C# Wait until condition is true

Question

I am trying to write a code that executes when a condition is met. Currently, I am using while...loop, which I know is not very efficient. I am also looking at AutoResetEven

Answer 1

You can use thread waiting handler

private readonly System.Threading.EventWaitHandle waitHandle = new System.Threading.AutoResetEvent(false);
private void btnOk_Click(object sender, EventArgs e)
{
    // Do some work
    Task task = Task.Run(() => GreatBigMethod());
    string GreatBigMethod = await task;

    // Wait until condition is false
    waitHandle.WaitOne();
    Console.WriteLine("Excel is busy");
    waitHandle.Reset();

    // Do work
    Console.WriteLine("YAY");
 }

then some other job need to set your handler

void isExcelInteractive()
{
   /// Do your check
   waitHandle.Set()
}

Update: If you want use this solution, you have to call isExcelInteractive() continuously with specific interval:

var actions = new []{isExcelInteractive, () => Thread.Sleep(25)};
foreach (var action in actions)
{                                      
    action();
}