[ASP.NET] [C #] Chinese file name garbled when downloading files

Responsible for the website in ASP.NET pages with a program for a download Word / Excel files, recent user requests a file name contains Traditional Chinese characters,
colleagues normal display with chrome / firefox browser download test, but with IE (version 11) is turned on, there was garbled.

1. Prepare a file Chinese file name

ASP.NET MVC

2. Add in HomeControler the download Download

public ActionResult Download()
{
    //文件位置
    string filepath = @"E:testWebApplication1中文文件名.docx";
    //文件名称
    string filename = Path.GetFileName(filepath);
    //读成串流
    Stream sfilestream = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read);
    //回传出文件
    return File(sfilestream, "application/vnd.openxmlformats-officedocument.wordprocessingml.document", filename);
}

3. Perform download

Filename normal display Chinese!

Put on ASP.NET Web Form

4. The first increase in a Download.aspx

In Page load join download

protected void Page_Load(object sender, EventArgs e)
{
    string filepath = @"E:testWebApplication1中文文件名.docx";
    string fileName = Path.GetFileName(filepath);

    HttpContext.Current.Response.AppendHeader("content-disposition", "attachment;filename=" + fileName);
    HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
    HttpContext.Current.Response.WriteFile(filepath);
    HttpContext.Current.Response.End();
}

5. Perform download

File name is not normal

Found two solution

The Chinese file name HttpUtility.UrlEncode to UTF8 encodingQP coding system.
HeaderEncoding coding instead BIG5。

(1) The Chinese filenames QP encoding to UTF8 encoding system with HttpUtility.UrlEncode

string fileName = HttpUtility.UrlEncode(Path.GetFileName(filepath));
//string fileName = Path.GetFileName(filepath);

HttpUtility.UrlEncode for default QP (Quoted-Printable) UTF8 encoding the encoding system, 7 Bit character (ASCII) can be displayed directly on without special conversion.

Coding ago:inCulturefilesname.docx
After the code:% E4% b8% ad% E6% 96% 87% E6% aa% 94%e5% 90% 8d.docx

In addition to the standard ASCII, the other will be encoded by the browser to the distal UTF8.
https://mothereff.in/utf-8

The file name can show the normal Chinese!

(2) HeaderEncoding encoded to BIG5

Add a line to set HeaderEncoding program, because servers are Traditional Chinese, default Encoding.Default = BIG5

HttpContext.Current.Response.HeaderEncoding = System.Text.Encoding.Default;

HttpContext.Current.Response.HeaderEncoding default is UTF8, BIG5 encoding can be changed to solve the problem of Chinese file name

都已经是UTF8编码的网页了，为什么还得要将HeaderEncoding编码改为繁体中文操作系统的BIG5才能解决???
进一步搜寻到保哥、黑暗大文章，看起来似乎与浏览器支持到哪一种Content-Disposition标准有关(RFC2045、2183、5987)。
好，先到此打住，来看奥运了!以后有时间再继续深入调查。

小结:

因为系统被要求要支持多国语系，暂时我们选择第一种解法，以后出现蝌蚪文还是火星文就不怕了。
ASP.NET MVC已经解决了文件名有中文码问题了。

参考：

HttpResponse 类

HttpUtility.UrlEncode

HttpResponse.HeaderEncoding

KB-Open And Download File In Chinese Filename

ASP.NET 如何设定强制下载文件并正确处理中文文件名的问题

How to encode the filename parameter of Content-Disposition header in HTTP?

原文:大专栏 [ASP.NET][C#]下载文件时中文文件名出现乱码

[ASP.NET] [C #] Chinese file name garbled when downloading files

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