Question

我正在开发一个模块化应用程序，该应用程序将包含可能有或没有参数的过程。参数被加载到每个过程，并且执行目标是要求用户输入所有必需的参数，然后它做一些额外的工作。

我已设法加载所有内容并且一切正常，但我不知道如何为每个参数值进行动态绑定。

我已经制作了一个演示应用程序来测试它，即使我已经摆弄了一下，我仍然无法让它工作，我不会知道缺少什么。

这里是演示应用程序的代码，它是实际应用程序的简化版本，但概念几乎完全相同：

public class TestBinding 
{
    public List<Val> Values {get;set;}

    public TestBinding()
    {
        Values = new List<Val>();
        Values.Add(new Val {Caption = "First", Value = String.Empty});
        Values.Add(new Val {Caption = "Second", Value = String.Empty});
        Values.Add(new Val {Caption = "Third", Value = String.Empty});
    }
}

public class Val 
{
    public string Caption {get;set;}
    public string Value {get;set;}
}

public TestBinding TB {get;set;}
public Window1()
{
    InitializeComponent();

    TB = new TestBinding();

    foreach(var x in TB.Values)
    {
        var txt = new TextBox() {Height = 25, Width = 150};

        var myBinding = new Binding("x.Value"); //???? Not sure about this
        myBinding.Source = x.Value;
        myBinding.Mode = BindingMode.TwoWay;
        myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
        BindingOperations.SetBinding(txt, TextBox.TextProperty, myBinding);

        SPanel.Children.Add(txt);
    }

    var btn = new Button() {Height = 20, Width = 150, Content = "Show values"};

    btn.Click += new RoutedEventHandler(radioButton1_Click);
    SPanel.Children.Add(btn);
}

private void radioButton1_Click(object sender, RoutedEventArgs e)
{
    foreach(var x in TB.Values)
    {
        MessageBox.Show(x.Value);
    }
}

Answer 1

您已将Binding的Source对象和Path与该对象的source属性混淆。

它应该是这样的：

var myBinding = new Binding("Value");
myBinding.Source = x;
myBinding.Mode = BindingMode.TwoWay;
myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;

或

var myBinding = new Binding
{
    Path = new PropertyPath("Value"),
    Source = x,
    Mode = BindingMode.TwoWay,
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
};

txt.SetBinding(TextBox.TextProperty, myBinding);

动态双向绑定到wpf

1 个答案: