Question

Code first. This is what I’m trying to do. I’m close, but I think I just need to fix the way I’ve defined my parameter in the UpdateButton method.

private async void UpdateButton(Action<bool> post)
{
    if (!await post())
        ErrorBox.Text = "Error posting message.";
}

private void PostToTwitter()
{
    UpdateButton(async () => await new TwitterAction().Post("Hello, world!"));
}

private void PostToFacebook()
{
    UpdateButton(async () => await new FacebookAction().Post("Hello, world!"));
}

Unfortunately, the !await post() doesn’t work because, “Type ‘void’ is not awaitable.” So the question is, how do I define my parameter in this method to support an awaitable parameter?

Here’s how the TwitterAction().Post() is defined…

public virtual async Task<bool> Post(string messageId){...}

Answer 1

private async void UpdateButton(Func<Task<bool>> post)
{
    if (!await post())
        ErrorBox.Text = "Error posting message.";
}

–EDIT–

UpdateButton(()=>Post("ss"));

private async void UpdateButton(Func<Task<bool>> post)
{
    if (!await post())
        this.Text = "Error posting message.";
}

public virtual async Task<bool> Post(string messageId)
{
    return await Task.Factory.StartNew(() => true);
}