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POMultibinding ConvertBack doesn't pass the correct value to source?
 

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  1. POMultibinding ConvertBack doesn't pass the correct value to source?
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    <p>There is a very strange problem which is confusing me a lot.Just like the code below,I had created a [Button] and multibound its [Canvas.LeftProperty] to [Entity.X] and [Entity.Z].The [Entity] class has implemented the [INotifyPropertyChaned].</p> <p>It works well in Convert() Method, [Entity.X] and [Entity.Z] are correctly passed to the [Canvas.LeftProperty].</p> <p>But the problem is:when I changed the [Button]'s location with Canvas.SetLeft() method,the ConvertBack() methods was fired,but the correct value was not passed to the [Entity],the [value] in [Entity.X]'s set section seemed to be the old one all the time.</p> <p>PS:I found a similar question ,but it was not solved either.. :(</p> <p>Similiar question:<a href="http://social.msdn.microsoft.com/Forums/zh-CN/wpf/thread/88B1134B-1DAA-4A54-94ED-BD724724D1EF" rel="nofollow">http://social.msdn.microsoft.com/Forums/zh-CN/wpf/thread/88B1134B-1DAA-4A54-94ED-BD724724D1EF</a></p> <h2>xaml:</h2> <pre><code>&lt;Canvas&gt; &lt;Button x:Name="btnTest"&gt; &lt;Canvas&gt; </code></pre> <h2>BindingCode:</h2> <pre><code>private void Binding() { var enity=DataContext as Entity; var multiBinding=new MutiBinding(); multiBinding.Mode=BindingMode.TwoWay; multiBinding.Converter=new LocationConverter(); multiBinding.Bindings.Add(new Binding("X")); multiBinding.Bindings.Add(new Binding("Z")); btnTest.SetBinding(Canvas.LeftProperty,multiBinding); } </code></pre> <h2>Converter:</h2> <pre><code>public class LocationConverter: IMultiValueConverter { public object Convert(object[] values, TypetargetType,object parameter, CultureInfo culture) { return (double)values[0]*(double)values[1]; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { return new object[]{ (double)value,Binding.DoNoting};//!!value here is correct } } </code></pre> <h2>Entity:</h2> <pre><code>public class Entity:INotifyPropertyChanged { private double x=0d; private double z=0d; public double X { get{ return x;} set{ x=value;//!!value here is not correctly passed CallPropertyChanged("X");} } public double Z { get{ return z;} set{ z=value;//!!value here is not correctly passed CallPropertyChanged("Z");} } } public event PropertyChangedEventHandler PropertyChanged; private void CallPropertyChanged(String info) { if(PropertyChanged!=null) PropertyChanged(this,new PropertyChangedEventArgs(info)); } } </code></pre> <hr>
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    1. USClaw
    1. USClaw
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    1. COcan I see your whole Property please?
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      1. USdennis schütz
    2. CO@dennis schütz ,Thank u for your time.The code above is updated now.
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      1. USClaw
 

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