Using Generic Dictionaries Can Crash Debuging -- Understanding Why.

• 2007年10月4日 16:27

   

   
  

  0

  I posted this on GotSpeech.NET as well....

   

  This is not so much a problem as it is a question of not understanding what is happening behind the scenes.

  I instantiate a generic Dictionary and create a property to access it in the Main Workflow class like this...

  private Dictionary<string, object> session = new Dictionary<string, object>();

  public Dictionary<String, Object> Session
  {
  get { return session; }
  set { session = value; }
  }

  Then I assign a value to the dictionary in the Workflow constructor like this...

  Session.Add("InstitutionID", InstitutionID);
  
  and then when debuging, I get this error when I put a break point on a workflow activity....

   

  An error occurred while loading the workflow. Please correct the following error and try reloading the document to view the workflow.

   

  plus I get a link to the XOML that reads

   

  CreateInstance failed for type 'System.Collections.Generic.Dictionary '2'. Cannot create an instance of the System.Collections.Generic.Dictionary'2'[TKey,TValue] because Type.ContainsGenericParameters is true...

   

  If I run the code in NON debug mode or remove the break point everything runs fine.
  

  Also if I move the Session.Add code outside the constructor to for example a code activity, then debuger works as well.

  My questions is why?  Could someone shed some light on what is happening behind the scene?

   

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