使用 linq 查询对象数组 [英] Query an object array using linq

问题描述

我想知道如何查询对象数组.例如，我有一个像 CarList 这样的数组对象.所以 CarList[0] 会返回给我对象 Car.Car 具有 Model 和 Make 属性.现在，我想使用 linq 查询数组 CarList 以获取型号为bmw"的汽车的制造商.我尝试了以下

I would like to know how can I query an array of objects. For example I have an array object like CarList. So CarList[0] would return me the object Car. Car has properties Model and Make. Now, I want to use linq to query the array CarList to get the Make of a Car whose Model is say "bmw". I tried the following

var carMake = from item in CarList where item .Model == "bmw" select s.Make;

我收到错误

找不到源类型 CarList[] 的查询模式的实现

Could not find an implementation of the query pattern for source type CarList[]

我无法将 CarList 从数组更改为 List<> 之类的内容，因为 CarList 作为数组从网络服务返回给我.

I cannot change CarList from array to something like List<> since CarList is retured to me as array from a webservice.

请告诉我如何解决这个问题.如果你能用 C# 代码解释就好了.

Kindly let me know how this can be solved. Would be great if you can explain using C# code.

提前致谢.

推荐答案

添加:

using System.Linq;

到文件的顶部.

然后:

Car[] carList = ...
var carMake = 
    from item in carList
    where item.Model == "bmw" 
    select item.Make;

或者如果您更喜欢流畅的语法:

or if you prefer the fluent syntax:

var carMake = carList
    .Where(item => item.Model == "bmw")
    .Select(item => item.Make);

注意事项:

• 在 select 子句中使用 item.Make 代替如果 s.Make 在你的代码中.
• where 子句中的 item 和 .Model 之间有一个空格

• The usage of item.Make in the select clause instead if s.Make as in your code.
• You have a whitespace between item and .Model in your where clause

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