C#將DataTable數據導出CSV文件

C#將DataTable數據導出CSV文件通用方法！

//導出按鈕調用導出方法
    protected void btnCSV_Click(object sender, EventArgs e)
    {
        DataTable dt = ExportData();//獲取datatable數據源
        string title = "RPT_RC_BILLING_2020_LEOPARD_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".CSV";//導出的文件名
        EstablishCSV(dt,title);//將dt數據源和文件名title代入導出方法中
    }

 1 /// 將DataTable中數據寫入到CSV文件中
 2     /// </summary>
 3     /// <param name="dt">提供保存數據的DataTable</param>
 4     /// <param name="fileName">CSV的文件名</param>
 5     private void EstablishCSV(DataTable dt,string fileName)
 6     {
 7         HttpContext.Current.Response.Clear();
 8         System.IO.StringWriter sw = new System.IO.StringWriter();
 9         int iColCount = dt.Columns.Count;
10         for (int i = 0; i < iColCount; i++)//表頭
11         {
12             sw.Write("\"" + dt.Columns[i] + "\"");
13             if (i < iColCount - 1)
14             {
15                 sw.Write(",");
16             }
17         }
18         sw.Write(sw.NewLine);
19         foreach (DataRow dr in dt.Rows)//行內數據
20         {
21             for (int i = 0; i < iColCount; i++)
22             {
23                 if (!Convert.IsDBNull(dr[i]))
24                     sw.Write("\"" + dr[i].ToString() + "\"");
25                 else
26                     sw.Write("\"\"");
27                 if (i < iColCount - 1)
28                 {
29                     sw.Write(",");
30                 }
31             }
32             sw.Write(sw.NewLine);
33         }
34         sw.Close();
35         HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename="+ fileName);
36         HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
37         HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
38         HttpContext.Current.Response.Write(sw);
39         HttpContext.Current.Response.End();
40     }