System.Linq.Queryable不是一个属性类错误？ [英] System.Linq.Queryable is not an attribute class error?

问题描述

我收到一个错误，当添加[Queryable]的错误是类似这样'System.Linq.Queryable'不是一个属性类

I am getting an error when adding [Queryable] the error is similar like this 'System.Linq.Queryable' is not an attribute class

当我试图在[System.Web.Http.Queryable]之前添加命名空间我有另一个错误

when I tried to add namespace before [System.Web.Http.Queryable] I got another error

System.Web.Http.QueryableAttribute类型
System.Web.Http.OData.dll和System.Web.Http.dll

The type System.Web.Http.QueryableAttribute exists in both System.Web.Http.OData.dll and System.Web.Http.dll

如何解决？ / p>

How to resolve this?

推荐答案

正如SonerGönül说的。
最可能你有
两个在你的cs文件中使用指令：

As Soner Gönül said. Most probably you have two using directives in your cs file:

using System.Web;
using System.Web.Http;

都定义属性。请删除其中一个命名空间或完全限定您的属性为

both define the attribute. Either remove one of those namespaces or fully qualify your attribute either as

[System.Web.Queryable]
// or
[System.Web.Http.Queryable]

和你需要什么。您将在相应的MSDN文档中找到更多帮助。

Depending what the difference is of both and what you need. You will find more help in the corresponding MSDN documentation of both.

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