VoIP PBX

Sooner or later you'll develop an application that makes use of threads to perform background tasks.
Maybe if you have never used the Threads, I recommend this article (in English) An Introduction to Programming with C # Threads

Dell'Invoke The problem occurs when you try to update the UI of a form from a thread. Indeed. NET allows the invocation of the function object System.Windows.Forms.Control only by the thread where the object was created. To overcome this obstacle we need to use the functions Control.Invoke (synchronous call) or Control.BeginInvoke (asynchronous call). Normally, our approach would be to write for many delegates who are the objects to invoke methods or to update:
delegate void AggiungiListboxDelegate(string msg);
[...]
if (this.InvokeRequired) {
Invoke(new AggiungiListboxDelegate(AggiungiAListBox), new object[] { itm } );
}
else
{
AggiungiAListBox(itm);
}


However, there is an easier method for use in general in most cases. We write the generic delegates receive:

• or object, the name of the property to be valued and the new value to assign
• or object, the method name to invoke and pass parameters to the method

delegate void SetPropertyDelegate(object ctl, string objName, object newValue);
delegate void SetMethodDelegate(object obj, string methodName, object[] parameters);
[...]

void SetProperty(object ctl, string propName, object newValue) {
Type t = ctl.GetType();
PropertyInfo pi = t.GetProperty(propName);

if (pi! = null) (
pi.SetValue (ctl, newValue, null);
)
)
SetMethod void (object ctl, string methodName, object [] parameters) (
Type t = ctl.GetType ();
MethodInfo mi = t.GetMethod (methodName);

if (me! = null) (
mi.Invoke (ctl, parameters);
)
)
An example of usage:

Invoke(new SetPropertyDelegate(SetProperty), new object[] { (object)lblErrMessage, "Text", errmsg });

oppure

Invoke(new SetMethodDelegate(SetMethod), new object[] { (object)this, "Close", (new object[] {}) } );

To you the burden of improving the idea

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Development of IVR systems, call centers, PBX Voip.

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