ASP.NET MVC控制器无法正确返回带有流内容的HttpResponseMessage [英] ASP.NET MVC Controller cannot return HttpResponseMessage correctly with streamed content

问题描述

正如标题所述，我没有让MVC控制器正确返回HttpResponseMessage.

Just as the title says I am not getting the MVC Controller to return HttpResponseMessage correctly.

    [HttpGet]
    [AllowAnonymous]
    public HttpResponseMessage GetDataAsJsonStream()
    {
        object returnObj = new
        {
            Name = "Alice",
            Age = 23,
            Pets = new List<string> { "Fido", "Polly", "Spot" }
        };

        var response = Request.CreateResponse(HttpStatusCode.OK);
        var stream = new MemoryStream().SerializeJson(returnObj);
        stream.Position = 0;
        response.Content = new StreamContent(stream);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");

        return response;
    }

这是我使用MVC控制器得到的:

This is what I got using MVC Controller:

在使用WebApi ApiController时工作正常

It works fine when using WebApi ApiController

如果我错了，请纠正我，我认为问题是MVC正在序列化HttpResponseMessage而不是返回它.

Correct me if I'm wrong I think the problem is MVC is serializing HttpResponseMessage instead of returning it.

通过我使用MVC 5的方式.

By the way I am using MVC 5.

谢谢.

编辑 返回大型数据集时，我希望可以灵活地直接写入响应流.

EDIT I would like to have the flexibility to write to the response stream directly when returning large datasets.

推荐答案

感谢Phil，我让MVC控制器返回FileStreamResult使它能够正常工作.

Thanks to Phil I got it to work by having the MVC controller return FileStreamResult.

这是代码

    public ActionResult GetDataAsJsonStream()
    {
        object returnObj = new
        {
            Name = "Alice",
            Age = 23,
            Pets = new List<string> { "Fido", "Polly", "Spot" }
        };

        var stream = new MemoryStream().SerializeJson(returnObj);
        stream.Position = 0;

        return File(stream, "application/json");
    }

更新

一种更好的方法是直接写入响应流而无需创建内存流

A better way to do this is to write directly to the response stream without creating a memory stream

    public ActionResult GetJsonStreamWrittenToResponseStream()
    {
        object returnObj = new
        {
            Name = "Alice",
            Age = 23,
            Pets = new List<string> { "Fido", "Polly", "Spot" }
        };

        Response.ContentType = "application/json";
        Response.OutputStream.SerializeJson(returnObj);

        return new EmptyResult();
    }

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