C＃：自定义属性的排序列表
这个问题在这里已经有了答案：
这可能效率低下，但是您可以将DateTime属性添加到MyEvent类中，该类将StartDate转换为DateTime并对其进行排序：
public class MyEvent
{
public int EventId{get;set;}
public MyDate StartDate{get;set;}
public DateTime MyStartDate { get { return DateTime.Parse(StartDate.MMDDYYYYHHMMSS); } }
}
var sorted = myEvents.OrderByDescending(e => e.MyStartDate);
或者，您可以使类不可变，并在实例化时进行转换：
public class MyEvent
{
public MyEvent(int eventId, MyDate startDate)
{
EventId = eventId;
StartDate = startDate;
MyStartDate = DateTime.Parse(StartDate.MMDDYYYYHHMMSS);
}
public int EventId{get; private set;}
public MyDate StartDate{get; private set;}
public DateTime MyStartDate { get; private set; }
}
你可以按照你的需要用Linq OrderyBy()或OrderByDescending方法编写它：
var outputDate = myEvents.OrderByDescending(x=>
{
DateTime parsedDate;
return DateTime.TryParseExact(x.StartDate, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedDate) ? parsedDate : DateTime.MinValue;
});
或者正确的方法是为它创建一个自定义IComparer：
public class StringDateComparer : IComparer<string>
{
public int Compare(string date1, string date2)
{
DateTime parsedDate1;
DateTime.TryParseExact(date1, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedDate1);
DateTime parsedDate2;
DateTime.TryParseExact(date2, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture, DateTimeStyles.None, out parsedDate2);
if (parsedDate1 < parsedDate2)
return -1;
if (parsedDate1 > parsedDate2)
return 1;
return 0;
}
}
现在调用以IComparer对象为参数的OrderByDescending()重载：
var outputDate = myEvents.OrderByDescending(x=>x.StartDate,new StringDateComparer());