/// <summary>
/// 获取单个表字段值
/// </summary>
/// <param name="tablename"></param>
/// <param name="columnName"></param>
/// <param name="strWhere"></param>
/// <returns></returns>
public object GetColumnValue(string tablename, string columnName, string strWhere)
{
return(dal.GetColumnValue(tablename, columnName, strWhere));
}