C# .NET List.Distinct
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.NET List.Distinct
提问by Nona Urbiz
I'm using .NET 3.5. Why am I still be getting:
我正在使用 .NET 3.5。为什么我仍然得到：
does not contain a definition for 'Distinct'
不包含“Distinct”的定义
with this code:
使用此代码：
using System.Collections.Generic;
//.. . . . . code
List<string> Words = new List<string>();
// many strings added here . . .
Words = Words.Distinct().ToList();
采纳答案by R. Martinho Fernandes
Are you
你是
using System.Linq;
?
?
Distinctis an extension method defined in System.Linq.Enumerableso you need to add that using statement.
Distinct是定义的扩展方法，System.Linq.Enumerable因此您需要添加该 using 语句。
And don't forget to add a reference to System.Core.dll(if you're using VS2008, this has already been done for you).
并且不要忘记添加对System.Core.dll（如果您使用的是 VS2008，这已经为您完成）。
回答by SLaks
You forgot to add
你忘了添加
using System.Linq;
Distinctis an extension methodthat is defined in System.Linq.Enumerable, so you can only call it if you import that namespace.
Distinct是在中定义的扩展方法System.Linq.Enumerable，因此只有在导入该命名空间时才能调用它。
You'll also need to add a reference to System.Core.dll.
If you created the project as a .Net 3.5 project, it will already be referenced; if you upgraded it from .Net 2 or 3, you'll have to add the reference yourself.
您还需要添加对System.Core.dll.
如果您将项目创建为 .Net 3.5 项目，它将已经被引用；如果您是从 .Net 2 或 3 升级的，则必须自己添加引用。
回答by mhhsyria
List<string> words = new List<string>();
// many strings added here . . .
IEnumerable <string> distinctword =Words .distinct();
foreach(string index in distinctword )
{
// do what u want here . . .
}
回答by daviesdoesit
From msdn blog: Charlie Calvert MSDN Blog Link
来自 msdn 博客：Charlie Calvert MSDN 博客链接
To use on .net fiddle: --project type: Console
在.net fiddle上使用：--project 类型：控制台
using System;
using System.Collections.Generic;
using System.Linq;
public class Program
{
public static void Main()
{
Console.WriteLine("Hello World");
var listA = new List<int> { 1, 2, 3, 3, 2, 1 };
var listB = listA.Distinct();
foreach (var item in listB)
{
Console.WriteLine(item);
}
}
}
// output: 1,2,3
