ITGoran blog

.NET, MEF, ASP .NET MVC, IoC, PowerShell, WCF, CSLA

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Migrate project from CSLA 3.7 to CSLA 4.0 (how to)

We’ve recently managed to migrate all our product lines from CSLA 3.7 to CSLA 4.0 and here are problem/solutions scenario.
  • Problem:
    Class contains backend field, but is not registered
    If you don’t do it, exception Csla.PropertyLoadException will be raised with message
  • Property load or set failed for property MyField (Properties with private backing fields must be marked as RelationshipTypes.PrivateField)
Solution:
Register backend field:
private int _my_field;
private static readonly PropertyInfo<int> MyFieldProperty = RegisterProperty<int>(o => o.MyField, "My field", RelationshipTypes.PrivateField);
public int MyField
{
       get { return GetProperty(MyFieldProperty, _my_field); }
       set { SetProperty(MyFieldProperty, ref _my_field, value); }
}
Problem:
Method LoadProperty was used like this:
LoadProperty(MyFieldProperty, 10);
exception Csla.PropertyLoadException will be raised with message Csla.PropertyLoadException: Property load or set failed for property MyField (Attempt to read/load private field property in managed properties.) —> System.InvalidOperationException: Attempt to read/load private field property in managed properties
In this case, you have to initialize backend field :
_my_field = 10;
  • Problem :
Class contains readonly field ,
private readonly int _my_field;
and you try to set the value using binding, runtime exception raised with message:
Expression must be writeable Parameter name: left
Solution:
Solution:

Make field static

private static readonly int _my_field;
  • Problem:
Class is inherited from base class :

[Serializable]
public class MyBaseClass<T> : BusinessBase<T> where T : MyBaseClass<T>
{
}

[Serializable]
public class MyConcreteClass : MyBaseClass<MyConcreteClass>
{
   protected static PropertyInfo<string> ConcretePropProperty = RegisterProperty(typeof(MyConcreteClass), new PropertyInfo<string>("ConcretePropProperty"));
   public string ConcreteProp
   {
      get { return GetProperty(ConcretePropProperty); }
      set { SetProperty(ConcretePropProperty, value); }
    }
}

and if properties in MyBaseClass are not registered exception raised with message:

The type initializer for ‘MyConcreteClass’ threw an exception.System.TypeInitializationException: The type initializer for ‘ MyConcreteClass’ threw an exception. —> System.InvalidOperationException: Cannot register property ConcretePropr after containing type (MyBaseClass) has been instantiated
Solution:
You have to register every property in concrete class.
  • Problem:

    Class is inherited from BusinessListBase or BusinessBindingListBase. Adding new items in collection cannot be done.

Solution:
All items that will be added to collection must be created like child.
Did you have issues and would you like to share with community ?

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CSLA 4, with support for .NET 4, Silverlight 4 and Visual Studio 2010 – released.

 

This is a major release of the CSLA .NET framework because of significant changes to CSLA itself based on feedback and input from the vibrant CSLA community.

You can download CSLA 4 here.

If this is you first contact with CSLA framework, you can read my previous post introduction to CSLA.

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The system cannot find the file specified – The server encountered an unexpected error and stopped. (FIM 2010) – solved.

When I was installing SharePoint 2010 i encounter an error from the title.
Log in EventLog was:

The server encountered an unexpected error and stopped.
“ERR: MMS(4828): libutils.cpp(10475): RegQueryValueEx of Server failed with 2
BAIL: MMS(4828): libutils.cpp(10477): 0x80070002 (The system cannot find the file specified.)
ERR: MMS(4828): libutils.cpp(10475): RegQueryValueEx of SQLInstance failed with 2
BAIL: MMS(4828): libutils.cpp(10477): 0x80070002 (The system cannot find the file specified.)
ERR: MMS(4828): libutils.cpp(10475): RegQueryValueEx of DBName failed with 2
BAIL: MMS(4828): libutils.cpp(10477): 0x80070002 (The system cannot find the file specified.)
BAIL: MMS(4828): server.cpp(281): 0x80070002 (The system cannot find the file specified.)
BAIL: MMS(4828): server.cpp(3518): 0x80070002 (The system cannot find the file specified.)
BAIL: MMS(4828): service.cpp(1528): 0x80070002 (The system cannot find the file specified.)

I spend hours trying to figure out what file missing. Well, solutions was quite different.

I added service account (account for window services Forefront Identity Manager Service and Forefront Identity Manger Synchronization Service)
into three groups on local machine:
FIMSyncOperator, FIMSyncJoiners and FIMSyncBrowse and errors gone.

Strange was also that when I installed SharePoint 2010, service account was /.

I change this to domain user account and that user added into three groups mention previously.

Hope that this will save you time.

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ASP .NET MVC – Where to start ?

Video material on ASP .NET MVC is good place to start.
I put links here for easy to find.

ASP .NET MVC 3.0 (Video)

Sample applications:

Did I missed some great link ?

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CSLA 4.0 Preview 4 available

CSLA framework 4.0 preview 4 available for download.

New framework 4.0 in general have break changes (here are some of them):
  – the new business and validation rules subsystem (this is covered in this post and here)
  – removed non-generic DataPortal methods.
  – CommandBase now implements IClonable, which means it works with automatic cloning when using a local data portal deployment. 
More on break changes you can read at Lhotka version 4.0.0 change log.
For highlights on CSLA 4 you can read here.

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What should a developer know before building a public web site?

 

This is one of the common question when you ask when starts with web development.
Well, you can see a lot of answers here and maybe find what are You looking for.

I did :)

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MIX10 Download Sessions – How to

 

In case You missed sessions in Mix10 you can use Mix10 Session Download to download all sessions. See details here.

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ASP.NET MVC 2 RTM Released

 

ASP.NET MVC 2 provides a new Model-View-Controller (MVC) framework on top of the existing ASP.NET 3.5 SP1 runtime and can be downloaded from here.
Source code available from here.
ASP .NET MVC code examples are published at MSDN and can be downloaded from here.

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CSLA .NET 3.8.2 released

 

Rockford Lhotka announces update to his CSLA application Framework.

This is a bug-fix release, and has been in beta for several months.

Can be downloaded here.

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CSLA – Factory methods (part II)

 

This is continued from my first CSLA tutorial post (introduction)

In this post we will see some of the basic steps to create new CSLA object using factory methods.

Factory methods are method that we use to create new instance of the type.

If this method have same name like type (class), that method is called constructor.

In CSLA framework, default constructors are declared as private, so the users of the class

(usually developer) is "forced" to call factory methods to make new instance.

We can create new object using different criteria, in some scenarios we need to create new instance using simple types like string, int etc…, and in some we have to use complex type like Company, Salary etc… For that purpose, we can use SingleCriteria class or make our custom criteria class.

So, let’s see some different scenarios :

 

  1. 1. In our first example we will create declare type Employee with default create method.

 

 
#region using.statements 
using Csla;
using System;
#endregion
namespace CslaTutorial.FactoryMethods 
{  
   [Serializable]
   public class Employee : BusinessBase<Employee>
  {
       #region Factory Methods
       public static Employee CreateEmployee()
       {    
           return DataPortal.Fetch<Employee>();
       }
      
       protected override void DataPortal_Create()
      { 
         // Add some initialization here. 
      }
       private Employee() { }
       #endregion
   }  
}    

2. Factory method with use of criteria (SingleCriteria).
I prefer to use this criteria class when I don’t have 2 criteria with same type.
(ie. CreateEmployee(int id), CreateEmployee(int internalIdentificationNumber).

   #region using.statements 
    using Csla;
    using System; 
   #endregion

   namespace CslaTutorial.FactoryMethods 
   { 
      [Serializable]
     public class Employee : BusinessBase<Employee>
    {
            #region Factory Methods
            // Create Employee with SingleCritera (csla class). 
           public static Employee CreateEmployee(Company company) 
          {  
              return DataPortal.Create<Employee>(new SingleCriteria<Employee, Company>(company));    
           }
           
           private void DataPortal_Create(SingleCriteria<Employee, Company> criteria)
           { 
              // this method will be called when CreateEmployee(Company company) is called. 
            }
            
            private Employee() { }
           #endregion
     }   
}   

3. Factory method with custom criteria class EmployeeIdNumberCriteria.

#region using.statements

using Csla;
using System;
#endregion

namespace CslaTutorial.FactoryMethods
{
    [Serializable]
    public class Employee : BusinessBase<Employee>
    {

        #region Factory Methods

        // Create Employee with custom criteria.
        public static Employee CreateEmployeeWithCustomCriteria(string employIdNumber)
        {
            return DataPortal.Create<Employee>(new EmployeeIdNumberCriteria(employIdNumber));
        }

        private void DataPortal_Create(EmployeeIdNumberCriteria criteria)
        {
            // this method will be called by CSLA when method CreateEmployeeWithCustomCriteria(string employIdNumber) is called.
        }

       [Serializable]
        private class EmployeeIdNumberCriteria
        {
            public string EmployIdNumber { get; private set; }

            public EmployeeIdNumberCriteria(string employIdNumber)
            {
                EmployIdNumber = employIdNumber;
            }
        }

        private Employee()
        {   }

        #endregion

    }
}

So, those are basics steps to declare and define factory methods which will be called by CSLA framework.