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POCall RaisedPropertyChanged for Parent Class when Child Property Changes
 

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    <h1>Structure of Program</h1> <p>Currently I am using the MVVMLight 4.1 framework in my application.</p> <p>I have a view model <code>XViewModel</code> which wraps around an instance of <code>XClass</code>, <code>X</code>. <code>X</code> contains many properties such as <code>S</code>. I also have another instance of <code>XClass</code> in another ViewModel.</p> <h3>ViewModel</h3> <pre><code>public XViewModelClass XViewModel : ViewModelBase { public XClass X { get { return x; set } if(value == x) { return; } var oldValue = x; x = value; RaisePropertyChanged(XPropertyName, oldValue, x, true) } } private XClass x; public const string XPropertyName = "X" } </code></pre> <h2>ViewModel2</h2> <pre><code>public YViewModelClass YViewModel : ViewModelBase { public YViewModel() { Messenger.Default.Register&lt;PropertyChangedMessage&lt;XClass&gt;&gt;(this, message =&gt; { X2 = message.NewValue }); } public XClass X2 { get { return x2 set } if(value == x2) { return; } var oldValue = x2 x2= value; RaisePropertyChanged(X2PropertyName) } } private string x2; public const string XPropertyName = "X2" } </code></pre> <h2>Model</h2> <pre><code>public class X : ObservableObject { public string S { get { return s; set } if(value == S) { return; } s = value; RaisePropertyChanged(SPropertyName) } } private string s; public const string XPropertyName = "S" } </code></pre> <h1>Problem</h1> <p>How do I ensure that when any property in <code>X</code> changes (e.g. <code>S</code> is set to a different value), <code>RaisePropertyChanged</code> is called for <code>X</code>. It would be best if I don't have to send a property changed message for every property in my model.</p> <p>The reason behind is that I have another instance of <code>XClass</code>, `X2' in another ViewModel and I want to keep both instances in sync.</p>
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    1. USKiang Teng
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