从 UNC 路径读取文件并在 HTTP 请求中设置正确的 MIME 类型 [英] Reading a file from a UNC path and setting the correct MIME type in a HTTP request

问题描述

我将如何从 UNC 路径读取文件、发现正确的 MIME 类型并将其流式传输到浏览器?

How would I go about reading a file from a UNC path, discovering the proper MIME type, and streaming that out to a browser?

在我看来，我正在重新发明 IIS，而且我还必须为每个文件扩展名维护我自己的 MIME 类型数据库.上述要求听起来合理吗，还是有更好的方法?

It feels to me like I'm re-inventing IIS, and I'll also have to maintain my own MIME type database for each file extension. Does the above request sound reasonable, or is there a better way?

我计划通过 IIS7 上的浏览​​器 HTTP Get 请求将其流式传输.如果重要的话，我也在同一台服务器上运行 Cognos.任何框架都可以(WCF、ASPX 等)

I plan on streaming this out via a browser HTTP Get request on IIS7. If it matters, I'm also running Cognos on the same server. Any framework is OK (WCF, ASPX, etc)

推荐答案

使用 WCF 非常基础:此代码可以托管在 IIS/Service/WAS/etc 下.
我从来没有找到一种方便的方法来处理 mime 类型，你需要有自己的 db 来将文件扩展名映射到 mime 类型.

Using WCF its pretty basic: This code can be hosted under IIS/Service/WAS/etc.
I never found a convenient way to handle the mime type, you will need to have your own db that will map file extension into mime types.

[ServiceContract(SessionMode = SessionMode.NotAllowed)]
public interface IMediaRetriver
{
  [OperationContract]
  [WebGet(UriTemplate = "/get?f={fileName}")]
  Stream Get(string fileName);
}


[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class MediaRetriver : IMediaRetriver
{
    public Stream Get(string fileName)
    {
        // pro tips
        // this will cause the file dialog to show the file name instead of "get"
        WebOperationContext.Current.OutgoingResponse.Headers.Add(
          "Content-disposition", string.Format("inline; filename={0}", fileName));           
        WebOperationContext.Current.OutgoingResponse.ContentType = 
           "application/octet-stream";

        // you want to add sharing here also
        return File.Open(fileName)
    }
}

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