对一个列表进行另一个排序 [英] Sort one list by another

问题描述

我有2个列表对象，一个只是一个整数列表，另一个是一个对象列表，但是这些对象具有ID属性.

I have 2 list objects, one is just a list of ints, the other is a list of objects but the objects has an ID property.

我想要做的是按照其ID与整数列表相同的排序顺序对对象列表进行排序.

What i want to do is sort the list of objects by its ID in the same sort order as the list of ints.

我已经玩了一段时间了，现在想让它正常工作，

Ive been playing around for a while now trying to get it working, so far no joy,

这是我到目前为止所拥有的...

Here is what i have so far...

//**************************
//*** Randomize the list ***
//**************************
if (Session["SearchResultsOrder"] != null)
{
    // save the session as a int list
    List<int> IDList = new List<int>((List<int>)Session["SearchResultsOrder"]);
    // the saved list session exists, make sure the list is orded by this
    foreach(var i in IDList)
    {
        SearchData.ReturnedSearchedMembers.OrderBy(x => x.ID == i);
    }
}
else
{
    // before any sorts randomize the results - this mixes it up a bit as before it would order the results by member registration date                        
    List<Member> RandomList = new List<Member>(SearchData.ReturnedSearchedMembers);
    SearchData.ReturnedSearchedMembers = GloballyAvailableMethods.RandomizeGenericList<Member>(RandomList, RandomList.Count).ToList();

    // save the order of these results so they can be restored back during postback
    List<int> SearchResultsOrder = new List<int>();
    SearchData.ReturnedSearchedMembers.ForEach(x => SearchResultsOrder.Add(x.ID));
    Session["SearchResultsOrder"] = SearchResultsOrder;
}   

整个过程就是这样，当用户搜索成员时，最初它们会以随机顺序显示，然后，如果他们单击页面2，它们将保持该顺序，并显示接下来的20个结果.

The whole point of this is so when a user searches for members, initially they display in a random order, then if they click page 2, they remain in that order and the next 20 results display.

我一直在阅读有关我可以在Linq.OrderBy子句中用作参数的ICompare的信息，但是我找不到任何简单的示例.

I have been reading about the ICompare i can use as a parameter in the Linq.OrderBy clause, but i can’t find any simple examples.

我希望有一个优雅，非常简单的LINQ风格的解决方案，我总是可以希望.

I’m hoping for an elegant, very simple LINQ style solution, well I can always hope.

我们非常感谢您的帮助.

Any help is most appreciated.

推荐答案

另一种LINQ方法:

 var orderedByIDList = from i in ids 
                       join o in objectsWithIDs
                       on i equals o.ID
                       select o;

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