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MetadataStore Class

MetadataStore Class

.NET Framework 4.6 and 4.5

An in-memory collection of hash tables that allows the rapid lookup of designer elements by Type.


Namespace:  System.Activities.Presentation.Metadata
Assembly:  System.Activities.Presentation (in System.Activities.Presentation.dll)

Public NotInheritable Class MetadataStore

The MetadataStore type exposes the following members.

Public methodStatic memberAddAttributeTableAdds the given table to the current AppDomain object’s attribute store.

The metadata store contains custom attribute metadata, such as the association between designers and types. Custom attributes can be defined in an AttributeTable and added to the metadata store. After the attributes are added, they will appear in calls made to TypeDescriptor.

The following code example shows how to associate the AcitivityDesigner1 custom activity designer with a custom activity. For more information about how to create custom activity designers, see Creating a Custom Activity Designer.

internal class Metadata : IRegisterMetadata
    private AttributeTable attributes;

    // Called by the designer to register any design-time metadata.
    public void Register()
        AttributeTableBuilder builder = new AttributeTableBuilder();

        // Add the custom attributes to associate the ActivityDesigner1 custom designer
        // with the custom activity MyActivity.
            new DesignerAttribute(typeof(ActivityDesigner1)));


.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

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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