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。
|
1
2
3
|
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。
|
1
2
3
4
5
6
7
8
9
10
11
|
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:WindowsSystem32inetsrvconfigapplicationHost.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"; } }