System.Windows.Forms.FolderBrowserDialog dialog = new System.Windows.Forms.FolderBrowserDialog();
            dialog.Description = "请选择文件夹";
            dialog.ShowNewFolderButton = true;  // 显示 新建文件夹 按钮
            dialog.SelectedPath = Environment.CurrentDirectory; // 设置 选择的路径 为 当前项目路径
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                // 判空
                if (string.IsNullOrEmpty(dialog.SelectedPath)) { MessageBox.Show(this, "文件夹路径不能为空", "温馨提示"); return; }
 
                textBox7.Text = dialog.SelectedPath;    // 获取 选择的 文件夹 路径
            }