将DataTable 导出为csv

//测试用的 导出查询的DataTable 
public static void Export(DataTable dtResult)
        {
             string strHeader =null;
            string LogName=@"d:\code\tableLog.csv";
            for (int i = 0; i < dtResult.Columns.Count; i++)
            {
              strHeader += dtResult.Columns[i].ColumnName + ",";
            }
            strHeader= strHeader.Substring(0, strHeader.Length - 1)+"\r\n";
            File.AppendAllText(LogName, strHeader);
            for (int i = 0; i < dtResult.Rows.Count; i++)
            {
                strHeader = null;
                for (int j = 0; j< dtResult.Columns.Count; j++)
                {
                    strHeader += dtResult.Rows[i][j]+ ",";
                }
                strHeader = strHeader.Substring(0, strHeader.Length - 1) + "\r\n";
                File.AppendAllText(LogName, strHeader);
            }
        }

strHeader 最好改为 StringBuilder 。