如何Url.Action工作Asp.net MVC？ [英] How does Url.Action work Asp.net MVC?

问题描述

这是有些关联的另一个问题我问过但我想，为什么不问它分开。

This is somewhat related to another question I've asked but I figure why not ask it seperately.

如果我下像下面这样的看法

If I were to place something like the following in a view

<td><img src='<%= Url.Action( "DisplayImage" , "User" , new { id = item.id} ) %>' alt="" /></td>

时它应该显示这个？

Is it supposed to display this?

<td>
   <img src='/User.mvc/DisplayImage?id=U00915441' alt="" />
</td>

，还是有SRC属性实际上是由于UserController的getImage操作的结果被替换的价值？

Or would the value of the src-attribute actually be replaced with the results of the UserController GetImage Action?

推荐答案

这将构建路径行动，返回一个URL，执行操作的不结果。

It will construct the path to the action, returning a url, not the results of executing the action.

结果将是：

<td>
   <img src='/User.mvc/DisplayImage?id=U00915441' alt="" />
</td>

举例code。假设你的用户模型存储在一个字节数组中的形象。如果您在使用LINQ和属性是二进制，然后用（）将其转换为一个字节数组方法。请注意，这将要求用户在使用GET请求记录的属性。

Example code. assumes your user model has the image stored in a byte array. If you are using LINQ and the property is a Binary, then use the ToArray() method to convert it to a byte array. Note the attributes which will require that the user be logged in and using a GET request.

[Authorize]
[AcceptVerbs( HttpVerbs.Get )]
public ActionResult DisplayImage( string id )
{
     var user = ...get user from database...

     return File( user.Image, "image/jpeg" );
}

}

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