Data Binding in ASP.NET 2.0

Transcription

1 Data Binding in ASP.NET 2.0 Brian Noyes Principal Software Architect IDesign, Inc. ( About Brian Principal Software Architect, IDesign Inc. ( Microsoft MVP in ASP.NET Writing MSDN Magazine, MSDN Online, CoDe Magazine, The Server Side.NET, asp.netpro, Visual Studio Magazine,.NET Developer s Journal Data Binding in Windows Forms 2.0, Addison-Wesley, expected release Jan 2006 Smart Client Deployment with ClickOnce, Addison-Wesley, expected release Spring 2006 Speaking Microsoft TechEd US, Europe, Malaysia, Visual Studio Connections, DevTeach Montreal, SDC Netherlands, DevEssentials, VSLive!, INETA Speakers Bureau Participate in Microsoft design reviews brian.noyes@idesign.net Blog:

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3 Data Binding Process One-way data binding Pull data out of a data collection and present it Two-way data binding Detect changes made by the user through bound controls Push changes into bound data source Web Form Data Binding The Challenge: HTTP Request/Response Model ASP.NET Page processing model No way to achieve true two way data binding Solution: Simulate two-way data binding through postback reconstruction ASP.NET 2.0 and the Bind method automate this

4 Agenda ASP.NET Data Binding Basics Retrieve data from a data store ADO.NET Data access layer Create data sources in the web tier DataSets Custom collections Individual data objects Use control data binding mechanisms to associate data source Control renders the data

5 Data Binding Expressions <%# %> inline in markup Called when DataBind is called Injected by designer when data binding is set up Can do things in code-behind instead New in 2.0: Bind() Achieves better two-way binding experience Eval() simplifies data binding expressions <%$ %> - configuration script Agenda

6 Data Source Controls New in ASP.NET 2.0 Layer of indirection between bound controls and data sources Similar in concept to BindingSources in Windows Forms 2.0 More flexible and easy to use model for hooking up data binding SqlDataSource ObjectDataSource AccessDataSource XmlDataSource SiteMapDataSource

7 Agenda GridView Overview Replacement for the DataGrid control Similar in function, use, and purpose Much more built-in functionality Sorting, paging, editing, selection Easier to customize Better designer support

8 Agenda DetailsView Formatted view of the details of a data bound object Row from a table flipped on its side Tabular formatting Editing, adding and paging support

9 FormView Control Similar to DetailsView Lower level Template driven More flexible Similar to difference between DataList and Repeater Agenda

10 Master-Details Easy to support through data source controls One data source for master One data source for details Two approaches: Modify WHERE clause on details data source based on master selections Use FilterExpression and FilterParameters to let the data source do the filtering Agenda

11 TreeView control TreeNodeBinding property Specify the nodes within the source for each level to bind to Site Map Specific data source type and schema Provides hierarchical navigation control Resources More Load, Less Code with the Data Enhancements of ASP.NET 2.0, by Dino Espositio, MSDN Magazine, June, Data/default.aspx Simplified and Extended Data Binding Syntax in ASP.NET 2.0, Alex Homer, 15 Seconds: Data Binding in ASP.NET 2.0, Jesse Liberty, O Reilly OnDotNet ASP.NET v2.0 The Beta Version, Homer et al, Addison- Wesley brian.noyes@idesign.net Blog: