模型不包含定义错误 [英] Model does not contain a definition error

问题描述

全部好，



我在项目中遇到问题，并想知道是否有人可以指出我可能出错的地方。所以基本上在我的项目中我有一个像这样的ActionResult方法

HI All,

I am having an issue in my project and wonder if some can pinpoint me to where i may have gone wrong. so basically in my project i have got an ActionResult method like so

public ActionResult PartNumberManufacturer(string id)
        {

         var partNumber = _Context.PartNumberTable.FirstOrDefault(x => x.partNumberId == id);
            
           return PartialView("PartNumberView",    partNumber);
}

这是我的观点

Then this is my view

@if (Model != null && !string.IsNullOrEmpty(Model.PartNumberManufacturer))
{

                @if (Model.PartNumberManufacturer == "Fr")
                {

                    <div>

                        <p> This product is developed in france </p>
                    </div>


                }

@if (@Model.PartNumberManufacturer == "Ger")
            {



                    <p> This Product is developed in Germany </p>

                  </div>
            }

以上代码工作正常。但问题是，如果你回顾我的ActionResult控制器方法，我正在使用：

well the above code works fine. but the thing is that if you look back into my ActionResult controller method , i am using :

var partNumber = Context.PartNumberTable.FirstOrDefault(x => x.partNumberId == id);

FirstOrDefault-course只返回数据库中第一个找到的零件号。

这不是我想要的东西我不希望它只返回第一个找到的记录，我希望它返回数据库中搜索查询匹配的所有记录。所以为了做到这一点并在网上进行了一些研究之后，我发现我必须将结果返回到列表中，这使我修改了我的ActionResult方法，如下所示：

FirstOrDefault of-course will only return the first found part number in the database.
This isnot what i am looking for i don't want it only to return the first found record , i want it to return all the records that match by the search query in the database. So in order to do and after a few research online i found that i had to return the results into a list and this made me amend my ActionResult method to like this:

public ActionResult PartNumberManufacturer(string id)
        {
 
 var _methodOfRepair = Context.PartNumberTable.Where(x => x.PartNumberId == id); // changed this line and this is where i get the error message saying value cannot be Null
            
           return PartialView("PartNumberView",    partNumber);
}

所以是的，我收到错误消息，说

so yeah i get the error message saying that

Quote：

{'System.Data.Entity.Infrastructure.DbQuery< myproject.model.partnumbertable>'不包含'PartNumberManufacturer'的定义}

{"'System.Data.Entity.Infrastructure.DbQuery<myproject.model.partnumbertable>' does not contain a definition for 'PartNumberManufacturer'"}

我做了这些更改。我在这做错了什么？或者是否有一种不同的方法我可以推荐这样做？



谢谢您的时间。

i made those changes. what am i doing wrong here? or is there a different approach i can be recommended to in order to achieve this?

thank you for your time.

推荐答案

我认为您需要在查询中添加ToList（）：

I think that you need to add a ToList() to your query:

Context.PartNumberTable.Where(x => x.PartNumberId == id).ToList();

如果没有ToList（），你试图返回一个DbQuery对象到您的视图，而不是具有PartNumberManufacturer属性的对象列表。



此外，在您的视图中，您必须将@Model视为列表或IEnumberable并迭代它。

Without the ToList() you are trying to return a DbQuery object to your view, not a list of objects with a PartNumberManufacturer property.

Also, in your view you will have to treat your @Model as a list or IEnumberable and iterate over it.

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