WPF代碼隱藏DataBinding不工作

Question

爲什麼此代碼隱藏DataBinding無法正常工作，當我在XAML中執行相同的操作時，它工作正常。

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); 

Answer 1

你只設置綁定的Source，而不是它的Path。聲明應該是這樣的，使用mainWindowViewModel實例作爲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);