C# 下将DataTable中的内容保存为txt文件 源代码实例

引用IO命名空间：using System.IO;  

在页面拖一个saveFileDialog1控件;

 private void btnJgbc_Click(object sender, EventArgs e)
        {
            try
            {
                DataTable myDT = new DataTable();
                myDT = GvtoDT(ref myGV);
                WriteTxt(myDT);
                MessageBox.Show("保存成功！");
            }
            catch
            {
                MessageBox.Show("保存失败！");
            }

}

 private void WriteTxt(DataTable tb)
        {
            StreamWriter sr;
         
            string report;
            if (File.Exists(Application.StartupPath + "//MyFile3.txt"))   //如果文件存在,则创建File.AppendText对象  
            {
                sr = File.AppendText(Application.StartupPath + "//MyFile3.txt");
                report = "appended";
            }
            else   //如果文件不存在,则创建File.CreateText对象  
            {
                sr = File.CreateText(Application.StartupPath + "//MyFile3.txt");
                report = "created";
            }
            StringBuilder sb = new StringBuilder();
            sr.WriteLine("注数/t红1/t红2/t红3/t红4/t红5/t红6/t蓝1/t蓝2/r/n");
            foreach (DataRow dr in tb.Rows)
            {
                sr.WriteLine(dr[0].ToString() + "/t" + dr[1].ToString() + "/t" + dr[2].ToString() + "/t" + dr[3].ToString() + "/t" + dr[4].ToString() + "/t" + dr[5].ToString() + "/t" + dr[6].ToString() + "/t" + dr[7].ToString() + "/r/n");
       
            }
           sr.Close();
            if( saveFileDialog1.ShowDialog()==DialogResult.OK)
            {
                File.Copy(Application.StartupPath + "//MyFile3.txt", saveFileDialog1.FileName, true);
                File.Delete(Application.StartupPath + "//MyFile3.txt");
            }
        }