How can I do click Windows form MessageBox ok button

[maoyuan456]

When I test a pop up which type is ControlType.Window and acctually it's MessageBox from:

MessageBox.Show(message, caption,
                                 MessageBoxButtons.YesNo,
                                 MessageBoxIcon.Question);

Now I want press the Yes button, but cannot capture button yes and then I tried use enter kyboard as below code, tab input is works fine but enter input not working.

var AddRemoveFlagsForm = uiHelper.FindUIElement(null, "MessageBoxDialog");
var window = AddRemoveFlagsForm.AsWindow();
window.SetForeground();
TestingWait.ForSecond(5, "Wait for continue button");
Keyboard.Press(VirtualKeyShort.TAB);
TestingWait.ForSecond(5, "Wait for continue button");
Keyboard.Press(VirtualKeyShort.TAB);
TestingWait.ForSecond(5, "Wait for continue button");
Keyboard.Press(VirtualKeyShort.ENTER);

[kevinheyvaert]

And you cannot get the dialog with app.GetAllTopLevelWindows(_automation)[0] and then look for the yes button with first descendant with looking for Name/text of the button?

[Roemer]

Did you try @kevinheyvaert variant? Modal Windows are something very special and the should be fetched with the GetAllTopLevelWindows.

[Roemer]

I just tested various methods with RoslynPad. I tested with the keyboard and also with directly invoking the yes button. Both of them work.

#r "nuget:FlaUI.UIA3/2.0.0-rc1"
#r "nuget:FlaUI.Core/2.0.0-rc1"
#r "System.Windows.Forms"

using System.Diagnostics;
using System.Windows.Forms;
using FlaUI.Core;
using FlaUI.Core.AutomationElements;
using FlaUI.Core.Definitions;
using FlaUI.Core.Input;
using FlaUI.Core.WindowsAPI;
using FlaUI.UIA3;

var msg = Task.Factory.StartNew(() =>
{
    MessageBox.Show("test", "title", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
});

await Task.Factory.StartNew(() =>
{
    var automation = new UIA3Automation();
    var desk = automation.GetDesktop();
    var msg = desk.FindFirstChild(cf => cf.ByProcessId(Process.GetCurrentProcess().Id).And(cf.ByControlType(ControlType.Window)));
    // Variant 1 with Keyboard
    Thread.Sleep(1000);
    Keyboard.Press(VirtualKeyShort.TAB);
    Thread.Sleep(1000);
    Keyboard.Press(VirtualKeyShort.TAB);
    Thread.Sleep(1000);
    Keyboard.Press(VirtualKeyShort.ENTER);
    // Variant 2 with invoking the button
    var yesButton = msg.FindFirstChild(cf => cf.ByName("Ja")).AsButton();
    yesButton.Invoke();
});
await msg;

I consider this solved, otherwise feel free to re-open it.

[andyb1979]

The above worked, but a little sporadically (sometimes msg returned null) and required too many thread.sleeps.

A slight change in my code (I made the MessageBox window owner = Application.MainWindow) and I was now able to get the message box reliably like this:

var msg = WaitForElement(() => _mainWindow.ModalWindows.FirstOrDefault().AsWindow());
var yesButton = msg.FindFirstChild(cf => cf.ByName("OK")).AsButton();
yesButton.Invoke();

// Where WaitForElement is defined as 
public T WaitForElement<T>(Func<T> getter)
{
    var retry = Retry.WhileNull<T>(
        getter,
        TimeSpan.FromMilliseconds(BigWaitTimeout));

    if (!retry.Success)
    {
        Assert.Fail($"Failed to get an element within a {BigWaitTimeout}ms");
    }

    return retry.Result;
}