ThumbnailAttribute Class
Associates an icon with a custom Windows Presentation Foundation (WPF) or Silverlight control in the toolbox for Visual Studio or Expression Blend.
Assembly: Microsoft.Windows.Design.Interaction (in Microsoft.Windows.Design.Interaction.dll)
The ThumbnailAttribute type exposes the following members.
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ResourceAssembly | Gets the assembly that contains the icon image. |
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ResourceName | Gets name of the icon image. |
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TypeId | When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.) |
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Equals | Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.) |
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Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
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GetHashCode | Returns the hash code for this instance. (Inherited from Attribute.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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IsDefaultAttribute | When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.) |
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Match | When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
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_Attribute.GetIDsOfNames | Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.) |
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_Attribute.GetTypeInfo | Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.) |
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_Attribute.GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.) |
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_Attribute.Invoke | Provides access to properties and methods exposed by an object. (Inherited from Attribute.) |
Apply the ThumbnailAttribute to assign a toolbox icon to a custom WPF or Silverlight control.
The following steps show how to add an icon representing your control to a type.
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Create a design-time metadata assembly for your custom control. For more information, see Walkthrough: Providing Custom Design-time Metadata.
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Add an image at the same folder hierarchy as the type you pass to the ThumbnailAttribute. Supported extensions and file types are BMP, GIF, JPG, JPEG and PNG.
Different designer hosts use different image sizes for the toolbox icon. You can specify a different image for the WPF Designer and Expression Blend by specifying the ThumbnailAttribute in the host-specific metadata assemblies, *.VisualStudio.Design.dll and *.Expression.Design.dll.
Expression Blend uses 24x24 for the large icon size and 12x12 for the small icon size. The WPF Designer uses 16x16. For more information, see Toolbox Icons.
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In the Properties window, set the build action for the image to EmbeddedResource.
Note
The project sub-folders affect the namespace in which embedded resources are found.
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Implement the IProvideAttributeTable interface to add the ThumbnailAttribute to your control’s class. You can reuse the same image across multiple types by applying the same ThumbnailAttribute to multiple controls.
The ThumbnailAttribute is also used to find a default icon for types added to the Collection Editor or Sub-Properties Editor "new instance" functionality.
