C# 绑定到对象的属性
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原文地址: http://stackoverflow.com/questions/15610887/
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binding to a property of an object
提问by LastBye
I want to binda series of TextBoxesin a grid into properties of an objectwhich is itself another property in my ViewModel (the DataContext).
我想将网格中的一系列 TextBox绑定到一个对象的属性中，该对象本身就是我的 ViewModel（DataContext）中的另一个属性。
CurrentPersonconsists of Nameand Ageproperties
CurrentPerson由Name和Age属性组成
Inside the ViewModel:
在视图模型内部：
public Person CurrentPerson { get; set ... (with OnPropertyChanged)}
Xaml :
文件：
<TextBox Text="{Binding Name}" >
<TextBox Text="{Binding Age}" >
I wasn't sure on the approach to use, I set another DataContext in the grid scope, without any result, Also tried setting the source and path like Source=CurrentPerson, Path=Age again without any result, these were for trial and see if there would be any change or not.
我不确定使用的方法，我在网格范围内设置了另一个 DataContext，没有任何结果，还尝试设置源和路径，如 Source=CurrentPerson, Path=Age 再次没有任何结果，这些都是为了试用，看看如果有任何变化。
How should I achieve this ?
我应该如何实现这一目标？
采纳答案by Viv
Does your Personclass members Nameand Ageraise INPC themselves?
你的Person班级成员Name和AgeINPC 自己抚养吗？
If you want to update the value of either Nameor Agein the ViewModeland have it reflect in the view, you need them to raise property changed individually inside Personclass as well.
如果您想更新Name或Age中的值ViewModel并使其反映在视图中，您还需要它们在Person类中单独更改属性。
The bindings are fine, but the view is not notified of changes from the view model. Also remember UpdateSourceTriggerfor a TextBoxby default is LostFocus, so setting that to PropertyChangedwill update your string in the ViewModelas you're typing.
绑定很好，但是视图不会收到来自视图模型的更改的通知。还要记住UpdateSourceTrigger，TextBox默认情况下是LostFocus，因此将其设置为PropertyChanged将在ViewModel您键入时更新您的字符串。
Simple example:
简单的例子：
public class Person : INotifyPropertyChanged {
private string _name;
public string Name {
get {
return _name;
}
set {
if (value == _name)
return;
_name = value;
OnPropertyChanged(() => Name);
}
}
// Similarly for Age ...
}
Now your xaml would be:
现在你的 xaml 将是：
<StackPanel DataContext="{Binding CurrentPerson}">
<TextBox Text="{Binding Name}" />
<TextBox Margin="15"
Text="{Binding Age}" />
</StackPanel>
or you can also bind as suggested by @Kshitij:
或者您也可以按照@Kshitij 的建议进行绑定：
<StackPanel>
<TextBox Text="{Binding CurrentPerson.Name}" />
<TextBox Margin="15"
Text="{Binding CurrentPerson.Age}" />
</StackPanel>
and to update view model as you're typing:
并在您键入时更新视图模型：
<StackPanel DataContext="{Binding CurrentPerson}">
<TextBox Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}" />
<TextBox Margin="15"
Text="{Binding Age, UpdateSourceTrigger=PropertyChanged}" />
</StackPanel>
回答by K Mehta
Try this:
尝试这个：
<TextBox Text="{Binding CurrentPerson.Name}" />
<TextBox Text="{Binding CurrentPerson.Age}" />
Essentially, you can drill down into properties by using the .separator.
本质上，您可以使用.分隔符深入了解属性。
For future reference, if you want to drill down into collections, you can use MyCollection[x]just like you would in code (where x would be replaced by a hard-coded number, not a variable).
为了将来参考，如果您想深入到集合中，您可以MyCollection[x]像在代码中一样使用（其中 x 将替换为硬编码数字，而不是变量）。
