[FAQ] WinForms Dialog Closes Immediately When Registered as an io.Connect Flyer Window

io.Connect Desktop
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1

Problem

A WinForms view is opened as a modal dialog with Form.ShowDialog(IWin32Window owner). After the dialog is shown, it is registered as an io.Connect flyer window with:

Task<IGlueWindow> RegisterWindow(IntPtr handle, GlueWindowOptions options = null, object contextCookie = null)

Instead of staying open, the dialog flickers and closes itself with DialogResult.Cancel, even though the user didn’t interact with it.

Cause

The dialog is first shown as a normal modal dialog via ShowDialog(). RegisterWindow() is then called on the already-open dialog to turn it into a flyer window, and the dialog closes at that point.

Solution

Don’t register a dialog that is already open via ShowDialog(). Show the dialog through the dialog methods on IGlueWindow instead:

Task<T> ShowDialogAsync<T>(IntPtr handle, Func<T> showDialogImpl, GlueDialogOptions options = null);
Task<bool?> ShowWindowDialogAsync<T>(Func<T> windowDialog, GlueDialogOptions options = null) where T : Window;
Task<DialogResult> ShowFormDialogAsync<T>(Func<T> windowDialog, GlueDialogOptions options = null) where T : Form;
bool? ShowDialog(Window window, GlueDialogOptions options = null);
DialogResult ShowDialog(Form form, GlueDialogOptions options = null);

For WinForms, use ShowFormDialogAsync or ShowDialog(Form, GlueDialogOptions).

Example:

if (glueWindow_.ShowDialog(new Form
    {
        Text = "You sure you want to do this?"
    }) == System.Windows.Forms.DialogResult.Cancel)
{
    return;
}

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