Object of type 'System.Int32' cannot be converted to type 'System.Object[]'

Question

GentleMen

Object of type 'System.Int32' cannot be converted to type 'System.Object[]'.
Is The Error I am Getting In c#.
I need Immediate Remedy Please

class SomeClass
{

public delegate void SomeDel ( params object[] Params_list );

public void SomeFunc(params object[] Params_List)
{
  // Updates Value Of Some Treeview According To Value Recieved
}

public void SomeThreadFunc()
{
   SomeDel a ;

   a = SomeFunc ;

   object[] Params_List = new object[1];

   Params_List.setvalue(0,1);

   this.invoke( a, Params_List); // Here Is Where Comes The Error
                                 // Althou i Have Tried new object[] {1}
                                 // but with no respite
  
}
 
}

It Compiles Well But While Runing It Creates Problems
what am i doing wrong how to go about it

Thankyou
RIGHT_THEN

Alan · Answer

Well the 'standard' solution here would be: this.Invoke(a new object[]{Params_List}); because the second parameter of Invoke is an object array of parameters to the 'a' delegate and the first (and only) such parameter is itself an object array. However the reason why the following also works: this.Invoke(a (object)Params_List); is because the second parameter to Invoke is a parameter array and you can therefore supply it with a list of object references (in this case just one) rather than an object array reference. Moreover because all types inherit from object then (somewhat paradoxically) even an object[] can be cast to an object!

tot2ivn · Answer

Thank you guys !! It solved my problem too. :) Totti

RIGHT THEN · Answer

Sir Mr. Dr. Spack You were Right!!! Althou i had placed and checked the code before too but when it gets multithreaded control remains in the primary thread while debugging unless we place a breakpoint in secondary thread too so i placed try and catcth in secondary thread too and there the culprit was found. Your Diagnostic about the situation was right and comes as a lesson to me that debugging mulithreaded application could be problemetic. i think i will have to make all those mistakes again just to be sure if they actually were mistakes since the bug has been found. That i had not discarded the right things for wrong at some other place. Regards and million thanks Gratefully RIGHT_THEN

Dr Spack · Answer

Hi RIGHT_THEN I think that the Invoke call is just working and your function (SomeFunc) does throw that exception. So I would set a breakpoint in that function and debug it. Or add a try-catch block to check that out.

RIGHT THEN · Answer

Mr.Alan And Dr. Spack ThankYou GentleMen For Your Time But None of those solutions is Working for me Here are The Errors That I recieve this.Invoke( a  (object) Param_list1 ) ; System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object. Source=System.Windows.Forms StackTrace: at System.Windows.Forms.Control.MarshaledInvoke(Control caller Delegate method Object[] args Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method Object[] args) at BankReports.ProcessAndThreads.KeepUpdatingProcessTHREADPROC() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext ContextCallback callback Object state) at System.Threading.ThreadHelper.ThreadStart() this.Invoke( a  new object[] {Param_list1 } ) ; System.NullReferenceException was unhandled Message=Object reference not set to an instance of an object. Source=System.Windows.Forms StackTrace: at System.Windows.Forms.Control.MarshaledInvoke(Control caller Delegate method Object[] args Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method Object[] args) at BankReports.ProcessAndThreads.KeepUpdatingProcessTHREADPROC() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext ContextCallback callback Object state) at System.Threading.ThreadHelper.ThreadStart() Before Putting This Post i had tried all this And here is another execption i even tried this this.Invoke( a  new object[] {1hey3.00 } ) ; This time it gives some error about Parameter count Gentlemen It could be vicious but i need a solution to this so what do i do now elaborate more on my code to you gentlemen Thankyou RIGHT_THEN

Dr Spack · Answer

Hi Alan it took me a while but now I've got it. ;) Thank you!

Dr Spack · Answer

Hi that is a strange thing but I have a solution: this.Invoke( a (object) Params_List ); Just add (object) and it will work! Why? I don't know. Maybe someone else does know an explanation for that!?