(WorkFlow) System.InvalidOperationException – The property ‘Collection’ of ‘AddToCollection’ is not initialized

Posted: January 23, 2011 in WF4.0
Tags: , , ,

If your Activities OutArgument is something complex,say List<string> for eg,then you need to initialize it first & If you don’t do so,you will get an exception The property ‘Collection’ of ‘AddToCollection<String>’ is not initialized.

For assigning default value to the variable,you can use the assign activity & initialize it to New List(Of String).Though your language is C#,if you look at,you will understand that the initialization to variable is a VB expression ! It’s not a big deal to write an expression in VB ,still I wonder why is it so when the project is C# :)If you know the answer,please share  that in the comments section below 🙂

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