获取DataRow某列的值的封装

public class DataHelper

    {



        const string DEFSTR = "";

        ///

        /// 根据一个类型，获取其默认值，数字默认是为0，字符串默认值为一个空字符串

        ///

        ///

        ///

        static T GetDefault()

        {

            T t = default(T);

            //如果是字符串类型，则返回一个空字符串

            if (DEFSTR is T)

            {

                return (T)((object)DEFSTR);

            }

            return t;

        }



        ///

        /// 获取一个DataRow某列的值

        ///

        ///

        ///

        ///

        ///

        public static T GetValue(DataRow dr, string name)

        {

            try

            {

                if (dr[name] == DBNull.Value)

                {

                    return GetDefault();

                }

                else

                {

                    return (T)dr[name];

                }

            }//如果不存在这一列

            catch (ArgumentException ex)

            {

                return GetDefault();

            }

        }

    }