AsyncCodeActivity.BeginExecute Method
Definition
Important
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When implemented in a derived class and using the specified execution context, callback method, and user state, enqueues an asynchronous activity in a run-time workflow.
protected:
abstract IAsyncResult ^ BeginExecute(System::Activities::AsyncCodeActivityContext ^ context, AsyncCallback ^ callback, System::Object ^ state);protected abstract IAsyncResult BeginExecute (System.Activities.AsyncCodeActivityContext context, AsyncCallback callback, object state);abstract member BeginExecute : System.Activities.AsyncCodeActivityContext * AsyncCallback * obj -> IAsyncResultProtected MustOverride Function BeginExecute (context As AsyncCodeActivityContext, callback As AsyncCallback, state As Object) As IAsyncResultParameters
- context
- AsyncCodeActivityContext
Information that defines the execution environment for the AsyncCodeActivity.
- callback
- AsyncCallback
The method to be called after the asynchronous activity and completion notification have occurred.
- state
- Object
An object that saves variable information for an instance of an asynchronous activity.
Returns
The object that saves variable information for an instance of an asynchronous activity.
Examples
The following example shows how to override the BeginExecute method in a custom activity.
protected override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state)
{
string tempFileName = Path.GetTempFileName();
Console.WriteLine("Writing to file: " + tempFileName);
FileStream file = File.Open(tempFileName, FileMode.Create);
context.UserState = file;
byte[] bytes = UnicodeEncoding.Unicode.GetBytes("123456789");
return file.BeginWrite(bytes, 0, bytes.Length, callback, state);
}
