ASP.NET MVC 控制器可以返回图像吗? [英] Can an ASP.NET MVC controller return an Image?

问题描述

我可以创建一个只返回图像资产的控制器吗?

Can I create a Controller that simply returns an image asset?

每当请求如下 URL 时，我想通过控制器路由此逻辑:

I would like to route this logic through a controller, whenever a URL such as the following is requested:

www.mywebsite.com/resource/image/topbanner

控制器将查找 topbanner.png 并将该图像直接发送回客户端.

The controller will look up topbanner.png and send that image directly back to the client.

我见过这样的例子，你必须创建一个视图 - 我不想使用视图.我只想用控制器来完成这一切.

I've seen examples of this where you have to create a View - I don't want to use a View. I want to do it all with just the Controller.

这可能吗?

推荐答案

使用基本控制器 File 方法.

Use the base controllers File method.

public ActionResult Image(string id)
{
    var dir = Server.MapPath("/Images");
    var path = Path.Combine(dir, id + ".jpg"); //validate the path for security or use other means to generate the path.
    return base.File(path, "image/jpeg");
}

请注意，这似乎相当有效.我做了一个测试，我通过控制器(http://localhost/MyController/Image/MyImage)和直接 URL(http://localhost/Images/MyImage.jpg)，结果是:

As a note, this seems to be fairly efficient. I did a test where I requested the image through the controller (http://localhost/MyController/Image/MyImage) and through the direct URL (http://localhost/Images/MyImage.jpg) and the results were:

• MVC:每张照片 7.6 毫秒
• 直接:每张照片 6.7 毫秒

• MVC: 7.6 milliseconds per photo
• Direct: 6.7 milliseconds per photo

注意:这是请求的平均时间.平均值是通过在本地计算机上发出数千个请求来计算的，因此总数不应包括网络延迟或带宽问题.

Note: this is the average time of a request. The average was calculated by making thousands of requests on the local machine, so the totals should not include network latency or bandwidth issues.

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