从 ActionResult 中获取值<object>在 ASP.Net Core API 方法中<div id="text_translate"><p>我尝试从 ASP.NET 核心 API 方法中的ActionResult&lt;object&gt;获取值。</p><p> API 有不同的 controller。 我尝试使用 controller A 中的 controller B 中的方法返回结果值。 我从 controller B 得到一个ActionResult object。我可以在ResultObject中使用调试器查看该值，但是如何访问其中的结果值？</p><pre> public ActionResult&lt;object&gt; getSourceRowCounter(string sourcePath) //Method from Controller A { var result = ControllerB.GetValue($"{sourcePath}.{rowCounterVariableName}"); var result2 = result.Value; //null var result3 = result.Result; //typ: {Microsoft.AspNetCore.Mvc.OkObjectResult} &lt;-see Value=4 in it with Debugger //var result4 = result3.Value; //Error?. //var result5 = result3;Content? //Error.? //var result6 = result3????;?; //How can i get the Value = 4? return Ok(result); //should only return value 4 and not the whole object }</pre> <p><img src="https://i.stack.imgur.com/4Lppi.jpg" alt="在此处输入图像描述"></p></div></object>

Question

I try to get a value from ActionResult<object> in an ASP.NET Core API method.

The API has a different controller. I try to use a method from controller B in controller A to return the result value. I get an ActionResult object from controller B. I can see the value with the debugger in the ResultObject but how can I get access to the result value in it?

public ActionResult<object> getSourceRowCounter(string sourcePath) //Method from Controller A
{
    var result = ControllerB.GetValue($"{sourcePath}.{rowCounterVariableName}");  
    var result2 = result.Value; //null
    var result3 = result.Result; //typ: {Microsoft.AspNetCore.Mvc.OkObjectResult} <-see Value=4 in it with Debugger
    //var result4 = result3.Value; //Error?!
    //var result5 = result3.Content; //Error?!
    //var result6 = result3.?????; //How can i get the Value = 4?
    return Ok(result); //should only return value 4 and not the whole object
}

Answer 1

If you're sure that it is a type of OkObjectResult then cast before using it like below:

var result3 = (OkObjectResult)result.Result; // <-- Cast is before using it.
var result4 = result3.Value; //<-- Then you'll get no error here.

Answer 2

If you are calling an API from action and the API returns Ok(result) which you want to access in your action then below code can help you:

if (response.StatusCode == System.Net.HttpStatusCode.OK)
{                                   
    return Ok(response.Content); // returns API result
}

Answer 3

Suppose you have example function in Repository.cs :

public async Task<IEnumerable<Todo>> GetTodosAsync() =>
   await _context.Todos.ToListAsync();

And function in Controller.cs looks like below:

public async Task<ActionResult<IEnumerable<Todo>>> GetTodosAsync() =>
    Ok(await _repository.GetTodosAsync());

Then in your UnitTest.cs you can get results by doing this:

var result = await controller.GetCustomersAsync();
// list of todos is in `actual` variable
var actual = (result.Result as OkObjectResult).Value as IEnumerable<CustomerPayload>;
// or use `ObjectResult` instead of `OkObjectResult` for multiple types