I am trying to make SaveFileDialog
and FileOpenDialog
enforce an extension to the file name entered by the user. I've tried using the sample proposed in question 389070 but it does not work as intended:
var dialog = new SaveFileDialog())
dialog.AddExtension = true;
dialog.DefaultExt = "foo";
dialog.Filter = "Foo Document (*.foo)|*.foo";
if (dialog.ShowDialog() == DialogResult.OK)
{
...
}
If the user types the text test
in a folder where a file test.xml
happens to exist, the dialog will suggest the name test.xml
(whereas I really only want to see *.foo
in the list). Worse: if the user selects test.xml
, then I will indeed get test.xml
as the output file name.
How can I make sure that SaveFileDialog
really only allows the user to select a *.foo
file? Or at least, that it replaces/adds the extension when the user clicks Save
?
The suggested solutions (implement the FileOk
event handler) only do part of the job, as I really would like to disable the Save
button if the file name has the wrong extension.
In order to stay in the dialog and update the file name displayed in the text box in the FileOk
handler, to reflect the new file name with the right extension, see the following related question.
You can handle the FileOk
event, and cancel it if it's not the correct extension
private saveFileDialog_FileOk(object sender, CancelEventArgs e)
{
if (!saveFileDialog.FileName.EndsWith(".foo"))
{
MessageBox.Show("Please select a filename with the '.foo' extension");
e.Cancel = true;
}
}