使用LINQ to创建两个不同的列表，其中的条目具有相同的属性对 [英] Using LINQ to create pairs from two different list where the entries have same attribute

问题描述

我请求的两个列表和响应谁从抽象继承 AbstractLineModel 类。无论是响应和请求中包含一个ID（或不）命名为的requestId 。

I have two lists of Requests and Responses who inherit from the abstract AbstractLineModel class. Both the responses and requests contain an ID (or not) named RequestId.

A CallPair 包含匹配对请求和的响应并具有以下构造：

A CallPair contains a matching pair of Request and a Response and has the following constructor:

public AbstractLineModel _request { get; set; }
public AbstractLineModel _response { get; set; }

public CallPair(AbstractLineModel request, AbstractLineModel response)
{
    _request = request;
    _response = response;
}

我想打一个列表 CallPairs 其中请求用相同的ID作为响应在 Callpair 匹配。如何匹配采购清单和响应？

I want to make a List of CallPairs where the Request with the same Id as the Response are matched in the Callpair. How to match the list of Requests and Responses?

我试过是：

public void MatchCallPairs()
{
    // Finds request that have matching response
    var requestWithMatches = _requests
        .Where(req => _responses.All(res => res.RequestId == req.RequestId)).ToList();

    // Match the request to the response
    foreach (var req in requestWithMatches)
    {
        var resp = _responses.Where(res => res.RequestId == req.RequestId).FirstOrDefault();

        // And create the pairs
        _callPairs.Add(new CallPair(req, resp));
    }
}

但这返回一个空列表。 _responses.All（RES => res.RequestId =

but this returns an empty list.

具体而言， VAR requestWithMatches = _requests
。凡（REQ => = req.RequestId））了ToList（）; 返回requestsWithMatches的空列表

Specifically, var requestWithMatches = _requests .Where(req => _responses.All(res => res.RequestId == req.RequestId)).ToList(); returns an empty list of requestsWithMatches.

有人可以帮我这个算法？

Can someone help me out with this algorithm?

推荐答案

刚加入的请求ID两个序列和加盟项目创建CallPair：

Just join both sequences on RequestId and create CallPair from joined items:

 var requestWithMatches = from req in _requests
                          join resp in _responses
                             on req.RequestId equals resp.RequestId
                          select new CallPair(req, resp);

这篇关于使用LINQ to创建两个不同的列表，其中的条目具有相同的属性对的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！