public class DataHelper
??? {

??????? const string DEFSTR = "";
??????? /// <summary>
??????? /// 根據一個類型，獲取其默認值，數字默認是為0，字符串默認值為一個空字符串
??????? /// </summary>
??????? /// <typeparam name="T"></typeparam>
??????? /// <returns></returns>
??????? static T GetDefault<T>()
??????? {
??????????? T t = default(T);
??????????? //如果是字符串類型，則返回一個空字符串
??????????? if (DEFSTR is T)
??????????? {
??????????????? return (T)((object)DEFSTR);
??????????? }
??????????? return t;
??????? }

??????? /// <summary>
??????? /// 獲取一個DataRow某列的值
??????? /// </summary>
??????? /// <typeparam name="T"></typeparam>
??????? /// <param name="dr"></param>
??????? /// <param name="name"></param>
??????? /// <returns></returns>
??????? public static T GetValue<T>(DataRow dr, string name)
??????? {
??????????? try
??????????? {
??????????????? if (dr[name] == DBNull.Value)
??????????????? {
??????????????????? return GetDefault<T>();
??????????????? }
??????????????? else
??????????????? {
??????????????????? return (T)dr[name];
??????????????? }
??????????? }//如果不存在這一列
??????????? catch (ArgumentException ex)
??????????? {
??????????????? return GetDefault<T>();
??????????? }
??????? }
??? }

轉載于:https://www.cnblogs.com/mxw09/archive/2011/04/12/2013334.html

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