从ASP.NET Core 2.0中的中间件获取HttpContext内部的请求正文 [英] getting the request body inside HttpContext from a Middleware in asp.net core 2.0

问题描述

我有一个简单的中间件，可获取请求的主体并将其存储在字符串中.它可以很好地读取流，但问题是它不会调用我的控制器，而该控制器在我读取流并抛出错误后立即调用

I am having a simple middleware which fetches the body of the request and store it in a string. It is reading fine the stream, but the issue is it wont call my controller which called just after I read the stream and throw the error

需要一个非空的请求正文

A non-empty request body is required

.下面是我的代码.

  public async Task Invoke(HttpContext httpContext)
            {
                var timer = Stopwatch.StartNew();
                ReadBodyFromHttpContext(httpContext);
                await _next(httpContext);
                timer.Stop();
            }

   private string ReadBodyFromHttpContext(HttpContext httpContext)
        {
           return await new StreamReader(httpContext.Request.Body).ReadToEndAsync();
        }

推荐答案

您需要将HttpContext.Request.Body从仅转发内存流转换为可搜索流，如下所示.

You need to convert HttpContext.Request.Body from a forward only memory stream to a seekable stream, shown below.

//  Enable seeking
context.Request.EnableBuffering();
//  Read the stream as text
var bodyAsText = await new System.IO.StreamReader(context.Request.Body).ReadToEndAsync();
//  Set the position of the stream to 0 to enable rereading
context.Request.Body.Position = 0; 

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