static void Bind_TwoWay()
{
// Binding Source (Any object).
var person = new Person1 {
Id = 123, Name = "Taro"
};
// Binding Target (DependencyObject).
var textBox = new TextBox {
Text = "Default"
};
Console.WriteLine(textBox.Text);
// Binds target to source.
var binding = new Binding(nameof(person.Name))
{
Source = person, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
};
textBox.SetBinding(TextBox.TextProperty, binding);
Console.WriteLine(textBox.Text);
// Changes source value.
person.Name = "Jiro";
Console.WriteLine(textBox.Text);
// Changes target value.
textBox.Text = "Saburo";
Console.WriteLine(person.Name);
}
static void Bind_Collection()
{
var taro = new Person1 {
Id = 123, Name = "Taro"
};
var jiro = new Person1 {
Id = 234, Name = "Jiro"
};
// Binding Source (collection).
var people = new ObservableCollection <Person1> {
taro
};
// Binding Target.
var itemsControl = new ItemsControl();
Console.WriteLine(itemsControl.Items.Count);
// Binds target to source.
// MEMO: Binding Source のオブジェクト自体が変更されないのであれば、
// ItemsSource プロパティのデータ バインディングは必須ではありません。
itemsControl.ItemsSource = people;
Console.WriteLine(itemsControl.Items.Count);
// Changes source collection.
people.Add(jiro);
Console.WriteLine(itemsControl.Items.Count);
people.RemoveAt(0);
Console.WriteLine(itemsControl.Items.Count);
// MEMO: ItemsSource に値を設定している場合、Items を直接変更しようとすると例外が発生します。
//itemsControl.Items.Add(jiro);
}
static void Bind_OneWay()
{
// Binding Source (Any object).
var person = new Person1 {
Id = 123, Name = "Taro"
};
// Binding Target (DependencyObject).
var textBlock = new TextBlock {
Text = "Default"
};
Console.WriteLine(textBlock.Text);
// Binds target to source.
var binding = new Binding(nameof(person.Name))
{
Source = person
};
textBlock.SetBinding(TextBlock.TextProperty, binding);
Console.WriteLine(textBlock.Text);
// Changes source value.
person.Name = "Jiro";
Console.WriteLine(textBlock.Text);
}
static void Bind_OneWay()
{
// Binding Source (Any object).
var person = new Person1 { Id = 123, Name = "Taro" };
// Binding Target (DependencyObject).
var textBlock = new TextBlock { Text = "Default" };
Console.WriteLine(textBlock.Text);
// Binds target to source.
var binding = new Binding(nameof(person.Name)) { Source = person };
textBlock.SetBinding(TextBlock.TextProperty, binding);
Console.WriteLine(textBlock.Text);
// Changes source value.
person.Name = "Jiro";
Console.WriteLine(textBlock.Text);
}
static void Bind_TwoWay()
{
// Binding Source (Any object).
var person = new Person1 { Id = 123, Name = "Taro" };
// Binding Target (DependencyObject).
var textBox = new TextBox { Text = "Default" };
Console.WriteLine(textBox.Text);
// Binds target to source.
var binding = new Binding(nameof(person.Name)) { Source = person, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged };
textBox.SetBinding(TextBox.TextProperty, binding);
Console.WriteLine(textBox.Text);
// Changes source value.
person.Name = "Jiro";
Console.WriteLine(textBox.Text);
// Changes target value.
textBox.Text = "Saburo";
Console.WriteLine(person.Name);
}
static void Bind_Collection_CurrentItem()
{
var taro = new Person1 {
Id = 123, Name = "Taro"
};
var jiro = new Person1 {
Id = 234, Name = "Jiro"
};
var people = new[] { taro, jiro };
var grid = new Grid {
DataContext = people
};
var listBox = new ListBox {
IsSynchronizedWithCurrentItem = true
};
grid.Children.Add(listBox);
var textBlock = new TextBlock {
Text = "Default"
};
grid.Children.Add(textBlock);
textBlock.SetBinding(FrameworkElement.DataContextProperty, new Binding("/"));
textBlock.SetBinding(TextBlock.TextProperty, new Binding("Name"));
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
// MEMO: In case that IsSynchronizedWithCurrentItem is false, SelectedValue is null.
listBox.SetBinding(ItemsControl.ItemsSourceProperty, new Binding());
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
listBox.SelectedValue = jiro;
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
}
static void Bind_Collection_CurrentItem()
{
var taro = new Person1 { Id = 123, Name = "Taro" };
var jiro = new Person1 { Id = 234, Name = "Jiro" };
var people = new[] { taro, jiro };
var grid = new Grid { DataContext = people };
var listBox = new ListBox { IsSynchronizedWithCurrentItem = true };
grid.Children.Add(listBox);
var textBlock = new TextBlock { Text = "Default" };
grid.Children.Add(textBlock);
textBlock.SetBinding(FrameworkElement.DataContextProperty, new Binding("/"));
textBlock.SetBinding(TextBlock.TextProperty, new Binding("Name"));
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
// MEMO: In case that IsSynchronizedWithCurrentItem is false, SelectedValue is null.
listBox.SetBinding(ItemsControl.ItemsSourceProperty, new Binding());
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
listBox.SelectedValue = jiro;
Console.WriteLine((listBox.SelectedValue as Person1)?.Name ?? "null");
Console.WriteLine(textBlock.Text);
}
static void Bind_Collection()
{
var taro = new Person1 { Id = 123, Name = "Taro" };
var jiro = new Person1 { Id = 234, Name = "Jiro" };
// Binding Source (collection).
var people = new ObservableCollection<Person1> { taro };
// Binding Target.
var itemsControl = new ItemsControl();
Console.WriteLine(itemsControl.Items.Count);
// Binds target to source.
// MEMO: Binding Source のオブジェクト自体が変更されないのであれば、
// ItemsSource プロパティのデータ バインディングは必須ではありません。
itemsControl.ItemsSource = people;
Console.WriteLine(itemsControl.Items.Count);
// Changes source collection.
people.Add(jiro);
Console.WriteLine(itemsControl.Items.Count);
people.RemoveAt(0);
Console.WriteLine(itemsControl.Items.Count);
// MEMO: ItemsSource に値を設定している場合、Items を直接変更しようとすると例外が発生します。
//itemsControl.Items.Add(jiro);
}
