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C#获取Content-Type(MIME Type)

zhangzongshan 人气:3

什么是ContentType?

我们知道浏览器可以处理各种各样的内容,比如:HTML、XML、JPG、Flash等等,那么浏览器是如何区分它们的呢?答案就是MIME Type,即资源的媒体类型。媒体类型通常是通过 HTTP 协议,由 Web 服务器告知浏览器的,更准确地说,是通过 Content-Type 来表示的,例如:

Content-Type:text/html;

这里简单说一下什么是Content-Type,详细内容自行到网上搜索。

查看完整的Http Content-Type对照表

C#获取文件的ContentType的方法

C#获取文件的ContentType有三种方法,下面分别介绍。

第一种,使用MimeMapping

使用.NET提供的现有方法是最简单的,但是需要.NET Framework 4.5及以后的支持。MimeMapping在System.Web命名空间下。

string fileName = "nmtree.png";
var contentType = MimeMapping.GetMimeMapping(fileName);
Console.WriteLine(contentType);

 第二种,通过注册表

本方法需要有访问注册表的权限。

public static string GetMimeMapping(string fileName)
{
    string mimeType = "application/octet-stream";
    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;
}

第三种,手动映射

这种方法在受到.NET版本和访问注册表权限时,是最佳解决方案,虽然代码看起来很多,不过下面的类直接拿走用就可以了。

public class FileContentType
 {
     private static IDictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) {
 
     #region Big freaking list of mime types
     // combination of values from Windows 7 Registry and
     // from C:\Windows\System32\inetsrv\config\applicationHost.config
     // some added, including .7z and .dat
     {".323", "text/h323"},
     {".3g2", "video/3gpp2"},
     {".3gp", "video/3gpp"},
     {".3gp2", "video/3gpp2"},
     {".3gpp", "video/3gpp"},
     {".7z", "application/x-7z-compressed"},
     {".aa", "audio/audible"},
     {".AAC", "audio/aac"},
     {".aaf", "application/octet-stream"},
     {".aax", "audio/vnd.audible.aax"},
     {".ac3", "audio/ac3"},
     {".aca", "application/octet-stream"},
     {".accda", "application/msaccess.addin"},
     {".accdb", "application/msaccess"},
     {".accdc", "application/msaccess.cab"},
     {".accde", "application/msaccess"},
     {".accdr", "application/msaccess.runtime"},
     {".accdt", "application/msaccess"},
     {".accdw", "application/msaccess.webapplication"},
     {".accft", "application/msaccess.ftemplate"},
     {".acx", "application/internet-property-stream"},
     {".AddIn", "text/xml"},
     {".ade", "application/msaccess"},
     {".adobebridge", "application/x-bridge-url"},
     {".adp", "application/msaccess"},
     {".ADT", "audio/vnd.dlna.adts"},
     {".ADTS", "audio/aac"},
     {".afm", "application/octet-stream"},
     {".ai", "application/postscript"},
     {".aif", "audio/x-aiff"},
     {".aifc", "audio/aiff"},
     {".aiff", "audio/aiff"},
     {".air", "application/vnd.adobe.air-application-installer-package+zip"},
     {".amc", "application/x-mpeg"},
     {".application", "application/x-ms-application"},
     {".art", "image/x-jg"},
     {".asa", "application/xml"},
     {".asax", "application/xml"},
     {".ascx", "application/xml"},
     {".asd", "application/octet-stream"},
     {".asf", "video/x-ms-asf"},
     {".ashx", "application/xml"},
     {".asi", "application/octet-stream"},
     {".asm", "text/plain"},
     {".asmx", "application/xml"},
     {".aspx", "application/xml"},
     {".asr", "video/x-ms-asf"},
     {".asx", "video/x-ms-asf"},
     {".atom", "application/atom+xml"},
     {".au", "audio/basic"},
     {".avi", "video/x-msvideo"},
     {".axs", "application/olescript"},
     {".bas", "text/plain"},
     {".bcpio", "application/x-bcpio"},
     {".bin", "application/octet-stream"},
     {".bmp", "image/bmp"},
     {".c", "text/plain"},
     {".cab", "application/octet-stream"},
     {".caf", "audio/x-caf"},
     {".calx", "application/vnd.ms-office.calx"},
     {".cat", "application/vnd.ms-pki.seccat"},
     {".cc", "text/plain"},
     {".cd", "text/plain"},
     {".cdda", "audio/aiff"},
     {".cdf", "application/x-cdf"},
     {".cer", "application/x-x509-ca-cert"},
     {".chm", "application/octet-stream"},
     {".class", "application/x-java-applet"},
     {".clp", "application/x-msclip"},
     {".cmx", "image/x-cmx"},
     {".cnf", "text/plain"},
     {".cod", "image/cis-cod"},
     {".config", "application/xml"},
     {".contact", "text/x-ms-contact"},
     {".coverage", "application/xml"},
     {".cpio", "application/x-cpio"},
     {".cpp", "text/plain"},
     {".crd", "application/x-mscardfile"},
     {".crl", "application/pkix-crl"},
     {".crt", "application/x-x509-ca-cert"},
     {".cs", "text/plain"},
     {".csdproj", "text/plain"},
     {".csh", "application/x-csh"},
     {".csproj", "text/plain"},
     {".css", "text/css"},
     {".csv", "text/csv"},
     {".cur", "application/octet-stream"},
     {".cxx", "text/plain"},
     {".dat", "application/octet-stream"},
     {".datasource", "application/xml"},
     {".dbproj", "text/plain"},
     {".dcr", "application/x-director"},
     {".def", "text/plain"},
     {".deploy", "application/octet-stream"},
     {".der", "application/x-x509-ca-cert"},
     {".dgml", "application/xml"},
     {".dib", "image/bmp"},
     {".dif", "video/x-dv"},
     {".dir", "application/x-director"},
     {".disco", "text/xml"},
     {".dll", "application/x-msdownload"},
     {".dll.config", "text/xml"},
     {".dlm", "text/dlm"},
     {".doc", "application/msword"},
     {".docm", "application/vnd.ms-word.document.macroEnabled.12"},
     {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
     {".dot", "application/msword"},
     {".dotm", "application/vnd.ms-word.template.macroEnabled.12"},
     {".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"},
     {".dsp", "application/octet-stream"},
     {".dsw", "text/plain"},
     {".dtd", "text/xml"},
     {".dtsConfig", "text/xml"},
     {".dv", "video/x-dv"},
     {".dvi", "application/x-dvi"},
     {".dwf", "drawing/x-dwf"},
     {".dwp", "application/octet-stream"},
     {".dxr", "application/x-director"},
     {".eml", "message/rfc822"},
     {".emz", "application/octet-stream"},
     {".eot", "application/octet-stream"},
     {".eps", "application/postscript"},
     {".etl", "application/etl"},
     {".etx", "text/x-setext"},
     {".evy", "application/envoy"},
     {".exe", "application/octet-stream"},
     {".exe.config", "text/xml"},
     {".fdf", "application/vnd.fdf"},
     {".fif", "application/fractals"},
     {".filters", "Application/xml"},
     {".fla", "application/octet-stream"},
     {".flr", "x-world/x-vrml"},
     {".flv", "video/x-flv"},
     {".fsscript", "application/fsharp-script"},
     {".fsx", "application/fsharp-script"},
     {".generictest", "application/xml"},
     {".gif", "image/gif"},
     {".group", "text/x-ms-group"},
     {".gsm", "audio/x-gsm"},
     {".gtar", "application/x-gtar"},
     {".gz", "application/x-gzip"},
     {".h", "text/plain"},
     {".hdf", "application/x-hdf"},
     {".hdml", "text/x-hdml"},
     {".hhc", "application/x-oleobject"},
     {".hhk", "application/octet-stream"},
     {".hhp", "application/octet-stream"},
     {".hlp", "application/winhlp"},
     {".hpp", "text/plain"},
     {".hqx", "application/mac-binhex40"},
     {".hta", "application/hta"},
     {".htc", "text/x-component"},
     {".htm", "text/html"},
     {".html", "text/html"},
     {".htt", "text/webviewhtml"},
     {".hxa", "application/xml"},
     {".hxc", "application/xml"},
     {".hxd", "application/octet-stream"},
     {".hxe", "application/xml"},
     {".hxf", "application/xml"},
     {".hxh", "application/octet-stream"},
     {".hxi", "application/octet-stream"},
     {".hxk", "application/xml"},
     {".hxq", "application/octet-stream"},
     {".hxr", "application/octet-stream"},
     {".hxs", "application/octet-stream"},
     {".hxt", "text/html"},
     {".hxv", "application/xml"},
     {".hxw", "application/octet-stream"},
     {".hxx", "text/plain"},
     {".i", "text/plain"},
     {".ico", "image/x-icon"},
     {".ics", "application/octet-stream"},
     {".idl", "text/plain"},
     {".ief", "image/ief"},
     {".iii", "application/x-iphone"},
     {".inc", "text/plain"},
     {".inf", "application/octet-stream"},
     {".inl", "text/plain"},
     {".ins", "application/x-internet-signup"},
     {".ipa", "application/x-itunes-ipa"},
     {".ipg", "application/x-itunes-ipg"},
     {".ipproj", "text/plain"},
     {".ipsw", "application/x-itunes-ipsw"},
     {".iqy", "text/x-ms-iqy"},
     {".isp", "application/x-internet-signup"},
     {".ite", "application/x-itunes-ite"},
     {".itlp", "application/x-itunes-itlp"},
     {".itms", "application/x-itunes-itms"},
     {".itpc", "application/x-itunes-itpc"},
     {".IVF", "video/x-ivf"},
     {".jar", "application/java-archive"},
     {".java", "application/octet-stream"},
     {".jck", "application/liquidmotion"},
     {".jcz", "application/liquidmotion"},
     {".jfif", "image/pjpeg"},
     {".jnlp", "application/x-java-jnlp-file"},
     {".jpb", "application/octet-stream"},
     {".jpe", "image/jpeg"},
     {".jpeg", "image/jpeg"},
     {".jpg", "image/jpeg"},
     {".js", "application/x-javascript"},
     {".jsx", "text/jscript"},
     {".jsxbin", "text/plain"},
     {".latex", "application/x-latex"},
     {".library-ms", "application/windows-library+xml"},
     {".lit", "application/x-ms-reader"},
     {".loadtest", "application/xml"},
     {".lpk", "application/octet-stream"},
     {".lsf", "video/x-la-asf"},
     {".lst", "text/plain"},
     {".lsx", "video/x-la-asf"},
     {".lzh", "application/octet-stream"},
     {".m13", "application/x-msmediaview"},
     {".m14", "application/x-msmediaview"},
     {".m1v", "video/mpeg"},
     {".m2t", "video/vnd.dlna.mpeg-tts"},
     {".m2ts", "video/vnd.dlna.mpeg-tts"},
     {".m2v", "video/mpeg"},
     {".m3u", "audio/x-mpegurl"},
     {".m3u8", "audio/x-mpegurl"},
     {".m4a", "audio/m4a"},
     {".m4b", "audio/m4b"},
     {".m4p", "audio/m4p"},
     {".m4r", "audio/x-m4r"},
     {".m4v", "video/x-m4v"},
     {".mac", "image/x-macpaint"},
     {".mak", "text/plain"},
     {".man", "application/x-troff-man"},
     {".manifest", "application/x-ms-manifest"},
     {".map", "text/plain"},
     {".master", "application/xml"},
     {".mda", "application/msaccess"},
     {".mdb", "application/x-msaccess"},
     {".mde", "application/msaccess"},
     {".mdp", "application/octet-stream"},
     {".me", "application/x-troff-me"},
     {".mfp", "application/x-shockwave-flash"},
     {".mht", "message/rfc822"},
     {".mhtml", "message/rfc822"},
     {".mid", "audio/mid"},
     {".midi", "audio/mid"},
     {".mix", "application/octet-stream"},
     {".mk", "text/plain"},
     {".mmf", "application/x-smaf"},
     {".mno", "text/xml"},
     {".mny", "application/x-msmoney"},
     {".mod", "video/mpeg"},
     {".mov", "video/quicktime"},
     {".movie", "video/x-sgi-movie"},
     {".mp2", "video/mpeg"},
     {".mp2v", "video/mpeg"},
     {".mp3", "audio/mpeg"},
     {".mp4", "video/mp4"},
     {".mp4v", "video/mp4"},
     {".mpa", "video/mpeg"},
     {".mpe", "video/mpeg"},
     {".mpeg", "video/mpeg"},
     {".mpf", "application/vnd.ms-mediapackage"},
     {".mpg", "video/mpeg"},
     {".mpp", "application/vnd.ms-project"},
     {".mpv2", "video/mpeg"},
     {".mqv", "video/quicktime"},
     {".ms", "application/x-troff-ms"},
     {".msi", "application/octet-stream"},
     {".mso", "application/octet-stream"},
     {".mts", "video/vnd.dlna.mpeg-tts"},
     {".mtx", "application/xml"},
     {".mvb", "application/x-msmediaview"},
     {".mvc", "application/x-miva-compiled"},
     {".mxp", "application/x-mmxp"},
     {".nc", "application/x-netcdf"},
     {".nsc", "video/x-ms-asf"},
     {".nws", "message/rfc822"},
     {".ocx", "application/octet-stream"},
     {".oda", "application/oda"},
     {".odc", "text/x-ms-odc"},
     {".odh", "text/plain"},
     {".odl", "text/plain"},
     {".odp", "application/vnd.oasis.opendocument.presentation"},
     {".ods", "application/oleobject"},
     {".odt", "application/vnd.oasis.opendocument.text"},
     {".one", "application/onenote"},
     {".onea", "application/onenote"},
     {".onepkg", "application/onenote"},
     {".onetmp", "application/onenote"},
     {".onetoc", "application/onenote"},
     {".onetoc2", "application/onenote"},
     {".orderedtest", "application/xml"},
     {".osdx", "application/opensearchdescription+xml"},
     {".p10", "application/pkcs10"},
     {".p12", "application/x-pkcs12"},
     {".p7b", "application/x-pkcs7-certificates"},
     {".p7c", "application/pkcs7-mime"},
     {".p7m", "application/pkcs7-mime"},
     {".p7r", "application/x-pkcs7-certreqresp"},
     {".p7s", "application/pkcs7-signature"},
     {".pbm", "image/x-portable-bitmap"},
     {".pcast", "application/x-podcast"},
     {".pct", "image/pict"},
     {".pcx", "application/octet-stream"},
     {".pcz", "application/octet-stream"},
     {".pdf", "application/pdf"},
     {".pfb", "application/octet-stream"},
     {".pfm", "application/octet-stream"},
     {".pfx", "application/x-pkcs12"},
     {".pgm", "image/x-portable-graymap"},
     {".pic", "image/pict"},
     {".pict", "image/pict"},
     {".pkgdef", "text/plain"},
     {".pkgundef", "text/plain"},
     {".pko", "application/vnd.ms-pki.pko"},
     {".pls", "audio/scpls"},
     {".pma", "application/x-perfmon"},
     {".pmc", "application/x-perfmon"},
     {".pml", "application/x-perfmon"},
     {".pmr", "application/x-perfmon"},
     {".pmw", "application/x-perfmon"},
     {".png", "image/png"},
     {".pnm", "image/x-portable-anymap"},
     {".pnt", "image/x-macpaint"},
     {".pntg", "image/x-macpaint"},
     {".pnz", "image/png"},
     {".pot", "application/vnd.ms-powerpoint"},
     {".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"},
     {".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"},
     {".ppa", "application/vnd.ms-powerpoint"},
     {".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"},
     {".ppm", "image/x-portable-pixmap"},
     {".pps", "application/vnd.ms-powerpoint"},
     {".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"},
     {".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"},
     {".ppt", "application/vnd.ms-powerpoint"},
     {".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"},
     {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
     {".prf", "application/pics-rules"},
     {".prm", "application/octet-stream"},
     {".prx", "application/octet-stream"},
     {".ps", "application/postscript"},
     {".psc1", "application/PowerShell"},
     {".psd", "application/octet-stream"},
     {".psess", "application/xml"},
     {".psm", "application/octet-stream"},
     {".psp", "application/octet-stream"},
     {".pub", "application/x-mspublisher"},
     {".pwz", "application/vnd.ms-powerpoint"},
     {".qht", "text/x-html-insertion"},
     {".qhtm", "text/x-html-insertion"},
     {".qt", "video/quicktime"},
     {".qti", "image/x-quicktime"},
     {".qtif", "image/x-quicktime"},
     {".qtl", "application/x-quicktimeplayer"},
     {".qxd", "application/octet-stream"},
     {".ra", "audio/x-pn-realaudio"},
     {".ram", "audio/x-pn-realaudio"},
     {".rar", "application/octet-stream"},
     {".ras", "image/x-cmu-raster"},
     {".rat", "application/rat-file"},
     {".rc", "text/plain"},
     {".rc2", "text/plain"},
     {".rct", "text/plain"},
     {".rdlc", "application/xml"},
     {".resx", "application/xml"},
     {".rf", "image/vnd.rn-realflash"},
     {".rgb", "image/x-rgb"},
     {".rgs", "text/plain"},
     {".rm", "application/vnd.rn-realmedia"},
     {".rmi", "audio/mid"},
     {".rmp", "application/vnd.rn-rn_music_package"},
     {".roff", "application/x-troff"},
     {".rpm", "audio/x-pn-realaudio-plugin"},
     {".rqy", "text/x-ms-rqy"},
     {".rtf", "application/rtf"},
     {".rtx", "text/richtext"},
     {".ruleset", "application/xml"},
     {".s", "text/plain"},
     {".safariextz", "application/x-safari-safariextz"},
     {".scd", "application/x-msschedule"},
     {".sct", "text/scriptlet"},
     {".sd2", "audio/x-sd2"},
     {".sdp", "application/sdp"},
     {".sea", "application/octet-stream"},
     {".searchConnector-ms", "application/windows-search-connector+xml"},
     {".setpay", "application/set-payment-initiation"},
     {".setreg", "application/set-registration-initiation"},
     {".settings", "application/xml"},
     {".sgimb", "application/x-sgimb"},
     {".sgml", "text/sgml"},
     {".sh", "application/x-sh"},
     {".shar", "application/x-shar"},
     {".shtml", "text/html"},
     {".sit", "application/x-stuffit"},
     {".sitemap", "application/xml"},
     {".skin", "application/xml"},
     {".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12"},
     {".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"},
     {".slk", "application/vnd.ms-excel"},
     {".sln", "text/plain"},
     {".slupkg-ms", "application/x-ms-license"},
     {".smd", "audio/x-smd"},
     {".smi", "application/octet-stream"},
     {".smx", "audio/x-smd"},
     {".smz", "audio/x-smd"},
     {".snd", "audio/basic"},
     {".snippet", "application/xml"},
     {".snp", "application/octet-stream"},
     {".sol", "text/plain"},
     {".sor", "text/plain"},
     {".spc", "application/x-pkcs7-certificates"},
     {".spl", "application/futuresplash"},
     {".src", "application/x-wais-source"},
     {".srf", "text/plain"},
     {".SSISDeploymentManifest", "text/xml"},
     {".ssm", "application/streamingmedia"},
     {".sst", "application/vnd.ms-pki.certstore"},
     {".stl", "application/vnd.ms-pki.stl"},
     {".sv4cpio", "application/x-sv4cpio"},
     {".sv4crc", "application/x-sv4crc"},
     {".svc", "application/xml"},
     {".swf", "application/x-shockwave-flash"},
     {".t", "application/x-troff"},
     {".tar", "application/x-tar"},
     {".tcl", "application/x-tcl"},
     {".testrunconfig", "application/xml"},
     {".testsettings", "application/xml"},
     {".tex", "application/x-tex"},
     {".texi", "application/x-texinfo"},
     {".texinfo", "application/x-texinfo"},
     {".tgz", "application/x-compressed"},
     {".thmx", "application/vnd.ms-officetheme"},
     {".thn", "application/octet-stream"},
     {".tif", "image/tiff"},
     {".tiff", "image/tiff"},
     {".tlh", "text/plain"},
     {".tli", "text/plain"},
     {".toc", "application/octet-stream"},
     {".tr", "application/x-troff"},
     {".trm", "application/x-msterminal"},
     {".trx", "application/xml"},
     {".ts", "video/vnd.dlna.mpeg-tts"},
     {".tsv", "text/tab-separated-values"},
     {".ttf", "application/octet-stream"},
     {".tts", "video/vnd.dlna.mpeg-tts"},
     {".txt", "text/plain"},
     {".u32", "application/octet-stream"},
     {".uls", "text/iuls"},
     {".user", "text/plain"},
     {".ustar", "application/x-ustar"},
     {".vb", "text/plain"},
     {".vbdproj", "text/plain"},
     {".vbk", "video/mpeg"},
     {".vbproj", "text/plain"},
     {".vbs", "text/vbscript"},
     {".vcf", "text/x-vcard"},
     {".vcproj", "Application/xml"},
     {".vcs", "text/plain"},
     {".vcxproj", "Application/xml"},
     {".vddproj", "text/plain"},
     {".vdp", "text/plain"},
     {".vdproj", "text/plain"},
     {".vdx", "application/vnd.ms-visio.viewer"},
     {".vml", "text/xml"},
     {".vscontent", "application/xml"},
     {".vsct", "text/xml"},
     {".vsd", "application/vnd.visio"},
     {".vsi", "application/ms-vsi"},
     {".vsix", "application/vsix"},
     {".vsixlangpack", "text/xml"},
     {".vsixmanifest", "text/xml"},
     {".vsmdi", "application/xml"},
     {".vspscc", "text/plain"},
     {".vss", "application/vnd.visio"},
     {".vsscc", "text/plain"},
     {".vssettings", "text/xml"},
     {".vssscc", "text/plain"},
     {".vst", "application/vnd.visio"},
     {".vstemplate", "text/xml"},
     {".vsto", "application/x-ms-vsto"},
     {".vsw", "application/vnd.visio"},
     {".vsx", "application/vnd.visio"},
     {".vtx", "application/vnd.visio"},
     {".wav", "audio/wav"},
     {".wave", "audio/wav"},
     {".wax", "audio/x-ms-wax"},
     {".wbk", "application/msword"},
     {".wbmp", "image/vnd.wap.wbmp"},
     {".wcm", "application/vnd.ms-works"},
     {".wdb", "application/vnd.ms-works"},
     {".wdp", "image/vnd.ms-photo"},
     {".webarchive", "application/x-safari-webarchive"},
     {".webtest", "application/xml"},
     {".wiq", "application/xml"},
     {".wiz", "application/msword"},
     {".wks", "application/vnd.ms-works"},
     {".WLMP", "application/wlmoviemaker"},
     {".wlpginstall", "application/x-wlpg-detect"},
     {".wlpginstall3", "application/x-wlpg3-detect"},
     {".wm", "video/x-ms-wm"},
     {".wma", "audio/x-ms-wma"},
     {".wmd", "application/x-ms-wmd"},
     {".wmf", "application/x-msmetafile"},
     {".wml", "text/vnd.wap.wml"},
     {".wmlc", "application/vnd.wap.wmlc"},
     {".wmls", "text/vnd.wap.wmlscript"},
     {".wmlsc", "application/vnd.wap.wmlscriptc"},
     {".wmp", "video/x-ms-wmp"},
     {".wmv", "video/x-ms-wmv"},
     {".wmx", "video/x-ms-wmx"},
     {".wmz", "application/x-ms-wmz"},
     {".wpl", "application/vnd.ms-wpl"},
     {".wps", "application/vnd.ms-works"},
     {".wri", "application/x-mswrite"},
     {".wrl", "x-world/x-vrml"},
     {".wrz", "x-world/x-vrml"},
     {".wsc", "text/scriptlet"},
     {".wsdl", "text/xml"},
     {".wvx", "video/x-ms-wvx"},
     {".x", "application/directx"},
     {".xaf", "x-world/x-vrml"},
     {".xaml", "application/xaml+xml"},
     {".xap", "application/x-silverlight-app"},
     {".xbap", "application/x-ms-xbap"},
     {".xbm", "image/x-xbitmap"},
     {".xdr", "text/plain"},
     {".xht", "application/xhtml+xml"},
     {".xhtml", "application/xhtml+xml"},
     {".xla", "application/vnd.ms-excel"},
     {".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"},
     {".xlc", "application/vnd.ms-excel"},
     {".xld", "application/vnd.ms-excel"},
     {".xlk", "application/vnd.ms-excel"},
     {".xll", "application/vnd.ms-excel"},
     {".xlm", "application/vnd.ms-excel"},
     {".xls", "application/vnd.ms-excel"},
     {".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"},
     {".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"},
     {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
     {".xlt", "application/vnd.ms-excel"},
     {".xltm", "application/vnd.ms-excel.template.macroEnabled.12"},
     {".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"},
     {".xlw", "application/vnd.ms-excel"},
     {".xml", "text/xml"},
     {".xmta", "application/xml"},
     {".xof", "x-world/x-vrml"},
     {".XOML", "text/plain"},
     {".xpm", "image/x-xpixmap"},
     {".xps", "application/vnd.ms-xpsdocument"},
     {".xrm-ms", "text/xml"},
     {".xsc", "application/xml"},
     {".xsd", "text/xml"},
     {".xsf", "text/xml"},
     {".xsl", "text/xml"},
     {".xslt", "text/xml"},
     {".xsn", "application/octet-stream"},
     {".xss", "application/xml"},
     {".xtp", "application/octet-stream"},
     {".xwd", "image/x-xwindowdump"},
     {".z", "application/x-compress"},
     {".zip", "application/x-zip-compressed"},
     #endregion
 
     };
 
     public static string GetMimeType(string extension)
     {
         if (extension == null)
         {
             throw new ArgumentNullException("extension");
         }
 
         if (!extension.StartsWith("."))
         {
             extension = "." + extension;
         }
 
         string mime;
 
         return _mappings.TryGetValue(extension, out mime) ? mime :"application/octet-stream";
     }
 }

上面获取Content-Type的三种方法各有利弊,要根据不同的使用环境选择。

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