OfTypeExpression Class

.NET Framework (current version)

Provides a way to filter a query based on a specified type.

Namespace: System.Web.UI.WebControls.Expressions
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)

Inheritance Hierarchy

System::Object
System.Web.UI.WebControls.Expressions::DataSourceExpression
System.Web.UI.WebControls.Expressions::OfTypeExpression

Syntax

C++

public ref class OfTypeExpression : DataSourceExpression

Constructors

	Name	Description
	OfTypeExpression()	Initializes a new instance of the OfTypeExpression class.
	OfTypeExpression(Type^)	Initializes a new instance of the OfTypeExpression class using a specified type.

Properties

	Name	Description
	Context	Gets the HttpContext instance of the owner control.(Inherited from DataSourceExpression.)
	DataSource	Gets the data source object that is associated with the owner control.(Inherited from DataSourceExpression.)
	IsTrackingViewState	Gets a value that indicates whether a data source expression object is tracking its view state changes.(Inherited from DataSourceExpression.)
	Owner	Gets the owner control.(Inherited from DataSourceExpression.)
	TypeName	Gets or sets the type that the filter is based on.
	ViewState	Gets an instance of the StateBag class that contains the current view state information.(Inherited from DataSourceExpression.)

Methods

	Name	Description
	Equals(Object^)	Determines whether the specified object is equal to the current object.(Inherited from Object.)
	Finalize()	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)
	GetHashCode()	Serves as the default hash function. (Inherited from Object.)
	GetQueryable(IQueryable^)	Returns the query that the OfTypeExpression was performed on. (Overrides DataSourceExpression::GetQueryable(IQueryable^).)
	GetType()	Gets the Type of the current instance.(Inherited from Object.)
	LoadViewState(Object^)	Loads the state of the values in the DataSourceExpression object that must be persisted.(Inherited from DataSourceExpression.)
	MemberwiseClone()	Creates a shallow copy of the current Object.(Inherited from Object.)
	SaveViewState()	Saves the current view state of the DataSourceExpression object.(Inherited from DataSourceExpression.)
	SetContext(Control^, HttpContext^, IQueryableDataSource^)	Sets the HTTP context of the DataSourceExpression object that uses the specified owner control, HttpContext instance, and IQueryableDataSource object.(Inherited from DataSourceExpression.)
	SetDirty()	Marks the DataSourceExpression object so that its state will be saved in view state.(Inherited from DataSourceExpression.)
	ToString()	Returns a string that represents the current object.(Inherited from Object.)
	TrackViewState()	Tracks view state changes of the DataSourceExpression object so that the changes can be stored in the StateBag object for the data source expression object.(Inherited from DataSourceExpression.)

Explicit Interface Implementations

	Name	Description
	IStateManager::LoadViewState(Object^)	When implemented by a class, loads the previously saved view state of the data source expression object.(Inherited from DataSourceExpression.)
	IStateManager::SaveViewState()	When implemented by a class, saves the current view state of the DataSourceExpression object.(Inherited from DataSourceExpression.)
	IStateManager::TrackViewState()	When implemented by a class, tracks view state changes of the DataSourceExpression object so that the changes can be stored in the StateBag object for the data source expression object.(Inherited from DataSourceExpression.)
	IStateManager::IsTrackingViewState	When implemented by a class, gets a value that indicates whether a data source expression object is tracking its view state changes.(Inherited from DataSourceExpression.)

Remarks

This expression filters out elements in the data source that are not of the specified type.

Version Information

.NET Framework
Available since 4.0

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.