, если вы не используете рамки .Net 4.5, то я предлагаю использовать словарь, чтобы найти apropriate тип пантомимы для каждого возможного расширения.
public FileResult Download(string id)
{
int fid = Convert.ToInt32(id);
var files = new DataClasses().GetFiles();
string filename = (from f in files
where f.FileId == fid
select f.FilePath).First();
String filePath = fileName;
fileName = Path.GetFileName(filePath);
String contentType = GetFromFileName(fileName);
return File(filePath, contentType, fileName);
}
public String GetFromFileName(String fileName)
{
return GetFromExtension(Path.GetExtension(fileName).Remove(0, 1));
}
public String GetFromExtension(String ext)
{
if (MIMETypesDictionary.ContainsKey(ext))
{
return MIMETypesDictionary[extension];
}
return "unknown/unknown";
}
private static IDictionary<string, string> MIMETypesDictionary = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) {
{"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"},
{"json", "application/json"},
{"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"}
}
здесь все работает отлично подходит для текстовых документов, но если поместить любой другой тип файла, как Excel или Pdf его показ error Я знаю, эта ошибка вызвана contentType = "application/doc"; Я хочу спросить, как сделать динамический тип контента таким, чтобы можно было легко загрузить любой файл внутри папки.
Непонятно, что вы просите. Просто поставьте там правильный тип mime вместо жестко закодированного 'application/doc'. Вы действительно спрашиваете, как * обнаружить * тип mime из данных? –
У меня есть обновленный вопрос, проверьте его сейчас. –
Ну, вы можете использовать 'Dictionary' для хранения типа mime, связанного с расширением файла, но это все еще может быть неправильным ... –