在WPF中调用另存为对话框

                 Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
                 dlg.FileName = "User.txt"; // Default file name
                 dlg.DefaultExt = ".txt"; // Default file extension
                 dlg.Filter = "Text documents (.txt)|*.txt"; // Filter files by extension

                 var dir = System.IO.Path.GetDirectoryName(this.txtPlace.Text);
                 dlg.InitialDirectory = dir;

                 // Show save file dialog box
                 Nullable<bool> result = dlg.ShowDialog();

                 // Process save file dialog box results
                 if (result == true)
                 {
                     // Save document
                     this.txtPlace.Text = dlg.FileName;
                 }

Using Save As Dialog in WPF