AsyncCodeActivity.BeginExecute Method

Definition

Namespace:

System.Activities

Assembly:

System.Activities.dll

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 -> IAsyncResult

Protected MustOverride Function BeginExecute (context As AsyncCodeActivityContext, callback As AsyncCallback, state As Object) As IAsyncResult

Parameters

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

IAsyncResult

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);
}