如何返回JsonResult [关闭]

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                    <p class="mb0 mt6">Closed <span title="2017-08-17 12:31:45Z" class="relativetime">2 years ago</span>.</p>
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I'm having trouble writing this AJAX method.

I want to return a JsonResult. (Seems like the logical thing to do.) All the examples I could find use Json() to convert the result to a JsonResult.

[HttpPost]
public JsonResult GetScoreResults(string userId, int chapterId)
{
    return new Json(ChapterScoreResultsModel.Create(DbContext, userId, chapterId));
}

But when I try this:

The type or namespace name 'Json' could not be found (are you missing a using directive or an assembly reference?)

However, I can't find this symbol anywhere and all the articles I found that used it didn't seem to do anything special. I did find the symbol in the namespace System.Web.Helpers but when I add a using for that, I get the error:

Cannot create an instance of the static class 'Json'

What is the current way to return a JsonResult from an AJAX method?

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Answer 1

The Controller class has a Json method. Invoking it returns a JsonResult. Note that it's method, not a constructor. You do not put the new keyword in front of the method call.

return Json(ChapterScoreResultsModel.Create(DbContext, userId, chapterId));