How to assign a string to a TextBlock?

Question

Does anyone know how to assign a string to a textblock?

e.x. I have a string, with variable content, and a textBlock. The text of the textBlock should always match the content of the string.

string number;

public MainPage()
{
    //the textBlock text should now be "1"
    number = "1";

    //the textBlock text should now be "second"
    number = "second";
}

I tryed to do this automatically with bindings, but I couldn't find a solution.

regards, Cristian

Answer 1

For Databinding to work you need to have a a Property and not just a simple member variable. And your Datacontext class has to implement the INotifyPropertyChanged Interface.

public class MyDataContext : INotifyPropertyChanged

    private string number;
    public string Number {
        get {return number;}
        set {number = value; NotifyPropertyChanged("Number");}
    }

// implement the interface of INotifyPropertyChanged here
// ....
}


public class MainWindow() : Window
{
     private MyDataContext ctx = new MyDataContext();

     //This thing is out of my head, so please don't nail me on the details
     //but you should get the idea ...
     private void InitializeComponent() {
        //...
        //... some other initialization stuff
        //...

        this.Datacontext = ctx;
     }

}

And you may use this in the XAML as following

<Window ...>
    <!-- some other controls etc. -->
    <TextBlock Text={Binding Number} />
    <!-- ... -->
</Window>