DataViewCommandHandler Class

Artikel
02/28/2011

Provides the ability to implement commands, specifically custom commands, for nodes in a data view.

Inheritance Hierarchy

System.Object
Microsoft.VisualStudio.Data.ObjectWithSite
Microsoft.VisualStudio.Data.DataViewCommandHandler

Namespace: Microsoft.VisualStudio.Data
Assembly: Microsoft.VisualStudio.Data (in Microsoft.VisualStudio.Data.dll)

Syntax

'Declaration
Public Class DataViewCommandHandler _
    Inherits ObjectWithSite

public class DataViewCommandHandler : ObjectWithSite

public ref class DataViewCommandHandler : public ObjectWithSite

type DataViewCommandHandler =  
    class
        inherit ObjectWithSite
    end

public class DataViewCommandHandler extends ObjectWithSite

The DataViewCommandHandler type exposes the following members.

Constructors

	Name	Description
	DataViewCommandHandler	Class constructor. Instantiates a new instance of the DataViewCommandHandler class.

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Properties

	Name	Description
	DataViewHierarchyAccessor	Retrieves a DataViewHierarchyAccessor object instance, which provides managed accessors to the IVsHierarchy object that implements the data view hierarchy.
	Site	Retrieves or sets the object site. (Inherited from ObjectWithSite.)

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Methods

	Name	Description
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	ExecuteCommand(Int32, OleCommand, OleCommandExecutionOption, Object)	Causes the specified command to execute.
	ExecuteCommand(array<Int32[], OleCommand, OleCommandExecutionOption, Object)	Causes the specified command to execute on multiple items.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetCommandStatus	Retrieves the status of the commands executing on the specified items.
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnSiteChanged	Raises the SiteChanged event. (Inherited from ObjectWithSite.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Events

	Name	Description
	SiteChanged	Event that is raised when the Site property is changed. (Inherited from ObjectWithSite.)

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Explicit Interface Implementations

	Name	Description
	IObjectWithSite.GetSite	Retrieves the last site set using the IObjectWithSite.SetSite method. In cases where there is no known site, the object returns an exception. (Inherited from ObjectWithSite.)
	IObjectWithSite.SetSite	Provides the site's pointer to the site object. (Inherited from ObjectWithSite.)

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Remarks

Implement this object in cases where a data provider has custom commands, or wishes to implement their own version of common commands. Without this class a data provider can only reference native command handler implementations.

When a data provider executes a command, it may want to trigger updates in the data view—for example, by adding, renaming, moving, refreshing, or deleting various object nodes. In order to notify the data view of such changes, a data provider should use methods on the DataViewHierarchyAccessor class provided as a property on this class.

Classes derived from this one should implement the GetCommandStatus method by using the protected DataViewHierarchyAccessor class to contextualize the specified itemIds, and then implement the ExecuteCommand method to actually execute the commands that were indicated as supported.

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.

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