文件对话框 - 获得目录

System.Windows.Forms.FolderBrowserDialog folderBrowserDialog = 

　　new System.Windows.Forms.FolderBrowserDialog();
System.Windows.Forms.DialogResult result = folderBrowserDialog.ShowDialog();

if (result == System.Windows.Forms.DialogResult.OK)
{
　　textBlock_input.Text = folderBrowserDialog.SelectedPath;
}