RoundtripOriginalAttribute Class

Article
02/16/2012

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

When applied to a member, this attribute indicates that the original value of the member should be sent back to the server when the object is updated. When applied to a class, the attribute gets applied to each member of that class.

Inheritance Hierarchy

System.Object
System.Attribute
System.ComponentModel.DataAnnotations.RoundtripOriginalAttribute

Namespace: System.ComponentModel.DataAnnotations
Assembly: System.Web.Http.Data (in System.Web.Http.Data.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Property Or AttributeTargets.Field, AllowMultiple := False)> _
Public NotInheritable Class RoundtripOriginalAttribute _
    Inherits Attribute

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)]
public sealed class RoundtripOriginalAttribute : Attribute

[AttributeUsageAttribute(AttributeTargets::Class|AttributeTargets::Property|AttributeTargets::Field, AllowMultiple = false)]
public ref class RoundtripOriginalAttribute sealed : public Attribute

[<Sealed>]
[<AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false)>]
type RoundtripOriginalAttribute =  
    class
        inherit Attribute
    end

public final class RoundtripOriginalAttribute extends Attribute

The RoundtripOriginalAttribute type exposes the following members.

Constructors

	Name	Description
	RoundtripOriginalAttribute	Initializes a new instance of the RoundtripOriginalAttribute class.

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Properties

	Name	Description
	TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)

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Methods

	Name	Description
	Equals	Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
	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	Returns the hash code for this instance. (Inherited from Attribute.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	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.)
	Match	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
	_Attribute.GetTypeInfo	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
	_Attribute.Invoke	Provides access to properties and methods exposed by an object. (Inherited from Attribute.)

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Remarks

You apply the RoundtripOriginalAttribute attribute to a property in an entity when you want to send the value of that property to the server to ensure data concurrency. If this attribute is not present, the value of this member will be null in the original object sent back to the server.

Warning

When you enable users to update or delete data, make sure that the data in the data source has not been changed by another process before you continue with the update or delete. If you do not check whether the values have changed, you can unintentionally overwrite values set by another process.

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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