如何在Code中设置绑定？

Question

我需要在代码中设置绑定.

我似乎无法做到这一点.

这是我尝试过的:

XAML:

<TextBox Name="txtText"></TextBox>

代码背后:

Binding myBinding = new Binding("SomeString");
myBinding.Source = ViewModel.SomeString;
myBinding.Mode = BindingMode.TwoWay;
myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(txtText, TextBox.TextProperty, myBinding);

视图模型:

public string SomeString
    {
      get
      { 
          return someString;
      }
      set 
      { 
          someString= value;
          OnPropertyChanged("SomeString");
      }
    }

我设置它时,属性不会更新.

我究竟做错了什么？

Answer 1

试试这个:

Binding myBinding = new Binding();
myBinding.Source = ViewModel;
myBinding.Path = new PropertyPath("SomeString");
myBinding.Mode = BindingMode.TwoWay;
myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(txtText, TextBox.TextProperty, myBinding);

如果你指定path(就像在构造函数中那样),你的源应该只是ViewModel,那么.SomeString从路径开始评估该部分.

Answer 2

您需要将源更改为viewmodel对象:

myBinding.Source = viewModelObject;