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<Type Name="SubscribeContextCallback" FullName="System.Activities.Presentation.SubscribeContextCallback">
<TypeSignature Language="C#" Value="public delegate void SubscribeContextCallback(ContextItem item);" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed SubscribeContextCallback extends System.MulticastDelegate" />
<TypeSignature Language="DocId" Value="T:System.Activities.Presentation.SubscribeContextCallback" />
<TypeSignature Language="VB.NET" Value="Public Delegate Sub SubscribeContextCallback(item As ContextItem)" />
<TypeSignature Language="C++ CLI" Value="public delegate void SubscribeContextCallback(ContextItem ^ item);" />
<TypeSignature Language="F#" Value="type SubscribeContextCallback = delegate of ContextItem -&gt; unit" />
<Parameter Name="item" Type="System.Activities.Presentation.ContextItem" />
<param name="item">The context item that changed.</param>
<summary>Defines a callback method that will be invoked when a context item changes.</summary>
<format type="text/markdown"><![CDATA[
## Remarks
This callback provides a mechanism for interested parties in both the host and the workflow designer to subscribe to updates to a <xref:System.Activities.Presentation.ContextItem> published to the editing context of the workflow designer.
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