共用方式為


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)
Available in Sandboxed Solutions: No

Syntax

'Declaration
<AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
<AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level := AspNetHostingPermissionLevel.Minimal)> _
Public Class AlphaImage _
    Inherits SPControl
'Usage
Dim instance As AlphaImage
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, 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.

See Also

Reference

AlphaImage Members

Microsoft.SharePoint.WebControls Namespace