Sharepoint Custom Activity for workflows : dependency property which is of type "Typed DataTable".

Question

Hi,

I m creating a sharepoint custom activity for workflows.
Can someone please tell me if it is feasible to create a dependency property which is of type "Typed DataTable"?


I have created a property as:

public static DependencyProperty DtProperty = DependencyProperty.Register("DtProperty", typeof(TypedDataTable.DataTable), typeof(Activity.OperationActivity));

[DesignerSerializationVisibilityAttribute(DesignerSerializationVisibility.Visible)]

[BrowsableAttribute(true)]

[CategoryAttribute("Misc")]

public TypedDataTable.DataTable dt1
{

get

{

return ((TypedDataTable.DataTable)(base.GetValue(Activity.OperationActivity.DtProperty )));

}

set

{

base.SetValue(Activity.OperationActivity.DtProperty  value);

}

}


It gives me below error message:
Could not create activity of type 'Activity.OperationActivity'. System.ArgumentException: Type 'Activity.OperationActivity' does not define a static dependency property with name 'DtPropertyProperty'.
Parameter name: ownerType
   at System.Workflow.ComponentModel.DependencyProperty.ValidateAndRegister(String name, Type propertyType, Type ownerType, PropertyMetadata defaultMetadata, Type validatorType, Boolean isRegistered)
   at System.Workflow.ComponentModel.DependencyProperty.Register(String name, Type propertyType, Type ownerType)
   at Activity.OperationActivity..cctor()


Any help on this??

Answer 1

Moving to the workflow forums

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Answer 2

 Hi,

The correct code should be:

public static DependencyProperty DtProperty = DependencyProperty.Register("dt1", typeof(TypedDataTable.DataTable), typeof(Activity.OperationActivity));
......
public TypedDataTable.DataTable dt1
{
......
}

the 1st parameter of Register method must be a correct valid property name, and the 2nd parameter is the type of that property.

And I must remind you, if you want to use this property in SharePoint workflow, please ensure TypedDataTable.DataTable can be serialize.

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