pinvoke.net: Edit: shell32.shchangenotify

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Summary: The SHChangeNotify API

!!!!C# Signature:
 [DllImport("shell32.dll")]
 static extern void SHChangeNotify(HChangeNotifyEventID wEventId, 
			       				HChangeNotifyFlags uFlags, 
			       				IntPtr dwItem1, 
			       				IntPtr dwItem2);
!!!!VB Signature:
    <DllImport("shell32.dll")> _
    Shared Sub SHChangeNotify( _
    ByVal wEventID As HChangeNotifyEventID, _
    ByVal uFlags As HChangeNotifyFlags, _
    ByVal dwItem1 As IntPtr, _
    ByVal dwItem2 As IntPtr)
    End Sub

!!!!User-Defined Types:
enum HChangeNotifyEventID
enum HChangeNotifyFlags

!!!!Notes:
None.

!!!!Tips & Tricks:
Please add some!

!!!!C# Sample Code:
		private void CheckFileAssociation(string ExePath, string FileExt, string Description, string Icon, string ActionName, string FileCommand, string DDECommandString, string App, string Topic)
		{
			RegistryKey RegKey = Registry.ClassesRoot.CreateSubKey("." + FileExt);
			RegKey.SetValue("", FileExt + "File");
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + "File");
			RegKey.SetValue("", Description);
			RegKey.SetValue("EditFlags", 0);
			RegKey.SetValue("BrowserFlags", 8);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\DefaultIcon");
			RegKey.SetValue("", Icon, RegistryValueKind.ExpandString);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell");
			RegKey.SetValue("", FileCommand);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell\" + FileCommand);
			RegKey.SetValue("", ActionName);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell\" + FileCommand + @"\command");
			RegKey.SetValue("", "\"" + ExePath + "\"");
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell\" + FileCommand + @"\ddeexec");
			RegKey.SetValue("", DDECommandString);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell\" + FileCommand + @"\ddeexec\Application");
			RegKey.SetValue("", App);
			RegKey = Registry.ClassesRoot.CreateSubKey(FileExt + @"File\shell\" + FileCommand + @"\ddeexec\Topic");
			RegKey.SetValue("", Topic);
			//credits to pinvoke.net
			SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED, HChangeNotifyFlags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
		}

CheckFileAssociation(
				Application.ExecutablePath, //Application exe path
				"mcl", //Document file extension
				"Celerity Message ControL file", //Document type description
				@"%SystemRoot%\system32\shell32.dll,-152", //Document type icon
				"Open MCL File", //Action name
				"Open", //File command
				"[OpenMCL(\"%1\")]", //DDE command string
				"CelerityEDIToolbox", //Application
				"System"); //Topic

!!!!VB Sample Code:
    Private Sub SetFileAssociation( _
        ByVal FileExt As String, _
        ByVal FileClass As String, _
        ByVal Description As String, _
        ByVal Icon As String, _
        ByVal Verb As String, _
        ByVal VerbDescription As String, _
        ByVal Command As String _
        )

Dim RegKey As RegistryKey = Registry.ClassesRoot.CreateSubKey("." + FileExt)
        RegKey.SetValue("", FileClass)

Dim RegKeyClass = Registry.ClassesRoot.CreateSubKey(FileClass)
        RegKeyClass.SetValue("", Description)
        If (Not Icon Is Nothing) Then
            RegKey = RegKeyClass.CreateSubKey("DefaultIcon")
            'RegistryValueKind is only supported on CLR 2.0
            'RegKey.SetValue("", Icon, RegistryValueKind.ExpandString)
            RegKey.SetValue("", Icon)
        End If

RegKey = RegKeyClass.CreateSubKey("shell")
        RegKey = RegKeyClass.CreateSubKey("shell\" + Verb)
        If (Not VerbDescription Is Nothing) Then
            RegKey.SetValue("", VerbDescription)
        End If
        RegKey = RegKeyClass.CreateSubKey("shell\" + Verb + "\command")
        RegKey.SetValue("", Command)

SHChangeNotify(HChangeNotifyEventID.SHCNE_ASSOCCHANGED, HChangeNotifyFlags.SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero)
    End Sub

Dim Path As String = Application.ExecutablePath
    SetFileAssociation( _
            "aaa", _
            "Association.Sample.0", _
            "File Associations Sample", _
            """" + Path + """,0", _
            "open", _
            Nothing, _
            """" + Path + """ ""%1""")
      
!!!!Alternative Managed API:
Do you know one?  Please contribute it!

Documentation: SHChangeNotify@msdn on MSDN