相关疑难解决方法(0)

我有一个"保存"按钮,所以当用户点击时,它将保存xml文件(xml序列化).这里使用了savefiledialog,当我按下取消而不选择任何文件时出现"参数异常"并说"空路径名称不合法".我该如何处理这个例外？即使没有在savefiledialog中选择任何路径,我希望表单保持不变.非常感谢.

我的savefiledialog片段:

private void SaveButton_Click(object sender, RoutedEventArgs e)
{
        string savepath;
        SaveFileDialog DialogSave = new SaveFileDialog();
        // Default file extension
        DialogSave.DefaultExt = "txt";
        // Available file extensions
        DialogSave.Filter = "XML file (*.xml)|*.xml|All files (*.*)|*.*";
        // Adds a extension if the user does not
        DialogSave.AddExtension = true;
        // Restores the selected directory, next time
        DialogSave.RestoreDirectory = true;
        // Dialog title
        DialogSave.Title = "Where do you want to save the file?";
        // Startup directory
        DialogSave.InitialDirectory = @"C:/";
        DialogSave.ShowDialog();
        savepath = DialogSave.FileName;
        DialogSave.Dispose(); …