读取数据集前两列并写入到文本

      ...  ...
 
       /// <summary>
        /// 创建Txt文本
        /// </summary>
        /// <param name="name"></param>
        /// <param name="str"></param>
        public void CreateTxt(string name,string str)
        {
            using(StreamWriter sw=new StreamWriter(@"" + name + ".txt", false, Encoding.UTF8))
            {
                sw.WriteLine(str);
                sw.Close();
            }
        }
        /// <summary>
        /// 往指定的文档写数据
        /// </summary>
        /// <param name="path">存储文档的路径,示例: string path=@"F:\Template\"</param>
        /// <param name="saveTxtName">保存数据的文件名，示例: string saveTxtName=@"1"</param>
        public void WriteData(string path,string saveTxtName)
        {
            string val = string.Empty;
            if (dt.Rows.Count > 0)
            {
                //读取数据集的前两列
                DataTable data = dt.DefaultView.ToTable(false, new string[]
                {
                    dt.Columns[0].ToString(),
                    dt.Columns[1].ToString()
                });
                for(int i = 0; i < data.Rows.Count; i++)
                {
                    DataRow row = data.Rows[i];
                    val += row.ItemArray[0].ToString() + "\t" + row.ItemArray[0].ToString() + "/" + row.ItemArray[1].ToString() + "\r\n";
                }
                try
                {
                    //判断是否存在文件夹，无则创建
                    if (!Directory.Exists(path))
                    {
                        DirectoryInfo info = Directory.CreateDirectory(path);
                    }
                    CreateTxt(path + saveTxtName, val);//根据设定的路径、名称创建txt文档
                }
                catch(Exception)
                {
                    throw;
                }
            }
        }