[英]How to bind a property to the property of another class (with no UI Control)?
我花了幾個小時研究我的簡單任務。 我正在嘗試將我的變量TestString綁定到TestClass.MeinString 。
如果我單擊“ tb_tbBinding ”按鈕,TestString和TestClass.MyString應該保持相同的值。
相關代碼:
public partial class Window_Test : Window, INotifyPropertyChanged
{
public Window_Test()
{
InitializeComponent();
DataContext = this;
// Trying to bind TestClass.MeinString to TestString
BindingOperations.SetBinding(TestClass, BindingTestClass.MeinStringProperty, new Binding("TestClass.MeinString") { UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged });
}
string _TestString = "Hello World!";
public string TestString
{
get
{
return _TestString;
}
set
{
_TestString = value;
OnPropertyChanged("TestString");
}
}
BindingTestClass _TestClass = new BindingTestClass("Hallo Lukas!");
public BindingTestClass TestClass
{
get
{
return _TestClass;
}
set
{
_TestClass = value;
OnPropertyChanged("TestClass");
}
}
private void btn_testclasschanger_click(object sender, RoutedEventArgs e)
{
TestClass.MeinString = "Changed String!";
}
private void btn_teststringchanger_click(object sender, RoutedEventArgs e)
{
TestString = "Changed Class!";
}
}
我的自定義類:
public class BindingTestClass : DependencyObject, INotifyPropertyChanged
{
public BindingTestClass(string myString)
{
MeinString = myString;
}
public string MeinString
{
get
{
return (string)GetValue(MeinStringProperty);
}
set
{
SetValue(MeinStringProperty, value);
OnPropertyChanged("MeinString");
}
}
public static readonly DependencyProperty MeinStringProperty = DependencyProperty.Register("MeinString", typeof(string), typeof(BindingTestClass), new FrameworkPropertyMetadata()
{
BindsTwoWayByDefault = true,
DefaultUpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
});
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
}
感謝大伙們!
嘗試設置綁定的Source
屬性
BindingOperations.SetBinding(TestClass, BindingTestClass.MeinStringProperty,
new Binding("TestString") { Source=this, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged });
默認情況下,綁定使用.DataContext
作為綁定的源,但在您的情況下, TestClass
沒有將.DataContext
設置為任何內容。 實際上,我甚至不確定它是否是DependencyObject
上的有效屬性。
通常, .DataContext
是從WPF可視化樹中的對象父級繼承的,但由於TestClass
不是可視樹的一部分,因此沒有任何內容可以繼承。
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