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PODynamically bind a DataRepeater (Microsoft.VisualBasic.PowerPacks)
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copied!<p>I am using a DataRepeater to show data from a business objects on the screen. I am using windows forms in C# to accomplish this. The datasource is not available at compile time so I want to bind the datasource at runtime.</p> <p>Here is the simplified scenario. I'm using this business class:</p> <pre><code>public class Product { private double _price; public double Price { get { return _price; } set { _price = value; } } } </code></pre> <p>I have created a ProductDataSource with the VisualStudio interface and bound the price to a label. Now I filled the datasource of my repeater in code:</p> <pre><code>dataRepeater1.DataSource = _productDataAgent.GetProducts(); </code></pre> <p>When I startup my application the prices are correctly filled in the labels. So far so good. </p> <p>Now I want the price labels to be updated when the product is updated. The Visual Studio interface helps me, and let me choose a 'Data Source Update Mode'. So I choose "OnPropertyChanged". </p> <p>Here comes the tricky part. How does the .NET runtime know that the price property is updated from the backend. So I modify my business class to implement INotifyPropertyChanged. Like this:</p> <pre><code>public class Product : INotifyPropertyChanged { private double _price; public double Price { get { return _price; } set { _price = value; if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("Price")); } } } public event PropertyChangedEventHandler PropertyChanged; } </code></pre> <p>The problem is this doesn't work. When I update a product it remeanes un-updated in the interface. When I debug and change the property, I see that the PropertyChanged event is null so no one is listening.</p> <p>Delving a little deeper in to the problem I found the following on the System.Windows.Forms.Binding Constructor page on MSDN:</p> <blockquote> <p>An event named PropertyNameChanged.</p> </blockquote> <p>So I tried using a (custom) PriceChanged event, but that did not work.</p> <p>Am I doing something wrong here? I am comming from using WPF, so maybe this works a little different in Windows Forms? Is this because I am binding at runtime?</p>

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