將參數添加到路由時Request.Body發生更改

我正在處理處理多部分POST請求的ASP.NET Core API。將參數添加到路由時Request.Body發生更改

今天我試圖給路由添加一個參數，當我試圖在MultipartReader上調用ReadNextSectionAsync時觸發IOException（意外的流結束）。

在這兩種情況下，我都將（使用ObjectDumper）MultipartReader轉儲到日誌，唯一的區別（除了明顯的邊界）是內部流的字段。該流是我直接從控制器傳遞的Request.Body。

我將展示一個小例子，這種差異：

[Route("foo/")] 
public class FooController : Controller 
{ 
    private readonly ILogger<FooController> _log; 

    public FooController(ILoggerFactory loggerFactory) 
    { 
     _log = loggerFactory.CreateLogger<FooController>(); 
    } 

    [HttpPost("1/bar")] 
    public void Foo() 
    { 
     _log.LogInformation(Request.Body.DumpToString("Works")); 
    } 
}

這將記錄如下：

INFO: #1: Works [Microsoft.AspNetCore.Server.Kestrel.Internal.Http.FrameRequestStream] 
{ 
    properties { 
     CanRead = True [System.Boolean] 
     CanSeek = False [System.Boolean] 
     CanWrite = False [System.Boolean] 
     #2: Length = TargetInvocationException: Exception has been thrown by the target of an invocat (+4 chars) [System.Reflection.TargetInvocationException] 
     #3: Position = TargetInvocationException: Exception has been thrown by the target of an invocat (+4 chars) [System.Reflection.TargetInvocationException] 
     CanTimeout = False [System.Boolean] 
     #4: ReadTimeout = TargetInvocationException: Exception has been thrown by the target of an invocat (+4 chars) [System.Reflection.TargetInvocationException] 
     #5: WriteTimeout = TargetInvocationException: Exception has been thrown by the target of an invocat (+4 chars) [System.Reflection.TargetInvocationException] 
    } 
    fields { 
     #6: _body [Microsoft.AspNetCore.Server.Kestrel.Internal.Http.MessageBody+ForContentLength] 
     { 
     properties { 
      RequestKeepAlive = True [System.Boolean] 
     } 
     fields { 
      _contentLength = 242 [System.Int64] 
      _inputLength = 242 [System.Int64] 
     } 
     } 
     _state = Open [Microsoft.AspNetCore.Server.Kestrel.Internal.Http.FrameStreamState] 
     { 
     fields { 
      value__ = 0 [System.Int32] 
     } 
     } 
    } 
}

但是，如果我這樣做：

[Route("foo/")] 
public class FooController : Controller 
{ 
    // ... 
    // Same logging setup 
    // ... 

    [HttpPost("{id:int}/bar")] // This doesn't actually need to change 
    public void Foo(int id) 
    { 
     _log.LogInformation(Request.Body.DumpToString("Doesn't work")); 
    } 
}

的_inputLength字段的值爲0. 然後，當我創建一個MultipartReader與此流它失敗時首次致電ReadNextSectionAsync。

這看起來有點像我的ASP.NET核心錯誤，但我是ASP.NET的新手，所以我可能會錯過重要的東西！

來源

2016-10-03 KevinG

它看起來像在路由中添加一個參數觸發了ASP.NET模型綁定，它讀取了請求主體。之後，我無法閱讀它。

這給我留下了兩個選項：

使用模型綁定來讀取文件以及
不使用模型綁定都找到獲取參數的另一種方式。

我選擇了第二個選項，寫這樣的：

[HttpPost("{id:int}/bar")] 
public void Foo() 
{ 
    int id = Int32.Parse((string)RouteData.Values["id"]); 

    // ... 
}

來源

2016-10-05 16:35:05 KevinG

將參數添加到路由時Request.Body發生更改

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