Map async result with automapper

Question

We are createing a Web.Api application of a angularjs application. The Web.Api returns a json result.

Step one was getting the data:

    public List

        

Answer 1

You can also add a couple of Task Extension Methods that will do this for you:

    public static Task Convert(this Task task)
    {
        if (task == null)
            throw new ArgumentNullException(nameof(task));

        var tcs = new TaskCompletionSource();

        task.ContinueWith(t => tcs.TrySetCanceled(), TaskContinuationOptions.OnlyOnCanceled);
        task.ContinueWith(t =>
        {
            tcs.TrySetResult(Mapper.Map(t.Result));
        }, TaskContinuationOptions.OnlyOnRanToCompletion);
        task.ContinueWith(t => tcs.TrySetException(t.Exception), TaskContinuationOptions.OnlyOnFaulted);

        return tcs.Task;
    }


    public static Task> ConvertEach(this Task> task)
    {
        if (task == null)
            throw new ArgumentNullException(nameof(task));

        var tcs = new TaskCompletionSource>();

        task.ContinueWith(t => tcs.TrySetCanceled(), TaskContinuationOptions.OnlyOnCanceled);
        task.ContinueWith(t =>
        {
            tcs.TrySetResult(t.Result.Select(Mapper.Map).ToList());
        }, TaskContinuationOptions.OnlyOnRanToCompletion);
        task.ContinueWith(t => tcs.TrySetException(t.Exception), TaskContinuationOptions.OnlyOnFaulted);

        return tcs.Task;
    }