Response.Write - Internet Explorer中的文件名编码错误 [英] Response.Write - filename encoding wrong in Internet Explorer

问题描述

  Response.AppendHeader（content-disposition ，attachment; filename =+ FileName）; 
 Response.ContentType = MimeType; 
 Response.WriteFile（PathToFile）; 
 Response.End（）; 
  

这工作正常。问题是，当我从Internet Explorer下载文件时，特殊字符，如丹麦æ，ø和å，被解释错误。所以我以Testæøåfile.txt的名称下载为'TestÃ|_ø_Ã¥file.txt'

我尝试添加Byte订单标记为响应：

  byte [] BOM = {0xEF，0xBB，0xBF}; 
 Response.BinaryWrite（BOM）; 
  

并设置字符集：

  Response.Charset =UTF-8; 
 Response.ContentEncoding = System.Text.Encoding.UTF8; 
  

但是没有帮助。
这似乎只是Internet Explorer中的一个问题。

解决方案

标题不使用内容，所以不会改变内容的编码。有一个标准的标题参数的编码，但它是相当新的，所以它不会完全支持所有浏览器：

http://greenbytes.de/tech/webdav/rfc5987.html

这是你如何编码的名字：

  string FileName =Testæøåfile.txt ; 
 
 string name = String.Concat（Encoding.UTF8.GetBytes（FileName）.Select（b => {
 if（（b> = 48&& （b> = 97&& b< = 122））{
返回新的String（（ char）b，1）; 
} else {
 return String.Format（％{0：x2}，b）; 
} 
}）ToArray（） ）; 
 
 Response.AppendHeader（content-disposition，attachment; filename * = UTF-8+名称）; 
  

标题中的文本将如下所示：

 附件;文件名* = UTF-8''Test％20％c3％a6％20％c3％b8％20％c3％a5％20file％2etxt 
  

注意：代码对除字母数字以外的所有字符进行编码。这有效，但并不是所有其他字符都需要编码。检查标准后，您可以将代码进化为不再编码的字符。

I use the following code to send files from my server to the client:

Response.AppendHeader("content-disposition", "attachment; filename=" + FileName);
Response.ContentType = MimeType;
Response.WriteFile(PathToFile);
Response.End();

This works fine. Problem is, that when I download files from Internet Explorer, special characters, like the danish æ, ø and å, gets interpreted wrong. So i file with the name 'Test æ ø å file.txt' downloads as 'Test æ_ø_Ã¥ file.txt'

I´ve tried adding Byte Order Mark to the response:

byte[] BOM = { 0xEF, 0xBB, 0xBF };
Response.BinaryWrite(BOM);

And setting the charset:

Response.Charset = "UTF-8";
Response.ContentEncoding = System.Text.Encoding.UTF8;

But none if it helped. This seems only to be a problem in Internet Explorer.

解决方案

The headers doesn't use the encoding of the content, so it won't help to change the content encoding. There is a standard for specifying encoding for the header parameters, but it's pretty new, so it won't be fully supportred in all browsers:

http://greenbytes.de/tech/webdav/rfc5987.html

This is how you would encode the name:

string FileName = "Test æ ø å file.txt";

string name = String.Concat(Encoding.UTF8.GetBytes(FileName).Select(b => {
  if ((b >= 48 && b <= 57) || (b >= 65 && b <= 90) || (b >= 97 && b <= 122)) {
    return new String((char)b, 1);
  } else {
    return String.Format("%{0:x2}", b);
  }
}).ToArray());

Response.AppendHeader("content-disposition", "attachment; filename*=UTF-8''" + name);

The text ending up in the header would look like this:

attachment; filename*=UTF-8''Test%20%c3%a6%20%c3%b8%20%c3%a5%20file%2etxt

Note: The code encodes all characters except alphanumeric. That works, but not all other characters need encoding. You could evolve the code to leave a few more characters unencoded, after checking the standards.

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