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POBinding doesn't work after setting the property value to null
 

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  1. POBinding doesn't work after setting the property value to null
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    <p>I have a DataGrid witch is bound to a ObservableCollection&lt;"Product">. The columns are bound to properties of Product. Most of then are of type double?(nullable).</p> <p>In some time I have to set some property to null. After that, no matter the value I set, the binding don't work. The value is not updated in the view.</p> <p>What happens to the binding when I set a property to null?</p> <p>I tried what is shown in this blog post <a href="http://wildermuth.com/2009/11/18/Data_Binding_Changes_in_Silverlight_4" rel="nofollow">http://wildermuth.com/2009/11/18/Data_Binding_Changes_in_Silverlight_4</a> but it didn't worked to me.</p> <p>Thanks!</p> <p><strong>Edit:</strong> Below is the class I've created that implements the INotifyPropertyChanged</p> <pre><code>public class NotifyPropertyChangedAttribute : INotifyPropertyChanged { Dictionary&lt;string, object&gt; _propBag = new Dictionary&lt;string, object&gt;(); protected object Get(string propName) { object value = null; _propBag.TryGetValue(propName, out value); return value; } protected void Set(string propName, object value) { if (!_propBag.ContainsKey(propName) || Get(propName)!=null) { _propBag[propName] = value; OnPropertyChanged(new PropertyChangedEventArgs(propName)); } } public event PropertyChangedEventHandler PropertyChanged; protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) PropertyChanged(this, e); } } </code></pre> <p>This is my Product class. The DataGrid's ItemsSource property is bound to a ObservableCollection of Products:</p> <pre><code>public class Product : NotifyPropertyChangedAttribute { public string Name { get { return (string)Get("Name") ?? ""; } set { Set("Name", value); } } public double? Price { get {return (double)Get("Price") ?? null;} set { Set("Price", value);} } public void Reset() { var propertyInfo = typeof(Product).GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.Instance); foreach (var p in propertyInfo) { p.SetValue(this , null, null); } } } </code></pre> <p>Look the Reset() method. The binding stop working after I call this method. In my app, I need that when the user press "Del" key, the DataGrid's row get empty, but can not be removed.</p>
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    1. USAndre Nascentes
    1. USAndre Nascentes
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    1. COPlease post your xaml and one of the property of your viewmodel
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      1. POBinding doesn't work after setting the property value to null
      1. USgaurawerma
 

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