Bind WPF control with property of custom type

Question

Hello everyone,

I'm trying to bind a Label's 'Content' property to a property from some custom type I have; unfortunately, I didn't figure out how to do it, and that's why I'm here :)

Let's assume that I have the following type (can be in the same namespace as my WPF Window that contains the Label or different namespace):

namespace MyNS
{
    pubic class Person
    {
        private int age = 0;

        public int Age
        {
            get { return age; }
        }

        public void GetOlder
        {
            age++;
        }
    }
}

1) How to I bind my Label to 'Age' property?

2) At runtime I will create an instance of 'Person'; I want to make sure that my Label is bound to the right instance; i.e. if I called:

Person SomePerson = new Person();
SomePerson.GetOlder();

I want my Lable to have the new value of 'Age' property for 'SomePerson'.

3) What if I called 'GetOlder' in different thread (whether using Dispatcher thread or BackgroundWorker)? Will I still get the latest value of 'Age'? Or do I have to take care of some other things as well to make this scenario possible?

Thanks in advance,

TheBlueSky

Answer 1

It turned out to be kind of straightforward thing, I wonder why nobody answered it :) Anyway, here are the answers:

1) First we need to create our Person class like this:

using System.ComponentModel;

namespace MyNS
{
    pubic class Person : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private int age = 0;

        public int Age
        {
            get { return age; }
            set
            {
                age = value;
                OnPropertyChanged("Age");
            }
        }

        protected void OnPropertyChanged(string PropertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(PropertyName));
            }
        }

        public void GetOlder
        {
            Age++;
        }
    }
}

2) Then we bind our WPF control to Person.Age property like this:

using System.Windows.Data;

//...

Person p = new Person();
Binding ageBinding = new Binding("Age");
ageBinding.Source = p;
MyWpfLabelControl.SetBinding(Label.ContentProperty, ageBinding);

Now whenever p.GetOlder() is called MyWpfLabelControl.Content will change to the new p.Age value.

3) In multi-threading, the story is not different; it'll work the same way when calling p.GetOlder() in a different thread:

new Thread(
    new ThreadStart(
        delegate() {
            p.GetOlder();
        }
)).Start();

Hope this helps.

TheBlueSky