Core 2.1 HttpRequest.Body 尝试读取时为空

Question

我正在尝试从 HttpRequest.Body 读取流数据，但我得到的是空字符串。 请求是从 .net 项目发送到这里的

        HttpWebRequest request = null;
        Uri uri = new Uri(**Endpoint**);
        UTF8Encoding encoding = new UTF8Encoding();
        byte[] bytes = encoding.GetBytes(message);
        request = (HttpWebRequest)WebRequest.Create(uri);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = bytes.Length;
        request.UseDefaultCredentials = true;
        using (Stream writeStream = request.GetRequestStream()) {
            writeStream.Write(bytes, 0, bytes.Length);
        }
        try {
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK) {
                return true;
            } else {
                return false;
            }
        } catch {
            lock (endpointLock) {
                _pushHttpEndpoint = null;
            }
            return false;
        }

请求在此处发送。这是 .net core 2.1 应用程序。我正在尝试读取请求正文中的数据，但返回的是空的

    [HttpPost]
    public string Post()
    {
        var bodyStr = "";
        var req = HttpContext.Request;           
        req.EnableRewind();            
        using (StreamReader reader
                  = new StreamReader(req.Body, Encoding.UTF8, true, 1024, true))
        {
            bodyStr = reader.ReadToEnd();
        }    

        req.Body.Seek(0, SeekOrigin.Begin);
        //do other stuff
        return bodyStr;
     }

有人可以帮我解决这个问题吗？ 我们处于无法更改 .net 解决方案代码的位置。任何更改都应在 .net 核心解决方案方面进行。我们正在尝试用新的 api 代替现有的 Endpoint。 :(

Answer 1

首先我知道问题是关于 ASP.NET Core 2.1，但我在 2.2 上遇到了同样的问题。

我就是这样解决的：

在 ASP.NET Core 2.2 中启用此功能的方法如下：

首先在请求管道级别启用缓冲。这是在 Startup.cs 类中完成的。

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
  {

    // Configure the HTTP request pipeline.
    app.Use(async (context, next) =>
    {
      //enable buffering of the request

      context.Request.EnableBuffering();

      await next();

    });
  }

第二个动作：

  Request.EnableRewind();
  Request.Body.Seek(0, SeekOrigin.Begin);

  using (var reader = new StreamReader(Request.Body, Encoding.ASCII))
  {
    var requestBody = reader.ReadToEnd();
    // Reset the stream just in case it is needed further down the execution pipeline       
    Request.Body.Seek(0, SeekOrigin.Begin);
  }

Answer 2

你的类型是 "type is application/x-www-form-urlencoded" ，所以使用 [FromForm] 属性。以下代码供您参考：

.Net 项目：

        HttpWebRequest request = null;
        Uri uri = new Uri("https://localhost:44365/Home/Post");
        UTF8Encoding encoding = new UTF8Encoding();
        var postData = "thing1=hello";
        postData += "&thing2=world";
        byte[] bytes = encoding.GetBytes(postData);
        request = (HttpWebRequest)WebRequest.Create(uri);
        request.Method = "POST";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = bytes.Length;
        request.UseDefaultCredentials = true;
        using (Stream writeStream = request.GetRequestStream())
        {
            writeStream.Write(bytes, 0, bytes.Length);
        }
        try
        {
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                //return true;
            }
            else
            {
               // return false;
            }
        }
        catch(Exception e)
        {

        }

在您的 .net 核心项目上：

    [HttpPost]
    public string Post([FromForm]AcceptValue acceptValue)
    {

        //do other stuff
        return "";
    }

    public class AcceptValue {
        public string thing1 { get; set; }

        public string thing2 { get; set; }
    }

Answer 3

您应该使用 [FromBody] 属性。

会是这样的：

[HttpPost]
public string Post([FromBody] object body) {
// do stuff here
}