_KillerCodes: Custom Workflow Activity to calculate and return

The following sample workflow activity demonstrates how to return a calculated value from an activity.

	using Microsoft.Crm.Workflow;
	using Microsoft.Crm.Sdk;
	using Microsoft.Crm.SdkTypeProxy;
	using Microsoft.Crm.Sdk.Query;

	namespace SampleWorkflows
	{
	[CrmWorkflowActivity("Return a Calculated Value")]
	public class AddActivity : Activity{
	protected override ActivityExecutionStatus Execute(ActivityExecutionContext executionContext){
	result = new CrmNumber(a.Value + b.Value);
	return base.Execute(executionContext);
	}

	public static DependencyProperty aProperty =
	DependencyProperty.Register("a", typeof(CrmNumber), typeof(AddActivity));

	[CrmInput("a")]
	public CrmNumber {
	get { return (CrmNumber)base.GetValue(aProperty); }
	set { base.SetValue(aProperty, value); }
	}

	public static DependencyProperty bProperty =
	DependencyProperty.Register("b",
	typeof(CrmNumber),
	typeof(AddActivity));

	[CrmInput("b")]
	public CrmNumber b {
	get{ return (CrmNumber)base.GetValue(bProperty);}
	set{ base.SetValue(bProperty, value); }
	}

	public static DependencyProperty resultProperty =
	DependencyProperty.Register("result", typeof(CrmNumber), typeof(AddActivity));

	[CrmOutput("result")]
	public CrmNumber result {
	get { return (CrmNumber)base.GetValue(resultProperty); }
	set { base.SetValue(resultProperty, value); }
	}
	}
	}

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