判断DataTale中判断某个字段中包含某个数据

 /// <summary>
        /// 判断DataTale中判断某个字段中包含某个数据
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="columnName"></param>
        /// <param name="fieldData"></param>
        /// <returns></returns>
        public Boolean IsColumnIncludeData(DataTable dt, String columnName, string fieldData)
        {
            if (dt == null)
            {
                return false;
            }
            else
            {
                DataRow[] dataRows = dt.Select(columnName + "='" + fieldData + "'");
                if (dataRows.Length.Equals(1))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }

        }