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