public void Should_Not_Write_To_Old_DataContext()
{
var vm = new OldDataContextViewModel();
var target = new TestSelector();
var itemsBinding = new Binding
{
Path = "Items",
Mode = BindingMode.OneWay,
};
var selectedItemsBinding = new Binding
{
Path = "SelectedItems",
Mode = BindingMode.OneWay,
};
// Bind Items and SelectedItems to the VM.
target.Bind(TestSelector.ItemsProperty, itemsBinding);
target.Bind(TestSelector.SelectedItemsProperty, selectedItemsBinding);
// Set DataContext and SelectedIndex
target.DataContext = vm;
target.SelectedIndex = 1;
// Make sure SelectedItems are written back to VM.
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Clear DataContext and ensure that SelectedItems is still set in the VM.
target.DataContext = null;
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Ensure target's SelectedItems is now clear.
Assert.Empty(target.SelectedItems);
}
public void Unbound_SelectedItems_Should_Be_Cleared_When_DataContext_Cleared()
{
var data = new
{
Items = new[] { "foo", "bar", "baz" },
};
var target = new TestSelector
{
DataContext = data,
Template = Template(),
};
var itemsBinding = new Binding {
Path = "Items"
};
target.Bind(TestSelector.ItemsProperty, itemsBinding);
Assert.Same(data.Items, target.Items);
target.SelectedItems.Add("bar");
target.DataContext = null;
Assert.Empty(target.SelectedItems);
}
public void Unbound_SelectedItems_Should_Be_Cleared_When_DataContext_Cleared()
{
var data = new
{
Items = new[] { "foo", "bar", "baz" },
};
var target = new TestSelector
{
DataContext = data,
Template = Template(),
};
var itemsBinding = new Binding { Path = "Items" };
target.Bind(TestSelector.ItemsProperty, itemsBinding);
Assert.Same(data.Items, target.Items);
target.SelectedItems.Add("bar");
target.DataContext = null;
Assert.Empty(target.SelectedItems);
}
public void Should_Not_Write_To_Old_DataContext()
{
var vm = new OldDataContextViewModel();
var target = new TestSelector();
var itemsBinding = new Binding
{
Path = "Items",
Mode = BindingMode.OneWay,
};
var selectedItemsBinding = new Binding
{
Path = "SelectedItems",
Mode = BindingMode.OneWay,
};
// Bind Items and SelectedItems to the VM.
target.Bind(TestSelector.ItemsProperty, itemsBinding);
target.Bind(TestSelector.SelectedItemsProperty, selectedItemsBinding);
// Set DataContext and SelectedIndex
target.DataContext = vm;
target.SelectedIndex = 1;
// Make sure SelectedItems are written back to VM.
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Clear DataContext and ensure that SelectedItems is still set in the VM.
target.DataContext = null;
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Ensure target's SelectedItems is now clear.
Assert.Empty(target.SelectedItems);
}
