小弟书读的浅,没见过这种语法,哪位知道的麻烦讲解一下。
public static DateTime? StringTimeConvertDateTimeHasNull(string time, TimeFormatPatternType type)
{
if (string.IsNullOrEmpty(time))
return null;
return StringTimeConvertDateTime(time, type);
}
public static DateTime? StringTimeConvertDateTimeHasNull(string time, TimeFormatPatternType type)
{
if (string.IsNullOrEmpty(time))
return null;
return StringTimeConvertDateTime(time, type);
}
http://msdn.microsoft.com/zh-cn/library/1t3y8s4s(v=vs.80).aspx
DateTime? 就可以返回NULL了,可空类型