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System.ComponentModel and distributed applications

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :WPF		 

Hi!

I've just been told about how good .NET is with a broker model for distributed applications. However, I haven't found anything, only a couple of sentences about the component model and how objects can be called from different processes and possibly network places.

So, is this it? I haven't seen any books or articles about System.ComponentModel and the objects therein.

Does anybody have any ideas of how to learn to work with System.ComponentModel?

Lots of Greetings!

Volker


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[System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Insert, true)]
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        Northwind.tbl_zaposleniRow product = products.Newtbl_zaposleniRow();

        product.ID = Id;



        if (Priimek == null) product.SetPriimekNull(); else product.Priimek = Priimek.Value;
        
        
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Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0117: 'string' does not contain a definition for 'Value'

Source Error:


 
Line 92: 
Line 93: 
Line 94:         i
 Using Reflection to get System.ComponentModel.DisplayName or Description 
  
I have a class and on the properties I have assigned the attributes System.ComponentModel.DisplayName and System.ComponentModel.Description.  Using reflection I can't seem to retrieve these attribute values.  How can I do this?
 System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary Error 
  
I have a WCF service that is using the SharePoint object model to query a list.  (I need my recurrence events.)

I have a Silverlight application referencing that service to display it using a datagrid.

Without referencing the sharepoint object model, everything works fine (test data).  Once I start using the SPsite, SPweb, I receive:
--------------------------------------------------------
Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30618)
Timestamp: Mon, 21 Sep 2009 01:29:39 UTC
Message: Unhandled Error in Silverlight Application An exception occurred during the operation, making the result invalid.  Check InnerException for exception details.   at System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
   at CalendarSVCApplication.TestDataRef.GetTestDataCompletedEventArgs.get_Result()
   at CalendarSVCApplication.MainPage.AnonymousMethod1(Object s, GetTestDataCompletedEventArgs args)
   at CalendarSVCApplication.MainPage._Lambda$__1(Object s, GetTestDataCompletedEventArgs args)
   at CalendarSVCApplication.TestDataRef.TestData1Client.OnGetTestDataCompleted(Object state)
Line: 1
Char: 1
Code: 0
URI: http:/
 System.ComponentModel.PropertyChangedEventHandler not handling the event 
  
Hi,


I'm working in a wpf app that is binding controls to a class that implements INotifyPropertyChanged. I'm trying to track when there are changes to the underlying object by setting a flag whenever a property is changed. To do so, I wired up an event handler
 to the PropertyChanged event of the class like so:




_facilityLogic.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(facilityLogic_PropertyChanged);

...

public void facilityLogic_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
  SetIsChanged();
}


Can anyone tell me why this event handler never gets called? The event is firing, but SetIsChanged() never gets called.


 The service 'System.Workflow.ComponentModel.Design.IMemberCreationService' must be installed for t 
  
I am getting this error








One or more 
errors encountered while loading the designer. The errors are listed below. Some 
errors can be fixed by rebuilding your project, while others may require code 
changes.






The service 
'System.Workflow.ComponentModel.Design.IMemberCreationService' must be installed 
for this operation to succeed. Ensure that this service is available. 

Hide    






at 
System.Workflow.ComponentModel.Design.NamePropertyDescriptor.SetValue(Object 
component, Object value)
at 
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeAssignStatement(IDesignerSerializationManager 
manager, CodeAssignStatement statement)
at 
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager 
m
 The service 'System.Workflow.ComponentModel.Design.IIdentifierCreationService' must be installed f 
  
 


I am trying to workthrough "Microsoft Workflow Foundation Tutorials".


 


I am creating workflow in VS 2008 by adding simple class with .vb extension and getting this error in designer view. 


"The service 'System.Workflow.ComponentModel.Design.IIdentifierCreationService' must be installed for this operation to succeed. Ensure that this service is available."


 


Please guide what to do?

 Should System.ComponentModel.Container() be used in a Custom Control 
  
I have developed a simple custom control which is effectively a custom button with a timer, derived from Control. I am unsure of using "components = new System.ComponentModel.Container()". Since the control uses a timer, should it be added to the components
 container? i.e. components.Add(timer); ? If so, how is it disposed, components.Dispose() is only called if Dispose(true) is called, which i dont? Or should i have a destructor ~MyComponent() which calls timer.Dispose().


In short, when do you use a "components = new Container()" and "components.Add()" in a custom control.


Also, if my control uses Graphics, Brush & Pen objects, should Dispose() be called on them and if so where. In the deconstructor? Or do you leave it up to the garbage collector?


Thanks.

 Distributed applications with databases communicating with each other, is this possible? 
  
I have a web application which has a resource hungry module. I am planning to take the module out as a separate application. 


Main Application (with database A, on host A) will connect to Module B (with database B, on host B) . With data sent from Application, Module will read Database B and start working. When data has been processed, it will be returned to database A.


Is this even possible? If yes, what is the best way to do this? Set Module B as a web service?


Thanks







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