男儿欲遂平生志，五经勤向窗前读。这篇文章主要讲述NetCore MimeMapping获取MIME相关的知识，希望能为你提供帮助。
原文:NetCore MimeMapping获取MIME【NetCore MimeMapping获取MIME】

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public static class MimeMapping { private abstract class MimeMappingDictionaryBase { private readonly Dictionary< string, string> _mappings = new Dictionary< string, string> (StringComparer.OrdinalIgnoreCase); private static readonly char[] _pathSeparatorChars = new char[3] { Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar, Path.VolumeSeparatorChar }; private bool _isInitialized; protected void AddMapping(string fileExtension, string mimeType) { _mappings.Add(fileExtension, mimeType); }private void AddWildcardIfNotPresent() { if (!_mappings.ContainsKey(".*")) { AddMapping(".*", "application/octet-stream"); } }private void EnsureMapping() { if (!_isInitialized) { lock (this) { if (!_isInitialized) { PopulateMappings(); AddWildcardIfNotPresent(); _isInitialized = true; } } } }protected abstract void PopulateMappings(); private static string GetFileName(string path) { int num = path.LastIndexOfAny(_pathSeparatorChars); if (num < 0) { return path; } return path.Substring(num); }public string GetMimeMapping(string fileName) { EnsureMapping(); fileName = GetFileName(fileName); for (int i = 0; i < fileName.Length; i++) { if (fileName[i] == ‘.‘ & & _mappings.TryGetValue(fileName.Substring(i), out string result)) { return result; } } return _mappings[".*"]; } }private sealed class MimeMappingDictionaryClassic : MimeMappingDictionaryBase { protected override void PopulateMappings() { base.AddMapping(".323", "text/h323"); base.AddMapping(".aaf", "application/octet-stream"); base.AddMapping(".aca", "application/octet-stream"); base.AddMapping(".accdb", "application/msaccess"); base.AddMapping(".accde", "application/msaccess"); base.AddMapping(".accdt", "application/msaccess"); base.AddMapping(".acx", "application/internet-property-stream"); base.AddMapping(".afm", "application/octet-stream"); base.AddMapping(".ai", "application/postscript"); base.AddMapping(".aif", "audio/x-aiff"); base.AddMapping(".aifc", "audio/aiff"); base.AddMapping(".aiff", "audio/aiff"); base.AddMapping(".application", "application/x-ms-application"); base.AddMapping(".art", "image/x-jg"); base.AddMapping(".asd", "application/octet-stream"); base.AddMapping(".asf", "video/x-ms-asf"); base.AddMapping(".asi", "application/octet-stream"); base.AddMapping(".asm", "text/plain"); base.AddMapping(".asr", "video/x-ms-asf"); base.AddMapping(".asx", "video/x-ms-asf"); base.AddMapping(".atom", "application/atom+xml"); base.AddMapping(".au", "audio/basic"); base.AddMapping(".avi", "video/x-msvideo"); base.AddMapping(".axs", "application/olescript"); base.AddMapping(".bas", "text/plain"); base.AddMapping(".bcpio", "application/x-bcpio"); base.AddMapping(".bin", "application/octet-stream"); base.AddMapping(".bmp", "image/bmp"); base.AddMapping(".c", "text/plain"); base.AddMapping(".cab", "application/octet-stream"); base.AddMapping(".calx", "application/vnd.ms-office.calx"); base.AddMapping(".cat", "application/vnd.ms-pki.seccat"); base.AddMapping(".cdf", "application/x-cdf"); base.AddMapping(".chm", "application/octet-stream"); base.AddMapping(".class", "application/x-java-applet"); base.AddMapping(".clp", "application/x-msclip"); base.AddMapping(".cmx", "image/x-cmx"); base.AddMapping(".cnf", "text/plain"); base.AddMapping(".cod", "image/cis-cod"); base.AddMapping(".cpio", "application/x-cpio"); base.AddMapping(".cpp", "text/plain"); base.AddMapping(".crd", "application/x-mscardfile"); base.AddMapping(".crl", "application/pkix-crl"); base.AddMapping(".crt", "application/x-x509-ca-cert"); base.AddMapping(".csh", "application/x-csh"); base.AddMapping(".css", "text/css"); base.AddMapping(".csv", "application/octet-stream"); base.AddMapping(".cur", "application/octet-stream"); base.AddMapping(".dcr", "application/x-director"); base.AddMapping(".deploy", "application/octet-stream"); base.AddMapping(".der", "application/x-x509-ca-cert"); base.AddMapping(".dib", "image/bmp"); base.AddMapping(".dir", "application/x-director"); base.AddMapping(".disco", "text/xml"); base.AddMapping(".dll", "application/x-msdownload"); base.AddMapping(".dll.config", "text/xml"); base.AddMapping(".dlm", "text/dlm"); base.AddMapping(".doc", "application/msword"); base.AddMapping(".docm", "application/vnd.ms-word.document.macroEnabled.12"); base.AddMapping(".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"); base.AddMapping(".dot", "application/msword"); base.AddMapping(".dotm", "application/vnd.ms-word.template.macroEnabled.12"); base.AddMapping(".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"); base.AddMapping(".dsp", "application/octet-stream"); base.AddMapping(".dtd", "text/xml"); base.AddMapping(".dvi", "application/x-dvi"); base.AddMapping(".dwf", "drawing/x-dwf"); base.AddMapping(".dwp", "application/octet-stream"); base.AddMapping(".dxr", "application/x-director"); base.AddMapping(".eml", "message/rfc822"); base.AddMapping(".emz", "application/octet-stream"); base.AddMapping(".eot", "application/octet-stream"); base.AddMapping(".eps", "application/postscript"); base.AddMapping(".etx", "text/x-setext"); base.AddMapping(".evy", "application/envoy"); base.AddMapping(".exe", "application/octet-stream"); base.AddMapping(".exe.config", "text/xml"); base.AddMapping(".fdf", "application/vnd.fdf"); base.AddMapping(".fif", "application/fractals"); base.AddMapping(".fla", "application/octet-stream"); base.AddMapping(".flr", "x-world/x-vrml"); base.AddMapping(".flv", "video/x-flv"); base.AddMapping(".gif", "image/gif"); base.AddMapping(".gtar", "application/x-gtar"); base.AddMapping(".gz", "application/x-gzip"); base.AddMapping(".h", "text/plain"); base.AddMapping(".hdf", "application/x-hdf"); base.AddMapping(".hdml", "text/x-hdml"); base.AddMapping(".hhc", "application/x-oleobject"); base.AddMapping(".hhk", "application/octet-stream"); base.AddMapping(".hhp", "application/octet-stream"); base.AddMapping(".hlp", "application/winhlp"); base.AddMapping(".hqx", "application/mac-binhex40"); base.AddMapping(".hta", "application/hta"); base.AddMapping(".htc", "text/x-component"); base.AddMapping(".htm", "text/html"); base.AddMapping(".html", "text/html"); base.AddMapping(".htt", "text/webviewhtml"); base.AddMapping(".hxt", "text/html"); base.AddMapping(".ico", "image/x-icon"); base.AddMapping(".ics", "application/octet-stream"); base.AddMapping(".ief", "image/ief"); base.AddMapping(".iii", "application/x-iphone"); base.AddMapping(".inf", "application/octet-stream"); base.AddMapping(".ins", "application/x-internet-signup"); base.AddMapping(".isp", "application/x-internet-signup"); base.AddMapping(".IVF", "video/x-ivf"); base.AddMapping(".jar", "application/java-archive"); base.AddMapping(".java", "application/octet-stream"); base.AddMapping(".jck", "application/liquidmotion"); base.AddMapping(".jcz", "application/liquidmotion"); base.AddMapping(".jfif", "image/pjpeg"); base.AddMapping(".jpb", "application/octet-stream"); base.AddMapping(".jpe", "image/jpeg"); base.AddMapping(".jpeg", "image/jpeg"); base.AddMapping(".jpg", "image/jpeg"); base.AddMapping(".js", "application/x-javascript"); base.AddMapping(".jsx", "text/jscript"); base.AddMapping(".latex", "application/x-latex"); base.AddMapping(".lit", "application/x-ms-reader"); base.AddMapping(".lpk", "application/octet-stream"); base.AddMapping(".lsf", "video/x-la-asf"); base.AddMapping(".lsx", "video/x-la-asf"); base.AddMapping(".lzh", "application/octet-stream"); base.AddMapping(".m13", "application/x-msmediaview"); base.AddMapping(".m14", "application/x-msmediaview"); base.AddMapping(".m1v", "video/mpeg"); base.AddMapping(".m3u", "audio/x-mpegurl"); base.AddMapping(".man", "application/x-troff-man"); base.AddMapping(".manifest", "application/x-ms-manifest"); base.AddMapping(".map", "text/plain"); base.AddMapping(".mdb", "application/x-msaccess"); base.AddMapping(".mdp", "application/octet-stream"); base.AddMapping(".me", "application/x-troff-me"); base.AddMapping(".mht", "message/rfc822"); base.AddMapping(".mhtml", "message/rfc822"); base.AddMapping(".mid", "audio/mid"); base.AddMapping(".midi", "audio/mid"); base.AddMapping(".mix", "application/octet-stream"); base.AddMapping(".mmf", "application/x-smaf"); base.AddMapping(".mno", "text/xml"); base.AddMapping(".mny", "application/x-msmoney"); base.AddMapping(".mov", "video/quicktime"); base.AddMapping(".movie", "video/x-sgi-movie"); base.AddMapping(".mp2", "video/mpeg"); base.AddMapping(".mp3", "audio/mpeg"); base.AddMapping(".mpa", "video/mpeg"); base.AddMapping(".mpe", "video/mpeg"); base.AddMapping(".mpeg", "video/mpeg"); base.AddMapping(".mpg", "video/mpeg"); base.AddMapping(".mpp", "application/vnd.ms-project"); base.AddMapping(".mpv2", "video/mpeg"); base.AddMapping(".ms", "application/x-troff-ms"); base.AddMapping(".msi", "application/octet-stream"); base.AddMapping(".mso", "application/octet-stream"); base.AddMapping(".mvb", "application/x-msmediaview"); base.AddMapping(".mvc", "application/x-miva-compiled"); base.AddMapping(".nc", "application/x-netcdf"); base.AddMapping(".nsc", "video/x-ms-asf"); base.AddMapping(".nws", "message/rfc822"); base.AddMapping(".ocx", "application/octet-stream"); base.AddMapping(".oda", "application/oda"); base.AddMapping(".odc", "text/x-ms-odc"); base.AddMapping(".ods", "application/oleobject"); base.AddMapping(".one", "application/onenote"); base.AddMapping(".onea", "application/onenote"); base.AddMapping(".onetoc", "application/onenote"); base.AddMapping(".onetoc2", "application/onenote"); base.AddMapping(".onetmp", "application/onenote"); base.AddMapping(".onepkg", "application/onenote"); base.AddMapping(".osdx", "application/opensearchdescription+xml"); base.AddMapping(".p10", "application/pkcs10"); base.AddMapping(".p12", "application/x-pkcs12"); base.AddMapping(".p7b", "application/x-pkcs7-certificates"); base.AddMapping(".p7c", "application/pkcs7-mime"); base.AddMapping(".p7m", "application/pkcs7-mime"); base.AddMapping(".p7r", "application/x-pkcs7-certreqresp"); base.AddMapping(".p7s", "application/pkcs7-signature"); base.AddMapping(".pbm", "image/x-portable-bitmap"); base.AddMapping(".pcx", "application/octet-stream"); base.AddMapping(".pcz", "application/octet-stream"); base.AddMapping(".pdf", "application/pdf"); base.AddMapping(".pfb", "application/octet-stream"); base.AddMapping(".pfm", "application/octet-stream"); base.AddMapping(".pfx", "application/x-pkcs12"); base.AddMapping(".pgm", "image/x-portable-graymap"); base.AddMapping(".pko", "application/vnd.ms-pki.pko"); base.AddMapping(".pma", "application/x-perfmon"); base.AddMapping(".pmc", "application/x-perfmon"); base.AddMapping(".pml", "application/x-perfmon"); base.AddMapping(".pmr", "application/x-perfmon"); base.AddMapping(".pmw", "application/x-perfmon"); base.AddMapping(".png", "image/png"); base.AddMapping(".pnm", "image/x-portable-anymap"); base.AddMapping(".pnz", "image/png"); base.AddMapping(".pot", "application/vnd.ms-powerpoint"); base.AddMapping(".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12"); base.AddMapping(".potx", "application/vnd.openxmlformats-officedocument.presentationml.template"); base.AddMapping(".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"); base.AddMapping(".ppm", "image/x-portable-pixmap"); base.AddMapping(".pps", "application/vnd.ms-powerpoint"); base.AddMapping(".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"); base.AddMapping(".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"); base.AddMapping(".ppt", "application/vnd.ms-powerpoint"); base.AddMapping(".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"); base.AddMapping(".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"); base.AddMapping(".prf", "application/pics-rules"); base.AddMapping(".prm", "application/octet-stream"); base.AddMapping(".prx", "application/octet-stream"); base.AddMapping(".ps", "application/postscript"); base.AddMapping(".psd", "application/octet-stream"); base.AddMapping(".psm", "application/octet-stream"); base.AddMapping(".psp", "application/octet-stream"); base.AddMapping(".pub", "application/x-mspublisher"); base.AddMapping(".qt", "video/quicktime"); base.AddMapping(".qtl", "application/x-quicktimeplayer"); base.AddMapping(".qxd", "application/octet-stream"); base.AddMapping(".ra", "audio/x-pn-realaudio"); base.AddMapping(".ram", "audio/x-pn-realaudio"); base.AddMapping(".rar", "application/octet-stream"); base.AddMapping(".ras", "image/x-cmu-raster"); base.AddMapping(".rf", "image/vnd.rn-realflash"); base.AddMapping(".rgb", "image/x-rgb"); base.AddMapping(".rm", "application/vnd.rn-realmedia"); base.AddMapping(".rmi", "audio/mid"); base.AddMapping(".roff", "application/x-troff"); base.AddMapping(".rpm", "audio/x-pn-realaudio-plugin"); base.AddMapping(".rtf", "application/rtf"); base.AddMapping(".rtx", "text/richtext"); base.AddMapping(".scd", "application/x-msschedule"); base.AddMapping(".sct", "text/scriptlet"); base.AddMapping(".sea", "application/octet-stream"); base.AddMapping(".setpay", "application/set-payment-initiation"); base.AddMapping(".setreg", "application/set-registration-initiation"); base.AddMapping(".sgml", "text/sgml"); base.AddMapping(".sh", "application/x-sh"); base.AddMapping(".shar", "application/x-shar"); base.AddMapping(".sit", "application/x-stuffit"); base.AddMapping(".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12"); base.AddMapping(".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide"); base.AddMapping(".smd", "audio/x-smd"); base.AddMapping(".smi", "application/octet-stream"); base.AddMapping(".smx", "audio/x-smd"); base.AddMapping(".smz", "audio/x-smd"); base.AddMapping(".snd", "audio/basic"); base.AddMapping(".snp", "application/octet-stream"); base.AddMapping(".spc", "application/x-pkcs7-certificates"); base.AddMapping(".spl", "application/futuresplash"); base.AddMapping(".src", "application/x-wais-source"); base.AddMapping(".ssm", "application/streamingmedia"); base.AddMapping(".sst", "application/vnd.ms-pki.certstore"); base.AddMapping(".stl", "application/vnd.ms-pki.stl"); base.AddMapping(".sv4cpio", "application/x-sv4cpio"); base.AddMapping(".sv4crc", "application/x-sv4crc"); base.AddMapping(".swf", "application/x-shockwave-flash"); base.AddMapping(".t", "application/x-troff"); base.AddMapping(".tar", "application/x-tar"); base.AddMapping(".tcl", "application/x-tcl"); base.AddMapping(".tex", "application/x-tex"); base.AddMapping(".texi", "application/x-texinfo"); base.AddMapping(".texinfo", "application/x-texinfo"); base.AddMapping(".tgz", "application/x-compressed"); base.AddMapping(".thmx", "application/vnd.ms-officetheme"); base.AddMapping(".thn", "application/octet-stream"); base.AddMapping(".tif", "image/tiff"); base.AddMapping(".tiff", "image/tiff"); base.AddMapping(".toc", "application/octet-stream"); base.AddMapping(".tr", "application/x-troff"); base.AddMapping(".trm", "application/x-msterminal"); base.AddMapping(".tsv", "text/tab-separated-values"); base.AddMapping(".ttf", "application/octet-stream"); base.AddMapping(".txt", "text/plain"); base.AddMapping(".u32", "application/octet-stream"); base.AddMapping(".uls", "text/iuls"); base.AddMapping(".ustar", "application/x-ustar"); base.AddMapping(".vbs", "text/vbscript"); base.AddMapping(".vcf", "text/x-vcard"); base.AddMapping(".vcs", "text/plain"); base.AddMapping(".vdx", "application/vnd.ms-visio.viewer"); base.AddMapping(".vml", "text/xml"); base.AddMapping(".vsd", "application/vnd.visio"); base.AddMapping(".vss", "application/vnd.visio"); base.AddMapping(".vst", "application/vnd.visio"); base.AddMapping(".vsto", "application/x-ms-vsto"); base.AddMapping(".vsw", "application/vnd.visio"); base.AddMapping(".vsx", "application/vnd.visio"); base.AddMapping(".vtx", "application/vnd.visio"); base.AddMapping(".wav", "audio/wav"); base.AddMapping(".wax", "audio/x-ms-wax"); base.AddMapping(".wbmp", "image/vnd.wap.wbmp"); base.AddMapping(".wcm", "application/vnd.ms-works"); base.AddMapping(".wdb", "application/vnd.ms-works"); base.AddMapping(".wks", "application/vnd.ms-works"); base.AddMapping(".wm", "video/x-ms-wm"); base.AddMapping(".wma", "audio/x-ms-wma"); base.AddMapping(".wmd", "application/x-ms-wmd"); base.AddMapping(".wmf", "application/x-msmetafile"); base.AddMapping(".wml", "text/vnd.wap.wml"); base.AddMapping(".wmlc", "application/vnd.wap.wmlc"); base.AddMapping(".wmls", "text/vnd.wap.wmlscript"); base.AddMapping(".wmlsc", "application/vnd.wap.wmlscriptc"); base.AddMapping(".wmp", "video/x-ms-wmp"); base.AddMapping(".wmv", "video/x-ms-wmv"); base.AddMapping(".wmx", "video/x-ms-wmx"); base.AddMapping(".wmz", "application/x-ms-wmz"); base.AddMapping(".wps", "application/vnd.ms-works"); base.AddMapping(".wri", "application/x-mswrite"); base.AddMapping(".wrl", "x-world/x-vrml"); base.AddMapping(".wrz", "x-world/x-vrml"); base.AddMapping(".wsdl", "text/xml"); base.AddMapping(".wvx", "video/x-ms-wvx"); base.AddMapping(".x", "application/directx"); base.AddMapping(".xaf", "x-world/x-vrml"); base.AddMapping(".xaml", "application/xaml+xml"); base.AddMapping(".xap", "application/x-silverlight-app"); base.AddMapping(".xbap", "application/x-ms-xbap"); base.AddMapping(".xbm", "image/x-xbitmap"); base.AddMapping(".xdr", "text/plain"); base.AddMapping(".xla", "application/vnd.ms-excel"); base.AddMapping(".xlam", "application/vnd.ms-excel.addin.macroEnabled.12"); base.AddMapping(".xlc", "application/vnd.ms-excel"); base.AddMapping(".xlm", "application/vnd.ms-excel"); base.AddMapping(".xls", "application/vnd.ms-excel"); base.AddMapping(".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"); base.AddMapping(".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"); base.AddMapping(".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); base.AddMapping(".xlt", "application/vnd.ms-excel"); base.AddMapping(".xltm", "application/vnd.ms-excel.template.macroEnabled.12"); base.AddMapping(".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"); base.AddMapping(".xlw", "application/vnd.ms-excel"); base.AddMapping(".xml", "text/xml"); base.AddMapping(".xof", "x-world/x-vrml"); base.AddMapping(".xpm", "image/x-xpixmap"); base.AddMapping(".xps", "application/vnd.ms-xpsdocument"); base.AddMapping(".xsd", "text/xml"); base.AddMapping(".xsf", "text/xml"); base.AddMapping(".xsl", "text/xml"); base.AddMapping(".xslt", "text/xml"); base.AddMapping(".xsn", "application/octet-stream"); base.AddMapping(".xtp", "application/octet-stream"); base.AddMapping(".xwd", "image/x-xwindowdump"); base.AddMapping(".z", "application/x-compress"); base.AddMapping(".zip", "application/x-zip-compressed"); } } private static MimeMappingDictionaryBase _mappingDictionary = new MimeMappingDictionaryClassic(); public static string GetMimeMapping(string fileName) { if (fileName == null) { throw new ArgumentNullException("fileName"); } return _mappingDictionary.GetMimeMapping(fileName); } }

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FileInfo fileInfo = new FileInfo(filepath); var ext = fileInfo.Extension; new FileExtensionContentTypeProvider().Mappings.TryGetValue(ext,out var contenttype);

用下面这个方法吧；；

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