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C# 下將DataTable中的內容保存為txt文件源代碼實例

編輯：.NET實例教程

引用IO命名空間：using System.IO;

在頁面拖一個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("保存失敗！");
            }

}

private void WriteTxt(DataTable tb)
        {
            StreamWriter sr;

            string report;
            if (File.Exists(Application.StartupPath + "\\MyFile3.txt"))   //如果文件存在,則創建File.AppendText對象
            {
                sr = File.AppendText(Application.StartupPath + "\\MyFile3.txt");
                report = "appended";
            }

$False$

            else   //如果文件不存在,則創建File.CreateText對象
            {
                sr = File.CreateText(Application.StartupPath + "\\MyFile3.txt");
                report = "created";
            }
            StringBuilder sb = new StringBuilder();
            sr.WriteLine("注數\t紅1\t紅2\t紅3\t紅4\t紅5\t紅6\t藍1\t藍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");
            }
        }