c# - How to trigger the setter of a property of an enum when passing as parameter? -

imagine have property , private field:

private messageboxresult donotuseme_result;  public messageboxresult myresult {     { return donotuseme_result; }     set     {         donotuseme_result = value;     } } 

messageboxresult enum used result of messagebox (wpf). nevertheless getting problems when passing myresult methods, because automatically uses value type of enum , changed results getting collected gc, because totally new variable specified inside scope of method (taskbasedshow)...

my current setup:

public delegate void onresult(messageboxresult res);  private messageboxresult donotuseme_result;  public mainwindow() {     initializecomponent();      onres += messagebox_onres;      taskbasedshow("my message", "my caption", messageboxbutton.yesno, messageboximage.question, myresult); }  public messageboxresult myresult {     { return donotuseme_result; }     set     {         donotuseme_result = value;         onres?.invoke(value);     } }   public void taskbasedshow(string message, string caption, messageboxbutton buttons,         messageboximage image, messageboxresult resultprop) {     task.factory.startnew(() => { resultprop = messagebox.show(message, caption, buttons, image); }); }  /// <summary> ///     getting triggered after user pressed button. /// </summary> /// <param name="res">the pressed button.</param> private void messagebox_onres(messageboxresult res) {     messagebox.show(res.tostring()); }   public event onresult onres; 

i have read following documentations:

• https://msdn.microsoft.com/en-us/library/sbbt4032.aspx
• https://msdn.microsoft.com/en-us/library/cc138362.aspx

but seems enum not provide set(value) method.

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the problem:

when setting variable of property of enum (inside mothod), setter not triggered , therefore custom events.

what should do:

it should trigger onres when setting property because setter getting triggered , therefore subscribers of onresult event. working example:

public mainwindow() {     initializecomponent();      onres += messagebox_onres;      myresult = messageboxresult.cancel; } 

it open messagebox displaying "cancel".

note:

one solution using property inside taskbasedshow:

task.factory.startnew(() => { myresult = messagebox.show(message, caption, buttons, image); }); 

because uses reference type , not passed value type.

you should use callback result value back

public async void taskbasedshow(      string message,      string caption,      messageboxbutton buttons,     messageboximage image,      action<messageboxresult> resultcallback) {     var result = await task.run(() => messagebox.show(message, caption, buttons, image ) );     resultcallback( result ); } 

and call like

taskbasedshow(     "my message",      "my caption",      messageboxbutton.yesno,      messageboximage.question,      r => myresult = r );