AlphaImage class
Use the AlphaImage Web control to render PNG images in Microsoft Internet Explorer.
Inheritance hierarchy
System.Object
System.Web.UI.Control
Microsoft.SharePoint.WebControls.SPControl
Microsoft.SharePoint.WebControls.AlphaImage
Microsoft.SharePoint.WebControls.ViewIcon
Namespace: Microsoft.SharePoint.WebControls
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Syntax
'Declaration
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class AlphaImage _
Inherits SPControl
'Usage
Dim instance As AlphaImage
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class AlphaImage : SPControl
Remarks
The AlphaImage Web control uses ECMAScript (JScript, JavaScript) to change the filter style for a PNG image. This allows Microsoft Internet Explorer to render transparency for the PNG image.
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.