DeviceSpecificChoice Class

 
Note: This API is now obsolete.

Provides a single choice within a DeviceSpecific/Choice construct. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

Namespace:   System.Web.UI.MobileControls
Assembly:  System.Web.Mobile (in System.Web.Mobile.dll)

System.Object
  System.Web.UI.MobileControls.DeviceSpecificChoice

[PersistNameAttribute("Choice")]
[ObsoleteAttribute("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, 
	Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, 
	Level = AspNetHostingPermissionLevel.Minimal)]
public class DeviceSpecificChoice : IParserAccessor, IAttributeAccessor

NameDescription
System_CAPS_pubmethodDeviceSpecificChoice()

Initializes a new instance of the DeviceSpecificChoice class. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

NameDescription
System_CAPS_pubpropertyArgument

Gets or sets the argument used for a Filter property. The default value is null. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubpropertyContents

Gets the overridden properties defined for a choice in a DeviceSpecific/Choice construct. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubpropertyFilter

Gets or sets the name of a device filter. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubpropertyHasTemplates

Gets a value indicating whether the currently selected choice in the <DeviceSpecific> element has templates defined within it. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubpropertyTemplates

Gets the templates that have been defined in the <Choice> element. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubpropertyXmlns

Gets or sets the type of markup in a <Choice> element. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

NameDescription
System_CAPS_protmethodAddParsedSubObject(Object)

Adds the Object to the DeviceSpecificChoice object's Templates object. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_protmethodGetAttribute(String)

Returns the specified attribute from the DeviceSpecificChoice object. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethodSetAttribute(String, String)

Assigns the given value to the attribute specified by the key. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

NameDescription
System_CAPS_pubinterfaceSystem_CAPS_privmethodIAttributeAccessor.GetAttribute(String)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IAttributeAccessor.GetAttribute. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIAttributeAccessor.SetAttribute(String, String)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IAttributeAccessor.SetAttribute. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

System_CAPS_pubinterfaceSystem_CAPS_privmethodIParserAccessor.AddParsedSubObject(Object)

This API supports the product infrastructure and is not intended to be used directly from your code. For a description of this member, see IParserAccessor.AddParsedSubObject. This API is obsolete. For information about how to develop ASP.NET mobile applications, see the www.asp.net/mobile Web site.

This class is analogous to the <Choice> element. Choices are tested in the order that they appear within a <DeviceSpecific> element. If you specify the Filter property of the <Choice> element, its value must be the name of a device filter defined in the <deviceFilters> section of the Machine.config file. At run time, ASP.NET evaluates the specified device filter against the capabilities of the current device. If successful, the choice is selected. If you do not specify the Filter property, the defaults for the <Choice> element are selected.

The following code example shows a <Choice> element within an image. The Source attribute overrides the ImageUrl property of the Image control.

Although the example uses functions to determine whether the browser requires WML (isWML11) or supports color (supportsColor), you can instead use a Web.config file to define a <DeviceSpecific> element that the .NET Framework automatically uses to make the determination for you.

System_CAPS_noteNote

The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information, see ASP.NET Web Forms Page Syntax Overview.

<%@ Page Language="C#" 
    Inherits="System.Web.UI.MobileControls.MobilePage" %>
<%@ Register TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" %>
<%@ Import Namespace="System.Web.Mobile" %>

<script runat="server">
    private bool supportsColor(MobileCapabilities caps, string optValue)
    {
        // Determine if the browser is not a Web crawler and
        // can display in color
        if (!caps.Crawler && caps.IsColor)
            return true;
        return false;
    }

    private bool isWML11(MobileCapabilities caps, string optValue)
    {
        // Determine if the browser is not a Web crawler and
        // requires WML markup
        if (!caps.Crawler && caps.PreferredRenderingType ==
            MobileCapabilities.PreferredRenderingTypeWml11)
            return true;
        return false;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
    <mobile:form id="form1" runat="server">
        <mobile:Image ID="Image1" runat="server" 
            AlternateText="Cannot display this image.">
            <DeviceSpecific>
                <choice Filter ="isWML11" ImageURL="wmlImage.wbmp" />
                <choice Filter="supportsColor" ImageURL="colorImage.gif" />
                <choice ImageURL="monoImg.gif" />
            </DeviceSpecific>
        </mobile:Image>
    </mobile:form>
</body>
</html>

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For operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.

AspNetHostingPermission

For operating in a hosted environment. Demand value: InheritanceDemand; Permission value: Minimal.

.NET Framework
Available since 1.1

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

System.Web.UI.MobileControls Namespace
Introduction to the DeviceSpecific Control
<Choice> Element
<DeviceSpecific>

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