RoundtripOriginalAttribute Class

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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


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


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

The RoundtripOriginalAttribute type exposes the following members.


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



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



  Name Description
Public method Equals Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Returns the hash code for this instance. (Inherited from Attribute.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method 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.)
Public method Match When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)


Explicit Interface Implementations

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



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.


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.

See Also


System.ComponentModel.DataAnnotations Namespace