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POHow to Databind to a CLR object with Source different to path
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Id
6939111
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6939200
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2
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1
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CreationDate
2011-08-04T09:35:22.330
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0
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2011-08-04T12:36:35.350
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2011-08-04T10:03:21.750
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1
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135
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text
Body
I am trying to update a textblock on the view by databinding to a property in the viewmodel (the datacontext for the view). In the code below; when SelectedItem changes, I want the textblock text to update with the value of the Name property on SelectedItem. In an attempt to achieve this I have set the binding source to the property that is changing and the binding path to the data I want to update the textblock with. I.e. I am expecting that the binding engine will see a change on the binding Source (SelectedItem) and pull the data from the binding Path (SelectedItem.Name). <a href="http://msdn.microsoft.com/en-us/library/ms746695.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms746695.aspx</a> Setting the SelectedItem raises INPC but the text does not update. <pre><code>public class ViewModel { public IConfiguration Configuration { get; set;} } public class Configuration : IConfiguration, INotifyPropertyChanged { public Item SelectedItem { get { return _item;} set { _item = value; ItemName = _item.Name; RaisePropertyChangedEvent("SelectedItem"); } } public string ItemName { get { return _itemName;} set { _itemName= value; RaisePropertyChangedEvent("ItemName"); } } } public class Item { public string Name { get; set;} } </code></pre> I know that changes on Configuration are seen because this works: <pre><code><TextBlock Text="{Binding Configuration.ItemName}"/> </code></pre> But this does not: <pre><code><TextBlock Text="{Binding Path=Name, Source=Configuration.SelectedItem}"/> </code></pre> And nor does this: <pre><code><TextBlock Text="{Binding Path=Configuration.SelectedItem.Name, Source=Configuration.SelectedItem}"/> </code></pre> I'm assuming that this should be straightforward - what have I missed?
Tags
<wpf><data-binding><mvvm>
Title
How to Databind to a CLR object with Source different to path
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1. COFor second and third options to work you must implement INotifyPropertyChanged interface in your Item class as well... if that is not possible then you must raise BindingExpression.UpdateTarget() call each time the Item.Name is updated in your code and this must be done in an attached behavior... due to restrictions of MVVM.
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