从 ASP.NET 提供 ISO-8859-1 和 UTF-8 文件

Question

我们有一个包含数千个静态 html 文件的大型网站。其中一些是 ISO-8859-1，另一些是 UTF-8（有和没有字节顺序标记）。

web.config 文件如下所示：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.web>
    <globalization requestEncoding="utf-8" responseEncoding="utf-8" fileEncoding="utf-8" />
  </system.web>
</configuration>

如果我将 fileEncoding 更改为 "ISO-8859-1" 它适用于 ISO-8859-1 和 UTF-8如果有字节顺序标记。我们试图避免手动检查字节顺序标记并将其添加到没有它们的文件中。有没有办法做到这一点？

文件具有字符集元标记。我们可以让服务器读取它来确定文件编码吗？

编辑

如果我删除到 aspnet_isapi.dll 的通配符应用程序映射，则可以正确提供文件。有没有办法让通配符匹配除 .html 之外的所有内容？

Answer 1

您可以自动检查文件以查看它们是否包含所述字符/它们是否为 utf-8。

这是一段代码，在谷歌搜索该目的时弹出found here：

System.Text.Encoding enc = null; 
System.IO.FileStream file = new System.IO.FileStream(filePath, 
    FileMode.Open, FileAccess.Read, FileShare.Read); 
if (file.CanSeek) 
{ 
    byte[] bom = new byte[4]; // Get the byte-order mark, if there is one 
    file.Read(bom, 0, 4); 
    if ((bom[0] == 0xef && bom[1] == 0xbb && bom[2] == 0xbf) || // utf-8 
        (bom[0] == 0xff && bom[1] == 0xfe) || // ucs-2le, ucs-4le, and ucs-16le 
        (bom[0] == 0xfe && bom[1] == 0xff) || // utf-16 and ucs-2 
        (bom[0] == 0 && bom[1] == 0 && bom[2] == 0xfe && bom[3] == 0xff)) // ucs-4 
    { 
        enc = System.Text.Encoding.Unicode; 
    } 
    else 
    { 
        enc = System.Text.Encoding.ASCII; 
    } 

    // Now reposition the file cursor back to the start of the file 
    file.Seek(0, System.IO.SeekOrigin.Begin); 
} 
else 
{ 
    // The file cannot be randomly accessed, so you need to decide what to set the default to 
    // based on the data provided. If you're expecting data from a lot of older applications, 
    // default your encoding to Encoding.ASCII. If you're expecting data from a lot of newer 
    // applications, default your encoding to Encoding.Unicode. Also, since binary files are 
    // single byte-based, so you will want to use Encoding.ASCII, even though you'll probably 
    // never need to use the encoding then since the Encoding classes are really meant to get 
    // strings from the byte array that is the file. 

    enc = System.Text.Encoding.ASCII; 
}