blocks|key|1096071|text|尝试用ReadAsAsync<string>()替换ReadAsStringAsync()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1096072|entityMap^0|3|L|Q|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Try replacing <code>ReadAsStringAsync()</code> with <code>ReadAsAsync&lt;string&gt;()</code>.

blocks|key|84370|text|最后，我通过继承基本接口而不是ApiController实现了这一点-我认为ApiController是模型绑定，它吃掉了响应|type|unstyled|depth|inlineStyleRanges|entityRanges|data|84371|编辑:构建代理的正确方法是MessageHandler，而不是ApiController|84372|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I got this working in the end by inheriting from the base interface instead of ApiController - I think the ApiController was modelbinding which was eating the response

edit: The right thing for building a proxy is a MessageHandler, not an ApiController

blocks|key|1728455|text|我也为此而苦苦挣扎。ReadAsStringAsync和ReadAsAsync返回一个任务对象。引用Result属性将返回内容。可能是引用Result属性导致异步读取请求阻塞。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1728456|示例：|1728457|string+str+=+response.Content.ReadAsStringAsync().Result;|code-block|syntax|javascript|1728458|entityMap^0|A|H|S|B|1E|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

I too struggled with this. <code>ReadAsStringAsync</code> and <code>ReadAsAsync</code> return a task object. Referencing the <code>Result</code> property returns the content. It may be referencing the Result property causes the async read request to block.

Example:

<pre><code>string str = response.Content.ReadAsStringAsync().Result;
</code></pre>

blocks|key|84430|text|您应该为参数使用复杂类型，然后在主体中使用一些json，如|type|unstyled|depth|inlineStyleRanges|entityRanges|data|84431|{路径："c:...“}|84432|Als使用|84433|Content-Type:+application/json；charset=UTF-8|84434|标头，以便web+api知道json包含在主体中。|84435|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

You should use a complex type for your argument and then in the body use some json like

{ path: "c:..." }

Als use the 

Content-Type: application/json; charset=UTF-8 

header in your post request so that the web api knows that json is contained in the body

blocks|key|1728512|text|我相信你关于ApiController吃Request.Content的说法是对的。您在ApiController中看到的"Request“对象实际上是System.Net.Http.HttpRequestMessage类型。我能够解决这个问题，但是像这样备份到System.Web.HttpRequest对象：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1728513|Dim+content+as+string
If+HttpContext.Current.Request.InputStream.CanSeek+Then
++++HttpContext.Current.Request.InputStream.Seek(0,+IO.SeekOrigin.Begin)
End+If
Using+reader+As+New+System.IO.StreamReader(HttpContext.Current.Request.InputStream)
++++content+=+reader.ReadToEnd()
End+Using|code-block|syntax|javascript|1728514|我不知道seek的倒带是否有必要，但我把它放在了以防万一。|1728515|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I believe you are right about the ApiController eating the Request.Content. The "Request" object that you see in the ApiController is actually of type System.Net.Http.HttpRequestMessage. I was able to work around this issue but backing up to the System.Web.HttpRequest object like such:

<pre><code>Dim content as string
If HttpContext.Current.Request.InputStream.CanSeek Then
 HttpContext.Current.Request.InputStream.Seek(0, IO.SeekOrigin.Begin)
End If
Using reader As New System.IO.StreamReader(HttpContext.Current.Request.InputStream)
 content = reader.ReadToEnd()
End Using</code></pre>

I don't know if the seek rewind is necessary but I put it in just in case.

blocks|key|1728556|text|post的这个签名吃掉了post数据：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1728557|public+HttpResponseMessage+Post([FromBody]string+postdata)|code-block|syntax|javascript|1728558|将其更改为：|1728559|public+HttpResponseMessage+Post()|1728560|然后这个调用可以很好地获取post数据：|1728561|string+str+=+response.Content.ReadAsStringAsync().Result;|1728562|我自己测试过的。使用第一个签名，str为空，使用第二个str有post数据！|1728563|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

This signature for post eats the post data:

<pre><code>public HttpResponseMessage Post([FromBody]string postdata)
</code></pre>

change it to:

<pre><code>public HttpResponseMessage Post()
</code></pre>

then this call works fine to get the post data:

<pre><code>string str = response.Content.ReadAsStringAsync().Result;
</code></pre>

Tested it my self. use the first signature, str is empty, use the second str has post data!

blocks|key|1096557|text|我意识到这是旧的，并且已经得到了回答，但无论它的价值是什么，你不能使用ReadAsStringAsync()的原因并不是因为它像所建议的那样‘吃掉数据’，而是因为内容被作为流处理，并且由于数据已经被消息格式化程序使用，流的位置已经在末尾。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1096558|为了使用ReadAsStringAsync()，您首先需要将内容流位置重置到开头。|1096559|我这样做：response.RequestMessage.Content.ReadAsStreamAsync().Result.Seek(+0,+System.IO.SeekOrigin.Begin+)，因为我只有HttpResponseMessage，但是如果你可以直接访问HttpRequestMessage+(就像你在控制器中做的那样)，你可以使用Request.Content.ReadAsStreamAsync().Result.Seek(+0,+System.IO.SeekOrigin.Begin+)，我想它在功能上是等效的。|1096560|后期编辑|BOLD|1096561|如上所述，使用Result读取异步流在许多情况下会导致死锁和线程阻塞。如果你必须以同步的方式读取异步数据流，最好使用下面的形式：|1096562|+new+TaskFactory(+CancellationToken.None,+
++++++++++++++++++TaskCreationOptions.None,+
++++++++++++++++++TaskContinuationOptions.None,+
++++++++++++++++++TaskScheduler.Default+)
++++++.StartNew<Task<TResult>>(+func+)
++++++.Unwrap<TResult>()
++++++.GetAwaiter()
++++++.GetResult();|code-block|syntax|javascript|1096563|其中，func是您要运行的异步操作，因此在本例中，它将类似于async+()+=>+{+await+Request.Content.ReadAsStreamAsync();+}…通过这种方式，您可以将方法的异步部分放在StartNew部分中，并正确地展开编组回同步代码时发生的任何异常。|1096564|更好的是，使整个堆栈同步。|1096565|entityMap^0|Z|J|0|4|J|0|5|2O|4X|28|0|0|4|0|7|6|0|0|3|4|U|1M|31|8|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1A|8|@$9|1B|A|1C|B|L]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1G|8|@]|D|@]|E|$R|S]]|$1|T|3|U|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|V|3|W|5|6|7|1O|8|@]|D|@]|E|$]]|$1|X|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|Y|$]]

I realise this is old, and has been answered, but for what it's worth, the reason you can't use <code>ReadAsStringAsync()</code> isn't because it 'eats the data' as has been suggested, it's because the content is being processed as a stream and since the data has been consumed by the message formatter the Position of the stream is already at the end.

In order to use <code>ReadAsStringAsync()</code> you first need to reset the content stream Position to the beginning.

I do it like this: <code>response.RequestMessage.Content.ReadAsStreamAsync().Result.Seek( 0, System.IO.SeekOrigin.Begin )</code> because I only have the HttpResponseMessage, but if you have direct access to the HttpRequestMessage (as you do inside the Controller) you can use <code>Request.Content.ReadAsStreamAsync().Result.Seek( 0, System.IO.SeekOrigin.Begin )</code> which is functionally equivalent I suppose.

Late Edit

Reading async streams with <code>Result</code> as above will cause deadlocks and blocked threads under a number of circumstances. If you have to read from an async stream in a synchronous way, it's better to use the form:

<pre><code> new TaskFactory( CancellationToken.None, 
 TaskCreationOptions.None, 
 TaskContinuationOptions.None, 
 TaskScheduler.Default )
 .StartNew&lt;Task&lt;TResult&gt;&gt;( func )
 .Unwrap&lt;TResult&gt;()
 .GetAwaiter()
 .GetResult();
</code></pre>

where <code>func</code> is the async action you want to run, so in this case it would be something like <code>async () =&gt; { await Request.Content.ReadAsStreamAsync(); }</code> … in this way you can put the async parts of the method inside the <code>StartNew</code> part and properly unwrap any exceptions that happen when marshalling back to your synchronous code.

Better still, make the whole stack async.

blocks|key|1096572|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1096573|Request.Content.ReadAsStreamAsync().Result.Seek(+0，System.IO.SeekOrigin.Begin)|ordered-list-item|1096574|new+System.IO.StreamReader(Request.Content.ReadAsStreamAsync().Result).ReadToEnd()|1096575|1096576|entityMap^0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|I|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|J|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|K|7|@]|8|@]|9|$]]|$1|F|3|-4|4|5|6|L|7|@]|8|@]|9|$]]|$1|G|3|-4|4|5|6|M|7|@]|8|@]|9|$]]]|H|$]]

<ol>
<li>Request.Content.ReadAsStreamAsync().Result.Seek( 0, System.IO.SeekOrigin.Begin)</li>
<li>new System.IO.StreamReader(Request.Content.ReadAsStreamAsync().Result).ReadToEnd()</li>
</ol>

blocks|key|1728652|text|下面的答案展示了如何从WebAPI中读取POST数据：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1728653|string+postData;
using+(var+stream+=+await+request.Content.ReadAsStreamAsync())
{
++++stream.Seek(0,+SeekOrigin.Begin);
++++using+(var+sr+=+new+StreamReader(stream))
++++{
++++++++postData+=+await+sr.ReadToEndAsync();
++++}
}|code-block|syntax|javascript|1728654|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This late addition to the answers here show how to read the POST data from WebAPI:

<pre><code>string postData;
using (var stream = await request.Content.ReadAsStreamAsync())
{
 stream.Seek(0, SeekOrigin.Begin);
 using (var sr = new StreamReader(stream))
 {
 postData = await sr.ReadToEndAsync();
 }
}
</code></pre>

blocks|key|1728682|text|尝试使用CopyToAsync而不是ReadAsStringAsync似乎可以解决这个问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1728683|var+ms+=+new+MemoryStream();
await+response.Content.CopyToAsync(ms);
ms.Seek(0,+SeekOrigin.Begin);

var+sr+=+new+StreamReader(ms);
responseContent+=+sr.ReadToEnd();|code-block|syntax|javascript|1728684|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try using CopyToAsync instead of ReadAsStringAsync seems to fix the problem
<pre><code>var ms = new MemoryStream();
await response.Content.CopyToAsync(ms);
ms.Seek(0, SeekOrigin.Begin);

var sr = new StreamReader(ms);
responseContent = sr.ReadToEnd();
</code></pre>

I am writing a proxy using WebApi in a TransferMode.Streamed HttpSelfHostConfiguration exe.

When I use fiddler to post to my ApiController, for some reason I cannot read the Request.Content - it returns "" even if I have POSTed data

<pre><code>public class ApiProxyController : ApiController
{

 public Task&lt;HttpResponseMessage&gt; Post(string path)
 {
 return Request.Content.ReadAsStringAsync().ContinueWith(s =&gt;
 {
 var content = new StringContent(s.Result); //s.Result is ""
 CopyHeaders(Request.Content.Headers, content.Headers);
 return Proxy(path, content);
 }).Unwrap();
 }

 private Task&lt;HttpResponseMessage&gt; Proxy(string path, HttpContent content)
 {
 ...
 }
}
</code></pre>

Here is my web request 

<pre><code>POST http://localhost:3001/api/values HTTP/1.1
Host: localhost:3001
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Content-Type: application/json
Content-Length: 26

{ "text":"dfsadfsadfsadf"}
</code></pre>

What I am doing wrong? Why is s.Result coming back as the empty string rather than the raw json?

Cannot read Request.Content in ASP.NET WebApi controller

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我正在使用TransferMode.Streamed HttpSelfHostConfiguration exe中的WebApi编写代理。当我使用fiddler发布到我的ApiController时，由于某种原因，我无法读取Request.Content -即使我有POSTed数据，它也会返回"“public clas...

问无法读取ASP.NET WebApi控制器中的Request.Content
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问无法读取ASP.NET WebApi控制器中的Request.ContentEN