Question

I’ve been reading up on WPF data binding, looking for simple examples of how to bind, say, a string, to say, a TextBlock so when the value of the string changes so does the TextBlock..

Many web examples I’ve found look like this . . .

 public partial class Window1 : Window
 {
     public Window1()
     {
         InitializeComponent();
         this.DataContext = new Person { FirstName="Rowan" };
     }
 }

 public class Person
 {
     public String FirstName { get; set; }
     public String LastName { get; set; }
 }

… with the propertie(s) of the class being assigned in the “new” statement. So how do I set FirstName to something else later during runtime? Does doing a

this.DataContext = new Person { FirstName="Rowan" };

instantiate an object of type Person whose properties and methods can be accessed like any other object, the way that

Person a_person = new Person { FirstName="Rowan" };  

…would? If so, then how do I access it?

Thanks in advance.

Answer 1

I believe you want something like this:

 public partial class Window1 : Window
 {
     Person GoodPerson{get;set;}
     public Window1()
     {
         InitializeComponent();
         GoodPerson = new Person { FirstName="Rowan" };
         this.DataContext = GoodPerson;
         GoodPerson.FirstName="Rand";
     }
 }

Although for your TextBlock to be notified of changes to the property your Person class will need to implement INotifyPropertyChanged