.NET中的文件扩展名和MIMEtypes

我想从给定的扩展名（最好不访问物理文件）获得MIME内容types。 我已经看到一些关于这个问题的问题，并且描述执行这个的方法可以在下面继续：

1. 使用registry信息 。
2. 使用urlmon.dll的FindMimeFromData 。
3. 使用IIS信息 。
4. 滚动您自己的MIME映射function。 以此表为例。

我已经使用了一段时间了，但是我意识到registry提供的信息是不一致的，取决于机器上安装的软件。 一些扩展，比如.zip，不能​​用来指定一个Content-Type。

解决scheme2号迫使我在磁盘上的文件，以读取第一个字节，这是慢的，但可能会得到很好的结果。

第三种方法是基于目录服务和所有的东西，这是我不喜欢太多，因为我必须添加COM引用，我不知道它是IIS6和IIS7之间的一致性。 另外，我不知道这个方法的性能。

最后，我不想使用自己的表，但最终如果我想要一个体面的性能和平台之间的结果（甚至是单声道）的一致性最终似乎是最好的select。

你认为有比使用我自己的表更好的select，或者其他描述的方法更好吗？ 你有什么经验？

Answer 1

这取决于你所需要的MIMEtypes。 通常，对于服务（Web应用程序，Web服务等），build议不要使用依赖于操作系统设置的MIME列表，或者只能在不能使用MIME信息的情况下作为后备（fallback）。

我认为这也是MSselect在System.Web.MimeMapping类中使用常量MIMEtypes的原因（遗憾的是，无论出于何种原因，它都是内部的）。

编辑：

包装（<= .NET 3.5）

 public static class MimeExtensionHelper { static object locker = new object(); static object mimeMapping; static MethodInfo getMimeMappingMethodInfo; static MimeExtensionHelper() { Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping"); if (mimeMappingType == null) throw new SystemException("Couldnt find MimeMapping type"); ConstructorInfo constructorInfo = mimeMappingType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null); if (constructorInfo == null) throw new SystemException("Couldnt find default constructor for MimeMapping"); mimeMapping = constructorInfo.Invoke(null); if (mimeMapping == null) throw new SystemException("Couldnt find MimeMapping"); getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic); if (getMimeMappingMethodInfo == null) throw new SystemException("Couldnt find GetMimeMapping method"); if (getMimeMappingMethodInfo.ReturnType != typeof(string)) throw new SystemException("GetMimeMapping method has invalid return type"); if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string)) throw new SystemException("GetMimeMapping method has invalid parameters"); } public static string GetMimeType(string filename) { lock (locker) return (string)getMimeMappingMethodInfo.Invoke(mimeMapping, new object[] { filename }); } } 

包装（.NET 4.0）

 public static class MimeExtensionHelper { static object locker = new object(); static object mimeMapping; static MethodInfo getMimeMappingMethodInfo; static MimeExtensionHelper() { Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping"); if (mimeMappingType == null) throw new SystemException("Couldnt find MimeMapping type"); getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public); if (getMimeMappingMethodInfo == null) throw new SystemException("Couldnt find GetMimeMapping method"); if (getMimeMappingMethodInfo.ReturnType != typeof(string)) throw new SystemException("GetMimeMapping method has invalid return type"); if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string)) throw new SystemException("GetMimeMapping method has invalid parameters"); } public static string GetMimeType(string filename) { lock (locker) return (string)getMimeMappingMethodInfo.Invoke(mimeMapping, new object[] { filename }); } } 

.NET 4.5+

不需要包装，直接调用公共方法System.Web.MimeMapping.GetMimeMapping 。

Answer 2

我已经将所有这些方法结合在我的实用程序库中，除了可能不是。 顺便说一句，no.2（urlmon.dll）不需要静态文件，它只需要一些字节，无论他们来自哪里。 这是我目前的课程

 namespace Components { using System; using System.Collections.Generic; using System.IO; using System.Runtime.InteropServices; using System.Text; using System.Xml.Serialization; using Microsoft.Win32; public sealed class MimeExtensionHelper { private MimeExtensionHelper() { } /// <summary>Finds extension associated with specified mime type</summary> /// <param name="mimeType">mime type you search extension for, eg: "application/octet-stream"</param> /// <returns>most used extension, associated with provided type, eg: ".bin"</returns> public static string FindExtension(string mimeType) { return ExtensionTypes.GetExtension(mimeType); } /// <summary>Finds mime type using provided extension and/or file's binary content.</summary> /// <param name="file">Full file path</param> /// <param name="verifyFromContent">Should the file's content be examined to verify founded value.</param> /// <returns>mime type of file, eg: "application/octet-stream"</returns> public static string FindMime(string file,bool verifyFromContent) { string extension = Path.GetExtension(file); string mimeType = string.Empty; try { if (!String.IsNullOrEmpty(extension)) mimeType = ExtensionTypes.GetMimeType(extension); if (verifyFromContent || (String.IsNullOrEmpty(mimeType) && File.Exists(file))) mimeType = FindMimeByContent(file,mimeType); } catch { } return (mimeType ?? string.Empty).Trim();//"application/octet-stream" } /// <summary>Finds mime type for file using it's binary data.</summary> /// <param name="file">Full path to file.</param> /// <param name="proposedType">Optional. Expected file's type.</param> /// <returns>mime type, eg: "application/octet-stream"</returns> public static string FindMimeByContent(string file ,string proposedType) { FileInfo fi = new FileInfo(file); if (!fi.Exists) throw new FileNotFoundException(file); byte[] buf = new byte[Math.Min(4096L,fi.Length)]; using (FileStream fs = File.OpenRead(file)) fs.Read(buf,0,buf.Length); return FindMimeByData(buf,proposedType); } /// <summary>Finds mime type for binary data.</summary> /// <param name="dataBytes">Binary data to examine.</param> /// <param name="mimeProposed">Optional. Expected mime type.</param> /// <returns>mime type, eg: "application/octet-stream"</returns> public static string FindMimeByData(byte[] dataBytes,string mimeProposed) { if (dataBytes == null || dataBytes.Length == 0) throw new ArgumentNullException("dataBytes"); string mimeRet = String.Empty; IntPtr outPtr = IntPtr.Zero; if (!String.IsNullOrEmpty(mimeProposed)) mimeRet = mimeProposed; int result = FindMimeFromData(IntPtr.Zero ,null ,dataBytes ,dataBytes.Length ,String.IsNullOrEmpty(mimeProposed) ? null : mimeProposed ,0 ,out outPtr ,0); if (result != 0) throw Marshal.GetExceptionForHR(result); if (outPtr != null && outPtr != IntPtr.Zero) { mimeRet = Marshal.PtrToStringUni(outPtr); Marshal.FreeCoTaskMem(outPtr); } return mimeRet; } [DllImport("urlmon.dll" ,CharSet = CharSet.Unicode ,ExactSpelling = true ,SetLastError = true)] static extern Int32 FindMimeFromData(IntPtr pBC ,[MarshalAs(UnmanagedType.LPWStr)] String pwzUrl ,[MarshalAs(UnmanagedType.LPArray,ArraySubType = UnmanagedType.I1,SizeParamIndex = 3)] Byte[] pBuffer ,Int32 cbSize ,[MarshalAs(UnmanagedType.LPWStr)] String pwzMimeProposed ,Int32 dwMimeFlags ,out IntPtr ppwzMimeOut ,Int32 dwReserved); private static MimeTypeCollection _extensionTypes = null; private static MimeTypeCollection ExtensionTypes { get { if (_extensionTypes == null) _extensionTypes = new MimeTypeCollection(); return _extensionTypes; } } [Serializable] [XmlRoot(ElementName = "mimeTypes")] private class MimeTypeCollection : List<MimeTypeCollection.mimeTypeInfo> { private SortedList<string,string> _extensions; private SortedList<string,List<string>> _mimes; private void Init() { if (_extensions == null || _mimes == null || _extensions.Count == 0 || _mimes.Count == 0) { _extensions = new SortedList<string,string>(StringComparer.OrdinalIgnoreCase); _mimes = new SortedList<string,List<string>>(StringComparer.OrdinalIgnoreCase); foreach (var mime in this) { _mimes.Add(mime.MimeType,new List<string>(mime.Extensions)); foreach (string ext in mime.Extensions) if (!_extensions.ContainsKey(ext)) _extensions.Add(ext,mime.MimeType); } } } public String GetExtension(string type) { Init(); return _mimes.ContainsKey(type) ? _mimes[type][0] : string.Empty; } public String GetMimeType(string extension) { Init(); return _extensions.ContainsKey(extension) ? _extensions[extension] : string.Empty; } public MimeTypeCollection() { this.Add(new mimeTypeInfo("application/applixware",new List<string>(new[] { ".aw" }))); this.Add(new mimeTypeInfo("application/atom+xml",new List<string>(new[] { ".atom" }))); // ... Whole list from apache's site this.Add(new mimeTypeInfo("x-x509-ca-cert",new List<string>(new[] { ".cer" }))); try { using (RegistryKey classesRoot = Registry.ClassesRoot) using (RegistryKey typeKey = classesRoot.OpenSubKey(@"MIME\Database\Content Type")) { string[] subKeyNames = typeKey.GetSubKeyNames(); string extension = string.Empty; foreach (string keyname in subKeyNames) { string trimmed = (keyname ?? string.Empty).Trim(); if (string.IsNullOrEmpty(trimmed)) continue; if (!String.IsNullOrEmpty(GetExtension(trimmed))) continue; string subKey = "MIME\\Database\\Content Type\\" + trimmed; using (RegistryKey curKey = classesRoot.OpenSubKey(subKey)) { extension = (curKey.GetValue("Extension") as string ?? string.Empty).Trim(); if (extension.Length > 0) this.Add(new mimeTypeInfo(trimmed ,new List<string>(new[] { extension }))); } } } } catch (Exception ex) { string s = ex.ToString(); } } [Serializable] public class mimeTypeInfo { [XmlAttribute(AttributeName = "mimeType")] public String MimeType { get; set; } [XmlElement("extension")] public List<String> Extensions { get; set; } public mimeTypeInfo(string mimeType,List<string> extensions) { MimeType = mimeType; Extensions = extensions; } public mimeTypeInfo() { } } } } 

}

Answer 3

System.Web.MimeMapping有三个版本 – 两个版本4.0（其中之一是内部的），然后是一个版本2.0也是内部的。 正如所指出的那样，.NET 4.5框架的System.Web 4.0版本中有一个公共版本。

对于RoadkillWiki我已经基本上反向工程，以节省每次反映的麻烦，Wiki的文件处理程序默认尝试使用IIS / applicationhost.config，然后通过MimeMapping类：

 private string GetMimeType(string fileExtension, ServerManager serverManager) { try { string mimeType = "text/plain"; Microsoft.Web.Administration.Configuration config = serverManager.GetApplicationHostConfiguration(); ConfigurationSection staticContentSection = config.GetSection("system.webServer/staticContent"); ConfigurationElementCollection mimemaps = staticContentSection.GetCollection(); ConfigurationElement element = mimemaps.FirstOrDefault(m => m.Attributes["fileExtension"].Value.ToString() == fileExtension); if (element != null) mimeType = element.Attributes["mimeType"].Value.ToString(); return mimeType; } catch (UnauthorizedAccessException) { // Shared hosting won't have access to the applicationhost.config file return MimeMapping.GetMimeMapping("." +fileExtension); } } 

和MimeMapping：

 public class MimeMapping { private static Dictionary<string, string> ExtensionMap = new Dictionary<string, string>(); static MimeMapping() { ExtensionMap.Add(".323", "text/h323"); ExtensionMap.Add(".asx", "video/x-ms-asf"); ExtensionMap.Add(".acx", "application/internet-property-stream"); ExtensionMap.Add(".ai", "application/postscript"); ExtensionMap.Add(".aif", "audio/x-aiff"); ExtensionMap.Add(".aiff", "audio/aiff"); ExtensionMap.Add(".axs", "application/olescript"); ExtensionMap.Add(".aifc", "audio/aiff"); ExtensionMap.Add(".asr", "video/x-ms-asf"); ExtensionMap.Add(".avi", "video/x-msvideo"); ExtensionMap.Add(".asf", "video/x-ms-asf"); ExtensionMap.Add(".au", "audio/basic"); ExtensionMap.Add(".application", "application/x-ms-application"); ExtensionMap.Add(".bin", "application/octet-stream"); ExtensionMap.Add(".bas", "text/plain"); ExtensionMap.Add(".bcpio", "application/x-bcpio"); ExtensionMap.Add(".bmp", "image/bmp"); ExtensionMap.Add(".cdf", "application/x-cdf"); ExtensionMap.Add(".cat", "application/vndms-pkiseccat"); ExtensionMap.Add(".crt", "application/x-x509-ca-cert"); ExtensionMap.Add(".c", "text/plain"); ExtensionMap.Add(".css", "text/css"); ExtensionMap.Add(".cer", "application/x-x509-ca-cert"); ExtensionMap.Add(".crl", "application/pkix-crl"); ExtensionMap.Add(".cmx", "image/x-cmx"); ExtensionMap.Add(".csh", "application/x-csh"); ExtensionMap.Add(".cod", "image/cis-cod"); ExtensionMap.Add(".cpio", "application/x-cpio"); ExtensionMap.Add(".clp", "application/x-msclip"); ExtensionMap.Add(".crd", "application/x-mscardfile"); ExtensionMap.Add(".deploy", "application/octet-stream"); ExtensionMap.Add(".dll", "application/x-msdownload"); ExtensionMap.Add(".dot", "application/msword"); ExtensionMap.Add(".doc", "application/msword"); ExtensionMap.Add(".dvi", "application/x-dvi"); ExtensionMap.Add(".dir", "application/x-director"); ExtensionMap.Add(".dxr", "application/x-director"); ExtensionMap.Add(".der", "application/x-x509-ca-cert"); ExtensionMap.Add(".dib", "image/bmp"); ExtensionMap.Add(".dcr", "application/x-director"); ExtensionMap.Add(".disco", "text/xml"); ExtensionMap.Add(".exe", "application/octet-stream"); ExtensionMap.Add(".etx", "text/x-setext"); ExtensionMap.Add(".evy", "application/envoy"); ExtensionMap.Add(".eml", "message/rfc822"); ExtensionMap.Add(".eps", "application/postscript"); ExtensionMap.Add(".flr", "x-world/x-vrml"); ExtensionMap.Add(".fif", "application/fractals"); ExtensionMap.Add(".gtar", "application/x-gtar"); ExtensionMap.Add(".gif", "image/gif"); ExtensionMap.Add(".gz", "application/x-gzip"); ExtensionMap.Add(".hta", "application/hta"); ExtensionMap.Add(".htc", "text/x-component"); ExtensionMap.Add(".htt", "text/webviewhtml"); ExtensionMap.Add(".h", "text/plain"); ExtensionMap.Add(".hdf", "application/x-hdf"); ExtensionMap.Add(".hlp", "application/winhlp"); ExtensionMap.Add(".html", "text/html"); ExtensionMap.Add(".htm", "text/html"); ExtensionMap.Add(".hqx", "application/mac-binhex40"); ExtensionMap.Add(".isp", "application/x-internet-signup"); ExtensionMap.Add(".iii", "application/x-iphone"); ExtensionMap.Add(".ief", "image/ief"); ExtensionMap.Add(".ivf", "video/x-ivf"); ExtensionMap.Add(".ins", "application/x-internet-signup"); ExtensionMap.Add(".ico", "image/x-icon"); ExtensionMap.Add(".jpg", "image/jpeg"); ExtensionMap.Add(".jfif", "image/pjpeg"); ExtensionMap.Add(".jpe", "image/jpeg"); ExtensionMap.Add(".jpeg", "image/jpeg"); ExtensionMap.Add(".js", "application/x-javascript"); ExtensionMap.Add(".lsx", "video/x-la-asf"); ExtensionMap.Add(".latex", "application/x-latex"); ExtensionMap.Add(".lsf", "video/x-la-asf"); ExtensionMap.Add(".manifest", "application/x-ms-manifest"); ExtensionMap.Add(".mhtml", "message/rfc822"); ExtensionMap.Add(".mny", "application/x-msmoney"); ExtensionMap.Add(".mht", "message/rfc822"); ExtensionMap.Add(".mid", "audio/mid"); ExtensionMap.Add(".mpv2", "video/mpeg"); ExtensionMap.Add(".man", "application/x-troff-man"); ExtensionMap.Add(".mvb", "application/x-msmediaview"); ExtensionMap.Add(".mpeg", "video/mpeg"); ExtensionMap.Add(".m3u", "audio/x-mpegurl"); ExtensionMap.Add(".mdb", "application/x-msaccess"); ExtensionMap.Add(".mpp", "application/vnd.ms-project"); ExtensionMap.Add(".m1v", "video/mpeg"); ExtensionMap.Add(".mpa", "video/mpeg"); ExtensionMap.Add(".me", "application/x-troff-me"); ExtensionMap.Add(".m13", "application/x-msmediaview"); ExtensionMap.Add(".movie", "video/x-sgi-movie"); ExtensionMap.Add(".m14", "application/x-msmediaview"); ExtensionMap.Add(".mpe", "video/mpeg"); ExtensionMap.Add(".mp2", "video/mpeg"); ExtensionMap.Add(".mov", "video/quicktime"); ExtensionMap.Add(".mp3", "audio/mpeg"); ExtensionMap.Add(".mpg", "video/mpeg"); ExtensionMap.Add(".ms", "application/x-troff-ms"); ExtensionMap.Add(".nc", "application/x-netcdf"); ExtensionMap.Add(".nws", "message/rfc822"); ExtensionMap.Add(".oda", "application/oda"); ExtensionMap.Add(".ods", "application/oleobject"); ExtensionMap.Add(".pmc", "application/x-perfmon"); ExtensionMap.Add(".p7r", "application/x-pkcs7-certreqresp"); ExtensionMap.Add(".p7b", "application/x-pkcs7-certificates"); ExtensionMap.Add(".p7s", "application/pkcs7-signature"); ExtensionMap.Add(".pmw", "application/x-perfmon"); ExtensionMap.Add(".ps", "application/postscript"); ExtensionMap.Add(".p7c", "application/pkcs7-mime"); ExtensionMap.Add(".pbm", "image/x-portable-bitmap"); ExtensionMap.Add(".ppm", "image/x-portable-pixmap"); ExtensionMap.Add(".pub", "application/x-mspublisher"); ExtensionMap.Add(".pnm", "image/x-portable-anymap"); ExtensionMap.Add(".pml", "application/x-perfmon"); ExtensionMap.Add(".p10", "application/pkcs10"); ExtensionMap.Add(".pfx", "application/x-pkcs12"); ExtensionMap.Add(".p12", "application/x-pkcs12"); ExtensionMap.Add(".pdf", "application/pdf"); ExtensionMap.Add(".pps", "application/vnd.ms-powerpoint"); ExtensionMap.Add(".p7m", "application/pkcs7-mime"); ExtensionMap.Add(".pko", "application/vndms-pkipko"); ExtensionMap.Add(".ppt", "application/vnd.ms-powerpoint"); ExtensionMap.Add(".pmr", "application/x-perfmon"); ExtensionMap.Add(".pma", "application/x-perfmon"); ExtensionMap.Add(".pot", "application/vnd.ms-powerpoint"); ExtensionMap.Add(".prf", "application/pics-rules"); ExtensionMap.Add(".pgm", "image/x-portable-graymap"); ExtensionMap.Add(".qt", "video/quicktime"); ExtensionMap.Add(".ra", "audio/x-pn-realaudio"); ExtensionMap.Add(".rgb", "image/x-rgb"); ExtensionMap.Add(".ram", "audio/x-pn-realaudio"); ExtensionMap.Add(".rmi", "audio/mid"); ExtensionMap.Add(".ras", "image/x-cmu-raster"); ExtensionMap.Add(".roff", "application/x-troff"); ExtensionMap.Add(".rtf", "application/rtf"); ExtensionMap.Add(".rtx", "text/richtext"); ExtensionMap.Add(".sv4crc", "application/x-sv4crc"); ExtensionMap.Add(".spc", "application/x-pkcs7-certificates"); ExtensionMap.Add(".setreg", "application/set-registration-initiation"); ExtensionMap.Add(".snd", "audio/basic"); ExtensionMap.Add(".stl", "application/vndms-pkistl"); ExtensionMap.Add(".setpay", "application/set-payment-initiation"); ExtensionMap.Add(".stm", "text/html"); ExtensionMap.Add(".shar", "application/x-shar"); ExtensionMap.Add(".sh", "application/x-sh"); ExtensionMap.Add(".sit", "application/x-stuffit"); ExtensionMap.Add(".spl", "application/futuresplash"); ExtensionMap.Add(".sct", "text/scriptlet"); ExtensionMap.Add(".scd", "application/x-msschedule"); ExtensionMap.Add(".sst", "application/vndms-pkicertstore"); ExtensionMap.Add(".src", "application/x-wais-source"); ExtensionMap.Add(".sv4cpio", "application/x-sv4cpio"); ExtensionMap.Add(".tex", "application/x-tex"); ExtensionMap.Add(".tgz", "application/x-compressed"); ExtensionMap.Add(".t", "application/x-troff"); ExtensionMap.Add(".tar", "application/x-tar"); ExtensionMap.Add(".tr", "application/x-troff"); ExtensionMap.Add(".tif", "image/tiff"); ExtensionMap.Add(".txt", "text/plain"); ExtensionMap.Add(".texinfo", "application/x-texinfo"); ExtensionMap.Add(".trm", "application/x-msterminal"); ExtensionMap.Add(".tiff", "image/tiff"); ExtensionMap.Add(".tcl", "application/x-tcl"); ExtensionMap.Add(".texi", "application/x-texinfo"); ExtensionMap.Add(".tsv", "text/tab-separated-values"); ExtensionMap.Add(".ustar", "application/x-ustar"); ExtensionMap.Add(".uls", "text/iuls"); ExtensionMap.Add(".vcf", "text/x-vcard"); ExtensionMap.Add(".wps", "application/vnd.ms-works"); ExtensionMap.Add(".wav", "audio/wav"); ExtensionMap.Add(".wrz", "x-world/x-vrml"); ExtensionMap.Add(".wri", "application/x-mswrite"); ExtensionMap.Add(".wks", "application/vnd.ms-works"); ExtensionMap.Add(".wmf", "application/x-msmetafile"); ExtensionMap.Add(".wcm", "application/vnd.ms-works"); ExtensionMap.Add(".wrl", "x-world/x-vrml"); ExtensionMap.Add(".wdb", "application/vnd.ms-works"); ExtensionMap.Add(".wsdl", "text/xml"); ExtensionMap.Add(".xml", "text/xml"); ExtensionMap.Add(".xlm", "application/vnd.ms-excel"); ExtensionMap.Add(".xaf", "x-world/x-vrml"); ExtensionMap.Add(".xla", "application/vnd.ms-excel"); ExtensionMap.Add(".xls", "application/vnd.ms-excel"); ExtensionMap.Add(".xof", "x-world/x-vrml"); ExtensionMap.Add(".xlt", "application/vnd.ms-excel"); ExtensionMap.Add(".xlc", "application/vnd.ms-excel"); ExtensionMap.Add(".xsl", "text/xml"); ExtensionMap.Add(".xbm", "image/x-xbitmap"); ExtensionMap.Add(".xlw", "application/vnd.ms-excel"); ExtensionMap.Add(".xpm", "image/x-xpixmap"); ExtensionMap.Add(".xwd", "image/x-xwindowdump"); ExtensionMap.Add(".xsd", "text/xml"); ExtensionMap.Add(".z", "application/x-compress"); ExtensionMap.Add(".zip", "application/x-zip-compressed"); ExtensionMap.Add(".*", "application/octet-stream"); } public static string GetMimeMapping(string fileExtension) { if (ExtensionMap.ContainsKey(fileExtension)) return ExtensionMap[fileExtension]; else return ExtensionMap[".*"]; } } 

Answer 4

我已经编写了一个程序来获取并转换Apache mime.types文件到一个C＃ Dictionary<string, string>文件扩展名。 它在这里：

https://github.com/cymen/ApacheMimeTypesToDotNet

实际的输出是这个文件：

https://github.com/cymen/ApacheMimeTypesToDotNet/blob/master/ApacheMimeTypes.cs

希望别人也觉得它有用！

Answer 5

Nisus – 你愿意为你的公用程序发布完整的源代码吗？ 那真的会有所帮助 谢谢！

没关系….

我编辑了Apache定义文件，只包含定义扩展的条目，然后扩展了代码，以便在运行时从文本文件加载types/扩展。 也许并不优雅，但肯定会为mimetypes创build/维护630行源代码。

[在MimeTypeCollection而不是这个东西的构造函数：this.Add（new mimeTypeInfo（“application / applixware”，new List（new [] {“.aw”}）））;]

  // import mime/extension definition list to facilitate maintenance string dir = AppDomain.CurrentDomain.BaseDirectory; using (TextReader streamReader = new StreamReader(Path.Combine(dir, "MimeDefinitions.txt"))) { string input; while ((input = streamReader.ReadLine()) != null) { if (input.Substring(0, 1) != "#") { // text line format ::= [contenttype]<tab>[space delimited list of extensions, without dot] string contentType = input.Group("0\t1"); string extensionList = input.Group("1\t1"); string[] extensions = extensionList.Split(" ".ToCharArray()); List<string> extensionSet = new List<string>(); foreach (string term in extensions) { extensionSet.Add("."+term); } this.Add(new mimeTypeInfo(contentType, extensionSet)); } } } 

我还发现Init（）方法会被调用，_extensions和_mime成员不会被完全初始化，所以我把它改为：

 if (_extensions == null || _mimes == null || _mimes.Count != this.Count) 

无论如何，我现在如何一个类，可以处理外部defs和本地registry我需要。

谢谢！

Answer 6

我还发现Init（）方法会被调用，并且_extensions和_mime成员将不会被完全初始化，所以我将其改为读取，最好的方法是从MimeTypeCollection中移除构造方法中的调用GetExtension：

  public MimeTypeCollection() { this.Add(new mimeTypeInfo("application/applixware", new List<string>(new[] { ".aw" }))); this.Add(new mimeTypeInfo("application/atom+xml", new List<string>(new[] { ".atom" }))); // ... Whole list from apache's site this.Add(new mimeTypeInfo("x-x509-ca-cert", new List<string>(new[] { ".cer" }))); try { using (RegistryKey classesRoot = Registry.ClassesRoot) using (RegistryKey typeKey = classesRoot.OpenSubKey(@"MIME\Database\Content Type")) { string[] subKeyNames = typeKey.GetSubKeyNames(); string extension = string.Empty; foreach (string keyname in subKeyNames) { string trimmed = (keyname ?? string.Empty).Trim(); if (string.IsNullOrEmpty(trimmed)) continue; if (this.Exists(mime => mime.MimeType == trimmed)) continue; //if (!String.IsNullOrEmpty(GetExtension(trimmed))) // continue; string subKey = "MIME\\Database\\Content Type\\" + trimmed; using (RegistryKey curKey = classesRoot.OpenSubKey(subKey)) { extension = (curKey.GetValue("Extension") as string ?? string.Empty).Trim(); if (extension.Length > 0) this.Add(new mimeTypeInfo(trimmed , new List<string>(new[] { extension }))); } } } } catch (Exception ex) { string s = ex.ToString(); } } 

Answer 7

我没有广泛的mimetypes来处理我的应用程序，所以我使用了像你这样的查找表。

因为你的想法并不是那么糟糕。 只需要一个简单的方法来维护和更新查找。