Question

我曾经

[HttpPost]        
public ActionResult Foo()
{
    // read HTTP payload
    var reqMemStream = new MemoryStream(HttpContext.Request.BinaryRead(HttpContext.Request.ContentLength));
 ....
}

有效载荷是应用/json;工作精良;然后我改为

public ActionResult Foo(string thing)
{
....
}

The intention being to post to MyController/Foo?thing=yo Now I cant read the payload(the length is correct but the stream is empty). My guess is that the controller plumbing has eaten the payload looking for form post data that can be mapped to the method parameters. Is there some way that I can stop this behavior (surely MVC should not have eaten a payload whose type is marked as JSON , it should only look at form post data). My work around is to add thing to the json but I dont really like that

Answer 1

尝试在读取前重置输入流位置 :

public ActionResult Foo(string thing)
{
    Request.InputStream.Position = 0;
    var reqMemStream = new MemoryStream(HttpContext.Request.BinaryRead(HttpContext.Request.ContentLength));
    ....
}

说到这里,如果你正在发送一个 application/json 有效载荷,为什么在圣地上你不愿意直接阅读请求流,而不是简单地定义和使用查看模型:

public class MyViewModel
{
    public string Thing { get; set; }
    public string Foo { get; set; }
    public string Bar { get; set; }
    ...
}

然后:

public ActionResult Foo(MyViewModel model)
{
    // use the model here 
    ....
}

ASP.NET MVC 3 的内置 JsonValueProvider Factory 允许您自动将JSON的要求绑在模型上。如果您使用旧版本, 将Phil Haack 在 < a href=> http://haacked.com/archive/2010/04/15/sending-json-to- an-asp- net-mvc- action- method-argument.aspx" rel = “no follow” 的博客文章 < /a> 中描述的工厂很容易添加。

友情链接