wpf 绑定到 ViewModel.SubClass.Property（子属性）
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原文地址: http://stackoverflow.com/questions/11619612/
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Binding to ViewModel.SubClass.Property (sub-property)
提问by Sonic Soul
let's say i have a section on my screen where "current record" is edited.. so my view model has a class with all currently edited properties such as:
假设我的屏幕上有一个部分在其中编辑“当前记录”..所以我的视图模型有一个包含所有当前编辑属性的类，例如：
class Record {
public string Notes { get { return "Foo"; } set { _notes = value; Notify("Notes"); }
}
and we add this class to the view model:
我们将这个类添加到视图模型中：
class AdjustsmentViewModel {
public Record CurrentRecord { get { return new Record(); }}
}
How can i bind to Notes property of CurrentRecord in my view? I tried this:
如何在我的视图中绑定到 CurrentRecord 的 Notes 属性？我试过这个：
<TextBox Text="{Binding CurrentRecord.Notes, Mode=TwoWay}" VerticalScrollBarVisibility="Auto" TextWrapping="WrapWithOverflow" AcceptsReturn="True" />
This is not working however. I also tried setting DataContext of surrounding StackPanel:
然而，这不起作用。我还尝试设置周围 StackPanel 的 DataContext：
<StackPanel DataContext="{Binding CurrentRecord}">
After that, i tried in my TextBox {Binding Notes} and {Binding Path=Notes}, but none of these seem to work.
之后，我在我的 TextBox {Binding Notes} 和 {Binding Path=Notes} 中尝试过，但这些似乎都不起作用。
Perhaps above really should work and i am messing something elsewhere?
也许上面真的应该工作，而我在其他地方搞砸了？
Update
更新
This is happening in a user control. This user control has a separate view model, from it's parent window.
这发生在用户控件中。这个用户控件有一个单独的视图模型，来自它的父窗口。
this.DataContext = UnityUtil.Resolve<AdjustmentsViewModel>();
Also i am seeing a binding error: 'Notes' property not found on 'object' ''MainViewModel'
我还看到一个绑定错误：在“对象”“MainViewModel”上找不到“注释”属性
that view model is set on the main window.
该视图模型设置在主窗口上。
to verify that i have the right ViewModel bound, i just added this property directly on the viewmodel:
为了验证我有正确的 ViewModel 绑定，我只是直接在 viewmodel 上添加了这个属性：
public string Notes2 { get { return "Bar"; } }
and corresponding textblock in the view:
以及视图中相应的文本块：
<TextBlock Text="{Binding Path=Notes2}" />
this works as expected.
这按预期工作。
Great Success
巨大的成功
Thanks to Ryan, i was able to find the problem. It was not in the property itself, but the way CurrentRecord was being set. In my setter, i make a call to INotifyPropertyChange handler, but that had the old name of the property in it. So the view was not getting a CurrentRecord notification, so i guess Notes notification was not enough ..
感谢 Ryan，我能够找到问题所在。它不在属性本身中，而是在设置 CurrentRecord 的方式中。在我的 setter 中，我调用了 INotifyPropertyChange 处理程序，但其中包含该属性的旧名称。所以视图没有收到 CurrentRecord 通知，所以我猜 Notes 通知是不够的..
in conclusion, this notation is correct: {Binding Path=CurrentRecord.Notes}
总之，这个符号是正确的：{Binding Path=CurrentRecord.Notes}
采纳答案by cguedel
The above should work, {Binding Path=CurrentRecord.Notes} is right. Can you check that your datacontext is set to your viewmodel?
以上应该有效，{Binding Path=CurrentRecord.Notes} 是正确的。您能检查一下您的数据上下文是否设置为您的视图模型吗？
Also check if your viewmodel implements INotifyPropertyChanged.
还要检查您的视图模型是否实现了 INotifyPropertyChanged。
edit: I just created a sample project to recreate this. No need to implement INotifyPropertyChanged, it just works when the datacontext is set to the VM.
编辑：我刚刚创建了一个示例项目来重新创建它。无需实现 INotifyPropertyChanged，它仅在数据上下文设置为 VM 时起作用。
回答by Thelonias
Make sure that your CurrentRecord property is 1) being set and 2) notifying the UI layer that a change has occurred.
确保您的 CurrentRecord 属性 1) 正在设置和 2) 通知 UI 层发生了更改。
