DataBinding背后的WPF代码不起作用

本文关键字：代码不起作用 WPF 背后 DataBinding | 更新日期: 2023-09-27 18:26:24

为什么DataBinding后面的代码不工作，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Source，但没有设置其Path。声明应该是这样的，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);