c# - Call Async Method in Page_Load

Question

static async void SendTweetWithSinglePicture(string message, string image)
{
    var auth = new SingleUserAuthorizer
    {
        CredentialStore = new SingleUserInMemoryCredentialStore
        {
            ConsumerKey = "",
            ConsumerSecret = "",
            AccessToken = "",
            AccessTokenSecret = ""
        }
    };

    var context = new TwitterContext(auth);

    var uploadedMedia = await context.UploadMediaAsync(File.ReadAllBytes(@image));
    var mediaIds = new List<ulong> { uploadedMedia.MediaID };

    await context.TweetAsync(
        message,
        mediaIds
    );
}
protected void Page_Load(object sender, EventArgs e)
{
    SendTweetWithSinglePicture("test", "path");
}

How can I call a async method on Page_Load?

Answer 1

The question is if you want to make the Page_Load method async or not. If so:

protected async void Page_Load(object sender, EventArgs e)
{
    await SendTweetWithSinglePicture("test", "path");
}

Or if you don't want it to be async:

protected void Page_Load(object sender, EventArgs e)
{
    SendTweetWithSinglePicture("test", "path").Wait();
}

This does require your async method to return Task as it always should! (except event handlers)

The problem with this might be that the method doesn't complete before rendering the page. If it has to, you'd better make the method synchronous, or register the task using Page.RegisterAsyncTask and Page.ExecuteRegisteredAsyncTasks. Effectively this will freeze the Page_Load method too.

protected void Page_Load(object sender, EventArgs e)
{
    PageAsyncTask t = new PageAsyncTask(SendTweetWithSinglePicture("test", "path"));

    // Register the asynchronous task.
    Page.RegisterAsyncTask(t);

    // Execute the register asynchronous task.
    Page.ExecuteRegisteredAsyncTasks();
}