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Summary: Get the file extension from a file path or file name
Language: VB.NET
Author: Antonio Cosano
Author snippets RSS:
Culture: en-US
Bytes: 1214
Visual Studio 2005 Snippet:

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Code:
Imports Microsoft.Win32
Imports System.IO
' How to call the function
' Get the file extension from a file path or file name
'  -> Dim Extension As String = Path.GetExtension("hello.mp3")
' Get the file type from the extension
' -> Dim FileType = GetFileType(Extension)
Public Shared Function GetFileType(ByVal fileExtension As String) As String
      Dim fileType As String = String.Empty
      'Search all keys under HKEY_CLASSES_ROOT
      For Each subKey As String In Registry.ClassesRoot.GetSubKeyNames()
         If String.IsNullOrEmpty(subKey) Then
            Continue For
         End If
         If subKey.CompareTo(fileExtension) = 0 Then
            'File extension found. Get Default Value
            Dim defaultValue As String = Registry.ClassesRoot.OpenSubKey(subKey).GetValue("").ToString()
            If defaultValue.Length = 0 Then
               'No File Type specified
               Exit For
            End If
            If fileType.Length = 0 Then
               'Get Initial File Type and search for the full File Type Description
               fileType = defaultValue
               fileExtension = fileType
            Else
               'File Type Description found
               If defaultValue.Length > 0 Then
                  fileType = defaultValue
               End If
               Exit For
            End If
         End If
      Next
      Return fileType
   End Function

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