SaveFileDialog bug in WPF

Question

I'm using Microsoft.Win32.SaveFileDialog class to save my files. When I saved file, and minimize my app, I can't restore it back. It happens only after when used Microsoft.Win32.SaveFileDialog. Here is code:

Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
dlg.FileName = String.Format("{0} {1} {2}", ev["b"], ev["a"], ev["c"]);
dlg.DefaultExt = ".csv";
dlg.Filter = "Supported format (.csv)|*.csv";
Nullable<bool> result = dlg.ShowDialog();
if (result == true)
{
    string s = dlg.FileName;
    //other code
}

File saves successfully, but I don't know how to solve problem with minimizing. Does anybody knows what it could be?

Deprecative

What is behind //other code? – Innervate

Maybe wire up to the FileOK event and see you can catch an error there. Just a reach. – Constantinople

@aleksey.berezan Writing string to file. – Deprecative

Answer 1

WPF has all kinds of weird modality issues when you show dialogs without parent windows. I haven't seen this directly with the SaveFileDialog, but I have seen similar behavior with other dialogs. Try using the overload of .ShowDialog() where you pass in the parent window.

Chefoo

Try using the overload of .ShowDialog() where you pass in the parent window., could be, I had same issue and solution in WinForms – Innervate

Answer 2

I encountered also a strange modality problem with WPF and the Win32 SaveFileDialog / OpenFileDialog.

What happens:

• The modal state is violated / gets lost completely and the main window can be clicked while the OpenFileDialog is opened with ShowDialog()

When does it happen:

• There was a task running before the OpenFileDialog opens
• The debugger breaks into a breakpoint before running the task

Just create a simple WPF Application with a button click event:

    private void Button_Click(object sender, RoutedEventArgs e)
    { // <-- Breakpoint sits here

        Task.Run(() => {}).Wait();

        new Microsoft.Win32.OpenFileDialog().ShowDialog();
    }

Using the overloaded ShowDialog(Window owner) function solves this problem.

Pasta