Let usercontrol process the arrow key

I wroteUsercontrol,Need to handleArrow keys. (Up, down, left, right ).However, these four keys belongDialogkeyThere are two solutions to makeUsercontrolInOnkeydownTo process these four keys.

Solution 1:

Heavy LoadProcessdialogkey.

Protected Override BoolProcessdialogkey (KeysKeydata)

{

If(Keydata =Keys. Up | keydata =Keys. Down

| Keydata =Keys. Left | keydata =Keys. Right)

Return False;

Else

Return Base. Processdialogkey (keydata );

}

 

Solution 2:

Heavy LoadProcesskeypreview, MandatoryAddKeyMessage event distribution logic; then reloadIsinputkey.

Protected Override BoolProcesskeypreview (RefMessage m)

{

If(Base. Processkeyeventargs (RefM ))

{

Return True;

}

Return Base. Processkeypreview (RefM );

 }

Protected Override BoolIsinputkey (Keys keydata)

{

If(This. Focused)

{

Keys keys1 = (keydata & keys. keycode );

Switch(Keys1)

{

CaseKeys. Up:

CaseKeys. down:

CaseKeys. left:

CaseKeys. Right:

{

Return True;

}

}

}

Return Base. Isinputkey (keydata );

}