System.Collections.Generic.IEnumable’不包含“ ToList”的任何定义

这就是问题所在。我正在从 ViewPage 获取 IEnumable，当我尝试转换 List 时，它显示了如下错误:

“ System.Collections.Generic.IEnumerable<Pax_Detail>”不包含 “ ToList”的定义，没有扩展方法“ ToList”接受 类型的第一个参数 可以找到“ System.Collections.Generic.IEnumerable<Pax_Detail>” (是否缺少 using 指令或汇编引用?)

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();
}

我已经在另一个控制器上应用了相同的逻辑。而且效果很好。我不知道有什么问题。我已经清理，重建项目，并重新启动我的笔记本电脑(虽然它是必要的)。

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最佳答案

Are you missing a using directive for System.Linq?

https://learn.microsoft.com/en-us/dotnet/api/system.linq.enumerable.tolist

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You're missing a reference to System.Linq.

Add

using System.Linq

to get access to the ToList() function on the current code file.

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.Linq namespace.

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An alternative to adding LINQ would be to use this code instead:

List<Pax_Detail> paxList = new List<Pax_Detail>(pax);
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I was missing System.Data.Entity dll reference and problem was solved

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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.


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