C# System.Collections.Generic.IEnumerable' 不包含 'ToList' 的任何定义
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System.Collections.Generic.IEnumerable' does not contain any definition for 'ToList'
提问by Dhwani
Here is the problem. I am getting IEnumerable from ViewPage and when I tried it to convert List it is showing me error like:
这是问题所在。我从 ViewPage 获取 IEnumerable，当我尝试将其转换为 List 时，它显示了如下错误：
'
System.Collections.Generic.IEnumerable<Pax_Detail>' does not contain a definition for 'ToList' and no extension method 'ToList' accepting a first argument of type 'System.Collections.Generic.IEnumerable<Pax_Detail>' could be found (are you missing a using directive or an assembly reference?)
“
System.Collections.Generic.IEnumerable<Pax_Detail>”不包含“ToList”的定义，并且找不到接受“System.Collections.Generic.IEnumerable<Pax_Detail>”类型的第一个参数的扩展方法“ToList” （您是否缺少 using 指令或程序集引用？）
Here is my controller code:
这是我的控制器代码：
[HttpPost]
public ActionResult Edit_Booking(Booking model, IEnumerable<Pax_Detail> pax)
{
List<Pax_Detail> paxList = new List<Pax_Detail>();
paxList = pax.ToList(); //getting error here
BookingDL.Update_Booking(model, paxList);
return View();
}
I have applied same logic on another controller. And it is working fine. I don't know what problem it has. I have already clean, rebuild project and also restarted my laptop(though it was needed).
我在另一个控制器上应用了相同的逻辑。它工作正常。我不知道它有什么问题。我已经清理，重建项目并重新启动了我的笔记本电脑（尽管需要）。
采纳答案by Anthony Sottile
Are you missing a using directive for System.Linq?
您是否缺少 using 指令System.Linq？
回答by Adrian Godong
You're missing a reference to System.Linq.
您缺少对 System.Linq 的引用。
Add
添加
using System.Linq
to get access to the ToList() function on the current code file.
访问当前代码文件上的 ToList() 函数。
To give a little bit of information over why this is necessary, Enumerable.ToList<TSource>is an extension method. Extension methods are defined outside the original class that it targets. In this case, the extension method is defined on System.Linqnamespace.
提供一些关于为什么需要这样做的信息，Enumerable.ToList<TSource>是一种扩展方法。扩展方法是在它所针对的原始类之外定义的。在这种情况下，扩展方法是在System.Linq命名空间上定义的。
回答by Daniel Hilgarth
An alternative to adding LINQ would be to use this code instead:
添加 LINQ 的另一种方法是使用以下代码：
List<Pax_Detail> paxList = new List<Pax_Detail>(pax);
回答by Denis Besic
I was missing System.Data.Entity dll reference and problem was solved
我缺少 System.Data.Entity dll 引用，问题已解决
回答by Myke Black
In my case, I had copied some code from another project that was using Automapper - took me ages to work that one out. Just had to add automapper nuget package to project.
就我而言，我从另一个使用 Automapper 的项目中复制了一些代码——我花了很长时间才弄明白。只需将 automapper nuget 包添加到项目中。
