c# - Nothing happening when you click second time -


i having terrible when execute same method second time.i not getting wpf screen, don't know why? refer code

testwindow button click method(it windows application project type) , have removed sta thread in

main()

testclass test;

private void button1_click(object sender, eventargs e) {     test =testclass.instance; //singleton pattern     test.showscreen(); }

testclass 

public void showscreen() {     var thread = new thread(() =>         {             explorer explorer = new explorer();             explorer.show();             explorer.closed += (s, args) =>                 explorer.dispatcher.invokeshutdown();              system.windows.threading.dispatcher.run();         });         thread.setapartmentstate(apartmentstate.sta);         thread.start();               }

above code working fine when run 1st time. can able view explorer screen. problem when close 1st screen , call once again same method(test.showscreen();) explorer screen not showing

note : have noticed if didn't close 1st window(instance) can able open many explorer screen. using same code. if closed 1st window(instance) , unable open explorer screen , not getting error message.

the issue resolved adding following line in testclass constructors

using sw = system.windows;

private testclass() {     if (sw.application.current == null)     {         new sw.application         {             shutdownmode = sw.shutdownmode.onexplicitshutdown         };     } }

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