public void Execute()
{
var src = new Person();
using (var dest = new DelegateCommand(
() => src.Name = "Done",
() => src.Age > 0
)) {
var count = 0;
dest.Refresh();
dest.CanExecuteChanged += (s, e) => ++ count;
dest.Associate(src);
Assert.That(dest.CanExecute(), Is.False);
Assert.That(count, Is.EqualTo(0));
src.Age = 10;
Assert.That(dest.CanExecute(), Is.True);
Assert.That(count, Is.EqualTo(1));
src.Age = -20;
Assert.That(dest.CanExecute(), Is.False);
Assert.That(count, Is.EqualTo(2));
dest.Refresh();
dest.Execute();
Assert.That(src.Name, Is.EqualTo("Done"));
Assert.That(count, Is.EqualTo(4));
}
}
public void Execute_Generic()
{
var src = new Person();
using (var dest = new DelegateCommand <int>(
e => src.Name = $"Done:{e}",
e => e > 0 && src.Age > 0
)) {
var count = 0;
dest.Refresh();
dest.CanExecuteChanged += (s, e) => ++ count;
dest.Associate(src);
Assert.That(dest.CanExecute(-10), Is.False);
Assert.That(dest.CanExecute(10), Is.False);
Assert.That(count, Is.EqualTo(0));
src.Age = 10;
Assert.That(dest.CanExecute(-20), Is.False);
Assert.That(dest.CanExecute(20), Is.True);
Assert.That(count, Is.EqualTo(1));
src.Age = -20;
Assert.That(dest.CanExecute(-30), Is.False);
Assert.That(dest.CanExecute(30), Is.False);
Assert.That(count, Is.EqualTo(2));
dest.Refresh();
dest.Execute(40);
Assert.That(src.Name, Is.EqualTo("Done:40"));
Assert.That(count, Is.EqualTo(4));
}
}