How to await an event click [duplicate]

Answer 1

To await something, it needs to be a Task (this is an oversimplification, but that's the important part) _{(C# can await any object that exposes a TaskAwaiter GetAwaiter() method, but 95% of the time C# developers will be consuming Task/Task objects).}.

To create a Task you use TaskCompletionSource. This is how you can create a Task representation around other conceptual "tasks", like the IAsyncResult-style APIs, threads, overlapped IO, and so on.

Assuming this is WinForms, then do this:

class MyForm : Form
{
    // Note that `TaskCompletionSource` must have a generic-type argument.
    // If you don't care about the result then use a dummy null `Object` or 1-byte `Boolean` value.
    private TaskCompletionSource tcs;

    private readonly Button button;

    public MyForm()
    {
        this.button = new Button() { Text = "Click me" };
        this.Controls.Add( this.button );
        this.button.Click += this.OnButtonClicked;
    }

    private void OnButtonClicked( Object sender, EventArgs e )
    {
        if( this.tcs == null ) return;

        this.tcs.SetResult( (Button)sender );
    }

    internal async Task BatchLogicAsync()
    {
        this.tcs = new TaskCompletionSource();

        ProgressMessage = "Batch Logic Starts";

        Button clickedButton = await this.tcs.Task;

        ProgressMessage = "Batch Logic Ends";
    }
}