Artikel
11/17/2011

Settings Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Reports details about the Silverlight-based application's instantiation settings, and exposes some of the HTML DOM values for the hosted Silverlight plug-in instance.

Inheritance Hierarchy

System.Object
System.Windows.Interop.Settings

Namespace: System.Windows.Interop
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class Settings

public sealed class Settings

The Settings type exposes the following members.

Constructors

	Name	Description
	Settings	Infrastructure. Initializes a new instance of the Settings object.

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Properties

	Name	Description
	DefaultDesignImage	Gets or sets a stream associated with a PNG image to be displayed by the host when the Silverlight application is not executing.
	EnableAutoZoom	Gets or sets a value that indicates whether the Silverlight plug-in will resize its content based on the current browser zoom setting.
	EnableCacheVisualization	Gets or sets a value that indicates whether to use a non-production analysis visualization mode, which shows areas of a page that are not being GPU accelerated with a colored overlay. Do not use in production code.
	EnableFrameRateCounter	Gets or sets a value that indicates whether to display the current frame rate in the hosting browser's status bar. (Microsoft Internet Explorer only.)
	EnableGPUAcceleration	Gets a value that indicates whether to use graphics processor unit (GPU) hardware acceleration for cached compositions, which potentially results in graphics optimization.
	EnableHTMLAccess	Gets a value that indicates whether the Silverlight plug-in allows hosted content or its runtime to access the HTML DOM.
	EnableRedrawRegions	Gets or sets a value that indicates whether to show the areas of the Silverlight plug-in that are being redrawn each frame.
	MaxFrameRate	Gets or sets the maximum number of frames to render per second.
	Windowless	Gets a value that indicates whether the Silverlight plug-in displays as a windowless plug-in. (Applies to Windows versions of Silverlight only.)

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Methods

	Name	Description
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The Settings class contains APIs that specifically relate to aspects of the HTML DOM outside of the Silverlight content area (the area declared by the width and height in the initialization).

This object is always the value of the SilverlightHost.Settings property of a parent SilverlightHost, and this is the only context in which a Settings object is used.

Examples

The following code example demonstrates how to use this class.

' The Host object, which represents the host Silverlight plug-in. 
Dim host As System.Windows.Interop.SilverlightHost = _
    Application.Current.Host

' The following code demonstrates how to use the Host object 
' to access other APIs in the System.Windows.Interop namespace. 

' The IsVersionSupported method. This method is useful when 
' you want to implement an upgrade experience in managed code. 
Dim isSupported As Boolean = host.IsVersionSupported("2.0.30908.0")

' Read-only properties of the Host object. 
Dim pluginBackground As System.Windows.Media.Color = host.Background
Dim loaded As Boolean = host.IsLoaded
Dim source As Uri = host.Source

' The Settings object, which represents Web browser settings. 
Dim settings As System.Windows.Interop.Settings = host.Settings

' Read/write properties of the Settings object. 
settings.EnableFrameRateCounter = True
settings.EnableRedrawRegions = True
settings.MaxFrameRate = 60

' Read-only properties of the Settings object. 
Dim windowless As Boolean = settings.Windowless
Dim htmlAccessEnabled As Boolean = settings.EnableHTMLAccess

' The Content object, which represents the plug-in display area. 
Dim content As System.Windows.Interop.Content = host.Content

' The read/write IsFullScreen property of the Content object. 
' See also the Content.FullScreenChanged event. 
Dim isFullScreen As Boolean = content.IsFullScreen

' Read-only properties of the Content object. These properties do 
' not contain meaningful values until after the Content.Resized 
' event occurs for the first time. 
Dim actualWidth As Double = content.ActualWidth
Dim actualHeight As Double = content.ActualHeight

// The Host object, which represents the host Silverlight plug-in.
System.Windows.Interop.SilverlightHost host = 
    Application.Current.Host;

// The following code demonstrates how to use the Host object
// to access other APIs in the System.Windows.Interop namespace.

// The IsVersionSupported method. This method is useful when
// you want to implement an upgrade experience in managed code.
bool isSupported = host.IsVersionSupported("2.0.30908.0");

// Read-only properties of the Host object.
System.Windows.Media.Color pluginBackground = host.Background;
bool loaded = host.IsLoaded;
Uri source = host.Source;

// The Settings object, which represents Web browser settings.
System.Windows.Interop.Settings settings = host.Settings;

// Read/write properties of the Settings object.
settings.EnableFrameRateCounter = true;
settings.EnableRedrawRegions = true;
settings.MaxFrameRate = 60;

// Read-only properties of the Settings object.
bool windowless = settings.Windowless;
bool htmlAccessEnabled = settings.EnableHTMLAccess;

// The Content object, which represents the plug-in display area.
System.Windows.Interop.Content content = host.Content;

// The read/write IsFullScreen property of the Content object.
// See also the Content.FullScreenChanged event.
bool isFullScreen = content.IsFullScreen;

// Read-only properties of the Content object. These properties do 
// not contain meaningful values until after the Content.Resized 
// event occurs for the first time. 
double actualWidth = content.ActualWidth;
double actualHeight = content.ActualHeight;

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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