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Using Changes to Query for Objects

Windows SharePoint Services 3

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The Change Log provides information about the objects that have changed: the type of each object, its GUID, and the GUID of its parent object. The client can use these values to retrieve the object.

The following example illustrates how a client can use the SPChange object to retrieve its corresponding SharePoint object.

Dim mySiteCollection As New SPSite("http://siteUrl")
Dim myWebSite As SPWeb = mySiteCollection.RootWeb
Dim initToken As SPChangeToken = myWebSite.CurrentChangeToken
' Changing the title of the web.
myWebSite.Title = "My New Title"
myWebSite.Update()

Dim changes As SPChangeCollection = myWebSite.GetChanges(initToken)
Dim changedObject As SPChangeWeb = Nothing
Dim changedObjectGuid As New Guid()
Dim changedObjectSiteId As New Guid()

Dim change As SPChange
For Each change In  changes
    If TypeOf change Is Microsoft.SharePoint.SPChangeWeb Then
        changedObject = CType(change, SPChangeWeb)
        changedObjectGuid = changedObject.Id
        changedObjectSiteId = changedObject.SiteId
    End If
Next change

' Now that we have the GUIDs of the changed object
'and its parent object, we can retrieve the objects.
Dim changedSite As New SPSite(changedObjectSiteId)
Dim changedWebSite As SPWeb = changedSite.AllWebs(changedObjectGuid)

SPSite mySiteCollection = new SPSite("http://siteUrl");
SPWeb myWebSite = mySiteCollection.RootWeb;
SPChangeToken initToken = myWebSite.CurrentChangeToken;
/* Changing the title of the web.*/
myWebSite.Title = "My New Title";
myWebSite.Update();

SPChangeCollection changes = myWebSite.GetChanges(initToken);
SPChangeWeb changedObject = null;
Guid changedObjectGuid = new Guid();
Guid changedObjectSiteId = new Guid();

foreach (SPChange change in changes)
{
    if (change is Microsoft.SharePoint.SPChangeWeb)
    { 
        changedObject = (SPChangeWeb)change;
        changedObjectGuid = changedObject.Id;
        changedObjectSiteId = changedObject.SiteId;
    }
}

/* Now that we have the GUIDs of the changed object
and its parent object, we can retrieve the objects.*/
SPSite changedSite = new SPSite(changedObjectSiteId);
SPWeb changedWebSite = changedSite.AllWebs[changedObjectGuid];
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