WPF – Using Data Triggers

Data triggers are a great feature of WPF. They allow you to change the style properties of a control depending on the data of the bound items of that control.

In this tutorial, I am going to bind a set of data to a ListBox, and use Data Triggers to let me know when something is wrong.

So first, I am going to create a Person class. This class will have three public properties: Name, Age, and IsValid. All three properties will be readonly. The IsValid property will return whether the data of the class is good or not.

public class Person

{

    private string name;

 

    public string Name

    {

        get { return name; }

        private set { name = value; }

    }

    private int age;

 

    public int Age

    {

        get { return age; }

        private set { age = value; }

    }

 

    public bool IsValid

    {

        // will return false if either the name is blank

        //   or if the age is 0.

        get { return (!string.IsNullOrEmpty(name) && age != 0); }

    }

 

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