如何在代码中设置绑定？ [英] How to set a binding in Code?

问题描述

我需要在代码中设置绑定。

我似乎没法找到它。

这是我试过的：

XAML：

 < TextBox Name =txtText>< / TextBox> 
  

代码背后：

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

ViewModel：

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

当我设置它时，该属性不会更新。

我做错了什么？

解决方案

尝试这样： / p>

 绑定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）; 
  

如果您指定路径（像你一样在构造函数中），您的源应该只是 ViewModel ， .SomeString 部分是从路径中计算的。 >

I have the need to set a binding in code.

I can't seem to get it right tho.

This is what i have tried:

XAML:

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

Code behind:

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

ViewModel:

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

The property is not updating when i set it.

What am i doing wrong?

解决方案

Try this:

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);

If you specify path (like you do in constructor), your source should be just ViewModel, the .SomeString part is evaluated from the path.

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