ProcessKeyMessage Method

MaskedTextBox.ProcessKeyMessage Method

Overrides the base implementation of this method to handle input language changes.

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

[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
protected internal override bool ProcessKeyMessage(
	ref Message m
)

Parameters

m
Type: System.Windows.Forms.Message%
A Message, passed by reference that represents the window message to process.

Return Value

Type: System.Boolean
true if the message was processed by the control; otherwise, false.

MaskedTextBox overrides its base control's implementation of ProcessKeyMessage to properly handle character events when the user is entering characters using an Input Method Editor (IME), such as is used for entering Japanese, Chinese, and other complex non-Latin scripts. ProcessKeyMessage detects any WM_CHAR messages that occur after it receives a WM_IME_CHAR message and suppresses them in order to prevent these characters from showing up in the control. If you derive from this control and override this message, you should duplicate this behavior if you wish your new control to work with IMEs.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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

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

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