在WPF中调用打开文件对话框

             // Create OpenFileDialog
             Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();

             // Set filter for file extension and default file extension
             dlg.DefaultExt = ".txt";
             dlg.Filter = "JPEG Files (*.jpeg)|*.jpeg|PNG Files (*.png)|*.png|JPG Files (*.jpg)|*.jpg|GIF Files (*.gif)|*.gif";

             // Display OpenFileDialog by calling ShowDialog method
             Nullable<bool> result = dlg.ShowDialog();

             // Get the selected file name and display in a TextBox
             if (result == true)
             {
                 // Open document
                 string filename = dlg.FileName;
                 this.txtPlace.Text = filename;
             }

Using Open File Dialog in WPF