Dispatcher.begininvoke is not triggering in WPF

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WPF

I am new to WPF and i am trying to create a WPF form and trying to call from another application . I am converting the WPF output as class libarary and calling from another Solution .

There is a .cs file which call this wpf window from code behind using below code .

````
Thread thre = new thread(()=> 
{
mainwindow md = new mainwindow();
md.ShowDialog();
md.Closed+=(s,e)=> md.dispatcher.InvokeShutdown();
Dispatcher.Run()
});
thre.SetApartmentState(ApartmentState.STA);
thre.Start();```

`
I Can able to call my window and all my functionality working excel the dispachter.beginInvoke is not triggering .And i also get Application.Current =null . I am unable to go to if statement in the below code.

Method in window.cs

new Thread(()=>
{
rsult= getItemID("44");
Dispatcher.BeginInvoke( new ThreadStart(()=>{
if(rsult==0)
{}
});
}).Start();
}
````

What I have tried:

I followed the sample code which is working fine but if i copy the same code its not working in my application.