c# 导出csv

  public void ExportToSvc(System.Data.DataTable dt, string strName)
        {
            string strPath = strName;
            if (File.Exists(strPath))
            {
                File.Delete(strPath);
            }
            //先打印标头
            StringBuilder strColu = new StringBuilder();
            StringBuilder strValue = new StringBuilder();
            int i = 0;
            try
            {
                StreamWriter sw = new StreamWriter(new FileStream(strPath, FileMode.CreateNew), Encoding.GetEncoding("GB2312"));
                for (i = 0; i <= dt.Columns.Count - 1; i++)
                {
                    strColu.Append(dt.Columns[i].ColumnName);
                    strColu.Append(",");
                }
                strColu.Remove(strColu.Length - 1, 1);//移出掉最后一个,字符
                sw.WriteLine(strColu);

                foreach (DataRow dr in dt.Rows)
                {
                    strValue.Remove(0, strValue.Length);//移出
                    for (i = 0; i <= dt.Columns.Count - 1; i++)
                    {
                        strValue.Append(dr[i].ToString().Replace(",", ";"));
                        strValue.Append(",");
                    }
                    strValue.Remove(strValue.Length - 1, 1);//移出掉最后一个,字符
                    sw.WriteLine(strValue);
                }
                sw.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            //System.Diagnostics.Process.Start(strPath);
        }