从JsonResult获取数据 [英] Get data from JsonResult

问题描述

代码在ASP.NET Core中.MVC控制器返回Json(someData).我正在尝试在单元测试中检索数据.我能做的最好的就是

The code is in ASP.NET Core. MVC controller returns Json(someData). I am trying to retrieve the data in the Unit test. The best I can do is to have

string data = JsonConvert.SerializeObject(jsonResult.Value);

，然后比较字符串.但是我更希望获得一个对象或一个数组，以便能够进行一些更具体的比较.有趣的是，在调试器下，我可以看到 jsonResult.Value 的类型为 Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable< MyType> ，甚至还有结果视图警告不要扩大它；否则如果我扩展它，我将得到我想要的！在我的情况下，它是一个由4个元素组成的 MyType 对象数组.但是，如果我在jsonResult.Value中从i执行类似的操作，则选择i 会收到错误

and then compare the string. But I would prefer to get an object or an array to be able to do some more specific comparisons. Interesting, under debugger I can see that jsonResult.Value is of type Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable<MyType> and there is even Results View that warns not to expand it or else; and if I expand it, I get exactly what I want! In my case it is a 4-element array of MyType objects. However, if I do something like from i in jsonResult.Value select i I get an error

Could not find an implementation of the query pattern for source type 'object'. 
'Select' not found

我希望有一个比比较JSON字符串更好的方法！

I hope there is a better way than comparing a JSON string!

推荐答案

尝试使用Cast方法

(从jsonResult.Value.Cast< MyType>()中的i中选择i)

修改:更新的答案

 from i in ((IQueryable< MyType >)js.Value) select i

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