public class DataHelper
{
const string DEFSTR = "";
/// <summary>
/// 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
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
static T GetDefault<T>()
{
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;
}
/// <summary>
/// 获取一个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];
}
}//如果不存在这一列
catch (ArgumentException ex)
{
return GetDefault<T>();
}
}
}
{
const string DEFSTR = "";
/// <summary>
/// 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
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
static T GetDefault<T>()
{
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;
}
/// <summary>
/// 获取一个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];
}
}//如果不存在这一列
catch (ArgumentException ex)
{
return GetDefault<T>();
}
}
}