.NET获取文件的MIME类型(Content Type)-白红宇

.NET获取文件的MIME类型(Content Type)

阅读量：6122 次

发布时间：2019-06-21

本文共 15087 字，大约阅读时间需要 50 分钟。

获取文件的MIME类型有很多方法，闲话少絮，直接进入主题，下面是使用C#获取文件的的各种方法。

第一种：这种获取MIME类型（Content Type）的方法需要在 4.5之后才能够支持，但是非常简单。

        
         code 
                            
// 需要先行引入System.Web
// 之后可以直接使用MimeMapping类的静态方法获取文件的MIME类型
string
file = 
@"mimetype.txt"
;
string
contentType = MimeMapping.GetMimeMapping(file);
Console.WriteLine(
"{0}'s MIME TYPE:{1}"
, file, contentType);
// Console output:
/*
mimetype.txt's Mime Type: text/plain
*/
         
       

code
1 2 3 4 5 6 7 8 9 10	`// 需要先行引入System.Web` `// 之后可以直接使用MimeMapping类的静态方法获取文件的MIME类型` `string` `file =` `@"mimetype.txt"` `;` `string` `contentType = MimeMapping.GetMimeMapping(file);` `Console.WriteLine(` `"{0}'s MIME TYPE:{1}"` `, file, contentType);` `// Console output:` `/` `mimetype.txt's Mime Type: text/plain` `/`

优点：方便快捷

缺点：只能在.NET 4.5之后使用

如果没有的MIME TYPE将会返回：

application/octet-stream

第二种：直接在系统中通过文件的后缀获取文件的

        
         code 
                            
// 自定义一个方法
// 通过系统中的Content Type来获取MIME TYPE
public
static
string
GetMimeType(
string
fileName)
{ 
    
string
mimeType = 
"application/unknown"
;
    
string
ext = Path.GetExtension(fileName).ToLower();
    
RegistryKey regKey = Registry.ClassesRoot.OpenSubKey(ext);
    
if
(regKey != 
null
&& regKey.GetValue(
"Content Type"
) != 
null
){ 
        
mimeType = regKey.GetValue(
"Content Type"
).ToString();
    
}
    
return
mimeType;
}
         
       

code
1 2 3 4 5 6 7 8 9 10 11 12	`// 自定义一个方法` `// 通过系统中的Content Type来获取MIME TYPE` `public` `static` `string` `GetMimeType(` `string` `fileName)` `{` `string` `mimeType =` `"application/unknown"` `;` `string` `ext = Path.GetExtension(fileName).ToLower();` `RegistryKey regKey = Registry.ClassesRoot.OpenSubKey(ext);` `if` `(regKey !=` `null` `&& regKey.GetValue(` `"Content Type"` `) !=` `null` `){` `mimeType = regKey.GetValue(` `"Content Type"` `).ToString();` `}` `return` `mimeType;` `}`

优点：

1. 直接快速

2. 没有.NET的版本限制；

缺点：

1. 需要有访问注册表的权限；

2. 获取的Content Type范围受系统环境约束。

这个方法在没有找到对应的MIME Type时，返回的是application/unknow，当然，你也可以自己定义其他任何返回值。

第三种：自己动手写代码，将MimeType写成Mapping类，需要的时候直接使用。

        
         code 
                            
// 通过自己定义一个静态类
// 将所有的Content Type都扔进去吧
// 调用的时候直接调用静态方法即可。
public
static
class
MimeMapping
{ 
    
private
static
Hashtable _mimeMappingTable;
    
private
static
void
AddMimeMapping(
string
extension, 
string
MimeType)
    
{ 
        
MimeMapping._mimeMappingTable.Add(extension, MimeType);
    
}
    
public
static
string
GetMimeMapping(
string
FileName)
    
{ 
        
string
text = 
null
;
        
int
num = FileName.LastIndexOf(
'.'
);
        
if
(0 < num && num > FileName.LastIndexOf(
'\\'
))
        
{ 
            
text = (
string
)MimeMapping._mimeMappingTable[FileName.Substring(num)];
        
}
        
if
(text == 
null
)
        
{ 
            
text = (
string
)MimeMapping._mimeMappingTable[
".*"
];
        
}
        
return
text;
    
}
    
static
MimeMapping()
    
{ 
        
MimeMapping._mimeMappingTable = 
new
Hashtable(190, StringComparer.CurrentCultureIgnoreCase);
        
MimeMapping.AddMimeMapping(
".323"
, 
"text/h323"
);
        
MimeMapping.AddMimeMapping(
".asx"
, 
"video/x-ms-asf"
);
        
MimeMapping.AddMimeMapping(
".acx"
, 
"application/internet-property-stream"
);
        
MimeMapping.AddMimeMapping(
".ai"
, 
"application/postscript"
);
        
MimeMapping.AddMimeMapping(
".aif"
, 
"audio/x-aiff"
);
        
MimeMapping.AddMimeMapping(
".aiff"
, 
"audio/aiff"
);
        
MimeMapping.AddMimeMapping(
".axs"
, 
"application/olescript"
);
        
MimeMapping.AddMimeMapping(
".aifc"
, 
"audio/aiff"
);
        
MimeMapping.AddMimeMapping(
".asr"
, 
"video/x-ms-asf"
);
        
MimeMapping.AddMimeMapping(
".avi"
, 
"video/x-msvideo"
);
        
MimeMapping.AddMimeMapping(
".asf"
, 
"video/x-ms-asf"
);
        
MimeMapping.AddMimeMapping(
".au"
, 
"audio/basic"
);
        
MimeMapping.AddMimeMapping(
".application"
, 
"application/x-ms-application"
);
        
MimeMapping.AddMimeMapping(
".bin"
, 
"application/octet-stream"
);
        
MimeMapping.AddMimeMapping(
".bas"
, 
"text/plain"
);
        
MimeMapping.AddMimeMapping(
".bcpio"
, 
"application/x-bcpio"
);
        
MimeMapping.AddMimeMapping(
".bmp"
, 
"image/bmp"
);
        
MimeMapping.AddMimeMapping(
".cdf"
, 
"application/x-cdf"
);
        
MimeMapping.AddMimeMapping(
".cat"
, 
"application/vndms-pkiseccat"
);
        
MimeMapping.AddMimeMapping(
".crt"
, 
"application/x-x509-ca-cert"
);
        
MimeMapping.AddMimeMapping(
".c"
, 
"text/plain"
);
        
MimeMapping.AddMimeMapping(
".css"
, 
"text/css"
);
        
MimeMapping.AddMimeMapping(
".cer"
, 
"application/x-x509-ca-cert"
);
        
MimeMapping.AddMimeMapping(
".crl"
, 
"application/pkix-crl"
);
        
MimeMapping.AddMimeMapping(
".cmx"
, 
"image/x-cmx"
);
        
MimeMapping.AddMimeMapping(
".csh"
, 
"application/x-csh"
);
        
MimeMapping.AddMimeMapping(
".cod"
, 
"image/cis-cod"
);
        
MimeMapping.AddMimeMapping(
".cpio"
, 
"application/x-cpio"
);
        
MimeMapping.AddMimeMapping(
".clp"
, 
"application/x-msclip"
);
        
MimeMapping.AddMimeMapping(
".crd"
, 
"application/x-mscardfile"
);
        
MimeMapping.AddMimeMapping(
".deploy"
, 
"application/octet-stream"
);
        
MimeMapping.AddMimeMapping(
".dll"
, 
"application/x-msdownload"
);
        
MimeMapping.AddMimeMapping(
".dot"
, 
"application/msword"
);
        
MimeMapping.AddMimeMapping(
".doc"
, 
"application/msword"
);
        
MimeMapping.AddMimeMapping(
".dvi"
, 
"application/x-dvi"
);
        
MimeMapping.AddMimeMapping(
".dir"
, 
"application/x-director"
);
        
MimeMapping.AddMimeMapping(
".dxr"
, 
"application/x-director"
);
        
MimeMapping.AddMimeMapping(
".der"
, 
"application/x-x509-ca-cert"
);
        
MimeMapping.AddMimeMapping(
".dib"
, 
"image/bmp"
);
        
MimeMapping.AddMimeMapping(
".dcr"
, 
"application/x-director"
);
        
MimeMapping.AddMimeMapping(
".disco"
, 
"text/xml"
);
        
MimeMapping.AddMimeMapping(
".exe"
, 
"application/octet-stream"
);
        
MimeMapping.AddMimeMapping(
".etx"
, 
"text/x-setext"
);
        
MimeMapping.AddMimeMapping(
".evy"
, 
"application/envoy"
);
        
MimeMapping.AddMimeMapping(
".eml"
, 
"message/rfc822"
);
        
MimeMapping.AddMimeMapping(
".eps"
, 
"application/postscript"
);
        
MimeMapping.AddMimeMapping(
".flr"
, 
"x-world/x-vrml"
);
        
MimeMapping.AddMimeMapping(
".fif"
, 
"application/fractals"
);
        
MimeMapping.AddMimeMapping(
".gtar"
, 
"application/x-gtar"
);
        
MimeMapping.AddMimeMapping(
".gif"
, 
"image/gif"
);
        
MimeMapping.AddMimeMapping(
".gz"
, 
"application/x-gzip"
);
        
MimeMapping.AddMimeMapping(
".hta"
, 
"application/hta"
);
        
MimeMapping.AddMimeMapping(
".htc"
, 
"text/x-component"
);
        
MimeMapping.AddMimeMapping(
".htt"
, 
"text/webviewhtml"
);
        
MimeMapping.AddMimeMapping(
".h"
, 
"text/plain"
);
        
MimeMapping.AddMimeMapping(
".hdf"
, 
"application/x-hdf"
);
        
MimeMapping.AddMimeMapping(
".hlp"
, 
"application/winhlp"
);
        
MimeMapping.AddMimeMapping(
".html"
, 
"text/html"
);
        
MimeMapping.AddMimeMapping(
".htm"
, 
"text/html"
);
        
MimeMapping.AddMimeMapping(
".hqx"
, 
"application/mac-binhex40"
);
        
MimeMapping.AddMimeMapping(
".isp"
, 
"application/x-internet-signup"
);
        
MimeMapping.AddMimeMapping(
".iii"
, 
"application/x-iphone"
);
        
MimeMapping.AddMimeMapping(
".ief"
, 
"image/ief"
);
        
MimeMapping.AddMimeMapping(
".ivf"
, 
"video/x-ivf"
);
        
MimeMapping.AddMimeMapping(
".ins"
, 
"application/x-internet-signup"
);
        
MimeMapping.AddMimeMapping(
".ico"
, 
"image/x-icon"
);
        
MimeMapping.AddMimeMapping(
".jpg"
, 
"image/jpeg"
);
        
MimeMapping.AddMimeMapping(
".jfif"
, 
"image/pjpeg"
);
        
MimeMapping.AddMimeMapping(
".jpe"
, 
"image/jpeg"
);
        
MimeMapping.AddMimeMapping(
".jpeg"
, 
"image/jpeg"
);
        
MimeMapping.AddMimeMapping(
".js"
, 
"application/x-javascript"
);
        
MimeMapping.AddMimeMapping(
".lsx"
, 
"video/x-la-asf"
);
        
MimeMapping.AddMimeMapping(
".latex"
, 
"application/x-latex"
);
        
MimeMapping.AddMimeMapping(
".lsf"
, 
"video/x-la-asf"
);
        
MimeMapping.AddMimeMapping(
".manifest"
, 
"application/x-ms-manifest"
);
        
MimeMapping.AddMimeMapping(
".mhtml"
, 
"message/rfc822"
);
        
MimeMapping.AddMimeMapping(
".mny"
, 
"application/x-msmoney"
);
        
MimeMapping.AddMimeMapping(
".mht"
, 
"message/rfc822"
);
        
MimeMapping.AddMimeMapping(
".mid"
, 
"audio/mid"
);
        
MimeMapping.AddMimeMapping(
".mpv2"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".man"
, 
"application/x-troff-man"
);
        
MimeMapping.AddMimeMapping(
".mvb"
, 
"application/x-msmediaview"
);
        
MimeMapping.AddMimeMapping(
".mpeg"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".m3u"
, 
"audio/x-mpegurl"
);
        
MimeMapping.AddMimeMapping(
".mdb"
, 
"application/x-msaccess"
);
        
MimeMapping.AddMimeMapping(
".mpp"
, 
"application/vnd.ms-project"
);
        
MimeMapping.AddMimeMapping(
".m1v"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".mpa"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".me"
, 
"application/x-troff-me"
);
        
MimeMapping.AddMimeMapping(
".m13"
, 
"application/x-msmediaview"
);
        
MimeMapping.AddMimeMapping(
".movie"
, 
"video/x-sgi-movie"
);
        
MimeMapping.AddMimeMapping(
".m14"
, 
"application/x-msmediaview"
);
        
MimeMapping.AddMimeMapping(
".mpe"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".mp2"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".mov"
, 
"video/quicktime"
);
        
MimeMapping.AddMimeMapping(
".mp3"
, 
"audio/mpeg"
);
        
MimeMapping.AddMimeMapping(
".mpg"
, 
"video/mpeg"
);
        
MimeMapping.AddMimeMapping(
".ms"
, 
"application/x-troff-ms"
);
        
MimeMapping.AddMimeMapping(
".nc"
, 
"application/x-netcdf"
);
        
MimeMapping.AddMimeMapping(
".nws"
, 
"message/rfc822"
);
        
MimeMapping.AddMimeMapping(
".oda"
, 
"application/oda"
);
        
MimeMapping.AddMimeMapping(
".ods"
, 
"application/oleobject"
);
        
MimeMapping.AddMimeMapping(
".pmc"
, 
"application/x-perfmon"
);
        
MimeMapping.AddMimeMapping(
".p7r"
, 
"application/x-pkcs7-certreqresp"
);
        
MimeMapping.AddMimeMapping(
".p7b"
, 
"application/x-pkcs7-certificates"
);
        
MimeMapping.AddMimeMapping(
".p7s"
, 
"application/pkcs7-signature"
);
        
MimeMapping.AddMimeMapping(
".pmw"
, 
"application/x-perfmon"
);
        
MimeMapping.AddMimeMapping(
".ps"
, 
"application/postscript"
);
        
MimeMapping.AddMimeMapping(
".p7c"
, 
"application/pkcs7-mime"
);
        
MimeMapping.AddMimeMapping(
".pbm"
, 
"image/x-portable-bitmap"
);
        
MimeMapping.AddMimeMapping(
".ppm"
, 
"image/x-portable-pixmap"
);
        
MimeMapping.AddMimeMapping(
".pub"
, 
"application/x-mspublisher"
);
        
MimeMapping.AddMimeMapping(
".pnm"
, 
"image/x-portable-anymap"
);
        
MimeMapping.AddMimeMapping(
".png"
, 
"image/png"
);
        
MimeMapping.AddMimeMapping(
".pml"
, 
"application/x-perfmon"
);
        
MimeMapping.AddMimeMapping(
".p10"
, 
"application/pkcs10"
);
        
MimeMapping.AddMimeMapping(
".pfx"
, 
"application/x-pkcs12"
);
        
MimeMapping.AddMimeMapping(
".p12"
, 
"application/x-pkcs12"
);
        
MimeMapping.AddMimeMapping(
".pdf"
, 
"application/pdf"
);
        
MimeMapping.AddMimeMapping(
".pps"
, 
"application/vnd.ms-powerpoint"
);
        
MimeMapping.AddMimeMapping(
".p7m"
, 
"application/pkcs7-mime"
);
        
MimeMapping.AddMimeMapping(
".pko"
, 
"application/vndms-pkipko"
);
        
MimeMapping.AddMimeMapping(
".ppt"
, 
"application/vnd.ms-powerpoint"
);
        
MimeMapping.AddMimeMapping(
".pmr"
, 
"application/x-perfmon"
);
        
MimeMapping.AddMimeMapping(
".pma"
, 
"application/x-perfmon"
);
        
MimeMapping.AddMimeMapping(
".pot"
, 
"application/vnd.ms-powerpoint"
);
        
MimeMapping.AddMimeMapping(
".prf"
, 
"application/pics-rules"
);
        
MimeMapping.AddMimeMapping(
".pgm"
, 
"image/x-portable-graymap"
);
        
MimeMapping.AddMimeMapping(
".qt"
, 
"video/quicktime"
);
        
MimeMapping.AddMimeMapping(
".ra"
, 
"audio/x-pn-realaudio"
);
        
MimeMapping.AddMimeMapping(
".rgb"
, 
"image/x-rgb"
);
        
MimeMapping.AddMimeMapping(
".ram"
, 
"audio/x-pn-realaudio"
);
        
MimeMapping.AddMimeMapping(
".rmi"
, 
"audio/mid"
);
        
MimeMapping.AddMimeMapping(
".ras"
, 
"image/x-cmu-raster"
);
        
MimeMapping.AddMimeMapping(
".roff"
, 
"application/x-troff"
);
        
MimeMapping.AddMimeMapping(
".rtf"
, 
"application/rtf"
);
        
MimeMapping.AddMimeMapping(
".rtx"
, 
"text/richtext"
);
        
MimeMapping.AddMimeMapping(
".sv4crc"
, 
"application/x-sv4crc"
);
        
MimeMapping.AddMimeMapping(
".spc"
, 
"application/x-pkcs7-certificates"
);
        
MimeMapping.AddMimeMapping(
".setreg"
, 
"application/set-registration-initiation"
);
        
MimeMapping.AddMimeMapping(
".snd"
, 
"audio/basic"
);
        
MimeMapping.AddMimeMapping(
".stl"
, 
"application/vndms-pkistl"
);
        
MimeMapping.AddMimeMapping(
".setpay"
, 
"application/set-payment-initiation"
);
        
MimeMapping.AddMimeMapping(
".stm"
, 
"text/html"
);
        
MimeMapping.AddMimeMapping(
".shar"
, 
"application/x-shar"
);
        
MimeMapping.AddMimeMapping(
".sh"
, 
"application/x-sh"
);
        
MimeMapping.AddMimeMapping(
".sit"
, 
"application/x-stuffit"
);
        
MimeMapping.AddMimeMapping(
".spl"
, 
"application/futuresplash"
);
        
MimeMapping.AddMimeMapping(
".sct"
, 
"text/scriptlet"
);
        
MimeMapping.AddMimeMapping(
".scd"
, 
"application/x-msschedule"
);
        
MimeMapping.AddMimeMapping(
".sst"
, 
"application/vndms-pkicertstore"
);
        
MimeMapping.AddMimeMapping(
".src"
, 
"application/x-wais-source"
);
        
MimeMapping.AddMimeMapping(
".sv4cpio"
, 
"application/x-sv4cpio"
);
        
MimeMapping.AddMimeMapping(
".tex"
, 
"application/x-tex"
);
        
MimeMapping.AddMimeMapping(
".tgz"
, 
"application/x-compressed"
);
        
MimeMapping.AddMimeMapping(
".t"
, 
"application/x-troff"
);
        
MimeMapping.AddMimeMapping(
".tar"
, 
"application/x-tar"
);
        
MimeMapping.AddMimeMapping(
".tr"
, 
"application/x-troff"
);
        
MimeMapping.AddMimeMapping(
".tif"
, 
"image/tiff"
);
        
MimeMapping.AddMimeMapping(
".txt"
, 
"text/plain"
);
        
MimeMapping.AddMimeMapping(
".texinfo"
, 
"application/x-texinfo"
);
        
MimeMapping.AddMimeMapping(
".trm"
, 
"application/x-msterminal"
);
        
MimeMapping.AddMimeMapping(
".tiff"
, 
"image/tiff"
);
        
MimeMapping.AddMimeMapping(
".tcl"
, 
"application/x-tcl"
);
        
MimeMapping.AddMimeMapping(
".texi"
, 
"application/x-texinfo"
);
        
MimeMapping.AddMimeMapping(
".tsv"
, 
"text/tab-separated-values"
);
        
MimeMapping.AddMimeMapping(
".ustar"
, 
"application/x-ustar"
);
        
MimeMapping.AddMimeMapping(
".uls"
, 
"text/iuls"
);
        
MimeMapping.AddMimeMapping(
".vcf"
, 
"text/x-vcard"
);
        
MimeMapping.AddMimeMapping(
".wps"
, 
"application/vnd.ms-works"
);
        
MimeMapping.AddMimeMapping(
".wav"
, 
"audio/wav"
);
        
MimeMapping.AddMimeMapping(
".wrz"
, 
"x-world/x-vrml"
);
        
MimeMapping.AddMimeMapping(
".wri"
, 
"application/x-mswrite"
);
        
MimeMapping.AddMimeMapping(
".wks"
, 
"application/vnd.ms-works"
);
        
MimeMapping.AddMimeMapping(
".wmf"
, 
"application/x-msmetafile"
);
        
MimeMapping.AddMimeMapping(
".wcm"
, 
"application/vnd.ms-works"
);
        
MimeMapping.AddMimeMapping(
".wrl"
, 
"x-world/x-vrml"
);
        
MimeMapping.AddMimeMapping(
".wdb"
, 
"application/vnd.ms-works"
);
        
MimeMapping.AddMimeMapping(
".wsdl"
, 
"text/xml"
);
        
MimeMapping.AddMimeMapping(
".xap"
, 
"application/x-silverlight-app"
);
        
MimeMapping.AddMimeMapping(
".xml"
, 
"text/xml"
);
        
MimeMapping.AddMimeMapping(
".xlm"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xaf"
, 
"x-world/x-vrml"
);
        
MimeMapping.AddMimeMapping(
".xla"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xls"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xof"
, 
"x-world/x-vrml"
);
        
MimeMapping.AddMimeMapping(
".xlt"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xlc"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xsl"
, 
"text/xml"
);
        
MimeMapping.AddMimeMapping(
".xbm"
, 
"image/x-xbitmap"
);
        
MimeMapping.AddMimeMapping(
".xlw"
, 
"application/vnd.ms-excel"
);
        
MimeMapping.AddMimeMapping(
".xpm"
, 
"image/x-xpixmap"
);
        
MimeMapping.AddMimeMapping(
".xwd"
, 
"image/x-xwindowdump"
);
        
MimeMapping.AddMimeMapping(
".xsd"
, 
"text/xml"
);
        
MimeMapping.AddMimeMapping(
".z"
, 
"application/x-compress"
);
        
MimeMapping.AddMimeMapping(
".zip"
, 
"application/x-zip-compressed"
);
        
MimeMapping.AddMimeMapping(
".*"
, 
"application/octet-stream"
);
    
}
}
//需要调用的时候
string
file = 
@"MimeType.txt"
;
string
contentType = MimeMapping.GetMimeMapping(file);
Console。WriteLine(
"{0}'s MIME TYPE: {1}"
, file, contentType);
// ~~~~
         
       

code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235	`// 通过自己定义一个静态类` `// 将所有的Content Type都扔进去吧` `// 调用的时候直接调用静态方法即可。` `public` `static` `class` `MimeMapping` `{` `private` `static` `Hashtable _mimeMappingTable;` `private` `static` `void` `AddMimeMapping(` `string` `extension,` `string` `MimeType)` `{` `MimeMapping._mimeMappingTable.Add(extension, MimeType);` `}` `public` `static` `string` `GetMimeMapping(` `string` `FileName)` `{` `string` `text =` `null` `;` `int` `num = FileName.LastIndexOf(` `'.'` `);` `if` `(0 < num && num > FileName.LastIndexOf(` `'\\'` `))` `{` `text = (` `string` `)MimeMapping._mimeMappingTable[FileName.Substring(num)];` `}` `if` `(text ==` `null` `)` `{` `text = (` `string` `)MimeMapping._mimeMappingTable[` `"."` `];` `}` `return` `text;` `}` `static` `MimeMapping()` `{` `MimeMapping._mimeMappingTable =` `new` `Hashtable(190, StringComparer.CurrentCultureIgnoreCase);` `MimeMapping.AddMimeMapping(` `".323"` `,` `"text/h323"` `);` `MimeMapping.AddMimeMapping(` `".asx"` `,` `"video/x-ms-asf"` `);` `MimeMapping.AddMimeMapping(` `".acx"` `,` `"application/internet-property-stream"` `);` `MimeMapping.AddMimeMapping(` `".ai"` `,` `"application/postscript"` `);` `MimeMapping.AddMimeMapping(` `".aif"` `,` `"audio/x-aiff"` `);` `MimeMapping.AddMimeMapping(` `".aiff"` `,` `"audio/aiff"` `);` `MimeMapping.AddMimeMapping(` `".axs"` `,` `"application/olescript"` `);` `MimeMapping.AddMimeMapping(` `".aifc"` `,` `"audio/aiff"` `);` `MimeMapping.AddMimeMapping(` `".asr"` `,` `"video/x-ms-asf"` `);` `MimeMapping.AddMimeMapping(` `".avi"` `,` `"video/x-msvideo"` `);` `MimeMapping.AddMimeMapping(` `".asf"` `,` `"video/x-ms-asf"` `);` `MimeMapping.AddMimeMapping(` `".au"` `,` `"audio/basic"` `);` `MimeMapping.AddMimeMapping(` `".application"` `,` `"application/x-ms-application"` `);` `MimeMapping.AddMimeMapping(` `".bin"` `,` `"application/octet-stream"` `);` `MimeMapping.AddMimeMapping(` `".bas"` `,` `"text/plain"` `);` `MimeMapping.AddMimeMapping(` `".bcpio"` `,` `"application/x-bcpio"` `);` `MimeMapping.AddMimeMapping(` `".bmp"` `,` `"image/bmp"` `);` `MimeMapping.AddMimeMapping(` `".cdf"` `,` `"application/x-cdf"` `);` `MimeMapping.AddMimeMapping(` `".cat"` `,` `"application/vndms-pkiseccat"` `);` `MimeMapping.AddMimeMapping(` `".crt"` `,` `"application/x-x509-ca-cert"` `);` `MimeMapping.AddMimeMapping(` `".c"` `,` `"text/plain"` `);` `MimeMapping.AddMimeMapping(` `".css"` `,` `"text/css"` `);` `MimeMapping.AddMimeMapping(` `".cer"` `,` `"application/x-x509-ca-cert"` `);` `MimeMapping.AddMimeMapping(` `".crl"` `,` `"application/pkix-crl"` `);` `MimeMapping.AddMimeMapping(` `".cmx"` `,` `"image/x-cmx"` `);` `MimeMapping.AddMimeMapping(` `".csh"` `,` `"application/x-csh"` `);` `MimeMapping.AddMimeMapping(` `".cod"` `,` `"image/cis-cod"` `);` `MimeMapping.AddMimeMapping(` `".cpio"` `,` `"application/x-cpio"` `);` `MimeMapping.AddMimeMapping(` `".clp"` `,` `"application/x-msclip"` `);` `MimeMapping.AddMimeMapping(` `".crd"` `,` `"application/x-mscardfile"` `);` `MimeMapping.AddMimeMapping(` `".deploy"` `,` `"application/octet-stream"` `);` `MimeMapping.AddMimeMapping(` `".dll"` `,` `"application/x-msdownload"` `);` `MimeMapping.AddMimeMapping(` `".dot"` `,` `"application/msword"` `);` `MimeMapping.AddMimeMapping(` `".doc"` `,` `"application/msword"` `);` `MimeMapping.AddMimeMapping(` `".dvi"` `,` `"application/x-dvi"` `);` `MimeMapping.AddMimeMapping(` `".dir"` `,` `"application/x-director"` `);` `MimeMapping.AddMimeMapping(` `".dxr"` `,` `"application/x-director"` `);` `MimeMapping.AddMimeMapping(` `".der"` `,` `"application/x-x509-ca-cert"` `);` `MimeMapping.AddMimeMapping(` `".dib"` `,` `"image/bmp"` `);` `MimeMapping.AddMimeMapping(` `".dcr"` `,` `"application/x-director"` `);` `MimeMapping.AddMimeMapping(` `".disco"` `,` `"text/xml"` `);` `MimeMapping.AddMimeMapping(` `".exe"` `,` `"application/octet-stream"` `);` `MimeMapping.AddMimeMapping(` `".etx"` `,` `"text/x-setext"` `);` `MimeMapping.AddMimeMapping(` `".evy"` `,` `"application/envoy"` `);` `MimeMapping.AddMimeMapping(` `".eml"` `,` `"message/rfc822"` `);` `MimeMapping.AddMimeMapping(` `".eps"` `,` `"application/postscript"` `);` `MimeMapping.AddMimeMapping(` `".flr"` `,` `"x-world/x-vrml"` `);` `MimeMapping.AddMimeMapping(` `".fif"` `,` `"application/fractals"` `);` `MimeMapping.AddMimeMapping(` `".gtar"` `,` `"application/x-gtar"` `);` `MimeMapping.AddMimeMapping(` `".gif"` `,` `"image/gif"` `);` `MimeMapping.AddMimeMapping(` `".gz"` `,` `"application/x-gzip"` `);` `MimeMapping.AddMimeMapping(` `".hta"` `,` `"application/hta"` `);` `MimeMapping.AddMimeMapping(` `".htc"` `,` `"text/x-component"` `);` `MimeMapping.AddMimeMapping(` `".htt"` `,` `"text/webviewhtml"` `);` `MimeMapping.AddMimeMapping(` `".h"` `,` `"text/plain"` `);` `MimeMapping.AddMimeMapping(` `".hdf"` `,` `"application/x-hdf"` `);` `MimeMapping.AddMimeMapping(` `".hlp"` `,` `"application/winhlp"` `);` `MimeMapping.AddMimeMapping(` `".html"` `,` `"text/html"` `);` `MimeMapping.AddMimeMapping(` `".htm"` `,` `"text/html"` `);` `MimeMapping.AddMimeMapping(` `".hqx"` `,` `"application/mac-binhex40"` `);` `MimeMapping.AddMimeMapping(` `".isp"` `,` `"application/x-internet-signup"` `);` `MimeMapping.AddMimeMapping(` `".iii"` `,` `"application/x-iphone"` `);` `MimeMapping.AddMimeMapping(` `".ief"` `,` `"image/ief"` `);` `MimeMapping.AddMimeMapping(` `".ivf"` `,` `"video/x-ivf"` `);` `MimeMapping.AddMimeMapping(` `".ins"` `,` `"application/x-internet-signup"` `);` `MimeMapping.AddMimeMapping(` `".ico"` `,` `"image/x-icon"` `);` `MimeMapping.AddMimeMapping(` `".jpg"` `,` `"image/jpeg"` `);` `MimeMapping.AddMimeMapping(` `".jfif"` `,` `"image/pjpeg"` `);` `MimeMapping.AddMimeMapping(` `".jpe"` `,` `"image/jpeg"` `);` `MimeMapping.AddMimeMapping(` `".jpeg"` `,` `"image/jpeg"` `);` `MimeMapping.AddMimeMapping(` `".js"` `,` `"application/x-javascript"` `);` `MimeMapping.AddMimeMapping(` `".lsx"` `,` `"video/x-la-asf"` `);` `MimeMapping.AddMimeMapping(` `".latex"` `,` `"application/x-latex"` `);` `MimeMapping.AddMimeMapping(` `".lsf"` `,` `"video/x-la-asf"` `);` `MimeMapping.AddMimeMapping(` `".manifest"` `,` `"application/x-ms-manifest"` `);` `MimeMapping.AddMimeMapping(` `".mhtml"` `,` `"message/rfc822"` `);` `MimeMapping.AddMimeMapping(` `".mny"` `,` `"application/x-msmoney"` `);` `MimeMapping.AddMimeMapping(` `".mht"` `,` `"message/rfc822"` `);` `MimeMapping.AddMimeMapping(` `".mid"` `,` `"audio/mid"` `);` `MimeMapping.AddMimeMapping(` `".mpv2"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".man"` `,` `"application/x-troff-man"` `);` `MimeMapping.AddMimeMapping(` `".mvb"` `,` `"application/x-msmediaview"` `);` `MimeMapping.AddMimeMapping(` `".mpeg"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".m3u"` `,` `"audio/x-mpegurl"` `);` `MimeMapping.AddMimeMapping(` `".mdb"` `,` `"application/x-msaccess"` `);` `MimeMapping.AddMimeMapping(` `".mpp"` `,` `"application/vnd.ms-project"` `);` `MimeMapping.AddMimeMapping(` `".m1v"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".mpa"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".me"` `,` `"application/x-troff-me"` `);` `MimeMapping.AddMimeMapping(` `".m13"` `,` `"application/x-msmediaview"` `);` `MimeMapping.AddMimeMapping(` `".movie"` `,` `"video/x-sgi-movie"` `);` `MimeMapping.AddMimeMapping(` `".m14"` `,` `"application/x-msmediaview"` `);` `MimeMapping.AddMimeMapping(` `".mpe"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".mp2"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".mov"` `,` `"video/quicktime"` `);` `MimeMapping.AddMimeMapping(` `".mp3"` `,` `"audio/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".mpg"` `,` `"video/mpeg"` `);` `MimeMapping.AddMimeMapping(` `".ms"` `,` `"application/x-troff-ms"` `);` `MimeMapping.AddMimeMapping(` `".nc"` `,` `"application/x-netcdf"` `);` `MimeMapping.AddMimeMapping(` `".nws"` `,` `"message/rfc822"` `);` `MimeMapping.AddMimeMapping(` `".oda"` `,` `"application/oda"` `);` `MimeMapping.AddMimeMapping(` `".ods"` `,` `"application/oleobject"` `);` `MimeMapping.AddMimeMapping(` `".pmc"` `,` `"application/x-perfmon"` `);` `MimeMapping.AddMimeMapping(` `".p7r"` `,` `"application/x-pkcs7-certreqresp"` `);` `MimeMapping.AddMimeMapping(` `".p7b"` `,` `"application/x-pkcs7-certificates"` `);` `MimeMapping.AddMimeMapping(` `".p7s"` `,` `"application/pkcs7-signature"` `);` `MimeMapping.AddMimeMapping(` `".pmw"` `,` `"application/x-perfmon"` `);` `MimeMapping.AddMimeMapping(` `".ps"` `,` `"application/postscript"` `);` `MimeMapping.AddMimeMapping(` `".p7c"` `,` `"application/pkcs7-mime"` `);` `MimeMapping.AddMimeMapping(` `".pbm"` `,` `"image/x-portable-bitmap"` `);` `MimeMapping.AddMimeMapping(` `".ppm"` `,` `"image/x-portable-pixmap"` `);` `MimeMapping.AddMimeMapping(` `".pub"` `,` `"application/x-mspublisher"` `);` `MimeMapping.AddMimeMapping(` `".pnm"` `,` `"image/x-portable-anymap"` `);` `MimeMapping.AddMimeMapping(` `".png"` `,` `"image/png"` `);` `MimeMapping.AddMimeMapping(` `".pml"` `,` `"application/x-perfmon"` `);` `MimeMapping.AddMimeMapping(` `".p10"` `,` `"application/pkcs10"` `);` `MimeMapping.AddMimeMapping(` `".pfx"` `,` `"application/x-pkcs12"` `);` `MimeMapping.AddMimeMapping(` `".p12"` `,` `"application/x-pkcs12"` `);` `MimeMapping.AddMimeMapping(` `".pdf"` `,` `"application/pdf"` `);` `MimeMapping.AddMimeMapping(` `".pps"` `,` `"application/vnd.ms-powerpoint"` `);` `MimeMapping.AddMimeMapping(` `".p7m"` `,` `"application/pkcs7-mime"` `);` `MimeMapping.AddMimeMapping(` `".pko"` `,` `"application/vndms-pkipko"` `);` `MimeMapping.AddMimeMapping(` `".ppt"` `,` `"application/vnd.ms-powerpoint"` `);` `MimeMapping.AddMimeMapping(` `".pmr"` `,` `"application/x-perfmon"` `);` `MimeMapping.AddMimeMapping(` `".pma"` `,` `"application/x-perfmon"` `);` `MimeMapping.AddMimeMapping(` `".pot"` `,` `"application/vnd.ms-powerpoint"` `);` `MimeMapping.AddMimeMapping(` `".prf"` `,` `"application/pics-rules"` `);` `MimeMapping.AddMimeMapping(` `".pgm"` `,` `"image/x-portable-graymap"` `);` `MimeMapping.AddMimeMapping(` `".qt"` `,` `"video/quicktime"` `);` `MimeMapping.AddMimeMapping(` `".ra"` `,` `"audio/x-pn-realaudio"` `);` `MimeMapping.AddMimeMapping(` `".rgb"` `,` `"image/x-rgb"` `);` `MimeMapping.AddMimeMapping(` `".ram"` `,` `"audio/x-pn-realaudio"` `);` `MimeMapping.AddMimeMapping(` `".rmi"` `,` `"audio/mid"` `);` `MimeMapping.AddMimeMapping(` `".ras"` `,` `"image/x-cmu-raster"` `);` `MimeMapping.AddMimeMapping(` `".roff"` `,` `"application/x-troff"` `);` `MimeMapping.AddMimeMapping(` `".rtf"` `,` `"application/rtf"` `);` `MimeMapping.AddMimeMapping(` `".rtx"` `,` `"text/richtext"` `);` `MimeMapping.AddMimeMapping(` `".sv4crc"` `,` `"application/x-sv4crc"` `);` `MimeMapping.AddMimeMapping(` `".spc"` `,` `"application/x-pkcs7-certificates"` `);` `MimeMapping.AddMimeMapping(` `".setreg"` `,` `"application/set-registration-initiation"` `);` `MimeMapping.AddMimeMapping(` `".snd"` `,` `"audio/basic"` `);` `MimeMapping.AddMimeMapping(` `".stl"` `,` `"application/vndms-pkistl"` `);` `MimeMapping.AddMimeMapping(` `".setpay"` `,` `"application/set-payment-initiation"` `);` `MimeMapping.AddMimeMapping(` `".stm"` `,` `"text/html"` `);` `MimeMapping.AddMimeMapping(` `".shar"` `,` `"application/x-shar"` `);` `MimeMapping.AddMimeMapping(` `".sh"` `,` `"application/x-sh"` `);` `MimeMapping.AddMimeMapping(` `".sit"` `,` `"application/x-stuffit"` `);` `MimeMapping.AddMimeMapping(` `".spl"` `,` `"application/futuresplash"` `);` `MimeMapping.AddMimeMapping(` `".sct"` `,` `"text/scriptlet"` `);` `MimeMapping.AddMimeMapping(` `".scd"` `,` `"application/x-msschedule"` `);` `MimeMapping.AddMimeMapping(` `".sst"` `,` `"application/vndms-pkicertstore"` `);` `MimeMapping.AddMimeMapping(` `".src"` `,` `"application/x-wais-source"` `);` `MimeMapping.AddMimeMapping(` `".sv4cpio"` `,` `"application/x-sv4cpio"` `);` `MimeMapping.AddMimeMapping(` `".tex"` `,` `"application/x-tex"` `);` `MimeMapping.AddMimeMapping(` `".tgz"` `,` `"application/x-compressed"` `);` `MimeMapping.AddMimeMapping(` `".t"` `,` `"application/x-troff"` `);` `MimeMapping.AddMimeMapping(` `".tar"` `,` `"application/x-tar"` `);` `MimeMapping.AddMimeMapping(` `".tr"` `,` `"application/x-troff"` `);` `MimeMapping.AddMimeMapping(` `".tif"` `,` `"image/tiff"` `);` `MimeMapping.AddMimeMapping(` `".txt"` `,` `"text/plain"` `);` `MimeMapping.AddMimeMapping(` `".texinfo"` `,` `"application/x-texinfo"` `);` `MimeMapping.AddMimeMapping(` `".trm"` `,` `"application/x-msterminal"` `);` `MimeMapping.AddMimeMapping(` `".tiff"` `,` `"image/tiff"` `);` `MimeMapping.AddMimeMapping(` `".tcl"` `,` `"application/x-tcl"` `);` `MimeMapping.AddMimeMapping(` `".texi"` `,` `"application/x-texinfo"` `);` `MimeMapping.AddMimeMapping(` `".tsv"` `,` `"text/tab-separated-values"` `);` `MimeMapping.AddMimeMapping(` `".ustar"` `,` `"application/x-ustar"` `);` `MimeMapping.AddMimeMapping(` `".uls"` `,` `"text/iuls"` `);` `MimeMapping.AddMimeMapping(` `".vcf"` `,` `"text/x-vcard"` `);` `MimeMapping.AddMimeMapping(` `".wps"` `,` `"application/vnd.ms-works"` `);` `MimeMapping.AddMimeMapping(` `".wav"` `,` `"audio/wav"` `);` `MimeMapping.AddMimeMapping(` `".wrz"` `,` `"x-world/x-vrml"` `);` `MimeMapping.AddMimeMapping(` `".wri"` `,` `"application/x-mswrite"` `);` `MimeMapping.AddMimeMapping(` `".wks"` `,` `"application/vnd.ms-works"` `);` `MimeMapping.AddMimeMapping(` `".wmf"` `,` `"application/x-msmetafile"` `);` `MimeMapping.AddMimeMapping(` `".wcm"` `,` `"application/vnd.ms-works"` `);` `MimeMapping.AddMimeMapping(` `".wrl"` `,` `"x-world/x-vrml"` `);` `MimeMapping.AddMimeMapping(` `".wdb"` `,` `"application/vnd.ms-works"` `);` `MimeMapping.AddMimeMapping(` `".wsdl"` `,` `"text/xml"` `);` `MimeMapping.AddMimeMapping(` `".xap"` `,` `"application/x-silverlight-app"` `);` `MimeMapping.AddMimeMapping(` `".xml"` `,` `"text/xml"` `);` `MimeMapping.AddMimeMapping(` `".xlm"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xaf"` `,` `"x-world/x-vrml"` `);` `MimeMapping.AddMimeMapping(` `".xla"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xls"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xof"` `,` `"x-world/x-vrml"` `);` `MimeMapping.AddMimeMapping(` `".xlt"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xlc"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xsl"` `,` `"text/xml"` `);` `MimeMapping.AddMimeMapping(` `".xbm"` `,` `"image/x-xbitmap"` `);` `MimeMapping.AddMimeMapping(` `".xlw"` `,` `"application/vnd.ms-excel"` `);` `MimeMapping.AddMimeMapping(` `".xpm"` `,` `"image/x-xpixmap"` `);` `MimeMapping.AddMimeMapping(` `".xwd"` `,` `"image/x-xwindowdump"` `);` `MimeMapping.AddMimeMapping(` `".xsd"` `,` `"text/xml"` `);` `MimeMapping.AddMimeMapping(` `".z"` `,` `"application/x-compress"` `);` `MimeMapping.AddMimeMapping(` `".zip"` `,` `"application/x-zip-compressed"` `);` `MimeMapping.AddMimeMapping(` `"."` `,` `"application/octet-stream"` `);` `}` `}` `//需要调用的时候` `string` `file =` `@"MimeType.txt"` `;` `string` `contentType = MimeMapping.GetMimeMapping(file);` `Console。WriteLine(` `"{0}'s MIME TYPE: {1}"` `, file, contentType);` `// ~~~~`