Question

I have made a Base Form which is inherited by most Forms in the application. Base form contains a Status Bar Control that displays user name which is internally a static string.

User can Switch User at any point in the application by pressing a button on status bar. At this point the user name in the status bar should also change, as if now it only changes in code and UI has no idea about the change. I have googled around and found that i need to bind the label with that static string by implementing a INotifyProperty Interface. I have implemented many example code without success.

Appreciate any help

Answer 1

You must implement a class to notify prop changed and therefore the prop can not be static. Combine with a singleton pattern and you have yout solution.

public class Global : INotifyPropertyChanged
{
    private string _userName;

    public string UserName
    {
        get
        {
            return this._userName;
        }
        set
        {
            if (this._userName == value)
            {
                return;
            }

            this._userName = value;

            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs("UserName"));
            }
        {
    }

    public event PropertyChangedEventHandler PropertyChanged;

    private Global() {}

    public static readonly Global Get = new Global();
}

Usage:

var currUserName = Global.Get.UserName;

Global.Get.PropertyChanged += (s, e) => Console.WriteLine(e.PropertyName);
Global.Get.UserName = "John";

And bind to Global.Get to property UserName.