基于其他列表的列表排序 [英] List sort based on another list

问题描述

我有两个通用列表对象，其中一个包含ID和顺序，另一个则包含一堆ID，例如，第二个列表中的每个ID都具有对第一个列表的ID引用；

I have two generic list objects, in which one contains ids and ordering, and the other a bunch of ids with each id in the second list having an id reference to the first list, for example;

public class OptionType
{
    public int ID { get; set; }
    public int Ordering { get; set; }
}

public class Option
{
    public int ID { get; set; }
    public int Type_ID { get; set; }
}   

很明显，我可以通过对OptionType列表进行简单的排序

Obviously I can do a simple sort on a list of OptionTypes by doing

types_list.OrderBy(x => x.Ordering);

但是，问题是，我该如何利用对象上的"type_ID"来排序"options_list"，这与types_list的排序有关.就像这样(显然这是无效的-但希望您会明白这一点！)

Question is though, how could I go about ordering an 'options_list' by utilising the 'Type_ID' on the object which would relate to the ordering of the types_list. As in something like (obviously this isn't valid - but hopefully you will get the idea!)

options_list.OrderBy(x => x.Type_ID == types_list.OrderBy(e => e.Ordering));

推荐答案

您应该能够使用联接来产生所需的输出.使用查询语法的示例.

You should be able to use a join to produce your desired output. Example using query syntax.

var orderedOptions = from option in options_list
                     join type in types_list
                     on option.Type_ID equals type.ID
                     orderby type.Ordering
                     select option;

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