HttpContext.Current.Server.MapPath和HttpContext.Current.Request.Url.Authority之间的区别 [英] Difference Between HttpContext.Current.Server.MapPath and HttpContext.Current.Request.Url.Authority

问题描述

在我的网站上我正在上传一个音频文件，该文件保存在项目文件夹中。然后在查看页面时，我想检查上传的文件是否存在于项目文件夹中。我该怎么检查呢。我用这个函数来获取URL并检查该文件中是否存在文件

  public   string  GetAbsoluteUrl（ string  relativePath）
 {
 尝试 
 {
  //  使用权限获取主机和端口 
  //  仅获取主机DnsSafeHost  
  string  host = HttpContext.Current.Request.Url.Authority; 
  string  protocol = HttpContext.Current.Request.Url.Scheme; 
  return   string  .Format（  {0}：// {1} / {2}，protocol，host，relativePath.Trim（））; 
} 
  catch （例外情况）
 {
  throw  ex; 
} 
} 
 

或者只使用HttpContext.Current.Server.MapPath +文件夹名称+文件名并检查文件是否存在..请帮帮我...



我也想知道什么;两者之间的区别

解决方案

使用Server.MapPath：它将相对于您的网站路径（如〜/ uploads / MP3 /）转换为您可以在File.Exists方法：

  if （File.Exists（Server.MapPath（ 〜/ Uploads / MP3 / + filename）））
 {
 ...  文件
} 

如果你打算放置，你只需要一个绝对的URL直接链接到客户端网页上的文件的永久链接（这不是一个好主意，因为这意味着该文件夹必须是公开可用的e）所示。

Hi,

In my website i am uploading an audio file, which is saved in project folder. Then while viewing a page, i want to check whether the uploaded file exists in the project folder. How can i check it.Shall I used this function to get the URL and check whether file existed in that url

public string GetAbsoluteUrl(string relativePath)
      {
          try
          {
              //Get host and port by using Authority
              //Get host only by DnsSafeHost
              string host = HttpContext.Current.Request.Url.Authority;
              string protocol = HttpContext.Current.Request.Url.Scheme;
              return string.Format("{0}://{1}/{2}", protocol, host, relativePath.Trim());
          }
          catch (Exception ex)
          {
              throw ex;
          }
      }

Or just use HttpContext.Current.Server.MapPath + Folder name+ file name and check whether the file exists or not.. Please help me out...

I also want to know what;s the difference between the two

解决方案

Use Server.MapPath: It converts a relative-to-your-website path like "~/uploads/MP3/" to a full path specification you can use in the File.Exists method:

if (File.Exists(Server.MapPath("~/Uploads/MP3/" + filename)))
    {
    ... do something with the file
    }

You would only need an absolute URL if you are planning on putting a permanent link to the file directly onto the clients webpage (which isn't a good idea, as it means the folder must be publically available).

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