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MergeOption Enumeration

Determines the synchronization option for sending or receiving entities to or from WCF Data Services. 

Namespace:  System.Data.Services.Client
Assembly:  Microsoft.Data.Services.Client (in Microsoft.Data.Services.Client.dll)
public enum MergeOption
Member nameDescription
AppendOnlyAppend new entities only. Existing entities or their original values will not be modified. No client-side changes are lost in this merge. This is the default behavior.

NoTrackingObjects are always loaded from persisted storage. Any property changes made to objects in the object context are overwritten by the data source values.

OverwriteChangesAll current values on the client are overwritten with current values from the data service regardless of whether they have been changed on the client.

PreserveChangesCurrent values that have been changed on the client are not modified, but any unchanged values are updated with current values from the data service. No client-side changes are lost in this merge.

This value is used when materializing objects. Set this property to the appropriate materialization option before executing any queries or updates to the data service. The default value is MergeOption.AppendOnly.

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