SPWeb.GetChanges method (SPChangeToken, SPChangeToken)

Gets the changes logged over a specified period of time.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

Syntax

'Declaration
Public Function GetChanges ( _
    changeToken As SPChangeToken, _
    changeTokenEnd As SPChangeToken _
) As SPChangeCollection
'Usage
Dim instance As SPWeb
Dim changeToken As SPChangeToken
Dim changeTokenEnd As SPChangeToken
Dim returnValue As SPChangeCollection

returnValue = instance.GetChanges(changeToken, _
    changeTokenEnd)
public SPChangeCollection GetChanges(
    SPChangeToken changeToken,
    SPChangeToken changeTokenEnd
)

Parameters

Return value

Type: Microsoft.SharePoint.SPChangeCollection
The changes.

Exceptions

Exception Condition
SPException

changeToken or changeTokenEnd refers to a point before the start of the current change log.

Remarks

To construct the SPChangeToken object for this method, pass SPChangeCollection.CollectionScope Web as the constructor’s first argument, the value of the current object’s SPWeb.ID property as the second argument, and a DateTime object as the third argument.

In addition, the following rules apply:

  • If the position of changeTokenEnd in the change log is before the position of changeToken in the change log, this method returns an empty collection.

  • If changeToken is null , the change collection that is returned starts at the beginning of the current change log.

  • If changeTokenEnd is null , the change collection that is returned includes all changes after the position specified by changeToken, up to the limit for a single collection. If more changes occurred in this period, the first batch is returned.

Note

By default, the change log retains data for 60 days. To change the default retention period, set the ChangeLogRetentionPeriod property.

Examples

The following example is a console application that queries the change log for changes that took place during a period of seven days. The application then prints information about each change to the console.

using System;
using Microsoft.SharePoint;

namespace Test
{
   class ConsoleApp
   {
      static void Main(string[] args)
      {
         using (SPSite siteCollection = new SPSite("http://localhost"))
         {
            using (SPWeb webSite = siteCollection.RootWeb)
            {
               SPTimeZone timeZone = webSite.RegionalSettings.TimeZone;
               long total = 0;

               SPChangeToken startToken = new SPChangeToken(
                  SPChangeCollection.CollectionScope.Web, 
                  webSite.ID,
                  new DateTime(2008, 11, 17));

               SPChangeToken endToken = new SPChangeToken(
                  SPChangeCollection.CollectionScope.Web, 
                  webSite.ID,
                  new DateTime(2008, 11, 23));

               SPChangeCollection changes = webSite.GetChanges(startToken, endToken);
               while (changes.Count > 0)
               {
                  total += changes.Count;

                  foreach (SPChange change in changes)
                  {
                     Console.WriteLine("\nDate: {0}", timeZone.UTCToLocalTime(change.Time).ToString());
                     Console.WriteLine("Object type: {0}", change.GetType().ToString());
                     Console.WriteLine("Change type: {0}", change.ChangeType);
                  }

                  startToken = changes.LastChangeToken;
                  changes = webSite.GetChanges(startToken, endToken);
               }
               Console.WriteLine("\nTotal changes = {0:#,#}", total);
            }
         }
         Console.Write("\nPress ENTER to continue...");
         Console.ReadLine();
      }
   }
}
Imports System
Imports Microsoft.SharePoint

Module ConsoleApp
   Sub Main()
      Using siteCollection As SPSite = New SPSite("http://localhost")
         Using webSite As SPWeb = siteCollection.RootWeb
            Dim timeZone As SPTimeZone = webSite.RegionalSettings.TimeZone
            Dim total As Long = 0

            Dim startToken As New SPChangeToken(SPChangeCollection.CollectionScope.Web, _
                                                webSite.ID, _
                                                New DateTime(2008, 11, 17))

            Dim endToken As New SPChangeToken(SPChangeCollection.CollectionScope.Web, _
                                              webSite.ID, _
                                              New DateTime(2008, 11, 23))

            Dim changes As SPChangeCollection = webSite.GetChanges(startToken, endToken)
            While changes.Count > 0
               total += changes.Count

               For Each change As SPChange In changes

                  Console.WriteLine(vbCrLf + "Date: {0}", timeZone.UTCToLocalTime(change.Time).ToString())
                  Console.WriteLine("Object type: {0}", change.GetType().ToString())
                  Console.WriteLine("Change type: {0}", change.ChangeType)

               Next change

               startToken = changes.LastChangeToken
               changes = webSite.GetChanges(startToken, endToken)

            End While

            Console.WriteLine(vbCrLf + "Total changes = {0:#,#}", total)

         End Using
      End Using
      Console.Write(vbCrLf + "Press ENTER to continue...")
      Console.ReadLine()
   End Sub
End Module

See also

Reference

SPWeb class

SPWeb members

GetChanges overload

Microsoft.SharePoint namespace

Other resources

Using the Change Log