将API从.NET框架重写为.netCore，获取System.notsupportedException＆＃x27;尝试获取文件流

Question

我将一个项目迁移到.NET Core MVC，

1. 以前的代码具有用于上传文档的API，将
2. 上述代码重写的同一代码重写到下面的代码，使用的是“使用” Microsoft.aspnetcore.mvc.webapicompatshim“要获得httprequestmessage

[旧代码：在.net框架中工作正常]

public HttpResponseMessage UploadFile(string filetype)//old code
    {
        Stream file = Request.Content.ReadAsStreamAsync().Result;
        string id;
        id = DocumentHelper.SaveDocument(filetype, file);

        return Request.CreateResponse<string>(HttpStatusCode.OK, id);
    }


public  HttpResponseMessage UploadFile(string filetype)//Re-Written Code
    {
        HttpRequestMessageFeature requestMessage = new HttpRequestMessageFeature(Request.HttpContext);
        HttpRequestMessage httpRequestMessage = requestMessage.HttpRequestMessage;
        Stream file = httpRequestMessage.Content.ReadAsStreamAsync().Result;
        string id;
        id = DocumentHelper.SaveDocument(filetype, file);

        return httpRequestMessage.CreateResponse<string>(HttpStatusCode.OK, id);
    }

[1]：https://i.sstatic.net /cc4af.png

尝试使用request.body与流读取器，并启用了

任何指针 。返回类型