How to send property values via eventhandler ?

AtaChris

public class Person : INotifyPropertyChanged
{
private string name;

public event PropertyChangedEventHandler PropertyChanged;

public string Name
{
    get { return name; }
    set
    {
        object before = Name;
        name = value;
        OnPropertyChanged("Name", before, Name);
    }
}

void OnPropertyChanged(PropertyChangedEventArgs e, object? argvaluebefore = null, object? argnewvalue = null, \[CallerMemberName\] string argcallername = "", \[CallerLineNumber\] int argcallerline = 0)
{
    //How can I inject argvaluebefore and argvalue here ?
	
	PropertyChanged?.Invoke(this, e);
}

}

public class Master
{

Person \_person = new();


public Master()
{

	\_person.PropertyChanged += MyHandler;


}


private void MyHandler(object? sender, PropertyChangedEventArgs e)
{

	//How do I retrieve the curent values of property Name here plus the value before ?

}

}

Hello, I need to retrieve the propery values of class Person in MyHandler of Class Master. Any ideas what I should do ? Regards, Chris

OriginalGriff

You already have this posted in QA: don't post the same question in two places - all you will do is duplicate work and annoy people. Pick either the C# forum or the Q&A and stick with it. Annoyed people are less likely to be helpful than happy ones...

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt AntiTwitter: @DalekDave is now a follower!

AtaChris

Yea, the following code was one of the examples I tried:

if (e.KeyCode == Keys.F1 && (e.Alt || e.Control || e.Shift))
{
//do sth
}

It is from the source you mentioned, but i does not work. Compiler says that

KeyEventArgs

does not contain a definition for Alt etc. Also there is no suggestion of how to fix it. These are my usings: using System; using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Reflection; using System.Windows.Forms;

OriginalGriff

That's because they don't generate keycodes: ALT on it's own does nothing, it needs a keystroke to make it useful - ALT+F2, CTRL+F4 for example. They are MODIFIER keys[^].

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony "Common sense is so rare these days, it should be classified as a super power" - Random T-shirt AntiTwitter: @DalekDave is now a follower!