內容類型的擴展

16

不是我所知道的。但您可以使用此代碼：

using Microsoft.Win32; 

RegistryKey key = Registry.ClassesRoot.OpenSubKey(extension); 
string contentType = key.GetValue("Content Type").ToString();

您需要爲錯誤處理添加額外的代碼。

注意：擴展名需要以點爲前綴，如.txt。

來源

2009-12-15 20:30:30 CesarGon

+2

有沒有辦法走另一個方向？我有內容類型，我想用合適的擴展名緩存內容。 – Jordan 2011-10-24 14:06:57

+2

@Jordan：我建議你用這個建立一個問題。人們會在那裏回答。 – CesarGon 2011-10-25 18:17:38

+0

@cesargon是否可以讓瀏覽器下載任何通過查詢字符串傳遞其名稱和擴展名的文件。請看我的問題，如果你能回答這個問題。 http://stackoverflow.com/questions/9927339 – 2012-03-30 09:31:11

6

FYKI，檢查\ HKEY_CLASSES_ROOT \ MIME \ Database \ Content Type下的註冊表。將會有內容類型和文件擴展名列表。如果你可以通過Windows API加載這些信息，那麼你可以將你的文件擴展名轉換爲內容類型映射。

心連心

UPDATE：[來源] [1]

public string GetMIMEType(string filepath) 
    { 
     FileInfo fileInfo = new FileInfo(filepath); 
     string fileExtension = fileInfo.Extension.ToLower(); 

     // direct mapping which is fast and ensures these extensions are found 
     switch (fileExtension) 
     { 
      case "htm": 
      case "html": 
       return "text/html"; 
      case "js": 
       return "text/javascript"; // registry may return "application/x-javascript" 
     } 



      // see if we can find extension info anywhere in the registry 
    //Note : there is not a ContentType key under ALL the file types , check Run --> regedit , then extensions !!! 

     RegistryPermission regPerm = new RegistryPermission(RegistryPermissionAccess.Read, @"\\HKEY_CLASSES_ROOT"); 

     // looks for extension with a content type 
     RegistryKey rkContentTypes = Registry.ClassesRoot.OpenSubKey(fileExtension); 
     if (rkContentTypes != null) 
     { 
      object key = rkContentTypes.GetValue("Content Type"); 
      if (key != null) 
       return key.ToString().ToLower(); 
     } 


     // looks for a content type with extension 
     // Note : This would be problem if multiple extensions associate with one content type. 
     RegistryKey typeKey = Registry.ClassesRoot.OpenSubKey(@"MIME\Database\Content Type"); 

     foreach (string keyname in typeKey.GetSubKeyNames()) 
     { 
      RegistryKey curKey = typeKey.OpenSubKey(keyname); 
      if (curKey != null) 
      { 
       object extension = curKey.GetValue("Extension"); 
       if (extension != null) 
       { 
        if (extension.ToString().ToLower() == fileExtension) 
        { 
         return keyname; 
        } 
       } 
      } 
     } 

     return null; 
    }

[1]：http://www.codeproject.com/KB/dotnet/ContentType.aspx?msg=2903389#xx2903389xxenter code here

來源

2009-12-15 20:53:54 nayakam

+0

我想mrblah希望從擴展中找到內容類型，而不是其他方式。查看MIME數據庫的註冊表項對於查找給定內容類型的文件擴展名很有用。 – CesarGon 2009-12-15 22:02:47

+0

是的，你是正確的，我想，你的方法將看\ HKEY_CLASSES_ROOT。它具有對內容類型映射的擴展。使用我的方法可以獲得價值，但如果多個擴展與一種內容類型相關聯，則會出現問題。 – nayakam 2009-12-15 23:17:30

+0

是否有可能讓瀏覽器下載任何通過查詢字符串傳遞其名稱和擴展名的文件。請看我的問題，如果你能回答這個問題。 http://stackoverflow.com/questions/9927339 – 2012-03-30 09:30:32

0

這是一個我寫的：

public string GetContentTypeByExtension(string strExtension) 
{ 
    switch (strExtension) 
    { 
     case ".fif": 

      return "application/fractals"; 
      break; 

     case ".hta": 

      return "application/hta"; 
      break; 

     case ".hqx": 

      return "application/mac-binhex40"; 
      break; 

     case ".vsi": 

      return "application/ms-vsi"; 
      break; 

     case ".p10": 

      return "application/pkcs10"; 
      break; 

     case ".p7m": 

      return "application/pkcs7-mime"; 
      break; 

     case ".p7s": 

      return "application/pkcs7-signature"; 
      break; 

     case ".cer": 

      return "application/pkix-cert"; 
      break; 

     case ".crl": 

      return "application/pkix-crl"; 
      break; 

     case ".ps": 

      return "application/postscript"; 
      break; 

     case ".setpay": 

      return "application/set-payment-initiation"; 
      break; 

     case ".setreg": 

      return "application/set-registration-initiation"; 
      break; 

     case ".sst": 

      return "application/vnd.ms-pki.certstore"; 
      break; 

     case ".pko": 

      return "application/vnd.ms-pki.pko"; 
      break; 

     case ".cat": 

      return "application/vnd.ms-pki.seccat"; 
      break; 

     case ".stl": 

      return "application/vnd.ms-pki.stl"; 
      break; 

     case ".wpl": 

      return "application/vnd.ms-wpl"; 
      break; 

     case ".xps": 

      return "application/vnd.ms-xpsdocument"; 
      break; 

     case ".z": 

      return "application/x-compress"; 
      break; 

     case ".tgz": 

      return "application/x-compressed"; 
      break; 

     case ".gz": 

      return "application/x-gzip"; 
      break; 

     case ".ins": 

      return "application/x-internet-signup"; 
      break; 

     case ".iii": 

      return "application/x-iphone"; 
      break; 

     case ".jtx": 

      return "application/x-jtx+xps"; 
      break; 

     case ".latex": 

      return "application/x-latex"; 
      break; 

     case ".nix": 

      return "application/x-mix-transfer"; 
      break; 

     case ".asx": 

      return "application/x-mplayer2"; 
      break; 

     case ".application": 

      return "application/x-ms-application"; 
      break; 

     case ".wmd": 

      return "application/x-ms-wmd"; 
      break; 

     case ".wmz": 

      return "application/x-ms-wmz"; 
      break; 

     case ".xbap": 

      return "application/x-ms-xbap"; 
      break; 

     case ".p12": 

      return "application/x-pkcs12"; 
      break; 

     case ".p7b": 

      return "application/x-pkcs7-certificates"; 
      break; 

     case ".p7r": 

      return "application/x-pkcs7-certreqresp"; 
      break; 

     case ".sit": 

      return "application/x-stuffit"; 
      break; 

     case ".tar": 

      return "application/x-tar"; 
      break; 

     case ".man": 

      return "application/x-troff-man"; 
      break; 

     case ".cer": 

      return "application/x-x509-ca-cert"; 
      break; 

     case ".zip": 

      return "application/x-zip-compressed"; 
      break; 

     case ".xaml": 

      return "application/xaml+xml"; 
      break; 

     case ".xml": 

      return "application/xml"; 
      break; 

     case ".aiff": 

      return "audio/aiff"; 
      break; 

     case ".au": 

      return "audio/basic"; 
      break; 

     case ".mid": 

      return "audio/mid"; 
      break; 

     case ".mid": 

      return "audio/midi"; 
      break; 

     case ".mp3": 

      return "audio/mp3"; 
      break; 

     case ".mp3": 

      return "audio/mpeg"; 
      break; 

     case ".m3u": 

      return "audio/mpegurl"; 
      break; 

     case ".mp3": 

      return "audio/mpg"; 
      break; 

     case ".wav": 

      return "audio/wav"; 
      break; 

     case ".aiff": 

      return "audio/x-aiff"; 
      break; 

     case ".mid": 

      return "audio/x-mid"; 
      break; 

     case ".mid": 

      return "audio/x-midi"; 
      break; 

     case ".mp3": 

      return "audio/x-mp3"; 
      break; 

     case ".mp3": 

      return "audio/x-mpeg"; 
      break; 

     case ".m3u": 

      return "audio/x-mpegurl"; 
      break; 

     case ".mp3": 

      return "audio/x-mpg"; 
      break; 

     case ".wax": 

      return "audio/x-ms-wax"; 
      break; 

     case ".wma": 

      return "audio/x-ms-wma"; 
      break; 

     case ".wav": 

      return "audio/x-wav"; 
      break; 

     case ".bmp": 

      return "image/bmp"; 
      break; 

     case ".gif": 

      return "image/gif"; 
      break; 

     case ".jpg": 

      return "image/jpeg"; 
      break; 

     case ".jpg": 

      return "image/pjpeg"; 
      break; 

     case ".png": 

      return "image/png"; 
      break; 

     case ".tiff": 

      return "image/tiff"; 
      break; 

     case ".ico": 

      return "image/x-icon"; 
      break; 

     case ".png": 

      return "image/x-png"; 
      break; 

     case ".mid": 

      return "midi/mid"; 
      break; 

     case ".dwfx": 

      return "model/vnd.dwfx+xps"; 
      break; 

     case ".css": 

      return "text/css"; 
      break; 

     case ".323": 

      return "text/h323"; 
      break; 

     case ".htm": 

      return "text/html"; 
      break; 

     case ".uls": 

      return "text/iuls"; 
      break; 

     case ".txt": 

      return "text/plain"; 
      break; 

     case ".wsc": 

      return "text/scriptlet"; 
      break; 

     case ".htt": 

      return "text/webviewhtml"; 
      break; 

     case ".htc": 

      return "text/x-component"; 
      break; 

     case ".vcf": 

      return "text/x-vcard"; 
      break; 

     case ".xml": 

      return "text/xml"; 
      break; 

     case ".avi": 

      return "video/avi"; 
      break; 

     case ".mpeg": 

      return "video/mpeg"; 
      break; 

     case ".mpeg": 

      return "video/mpg"; 
      break; 

     case ".avi": 

      return "video/msvideo"; 
      break; 

     case ".mpeg": 

      return "video/x-mpeg"; 
      break; 

     case ".mpeg": 

      return "video/x-mpeg2a"; 
      break; 

     case ".asx": 

      return "video/x-ms-asf"; 
      break; 

     case ".asx": 

      return "video/x-ms-asf-plugin"; 
      break; 

     case ".wm": 

      return "video/x-ms-wm"; 
      break; 

     case ".wmv": 

      return "video/x-ms-wmv"; 
      break; 

     case ".wmx": 

      return "video/x-ms-wmx"; 
      break; 

     case ".wvx": 

      return "video/x-ms-wvx"; 
      break; 

     case ".avi": 

      return "video/x-msvideo"; 
      break; 


    } 


}

來源

2011-10-14 13:17:35

+1

你有重複的病例陳述 – 2012-03-10 13:44:41

1

如果它是一個上傳的文件。您可以將contenttype存儲在數據庫的某一列中，以供日後在上傳文件時使用。 HttpPostedFile類有一個名爲ContentType的屬性。

來源

2012-10-22 18:52:10 Ike

4

由於.Net Framework 4.5有一個System.Web.MimeMapping類，它有一個完整的MIME類型庫和方法來獲取請求的MIME類型。

參見：http://msdn.microsoft.com/en-us/library/system.web.mimemapping(v=vs.110).aspx

或爲GetMimeMapping實施：https://referencesource.microsoft.com/#System.Web/MimeMapping.cs

來源

2014-03-06 17:00:18

0

對於或多或少的完整列表，請查看下圖（C++，但它是直截了當地將其更改爲C＃）。（不知道電子郵件正文是如何生成的 - 通過JavaScript在客戶端，或從服務器端的POST - 我的猜測是後者）。這是Google/Chrome如何識別內容類型的表單文件擴展（不知道如何生成電子郵件正文）。我使用以下技巧得到了這個列表：

在互聯網上搜索最常用的文件擴展名。很幸運找到了一個html表格，以便我可以將它複製粘貼到Excel中，以獲得一個簡單的擴展列表。
創建一個小文件測試帶有幾個字符的內容。
使用（2）中的擴展名列表和一些命令行魔術創建文件test.TXT，test.HTM，test.TIFF等等。 Linux變種是for file in test.TXT test.HTM test.TIFF ... ; do cp test "$file"; done;
將所有這些文件作爲附件發送到我的gmail。請注意，出於安全原因，某些文件（如.exe和.zip）被過濾掉。 他們在下面的代碼中缺少！
在gmail中，下載了原始文件，在那裏可以看到每個附加文件的Content-Type: application/pdf; name="example.pdf"行。在VIM中解釋下面的列表。

如果你想添加的一個推廣，是不是在下面的列表 - 創建小文件sample.xyz，它發送給自己，看看在內容類型的原始郵件。這就是訣竅。希望能幫助到你！

P.S.我知道這不是最好的列表，但它足以讓我學習如何以編程方式發送電子郵件附件，並通過文件擴展名選擇Content-Type，就像gmail一樣。如果某些擴展類型「缺失」，不要苛刻。

static const map<string, string> ContentTypes = { 
     { "TXT","text/plain" }, 
     { "HTM","text/html" }, 
     { "TIFF","image/tiff" }, 
     { "TMP","application/octet-stream" }, 
     { "TOAST","application/octet-stream" }, 
     { "TORRENT","application/x-bittorrent" }, 
     { "TTF","application/x-font-ttf" }, 
     { "UUE","application/octet-stream" }, 
     { "VCD","application/x-cdlink" }, 
     { "VCF","text/x-vcard" }, 
     { "VCXPROJ","application/xml" }, 
     { "VOB","application/octet-stream" }, 
     { "WAV","audio/x-wav" }, 
     { "WMA","audio/x-ms-wma" }, 
     { "WMV","video/x-ms-wmv" }, 
     { "WPD","application/wordperfect" }, 
     { "WPS","application/octet-stream" }, 
     { "XCODEPROJ","application/octet-stream" }, 
     { "XHTML","application/xhtml+xml" }, 
     { "XLR","application/octet-stream" }, 
     { "XLS","application/vnd.ms-excel" }, 
     { "XLSX","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" }, 
     { "XML","text/xml" }, 
     { "YUV","application/octet-stream" }, 
     { "ZIPX","application/octet-stream" }, 
     { "3DM","application/octet-stream" }, 
     { "3DS","application/octet-stream" }, 
     { "3G2","video/3gpp2" }, 
     { "3GP","video/3gpp" }, 
     { "ACCDB","application/octet-stream" }, 
     { "AI","application/illustrator" }, 
     { "AIF","audio/x-aiff" }, 
     { "APK","application/vnd.android.package-archive" }, 
     { "APP","application/octet-stream" }, 
     { "ASF","video/x-ms-asf" }, 
     { "ASP","application/octet-stream" }, 
     { "ASPX","application/xml" }, 
     { "AVI","video/x-msvideo" }, 
     { "BAK","application/octet-stream" }, 
     { "BIN","application/octet-stream" }, 
     { "BMP","image/bmp" }, 
     { "C","text/x-csrc" }, 
     { "CAB","application/octet-stream" }, 
     { "CBR","application/octet-stream" }, 
     { "CER","application/x-x509-ca-cert" }, 
     { "CFG","application/octet-stream" }, 
     { "CFM","application/octet-stream" }, 
     { "CGI","application/octet-stream" }, 
     { "CLASS","application/octet-stream" }, 
     { "CPP","text/x-c++src" }, 
     { "CRDOWNLOAD","application/octet-stream" }, 
     { "CRX","application/x-chrome-extension" }, 
     { "CS","text/plain" }, 
     { "CSR","application/octet-stream" }, 
     { "CSS","text/css" }, 
     { "CSV","text/csv" }, 
     { "CUE","application/octet-stream" }, 
     { "CUR","application/octet-stream" }, 
     { "DAT","application/octet-stream" }, 
     { "DB","application/octet-stream" }, 
     { "DBF","application/octet-stream" }, 
     { "DDS","image/vnd.ms-dds" }, 
     { "DEB","application/x-debian-package" }, 
     { "DEM","application/octet-stream" }, 
     { "DESKTHEMEPACK","application/octet-stream" }, 
     { "DLL","application/octet-stream" }, 
     { "DMG","application/octet-stream" }, 
     { "DMP","application/octet-stream" }, 
     { "DOC","application/msword" }, 
     { "DOCX","application/vnd.openxmlformats-officedocument.wordprocessingml.document" }, 
     { "DRV","application/octet-stream" }, 
     { "DTD","application/xml-dtd" }, 
     { "DWG","application/octet-stream" }, 
     { "DXF","application/dxf" }, 
     { "EPS","application/postscript" }, 
     { "FLA","application/octet-stream" }, 
     { "FLV","video/x-flv" }, 
     { "FNT","application/octet-stream+fnt" }, 
     { "FON","application/octet-stream+fon" }, 
     { "GADGET","application/octet-stream" }, 
     { "GAM","application/octet-stream" }, 
     { "GED","application/octet-stream" }, 
     { "GIF","image/gif" }, 
     { "GPX","application/gpx+xml" }, 
     { "GZ","application/x-gzip" }, 
     { "H","text/x-chdr" }, 
     { "HQX","application/mac-binhex40" }, 
     { "HTML","text/html" }, 
     { "ICNS","application/octet-stream" }, 
     { "ICO","image/x-icon" }, 
     { "ICS","text/calendar" }, 
     { "IFF","application/octet-stream" }, 
     { "INDD","application/octet-stream" }, 
     { "INI","application/octet-stream" }, 
     { "ISO","application/octet-stream" }, 
     { "JAVA","application/octet-stream" }, 
     { "JPG","image/jpeg" }, 
     { "JSP","application/octet-stream" }, 
     { "KEY","application/octet-stream" }, 
     { "KEYCHAIN","application/octet-stream" }, 
     { "KML","application/vnd.google-earth.kml+xml" }, 
     { "KMZ","application/vnd.google-earth.kmz" }, 
     { "LOG","application/octet-stream" }, 
     { "LUA","application/octet-stream" }, 
     { "M","application/octet-stream" }, 
     { "M3U","audio/x-mpegurl" }, 
     { "M4A","audio/mp4" }, 
     { "M4V","video/x-m4v" }, 
     { "MAX","application/octet-stream" }, 
     { "MDB","application/octet-stream" }, 
     { "MDF","application/octet-stream" }, 
     { "MID","audio/midi" }, 
     { "MIM","application/octet-stream" }, 
     { "MOV","video/quicktime" }, 
     { "MP3","audio/mpeg" }, 
     { "MP4","video/mp4" }, 
     { "MPA","audio/mpeg" }, 
     { "MPG","video/mpeg" }, 
     { "MSG","application/octet-stream" }, 
     { "NES","application/octet-stream" }, 
     { "OBJ","application/octet-stream" }, 
     { "ODT","application/vnd.oasis.opendocument.text" }, 
     { "OTF","application/vnd.oasis.opendocument.formula-template" }, 
     { "PAGES","application/x-iwork-pages-sffpages" }, 
     { "PART","application/octet-stream" }, 
     { "PCT","application/octet-stream" }, 
     { "PDB","chemical/x-pdb" }, 
     { "PDF","application/pdf" }, 
     { "PHP","application/x-httpd-php" }, 
     { "PKG","application/octet-stream" }, 
     { "PL","application/octet-stream" }, 
     { "PLUGIN","application/octet-stream" }, 
     { "PNG","image/png" }, 
     { "PPS","application/vnd.ms-powerpoint" }, 
     { "PPT","application/vnd.ms-powerpoint" }, 
     { "PPTX","application/vnd.openxmlformats-officedocument.presentationml.presentation" }, 
     { "PRF","application/pics-rules" }, 
     { "PS","application/postscript" }, 
     { "PSD","application/photoshop" }, 
     { "PSPIMAGE","application/octet-stream" }, 
     { "PY","application/octet-stream" }, 
     { "RM","audio/x-pn-realaudio" }, 
     { "ROM","application/octet-stream" }, 
     { "RPM","application/x-rpm" }, 
     { "RSS","application/octet-stream" }, 
     { "RTF","application/rtf" }, 
     { "SAV","application/octet-stream" }, 
     { "SDF","application/octet-stream" }, 
     { "SH","application/x-sh" }, 
     { "SITX","application/octet-stream" }, 
     { "SLN","text/plain" }, 
     { "SQL","application/octet-stream" }, 
     { "SRT","application/octet-stream" }, 
     { "SVG","image/svg+xml" }, 
     { "SWF","application/x-shockwave-flash" }, 
     { "SWIFT","application/octet-stream" }, 
     { "TAX2016","application/octet-stream" }, 
     { "TEX","application/x-tex" } 
    };

來源

2017-12-26 20:54:17 OGCJN

內容類型的擴展

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