Trap Event of Class and tie to Method

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I have a assembly from a third party that exposes an Event
I want to Trap the event and tie to a Method in a Class where I am consuming
their assembly. The class is actually a UserControl

How can I tie OnSettingsModif ied from the assembly to Method
Configuration_O nValid in my class ????

Thanks


Third Party App
============
public interface ISettings
{

event EventHandler OnSettingsModif ied;
}


public Class Settings: ISettings
{
private void textEdit_EditVa lueChanged(obje ct sender, EventArgs e)
{
if (OnSettingsModi fied != null)
{
OnSettingsModif ied.Invoke(send er, e);
}

}

}

My App
======

Settings mySettings - new Settings();

private void Configuration_O nValid(object sender, System.EventArg s e)
{
UpdateEnableSav e();
}

[Jialiang Ge [MSFT]]

RE: Trap Event of Class and tie to Method

Good morning sippyuconn.

The method of tying OnSettingsModif ied from the assembly to
Configuration_O nValid depends on how Settings implements the ISettings
interface: either explicitly or implicitly. I will go through each
possibility with you and provide the solution respectively.

=============== =============== =======
Possibility 1: 'Settings' IMPLICITLY implements 'ISettings'

public interface ISettings
{
event EventHandler OnSettingsModif ied;
}

public class Settings : ISettings
{
private void textEdit_EditVa lueChanged(obje ct sender, EventArgs e)
{
if (OnSettingsModi fied != null)
{
OnSettingsModif ied.Invoke(send er, e);
}
}

#region ISettings Members

public event EventHandler OnSettingsModif ied;

#endregion
}

The code "public event EventHandler OnSettingsModif ied;" tells that
'Settings' is implicitly implementing 'ISettings', and the event is a part
of the class, so we can add the event handler by writing this code:

Settings mySettings = new Settings();
mySettings.OnSe ttingsModified += new EventHandler(Co nfiguration_OnV alid);

=============== =============== =======
Possibility 2: 'Settings' EXPLICITLY implements 'ISettings'

public class Settings : ISettings
{
public void textEdit_EditVa lueChanged(obje ct sender, EventArgs e)
{
if (OnSettingsModi fied != null)
{
OnSettingsModif ied.Invoke(send er, e);
}
}

event EventHandler OnSettingsModif ied;

#region ISettings Members

event EventHandler ISettings.OnSet tingsModified
{
add
{
lock (OnSettingsModi fied)
{
OnSettingsModif ied += value;
}
}
remove
{
lock (OnSettingsModi fied)
{
OnSettingsModif ied -= value;
}
}
}

#endregion
}

In this implementation, the event OnSettingsModif ied is not exposed as a
public event from the class 'Settings', thus, we cannot tie the event
handler in the same way as "possibilit y 1". The event is a part of the
interface, so the right way to add the event handler is:

Settings mySettings = new Settings();
ISettings iSettings = (ISettings)mySe ttings;
iSettings.OnSet tingsModified += new EventHandler(Co nfiguration_OnV alid);

For more information about explicitly implementing an interface event,
please refer to the MSDN article:
http://msdn.microsoft.com/en-us/libr...46(VS.80).aspx
http://msdn.microsoft.com/en-us/libr...57(VS.80).aspx

sippyuconn, is the above information helpful to you? If it cannot help you
with the question, I appreciate it if you could share more implementation
of the class 'Settings' or send a small reproducible project to my mailbox:
jialge@microsof t.com

Have a very nice day!

Best Regards,
Jialiang Ge (jialge@online. microsoft.com, remove 'online.')
Microsoft Online Community Support

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