C # process the Form Controls in the thread using system Delegation

1. The system. Windows. Forms. methodinvoker type is a system-defined delegate used to call methods without parameters.
Private thread mythread;

Private void form1_load (Object sender, eventargs E)

{

Mythread = new thread (New threadstart (runsonworkerthread ));

Mythread. Start ();

}

Private void runsonworkerthread ()

{

Methodinvoker MI = new methodinvoker (setcontrolsprop );

Begininvoke (MI );

}

Private void setcontrolsprop ()

{

Label1.text = "mythread thread calls UI control ";

}

 

2. directly use system. eventhandle (with parameters)

Private thread mythread;

Private void form1_load (Object sender, eventargs E)

{

Mythread = new thread (New threadstart (runsonworkerthread ));

Mythread. Start ();

}

Private void runsonworkerthread ()

{

// Dosomethingslow ();

String plist = "mythread thread calls UI control ";

Label1.begininvoke (new system. eventhandler (updateui), plist );

}

// Directly use system. eventhandler, and there is no need to customize the delegate

Private void updateui (Object o, system. eventargs E)

{

// Set the label1 attribute in the UI thread

Label1.text = O. tostring () + "successful! ";

}
Iii. Demo program

/// <Summary>
/// Provides the system with the purpose of entrusting event calls to solve the interface controls within the thread
/// </Summary>
/// <Param name = "OBJ"> </param>
/// <Param name = "E"> </param>
Private void updatelistbox (Object OBJ, system. eventargs E)
{
// Force type conversion
List <string> paramlist = (list <string>) OBJ;
If (paramlist [0] = "0 ")
{
This. lstboxcatchdata. Items. Clear ();
}
Else if (paramlist [0] = "1 ")
{
This. lstboxcatchdata. Items. Add (paramlist [1]. tostring ());
}
}

Call part in the thread:

// Initialize the parameter list
List <string> paramlist = new list <string> ();
Paramlist. Add ("0 ");
Paramlist. Add ("");

// The system delegate method is used to implement the interface controls of the operating system in the thread.
Paramlist [0] = "0"; paramlist [1] = "clear screen information ";
Lstboxcatchdata. begininvoke (new system. eventhandler (updatelistbox), paramlist );

End.