LocalItemChange Class

Represents a change to an item in the local replica that is returned by EnumerateChanges(Byte(), AnchorEnumerationContext, Byte()).

System.Object
  Microsoft.Synchronization.SimpleProviders.LocalItemChange

Namespace:  Microsoft.Synchronization.SimpleProviders
Assembly:  Microsoft.Synchronization.SimpleProviders (in Microsoft.Synchronization.SimpleProviders.dll)

'Declaration
Public Class LocalItemChange
'Usage
Dim instance As LocalItemChange

The LocalItemChange type exposes the following members.

  NameDescription
Public methodLocalItemChangeInitializes a new instance of the LocalItemChange class that contains the item key and version, and the type of change to the item.
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  NameDescription
Public propertyKeyAndVersionReturns the key and version that identify the changed item.
Public propertyLocalItemChangeTypeReturns a LocalItemChangeType enumeration value that specifies whether an item was created, updated, or deleted.
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  NameDescription
Public methodEquals (Inherited from Object.)
Protected methodFinalize (Inherited from Object.)
Public methodGetHashCode (Inherited from Object.)
Public methodGetType (Inherited from Object.)
Protected methodMemberwiseClone (Inherited from Object.)
Public methodToString (Inherited from Object.)
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The following code example shows an implementation of the EnumerateChanges method for a sample application that stores items in an in-memory store. The LocalItemChange object is used to store the change for each item in the store that has changed since the last anchor. To view this code in the context of a complete application, see the "Sync101 using Simple Sync Provider" application that is available in the Sync Framework SDK and from Code Gallery.

public override void EnumerateChanges(byte[] anchor, AnchorEnumerationContext context)
{
    List<LocalItemChange> itemChanges = new List<LocalItemChange>();

    int startIndex = -1;

    if (anchor != null)
    {
        startIndex = _store.Changes.IndexOfKey(BitConverter.ToUInt64(anchor, 0));
    }

    for (int i = startIndex + 1; i < _store.Changes.Count; i++)
    {
        itemChanges.Add(_store.Changes.Values[i]);
    }

    // If the anchor is corrupt or out of date we could revert back to 
    // full enumeration mode for this session, and enumerate all items. 
    // This is done by calling context.ReportItemsAndAutodetectDeletes.
    context.ReportChanges(itemChanges, _store.GetAnchor());
}


Public Overrides Sub EnumerateChanges(ByVal anchor As Byte(), ByVal context As AnchorEnumerationContext)
    Dim itemChanges As New List(Of LocalItemChange)()

    Dim startIndex As Integer = -1

    If anchor IsNot Nothing Then
        startIndex = _store.Changes.IndexOfKey(BitConverter.ToUInt64(anchor, 0))
    End If

    For i As Integer = startIndex + 1 To _store.Changes.Count - 1
        itemChanges.Add(_store.Changes.Values(i))
    Next

    ' If the anchor is corrupt or out of date we could revert back to 
    ' full enumeration mode for this session, and enumerate all items. 
    ' This is done by calling context.ReportItemsAndAutodetectDeletes. 
    context.ReportChanges(itemChanges, _store.GetAnchor())
End Sub


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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