Discovering Browser Capabilities ASP.NET and Web Forms: Developing Browser-Based Applications
6.7 Discovering Browser Capabilities
One of ASP.NETs strengths is that it accommodates differences in client browsers without requiring any special effort from the application developer. However, it is often desirable for a web application to discover the capabilities of the browser making a given request. For this purpose, ASP.NET makes browser information available to the web application. ASP.NETs Request object available through the Page objects Request property has a Browser property that returns an object of type HttpBrowserCapabilities. The properties of this object are: ActiveXControls Indicates whether the client browser supports ActiveX controls. The type is Boolean. AOL Indicates whether the client browser is an America Online browser. The type is Boolean. BackgroundSounds Indicates whether the client browser supports background sounds. The type is Boolean. Beta 297 Indicates whether the client browser is a beta release. The type is Boolean. Browser Indicates the browser string e.g., IE received in the User-Agent header of the HTTP request. The type is String. CDF Indicates whether the browser supports Channel Definition Format for webcasting. The type is Boolean. ClrVersion Indicates the version of the .NET CLR installed on the client if any. The type is Version defined in the System namespace. Cookies Indicates whether the client browser supports cookies. The type is Boolean. Crawler Indicates whether the client browser is a web crawler an automated program used by online search engines to discover web content. The type is Boolean. EcmaScriptVersion Indicates the version of ECMA Script that the client browser supports. The type is Version defined in the System namespace. Frames Indicates whether the client browser supports Frames. The type is Boolean. JavaApplets Indicates whether the client browser supports Java applets. The type is Boolean. JavaScript Indicates whether the client browser supports JavaScript. The type is Boolean. MajorVersion Indicates the major version number of the client browser. The type is Integer. MinorVersion Indicates the minor version number of the client browser. The type is Double. For example, if the version of the client browser is 8.15, the value of the MinorVersion property is 0.15 . MSDomVersion 298 Indicates the version of the Microsoft XML document object model that the client browser supports. The type is Version defined in the System namespace. Platform Indicates the platform on which the client browser is running. The type is String. For example, for a browser running on Windows 2000 Professional, the Platform property returns WinNT . Tables Indicates whether the client browser supports HTML tables. The type is Boolean. Type Indicates the name and major version number of the client browser e.g., IE6 . The type is String. VBScript Indicates whether the client browser supports VBScript. The type is Boolean. Version Indicates the full version number of the client browser e.g., 8.15 . The type is String. W3CDomVersion Indicates the version of the W3C XML document object model that the client browser supports. The type is Version defined in the System namespace. Win16 Indicates whether the client browser is running on a 16-bit Windows operating system. The type is Boolean. Win32 Indicates whether the client browser is running on a 32-bit Windows operating system. The type is Boolean.6.8 Maintaining State
Parts
» VB.NET - (O'Reilly) Programming Visual Basic NET
» What Is the Microsoft .NET Framework?
» hello, world An Example Visual Basic .NET Program
» Hello, Windows An Example Visual Basic .NET Program
» Hello, Browser An Example Visual Basic .NET Program
» Source Files Identifiers The Visual Basic .NET Language
» Numeric Literals String Literals Character Literals
» Date Literals Boolean Literals Nothing Summary of Literal Formats
» Custom Types Collections Types
» The Namespace Statement The Imports Statement
» Symbolic Constants Scope The Visual Basic .NET Language
» Access Modifiers Assignment The Visual Basic .NET Language
» Unary Operators Arithmetic Operators
» Relational Operators Operators and Expressions
» String-Concatenation Operators Bitwise Operators
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» Object Instantiation and New Constructors
» Handling Events Inheritance Classes
» Passing arrays as parameters
» Variable-length parameter lists Main method
» Implementing interface methods Overriding inherited methods
» Overloading Overloading inherited methods
» The MyBase Keyword Nested Classes Destructors
» Interfaces The Visual Basic .NET Language
» Enumerations The Visual Basic .NET Language
» Exceptions The Visual Basic .NET Language
» Delegates The Visual Basic .NET Language
» Using Events and Delegates Together
» Creating Custom Attributes Attributes
» Standard Modules Conditional Compilation
» Summary The Visual Basic .NET Language
» Common Language Infrastructure CLI and Common Language Runtime CLR
» Global Assembly Cache GAC Comparison of Assemblies, Modules, and Namespaces
» Application Domains Common Language Specification CLS
» Intermediate Language IL and Just-In-Time JIT Compilation Metadata
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» Dispose Memory Management and Garbage Collection
» A Brief Tour of the .NET Framework Namespaces
» Configuration File Format Configuration
» Configuration Section Groups The appSettings Section
» Adding event handlers Creating a Form in Code
» Handling Form Events Windows Forms I: Developing Desktop Applications
» Relationships Between Forms Windows Forms I: Developing Desktop Applications
» Merging Menus MDI Applications
» Detecting MDI Child Window Activation
» Component Attributes Windows Forms I: Developing Desktop Applications
» The Graphics Class 2-D Graphics Programming with GDI+
» The Pen Class 2-D Graphics Programming with GDI+
» The Brush Class 2-D Graphics Programming with GDI+
» System colors The Color Structure
» Alpha Blending 2-D Graphics Programming with GDI+
» Antialiasing 2-D Graphics Programming with GDI+
» The PrintPageEventArgs Class Printing
» The OnBeginPrint and OnEndPrint Methods Choosing a Printer
» The PageSettings Class Printing
» The PrinterSettings Class Printing
» Page Setup Dialog Box Print Preview
» Summary Windows Forms I: Developing Desktop Applications
» The Button Class The CheckBox Class The ComboBox Class
» The DateTimePicker Class The GroupBox Class The ImageList Class
» The Label Class The LinkLabel Class
» The ListBox Class Common Controls and Components
» The ListBox.ObjectCollection Class
» The ListView Class Common Controls and Components
» The MonthCalendar Class Common Controls and Components
» The Panel Class The PictureBox Class
» The RadioButton Class Common Controls and Components
» The TextBox Class The Timer Class
» Other Controls and Components
» Control Events Windows Forms II: Controls, Common Dialog Boxes, and Menus
» The Anchor Property Form and Control Layout
» Controlling dock order The Dock Property
» The Splitter control The Dock Property
» ColorDialog FontDialog OpenFileDialog Common Dialog Boxes
» PageSetupDialog PrintDialog PrintPreviewDialog SaveFileDialog
» Adding Menus in the Visual Studio .NET Windows Forms Designer
» Programmatically Creating Menus Menus
» Building Controls from Other Controls
» Building Controls That Draw Themselves Building Nonrectangular Controls
» Summary Windows Forms II: Controls, Common Dialog Boxes, and Menus
» Setting control properties using attributes Adding event handlers
» AutoEventWireup Handling Page Events
» The Button control Web Controls
» The CheckBox control The DropDownList control
» The Image control The Label control
» The ListBox control Web Controls
» The RadioButton control Web Controls
» The Table control Web Controls
» The TextBox control Web Controls
» Other web controls Web Controls
» HTML Controls Handling Control Events
» Programmatically Instantiating Controls More About Server Controls
» More About Validation-Control Tag Attributes
» Using Validation-Control Properties Providing a Summary View of Validation Failures
» Performing Custom Validation Adding Validation
» Using Directives to Modify Web Page Compilation
» The Server Object ASP.NET Objects: Interacting with the Framework
» The Application Object The Session Object The Cache Object The Request Object
» The Response Object ASP.NET Objects: Interacting with the Framework
» Discovering Browser Capabilities ASP.NET and Web Forms: Developing Browser-Based Applications
» The Session Object Maintaining State
» The Application Object Maintaining State
» Session and Application Startup and Shutdown global.asax Compiles to a Class
» Adding Global Objects Application-Level Code and global.asax
» ASP.NET authorization Authorization
» Windows NTFS authorization Code-access authorization
» IUSR_ComputerName Impersonation Accessing Network Resources
» User Controls Designing Custom Controls
» Creating a custom server control using Visual Studio .NET
» Creating a custom server control in code Using a custom server control in Visual Studio .NET
» Summary ASP.NET and Web Forms: Developing Browser-Based Applications
» The WebService Attribute The WebMethod Attribute
» Testing a Web Service with a Browser
» Consuming a Web Service in Visual Studio .NET
» Consuming a Web Service in Notepad
» Synchronous Versus Asynchronous Calls
» Web-Service Descriptions Web-Service Discovery
» Limitations of Web Services Summary
» A Brief History of Universal Data Access Managed Providers
» Connecting to a SQL Server Database
» Connecting to an OLE DB Data Source
» The DataSet Class Finding Tables
» Finding Column Values Finding Column Definitions Changing, Adding, and Deleting Rows
» Writing Updates Back to the Data Source
» Relations Between DataTables in a DataSet
» The DataSets XML Capabilities
» Binding a DataSet to a Windows Forms DataGrid
» Binding a DataSet to a Web Forms DataGrid
» Typed DataSets ADO.NET: Developing Database Applications
» Reading Data Using a DataReader
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