RoundtripOriginalAttribute Class
[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.
Namespace: System.ComponentModel.DataAnnotations
Assembly: System.Web.Http.Data (in System.Web.Http.Data.dll)
The RoundtripOriginalAttribute type exposes the following members.
| Name | Description | |
|---|---|---|
![]() | RoundtripOriginalAttribute | Initializes a new instance of the RoundtripOriginalAttribute class. |
| 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.) |
| 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.) |
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 Nothing in the original object sent back to the server.
Caution |
|---|
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. |





Caution