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Data Binding in .NET 2.0 - Simple Data Binding
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Posted: 16 Mar, 2008
by: Admin A.
Updated: 16 Mar, 2008
by: Admin A.
Posted by Zdenek Ceska on 4/04/06 at 10:00 am
Categories: Programming, Technologies, Languages, C#, .NET
 

.NET supports Data Binding for easy displaying of information. It's much better than manual copying the data into the graphic controls. In addition this supports interactions between the data source and the GUI.

Auxiliary code

Definition of a value object as a book. The price is nullable, because doesn't need to be filled.

  1. public class Book
  2. {
  3.  private string name;
  4.  private decimal? price;
  5.  
  6.  public Book(string name, decimal? price)
  7.  {
  8.  this.name = name;
  9.  this.price = price;
  10.  }
  11.  
  12.  public string Name
  13.  {
  14.  get { return this.name; }
  15.  }
  16.  
  17.  public decimal? Price
  18.  {
  19.  get { return this.price; }
  20.  }
  21. }

Creation of an array of the books for the data source. 

  1. Book[] books = new Book[]
  2. {
  3.  new Book("Programming", 18m),
  4.  new Book("How-to", 8.4m),
  5.  new Book("HTML", null)
  6. };

Binds the data source to the list box

You must set the DataSource property to an object that is the data source of the list box. Generally, the data source can be an array, a collection (ArrayList, List<...> ), including DataSet and a class implemented by the IList, ITypedList or IListSource.

The DisplayMember property specifies the name of the property from the data source. The value of the source property is displayed in the list box.

Also exists the ValueMember property. This property specifies the name of the property with the ID or the primary key of the item. It's used for selection of the items. This example doesn't use the ValueMember property.

  1. this.bookList.DataSource = books;
  2. this.bookList.DisplayMember = "Name";

Binds the data source to the text boxes

This code binds the text boxes to the Name and the Price property of the data source. 

  1. this.txtName.DataBindings.Add("Text", books, "Name");
  2. this.txtPrice.DataBindings.Add("Text", books, "Price");

The parameters correspond with these properties in the following order:

  • PropertyName - the name of the control property
  • DataSource - the data source to bind
  • DataMember - the name of the property from the data source

In addition the DataMember text can navigate in the hierarchy of the properties. For example "Customers.Address.City".

The current item of the data source

The CurrencyManager contains the current item. When you select an item in the list box, the position in the CurrencyManager is automatically changed. An index of the current item is saved in the Position property. The CurrencyManager is inherited from the BindingManagerBase. Also exists the PropertyManager and it's used to maintain the current property of an object.

The following code shows how to get the BindingManagerBase from the Form.

  1. ... = this.BindingContext[books];

Screenshots

Data Binding in .NET 2.0 - Simple Data Binding - Screenshot 1 Data Binding in .NET 2.0 - Simple Data Binding - Screenshot 2
Screenshot 1 Screenshot 2
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