将 Json 数据流式传输到 ASP.NET ApiController

Question

我正在尝试编写一个 ApiController 在响应中流式传输 JSON 数据。它是这样的；

public class MyController : ApiController
{
    IDocumentWriter _writer;

    public MyController(IDocumentWriter writer)
    {
        _writer = writer;
    }

    [HttpGet]
    public async Task<HttpResponseMessage> Get()
    {
        var response = Request.CreateResponse(HttpStatusCode.OK);

        using (var stream = new MemoryStream())
        {
            response.Content = new StreamContent(stream);
            await _writer.WriteAsync(stream);
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            response.Content.Headers.ContentLength = stream.Length;
        }

        return response;
    }
}

IDocumentWriter 接受流并将 JSON 数据写入其中。对 Get 的调用失败并显示 System.Threading.Tasks.TaskCanceledException，我不明白，因为我正在等待 WriteAsync。确定它在返回之前写完了吗？我做错了什么？

Answer 1

感谢 this post，我弄明白了。原来我把事情复杂化了。这是最终的解决方案；

[HttpGet]
public async Task<HttpResponseMessage> Get()
{
    var response = Request.CreateResponse(HttpStatusCode.OK);

    response.Content = new PushStreamContent(async (stream, content, context) =>
    {
        await _writer.WriteAsync(stream);
        stream.Close();
    }, "application/json");

    return response;
}

将 Json 数据流式传输到 ASP.NET ApiController

Streaming Json data to ASP.NET ApiController

c#

asp.net

asp.net-apicontroller