Note: This API is now obsolete.
Contains dynamic registry data. This field reads the Windows registry base key HKEY_DYN_DATA.
Assembly: mscorlib (in mscorlib.dll)
The operating system does not support dynamic data; that is, it is not Windows 98, Windows 98 Second Edition, or Windows Millennium Edition (Windows Me).
The Windows 98/Windows Me registry supports both static data (which is stored on disk in the registry) and dynamic data (which changes frequently, such as performance statistics). This dynamic data area is the mechanism that allows Virtual Device Drivers (VxDs) to provide real-time data to Win32 applications that can run remotely as well as locally. It also allows the system monitor to provide performance statistics on remote Windows 98/Windows Me systems.
VxDs are not limited to performance data. They can provide any data they want to pass from Ring 0 to Ring 3 efficiently without monopolizing the CPU. The registry supports dynamic data by storing a pointer to a function that returns a value (or many values). When a Registry call queries values associated with a dynamic key, that function is called to return the desired value or values.
Dynamic keys were introduced in Microsoft Windows 95 to handle dynamic Registry data. They are supported only in Windows 98/Windows Me.
The following example demonstrates how to retrieve the subkeys of this key, and prints their names to the screen. Use the OpenSubKey method to create an instance of the particular subkey of interest. You can then use other operations in RegistryKey to manipulate that key. Note that this example can return no results, since there might not be dynamic data available, or you might not be running Windows 98/ME. Using this key may cause an error on other systems.
Imports System Imports Microsoft.Win32 Class Reg Public Shared Sub Main() ' Create a RegistryKey, which will access the HKEY_DYN_DATA ' key in the registry of this machine. Dim rk As RegistryKey = Registry.DynData ' Print out the keys. PrintKeys(rk) End Sub Shared Sub PrintKeys(rkey As RegistryKey) ' Retrieve all the subkeys for the specified key. Dim names As String() Try names = rkey.GetSubKeyNames() Catch ex As System.IO.IOException Console.WriteLine("HKEY_DYN_DATA is not available on this machine.") Exit Sub End Try Dim icount As Integer = 0 Console.WriteLine("Subkeys of " & rkey.Name) Console.WriteLine("-----------------------------------------------") ' Print the contents of the array to the console. Dim s As String For Each s In names Console.WriteLine(s) ' The following code puts a limit on the number ' of keys displayed. Comment it out to print the ' complete list. icount += 1 If icount >= 10 Then Exit For End If Next s End Sub End Class
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2