInfo<CompanyEC> CompanyProperty = RegisterProperty<CompanyEC>(p => p.Company, RelationshipTypes.Child);
        public CompanyEC Company
        {
            get
            {
                //if (FieldManager.FieldExists(CompanyProperty))
                    return ReadProperty(CompanyProperty);
                //else
                //    return null;

            }
            set
            {
                LoadProperty(CompanyProperty, value);
            }
        }

// child is a BusinessBase

I tried al the diffrent RelationshipTypes... not working ...

Do you test common buisness rules?

davekaro — Thu, 26 Aug 2010 18:23:53 GMT

I'm wondering if people here write tests for the common rules they may add to a business object. For example, say you have a business object with these rules:

protected override void AddBusinessRules()
{
this.BusinessRules.AddRule(new Csla.Rules.CommonRules.Required(TitleProperty));
this.BusinessRules.AddRule(new Csla.Rules.CommonRules.MaxLength(DescriptionProperty, 300));
}

would you then write tests like:

var businessObject = BuisnessObject.NewBusinessObject();
Assert.IsFalse(businessObject.IsValid);
Assert.IsTrue(businessObject.BrokenRulesCollection.Contains("rule://csla.rules.commonrules.required/Title"));

businessObject.Title = "test";

Assert.IsFalse(businessObject.BrokenRulesCollection.Contains("rule://csla.rules.commonrules.required/Title"));

Or something along those lines. If you do do this, why? If you don't do this, why?

Dave

Edit Level Mismatch in AcceptChanges

t.kehl — Mon, 30 Aug 2010 20:44:12 GMT

Hi.

I have the fallowing object-tree:

Company (EditableRoot)
|--- BranchList (Childlist)
          |--- Branch (Child)
          |--- Branch (Child)
          |--- Branch (Child)

The Branch-object has a Property Parentbrach which is also of the type Branch (Child)

Now, when I add a new object to the Branchlist and then I set the new Branch as ParentBranch of an exisiting Branch I will get a "Edit Level Mismatch" Exception when I save the Company-Object. This is logical, then the same object exists in the BranchList and as a property (ParentBranch) on a Child-Element of the list. When I save the company-object, CSLA will call AcceptChanges twice on the same object (the first one in the BranchList and the second one on the Property ParentBranch).
The reason for my situation is the fallowing:
I have a window for editing the Company-object. On this window, there is also a Grid which show the BranchList. In the Grid it is also possible to add a new Branch and set a exisiting branch as a ParentBranch of a existing (or new) Branch. For the source to select a ParentBranch, I use the same List which will be shown in the grid. The reason for this is, that I also can select new added (and currently not saved) branches as ParentBranche. Now, I am searching a way, that CSLA will also save the Property ParentBranch of a Branch - but will not execute AcceptChanges on the objects which are set as ParentBranch.

I hope my goal is clear and anybody can help me :-) - Thank you!

Best Regards, Thomas

Windows Authentication Issue

Smith866 — Mon, 30 Aug 2010 17:23:58 GMT

Hi,

I am currently experiencing a problem getting windows authentication working with my CSLA 4 SL application. I have setup windows authentication the same way as the samples from the Silverlight videos. When I run the application from my development workstation, everything works fine. I then setup my development and test web servers using IIS 7.5. I worked through many issues getting impersonation to work (starting with just ASP.NET, then adding CSLA and SL). It all seems to work fine. I can open a browser on my development machine (or any other machine on that domain), go to the development or test web server and the authentication all works. Now here is where I encounter an issue: My testers log in to another domain. There is no trust relationship whatsoever between their domain and the domain where I host my CSLA SL app. I have given them all accounts on this new domain, and I let their browser prompt them for credentials to log in to the domain where they do their testing. In the ASP.NET world, everything works fine - ie. a call to System.Security.Principal.WindowsIdentity.GetCurrent() works - it shows their logged in user and groups. My next step was to add CSLA / SL to the mix. When I did this, I got some interesting results. The authentication wasn't working, so I started troubleshooting to see where the problem was. I ended up setting up remote debugging on my development web server so I could see what was going on. I found that everything on the server-side seems to be working just fine. I stepped through WindowsIdentity.PopulateWindowsIdentity() and I can see everything working fine. The server knows who they logged in as, what groups they are in, etc. The server seems to be doing the exact same thing in the success scenario (same domain) and the fail scenario (coming from another domain)

As it turns out, I am actually getting an exception on the client side. Here are the exception messages and stack traces that the client is throwing:

---------------------------

[TypeInitialization_Type]

Arguments: Csla.Silverlight.Security.WindowsIdentity

Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.0.50524.0&File=mscorlib.dll&Key=TypeInitialization_Type at Csla.Silverlight.Security.WindowsIdentity.get_Name()

at Business.AppPrincipal.<>c__DisplayClass3.<Login>b__2(Object o, DataPortalResult`1 e)

at Csla.DataPortal`1.OnFetchCompleted(DataPortalResult`1 e)

at Csla.DataPortal`1.proxy_FetchCompleted(Object sender, DataPortalResult`1 e)

at Csla.DataPortalClient.WcfProxy`1.OnFetchCompleted(DataPortalResult`1 e)

at Csla.DataPortalClient.WcfProxy`1.proxy_FetchCompleted(Object sender, FetchCompletedEventArgs e)

---------------------------

There is also an InnerException of the following:

---------------------------

Can not register property Roles after containing type (WindowsIdentity) has been instantiated at Csla.Core.FieldManager.PropertyInfoManager.RegisterProperty[T](Type objectType, PropertyInfo`1 info)

at Csla.ReadOnlyBase`1.RegisterProperty[P](PropertyInfo`1 info)

at Csla.Silverlight.Security.WindowsIdentity..cctor()

---------------------------

Does anybody know what the issue here might be?

?? ReadOnlyList is Child of EditableRoot

SDM10012 — Mon, 30 Aug 2010 18:15:43 GMT

Since I am pulling my BO's from a legacy application where most of the CRUD functions operate, one of my business objects does not have responsibility for creating its children ( which are read-only).

However some of the attributes of the parent are editable ... so it is an Editable Root with a read only child collection ....

In trying to follow the published pattern ... the one I'm referencing now ( from the "code reduction with child objects") requires that the child collection inherit from BusinessListBase .... Have a NewList() method.

That's not the case here.

Any documentation / suggestions on how I might make this work using ReadOnlyListBase ??

Thanks,

Steve

Problem Iterating through DeletedList (protection level problem)

lee_b — Mon, 30 Aug 2010 01:24:50 GMT

Hi,

I have a data portal factory with a block of code

public object Update(BusinessBaseList ol)
{

foreach(BusinessBase o in ol.DeletedList)
{

Delete<Object>(o);

}

This used to work, but now I am getting errors around deletedlist that it "cannot be used in this context because the get accessor is inaccessible" and that "DeletedList is inaccessible due to its protection level"

In the previous CSLA version, it appears that the BusinessListBase.DeletedList was public, but now it is protected. However, there is strong evidence that the version of CSLA I upgraded from (4.0.0-100201 - a pre release version anyway) had been tampered with so I am not sure if my initial approach was valid to begin with.

With the latest version, what is the proper approach to iterating through a deletedlist and deleting the objects within it?

Thanks