public static string GetMimeTypeWithExtension(string Extension)
{
if (!string.IsNullOrWhiteSpace(Extension))
{
if (!Extension.StartsWith("."))
{
Extension = "." + Extension;
}
string result = null;
if (ExtensionToMimeType.TryGetValue(Extension, out result))
{
return(result);
}
Microsoft.Win32.RegistryKey regKey = default(Microsoft.Win32.RegistryKey);
object value = null;
regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(Extension, false);
value = regKey != null?regKey.GetValue("Content Type", null) : null;
result = value != null?value.ToString() : string.Empty;
ExtensionToMimeType[Extension] = result;
return(result);
}
return(null);
}
public string ConvertExtensionToMimeType(string extension)
{
if (string.IsNullOrWhiteSpace(extension))
{
return("application/octet-stream");
}
if (!extension.StartsWith("."))
{
extension = "." + extension;
}
string strExtension;
if (ExtensionToMimeType.TryGetValue(extension, out strExtension))
{
return(strExtension);
}
switch (extension)
{
case ".html":
case ".htm":
strExtension = "text/html; charset=UTF-8";
break;
case ".css":
strExtension = "text/css; charset=UTF-8";
break;
case ".js":
strExtension = "application/javascript; charset=UTF-8";
break;
case ".json":
strExtension = "application/json; charset=UTF-8";
break;
case ".map":
case ".txt":
strExtension = "text/plain; charset=UTF-8";
break;
case ".xml":
strExtension = "text/xml; charset=UTF-8";
break;
case ".jpeg":
case ".jpg":
strExtension = "image/jpeg";
break;
case ".png":
strExtension = "image/png";
break;
case ".gif":
strExtension = "image/gif";
break;
case ".ico":
strExtension = "image/x-icon";
break;
default:
using (RegistryKey registryKey = Registry.ClassesRoot.OpenSubKey(extension, false))
{
object obj = registryKey != null?registryKey.GetValue("Content Type", (object)null) : (object)null;
strExtension = obj != null?obj.ToString() : "application/octet-stream";
break;
}
}
ExtensionToMimeType.TryAdd(extension, strExtension);
return(strExtension);
}
