内容类型的扩展

16

不是我所知道的。但您可以使用此代码：

using Microsoft.Win32; 

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

您需要为错误处理添加额外的代码。

注意：扩展名需要以点为前缀，如.txt。

来源

2009-12-15 20:30:30 CesarGon

+2

有没有办法走另一个方向？我有内容类型，我想用合适的扩展名缓存内容。 – Jordan 2011-10-24 14:06:57

+2

@Jordan：我建议你用这个建立一个问题。人们会在那里回答。 – CesarGon 2011-10-25 18:17:38

+0

@cesargon是否可以让浏览器下载任何通过查询字符串传递其名称和扩展名的文件。请看我的问题，如果你能回答这个问题。 http://stackoverflow.com/questions/9927339 – 2012-03-30 09:31:11

6

FYKI，检查\ HKEY_CLASSES_ROOT \ MIME \ Database \ Content Type下的注册表。将会有内容类型和文件扩展名列表。如果你可以通过Windows API加载这些信息，那么你可以将你的文件扩展名转换为内容类型映射。

心连心

UPDATE：[来源] [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

来源

2009-12-15 20:53:54 nayakam

+0

我想mrblah希望从扩展中找到内容类型，而不是其他方式。查看MIME数据库的注册表项对于查找给定内容类型的文件扩展名很有用。 – CesarGon 2009-12-15 22:02:47

+0

是的，你是正确的，我想，你的方法将看\ HKEY_CLASSES_ROOT。它具有对内容类型映射的扩展。使用我的方法可以获得价值，但如果多个扩展与一种内容类型相关联，则会出现问题。 – nayakam 2009-12-15 23:17:30

+0

是否有可能让浏览器下载任何通过查询字符串传递其名称和扩展名的文件。请看我的问题，如果你能回答这个问题。 http://stackoverflow.com/questions/9927339 – 2012-03-30 09:30:32

0

这是一个我写的：

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; 


    } 


}

来源

2011-10-14 13:17:35

+1

你有重复的病例陈述 – 2012-03-10 13:44:41

1

如果它是一个上传的文件。您可以将contenttype存储在数据库的某一列中，以供日后在上传文件时使用。 HttpPostedFile类有一个名为ContentType的属性。

来源

2012-10-22 18:52:10 Ike

4

由于.Net Framework 4.5有一个System.Web.MimeMapping类，它有一个完整的MIME类型库和方法来获取请求的MIME类型。

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

或为GetMimeMapping实施：https://referencesource.microsoft.com/#System.Web/MimeMapping.cs

来源

2014-03-06 17:00:18

0

对于或多或少的完整列表，请查看下图（C++，但它是直截了当地将其更改为C＃）。（不知道电子邮件正文是如何生成的 - 通过JavaScript在客户端，或从服务器端的POST - 我的猜测是后者）。这是Google/Chrome如何识别内容类型的表单文件扩展（不知道如何生成电子邮件正文）。我使用以下技巧得到了这个列表：

在互联网上搜索最常用的文件扩展名。很幸运找到了一个html表格，以便我可以将它复制粘贴到Excel中，以获得一个简单的扩展列表。
创建一个小文件测试带有几个字符的内容。
使用（2）中的扩展名列表和一些命令行魔术创建文件test.TXT，test.HTM，test.TIFF等等。 Linux变种是for file in test.TXT test.HTM test.TIFF ... ; do cp test "$file"; done;
将所有这些文件作为附件发送到我的gmail。请注意，出于安全原因，某些文件（如.exe和.zip）被过滤掉。 他们在下面的代码中缺少！
在gmail中，下载了原始文件，在那里可以看到每个附加文件的Content-Type: application/pdf; name="example.pdf"行。在VIM中解释下面的列表。

如果你想添加的一个推广，是不是在下面的列表 - 创建小文件sample.xyz，它发送给自己，看看在内容类型的原始邮件。这就是诀窍。希望能帮助到你！

P.S.我知道这不是最好的列表，但它足以让我学习如何以编程方式发送电子邮件附件，并通过文件扩展名选择Content-Type，就像gmail一样。如果某些扩展类型“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" } 
    };

来源

2017-12-26 20:54:17 OGCJN

内容类型的扩展

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