This documentation is archived and is not being maintained.

Control.CreateParams Property

Gets the required creation parameters when the control handle is created.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

'Declaration
Protected Overridable ReadOnly Property CreateParams As CreateParams
'Usage
Dim value As CreateParams 

value = Me.CreateParams

Property Value

Type: System.Windows.Forms.CreateParams
A CreateParams that contains the required creation parameters when the handle to the control is created.

The CreateParams property should not be overridden and used to adjust the properties of your derived control. Properties such as the CreateParams.Caption, CreateParams.Width, and CreateParams.Height should be set by the corresponding properties in your control such as Control.Text, Control.Width and Control.Height. The CreateParams should only be extended when you are wrapping a standard Windows control class or to set styles not provided by the Windows Forms namespace. For more information about creating control parameters, see the CreateWindow and CreateWindowEx functions and the CREATESTRUCT structure documentation in the MSDN library at http://msdn.microsoft.com/library.

Notes to Inheritors:

When overriding the CreateParams property in a derived class, use the base class's CreateParams property to extend the base implementation. Otherwise, you must provide all the implementation.

The following code example extends the CreateParams property of a Button derived class. The CreateParams.Style property is changed, which causes the button to display an Icon rather than an Image. This example requires that you have a class that inherits from the Button class.

Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
    Get 
        Dim SecPerm As New SecurityPermission(SecurityPermissionFlag.UnmanagedCode)
        SecPerm.Demand()

        ' Extend the CreateParams property of the Button class. 
        Dim cp As System.Windows.Forms.CreateParams = MyBase.CreateParams
        ' Update the button Style.
        cp.Style = cp.Style Or &H40 ' BS_ICON value

        Return cp
    End Get 
End Property

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
Show: