VB.NET

Check if a MIME Entity is multipart/alternative

Demonstrates the Chilkat Mime.IsMultipartAlternative method, which returns whether the Content-Type is exactly multipart/alternative. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Recognizing multipart/alternative matters because its children are the same content in different formats — you display one (usually the last renderable), not all of them. That is the opposite of multipart/mixed, where every child is shown.

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VB.NET

Dim success As Boolean = False

'  Demonstrates the Mime.IsMultipartAlternative method, which returns whether the Content-Type is multipart/alternative.  It takes no arguments.

Dim mime As New Chilkat.Mime
success = mime.LoadMimeFile("qa_data/multipart_message.eml")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


If (mime.IsMultipartAlternative()) Then
    Debug.WriteLine("This is a multipart/alternative entity.")
Else
    Debug.WriteLine("This is not multipart/alternative.")
End If