Modifier

ControlDesigner.WndProc(Message) Method

  • Reference

Definition

Namespace:
System.Windows.Forms.Design
Assembly:
System.Design.dll
Assembly:
System.Windows.Forms.Design.dll

Processes Windows messages and optionally routes them to the control.

protected:
 virtual void WndProc(System::Windows::Forms::Message % m);
protected virtual void WndProc (ref System.Windows.Forms.Message m);
abstract member WndProc : Message -> unit
override this.WndProc : Message -> unit
Protected Overridable Sub WndProc (ByRef m As Message)

Parameters

m
Message

The Message to process.

Remarks

This method is called for each message the control would usually receive. This allows the designer to preprocess messages before optionally routing them to the control.

To send the message to the control's Control.WndProc method, call WndProc on the control's designer.

Note

The designer filters messages, so some messages will not be sent to the control. For example, mouse messages are intercepted by the designer. If this is not the behavior you want, call DefWndProc instead.

Pass m as a parameter. Optionally, you can alter or create a new System.Windows.Forms.Message to pass to the control's method.

The following table shows the flow of messages.

Without a designer With a designer
USER32

Control.WndProc

Control.DefWndProc

USER32		 USER32

Control.Designer. WndProc

DefWndProc

Control.WndProc

Control.DefWndProc

USER32

The designer intercepts messages by replacing the Control.WindowTarget property on the control. Usually, WindowTarget points to the NativeWindow contained within the control. During design time, the designer replaces this with its own window target, and caches the original value.

Applies to

See also