public void MyTestMethod()
{
var a = new MyDependencyObject()
{
PropName = "a"
};
var b = new MyDependencyObject()
{
PropName = "b"
};
var converter = new MyConverter();
b.SetBinding(
MyDependencyObject.MyIntegerProperty,
new Windows.UI.Xaml.Data.Binding
{
Path = new PropertyPath(nameof(b.MyInteger)),
Converter = converter,
Source = a,
Mode = BindingMode.TwoWay
}
);
Assert.AreEqual(1, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, b.MyInteger);
Debug.WriteLine("setting a.MyInteger = 1");
a.MyInteger = 1;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, a.MyInteger);
Assert.AreEqual(2, b.MyInteger);
Debug.WriteLine("setting b.MyInteger = 2");
b.MyInteger = 2;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, a.MyInteger);
Assert.AreEqual(2, b.MyInteger);
Debug.WriteLine("setting b.MyInteger = 3");
b.MyInteger = 3;
Assert.AreEqual(3, converter.ConvertCallCount);
Assert.AreEqual(1, converter.ConvertBackCallCount);
Assert.AreEqual(3, a.MyInteger);
Assert.AreEqual(3, b.MyInteger);
a.MyInteger = 42;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(2, converter.ConvertBackCallCount);
Assert.AreEqual(42, a.MyInteger);
Assert.AreEqual(42, b.MyInteger);
}
public void When_TwoWay_Converted()
{
var a = new MyDependencyObject()
{
PropName = "a"
};
var b = new MyDependencyObject()
{
PropName = "b"
};
var converter = new MyConverter();
BindingOperations.SetBinding(b,
MyDependencyObject.MyIntegerProperty,
new Windows.UI.Xaml.Data.Binding
{
Path = new PropertyPath(nameof(b.MyInteger)),
Converter = converter,
Source = a,
Mode = BindingMode.TwoWay
}
);
Assert.AreEqual(1, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, b.MyInteger);
a.MyInteger = 1;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, a.MyInteger);
Assert.AreEqual(2, b.MyInteger);
b.MyInteger = 2;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(0, converter.ConvertBackCallCount);
Assert.AreEqual(1, a.MyInteger);
Assert.AreEqual(2, b.MyInteger);
b.MyInteger = 3;
Assert.AreEqual(2, converter.ConvertCallCount);
Assert.AreEqual(1, converter.ConvertBackCallCount);
Assert.AreEqual(3, a.MyInteger);
Assert.AreEqual(3, b.MyInteger);
a.MyInteger = 42;
Assert.AreEqual(3, converter.ConvertCallCount);
Assert.AreEqual(1, converter.ConvertBackCallCount);
Assert.AreEqual(42, a.MyInteger);
Assert.AreEqual(43, b.MyInteger);
}