Dynamics Community Forum Thread Details

Can AsyncCodeActivity base class be used instead of CodeActivity base class in a custom workflow activity? Getting errors when trying to register the CW (missing types)

Derived from AsyncCodeActivity:

    public abstract class AsyncTaskCodeActivity<T> : AsyncCodeActivity<T>
    {
        protected sealed override IAsyncResult BeginExecute(AsyncCodeActivityContext context, AsyncCallback callback, object state)
        {
            var task = ExecuteAsync(context);
            var tcs = new TaskCompletionSource<T>(state);
            task.ContinueWith(t =>
            {
                if (t.IsFaulted)
                    tcs.TrySetException(t.Exception.InnerExceptions);
                else if (t.IsCanceled)
                    tcs.TrySetCanceled();
                else
                    tcs.TrySetResult(t.Result);

                if (callback != null)
                    callback(tcs.Task);
            });

            return tcs.Task;
        }

        protected sealed override T EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
        {
            var task = (Task<T>)result;
            try
            {
                return task.Result;
            }
            catch (AggregateException ex)
            {
                ExceptionDispatchInfo.Capture(ex.InnerException).Throw();
                throw;
            }
        }

        protected abstract Task<T> ExecuteAsync(AsyncCodeActivityContext context);
    }

Example class to use the above:

public sealed class MyActivity : AsyncTaskCodeActivity<int>
{
    protected override async Task<int> ExecuteAsync(AsyncCodeActivityContext context)
    {
        await Task.Delay(100);
        return 13;
    }
}

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