如何使用LINQ过滤Arraylist？ [英] How to Filtering Arraylist using LINQ?

问题描述

我们有如下所示的arraylist：

We have arraylist like below:

ArrayList list = new ArrayList();
list[0]=""mdmf4": {"min_price": 39.72,"trans": "Manual"}";
list[1]=""mdmf4": {"min_price": 40.72,"trans": "Manual"}";
list[2]=""mdmf5": {"min_price": 39.56,"trans": "Manual"}";
list[3]=""mdmf5": {"min_price": 22.44,"trans": "Manual"}";
list[4]=""maaf4": {"min_price": 71.82,"trans": "Manual"}";
list[5]=""maaf4": {"min_price": 39.00,"trans": "Manual"}";

我想以最低价格过滤aaraylist，结果如下：

I want to filter aaraylist with minimum price and result looks like :

list[0]=""mdmf4": {"min_price": 39.72,"trans": "Manual"}";
list[1]=""mdmf5": {"min_price": 22.44,"trans": "Manual"}";
list[2]=""maaf4": {"min_price": 39.00,"trans": "Manual"}";

如何不使用Loop？是否可以使用LINQ？

How to do without using Loop? Is it possible with LINQ?

推荐答案

首先：我无法理解您的列表。这应该是一个JSON样式对象吗？如果是这样，那就很糟糕了。

我将假设一个具有id和值的POCO这个例子。



你需要一个groupby关注一分钟：

First: I cannot make much sense of your list. Is that supposed to be a JSON style object? if so then it is badly formed.
I will assume a POCO with id and value for this example.

You need a groupby followed by a min:

var result = list
            .GroupBy(l=>l.id)
            .Select(g=>new {id=g.key,value = g.min(l=>l.value);

这将返回带有id和value的匿名类型。如果你需要，你可以选择一个新定义的POCO类型。

this will return an anon type with id and value. You can select a new defined POCO type if that's what you need.

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