C# WPF代码隐藏数据绑定不工作

为什么数据绑定背后的代码不起作用，当我在XAML中做同样的事情时，它工作得很好

 Binding frameBinding = new Binding();
 frameBinding.Source = mainWindowViewModel.PageName;
 frameBinding.Converter = this; // of type IValueConverter
 frameBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
 frameBinding.IsAsync = true;
 frame.SetBinding(Frame.ContentProperty, frameBinding);

---

您只设置了绑定的

源

，而没有设置其

路径

。声明应如下所示，使用

mainWindowViewModel

实例作为

Source

：

Binding frameBinding = new Binding();
frameBinding.Path = new PropertyPath("PageName"); // here
frameBinding.Source = mainWindowViewModel; // and here
frameBinding.Converter = this;
frameBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
frameBinding.IsAsync = true;
frame.SetBinding(Frame.ContentProperty, frameBinding);

或更短：

Binding frameBinding = new Binding
{
    Path = new PropertyPath("PageName"),
    Source = mainWindowViewModel,
    Converter = this,
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
    IsAsync = true
};
frame.SetBinding(Frame.ContentProperty, frameBinding);

---

您只设置了绑定的

源

，而没有设置其

路径

。声明应如下所示，使用

mainWindowViewModel

实例作为

Source

：

Binding frameBinding = new Binding();
frameBinding.Path = new PropertyPath("PageName"); // here
frameBinding.Source = mainWindowViewModel; // and here
frameBinding.Converter = this;
frameBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
frameBinding.IsAsync = true;
frame.SetBinding(Frame.ContentProperty, frameBinding);

或更短：

Binding frameBinding = new Binding
{
    Path = new PropertyPath("PageName"),
    Source = mainWindowViewModel,
    Converter = this,
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
    IsAsync = true
};
frame.SetBinding(Frame.ContentProperty, frameBinding);

---

绑定成功。设置PageName属性时，还会调用属性更改通知。但是在那之后它就不会被更新了。绑定成功了。设置PageName属性时，还会调用属性更改通知。但是在那之后它就不会被更新了。这也不起作用：frameBinding.Path=newpropertypath（“.”）；frameBinding.Source=mainWindowViewModel.PageName；这也不起作用：frameBinding.Path=newpropertypath（“.”）；frameBinding.Source=mainWindowViewModel.PageName；