MimeStringToFileTypeExtension(String, Boolean) Method

public static string ToFileTypeExtension(
	string? mimeType,
	bool includePeriod = true
)

Public Shared Function ToFileTypeExtension ( 
	mimeType As String,
	Optional includePeriod As Boolean = true
) As String

public:
static String^ ToFileTypeExtension(
	String^ mimeType, 
	bool includePeriod = true
)

static member ToFileTypeExtension : 
        mimeType : string * 
        ?includePeriod : bool 
(* Defaults:
        let _includePeriod = defaultArg includePeriod true
*)
-> string 

Parameters

mimeType  String

A String that represents an Internet Media Type ("MIME type") or null.

includePeriod  Boolean  (Optional)

true specifies, that the period "." (U+002E) is included in the retrieved file type extension, false, that it's not.

Return Value

If no other file type extension can be found, DefaultFileTypeExtension is returned. includePeriod specifies whether the period is included.

This method doesn't perform any validation on mimeType. If a strong validation of the input is needed, the instance methods MimeTypeInfo.GetFileTypeExtension(bool) and MimeType.GetFileTypeExtension(bool) are better suited.

Internally a small memory cache is used to retrieve often used file type extensions faster. You can enlarge the size of this cache with MimeCache.EnlargeCapacity(int) or you can delete it with MimeCache.Clear() if your application does not need it anymore.

Convert a file name into an Internet Media Type and get a file type extension from an Internet Media Type:

using FolkerKinzel.MimeTypes;

namespace Examples;

public static class FileExtensionExample
{
    public static void Example()
    {
        const string path = @"C:\Users\Tester\Desktop\Interesting Text.odt";

        string mimeType = MimeString.FromFileName(path);

        Console.Write($"The MIME type for \"{path}\" is: ");
        Console.WriteLine(mimeType);
        Console.Write("The file type extension for this MIME type is: ");
        Console.WriteLine(MimeString.ToFileTypeExtension(mimeType));
    }
}
/*
Console Output:

The MIME type for "C:\Users\Tester\Desktop\Interesting Text.odt" is: application/vnd.oasis.opendocument.text
The file type extension for this MIME type is: .odt
 */

Reference