c# - Override event in UIElement initialization statement -

i created secondarywindow dynamically has windowstyle set none. hence, want set content dragmove-able overriding onmouseleftbuttondown.

i not figure out how include override function within secondarywindow initialization statement

public class mainwindow {     window secondarywindow = new window     {         windowstyle = system.windows.windowstyle.none,         content = new myusercontrol(),         topmost = true,                // failed attempt         base.onmouseleftbuttondown += (object sender, mousebuttoneventargs e) =>         {             base.onmouseleftbuttondown(e);             base.dragmove();         }     }; } 

your question more asked 'how add handler event in object initializer?'. 'object initializer' refers syntax this:

foo newfow = new foo {    foo.property = somevalue }; 

just make sure don't misunderstand something, onmouseleftbuttondown += smth not override event, adds event handler event.

that being said: can't. c# doesn't support registering handlers on events in object initializer:

// not possible foo newfoo = new foo {      event += somehandler }; 

neither c# let set event:

// not possible foo newfoo = new foo {    event = somedelegate }; 

however, can work around limitation, wrapping event of class secondarywindow in property:

public class secondarywindow : window {    public mousebuttoneventhandler mouseleftbuttondownsubscriber    {       set { mouseleftbuttondown += value; }    } } 

no can initialize object this:

window secondarywindow = new window {     windowstyle = system.windows.windowstyle.none,     content = new myusercontrol(),     topmost = true,     mouseleftbuttondownsubscriber = (object sender, mousebuttoneventargs e) =>     {         base.onmouseleftbuttondown(e);         base.dragmove();     } }; 

i not recommend though, adds confusion people not familiar code , there no reason this, apart convenience of using object initializer. recommend initialize object , set properties in initializers, subscribe events 1 expect it, example in constructor of parent window.