NET Framework 20 Data Binding Enhancements in Visual Studio .NET

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NET Framework 10 introduced a number of data-binding mechanisms that still are valid in NET 20 The Control base class (from which every Windows Forms control derives) implements IBindableComponent, which exposes a collection of data bindings that let you tie properties of that control to data source properties, as described earlier when I defined simple data binding Additionally, some Windows Forms controls that support complex binding allow you to set other properties that determine what portion of the list is presented For example, on a ComboBox control you can set a DisplayMember property to tell the control what property on the data items in the DataSource list it should use for displaying each item You can also specify a ValueMember property that tells the control which property on the data items to track along with the display member This latter value is often used to hold the primary key or object reference to the data item so that it can be used for subsequent queries or updates Listing 31 demonstrates setting up data binding for a ComboBox
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Listing 31 ComboBox Data Binding
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public partial class MyForm : Form { ComboBox m_Combo = new ComboBox(); public void OnFormLoad(object sender, EventArgs args) { CustomersDataSet dataSource = new CustomersDataSet(); CustomersTableAdapter adapter = new CustomersTableAdapter(); adapterFill(dataSource); m_ComboDataSource = dataSourceCustomers; m_ComboDisplayMember = "CompanyName"; m_ComboValueMember = "CustomerID"; } }
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Listing 31 sets the DataSource property on a ComboBox control to the Customers table within a typed data set, which implements the IList interface and is the complex binding data source TheDisplayMember property takes the name of the property (or column in the case of a data table) whose value will be extracted for each item in the list and displayed in the ComboBox as text The ValueMember identifies an additional field that keeps the value for each item displayed in the ComboBox In this case, the code points theValueMember property to the CustomerID column, so this primary key value can be used to select the appropriate row from the database or data set when the user has selected an item in the ComboBox Another capability available since NET 10 is that container controls include something called a BindingContext This keeps track of all the data sources within the container that are bound to the container's controls, and ensures that changes within the individual controls and the data source are synchronized correctly Unfortunately, NET 1X had a lot of unnecessary complexity in how these mechanisms got surfaced to the programmer, and that made Windows Forms data binding a fairly painful process While NET 1X made it very easy to do some simple thingsmuch more so than with UI technologies that preceded NETwhen you started trying to code slightly more complicated and real-world data-presentation scenarios, it was often difficult to get things to work consistently and correctly This has been a major focus area for improvement in NET 20, and things have gotten a lot better, both for the programmer and for the end user Some of the data-binding improvements in NET 20 include
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More of the complexity has been hidden from you unless you really need it There are more options and flexibility The code that you do need to write is more intuitive You get more consistent results
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The designer does most of the grunt work for you, letting you use gestures and interactions with design-time UI to generate all the appropriate data-binding code for you However, before you start to rely on the designer without understanding what it is doing for you, I will cover how things work at the code level
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