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When does Microsoft.Win32.OpenFileDialog.ShowDialog() return null?

OpenFileDialog's ShowDialog method returns a nullable boolean, set to true if the user clicked OK or false if he clicked Cancel. When does it return null? The documentation does not say.

Solution

  • This is stated in the questions linked below, but I'll mention here that Programming WPF (Chris Sells, Ian Griffiths) says:

    ShowDialog will always return true or false. ... Only after a dialog has been shown but before it's been closed is DialogResult null.

    Similar question: When would ShowDialog() return null?

    And: Why is DialogResult a nullable bool in WPF?