TextBlock should have an input from code (xaml, c#)

Question

in an .XAML I wrote

<TextBlock> x words found </TextBlock>

and in my .cs I wrote something like this:

public int number(A a, B b) {
    […]
    return resultsCount;
}

I want x to be resultsCount in this case. How do I link it so x becomes a number of resultsCount?

Answer 1

the simplest solution:

You can set your TextBlock like this:

<TextBlock >
    <Run x:Name="MyRun" Text="0"/> // place for the 'X' of your code
    <Run Text="words found"/>
</TextBlock>

and in the codebehind, you can change the Text of MyRun in your int number(A a, B b) method like this:

public int number(A a, B b)
{
    […]
    MyRun.Text = resultsCount.ToString();
    return resultsCount;

}

Solution that involves data binding:

in this case you should define a property that raises PropertyChanged event on change like this:

public class CodeBehind : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private string simpleString;
    public string SimpleString
    {
        get{ return simpleString; }
        set
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("SimpleString"));
            simpleString = value;
        }
    }
    public int number(A a, B b)
    {
        […]
        return resultsCount;

    }
}

and then simply bind the Text property of MyRun with this SimpleString Property:

<TextBlock >
    <Run x:Name="MyRun" Text="0"/>
    <Run Text="words found"/>
</TextBlock>

Whenever you need to update that "X", in code behind, just do this:

SimpleString = number(a,b).ToString();