Snippet of System.Threading.Tasks.TaskHelpers used in Web Api formatters to RunSynchronously

TaskHelpers

    internal static Task<TResult> RunSynchronously<TResult>(Func<TResult> func, CancellationToken cancellationToken = default(CancellationToken))
    {
        if (cancellationToken.IsCancellationRequested)
        {
            return Canceled<TResult>();
        }

        try
        {
            return FromResult(func());
        }
        catch (Exception e)
        {
            return FromError<TResult>(e);
        }
    }
    
    internal static Task<TResult> FromResult<TResult>(TResult result)
    {
        TaskCompletionSource<TResult> tcs = new TaskCompletionSource<TResult>();
        tcs.SetResult(result);
        return tcs.Task;
    }