How to Determine File Extension MIME Types in ASP.NET and Other Frameworks?

Get the MIME type corresponding to the file extension

Problem Description

How to get the MIME type associated with a file extension?

Solution

ASP.NET and other frameworks

In ASP.NET Core, you have the following options:

• new FileExtensionContentTypeProvider().TryGetContentType(fileName, out contentType); (VNext only)
• MimeTypes NuGet Package
• MimeMappings files from the .NET Framework reference source

.NET Framework 4.5 and above

Use System.Web.MimeMapping.GetMimeMapping Method:

string mimeType = MimeMapping.GetMimeMapping(fileName);

Custom mapping added (reflection)

To add a custom mapping (using reflection), call the following code (Note : private fields are used):

MimeMapping._mappingDictionary.AddMapping(string fileExtension, string mimeType)

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