SPWeb.GetChanges Method (SPChangeToken)

Gets the changes starting from a specified point in the change log.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online

Syntax

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

returnValue = instance.GetChanges(changeToken)

public SPChangeCollection GetChanges(
    SPChangeToken changeToken
)

Parameters

• changeToken
  Type: Microsoft.SharePoint.SPChangeToken

  The location in the change log starting at which the changes are returned.

Return Value

Type: Microsoft.SharePoint.SPChangeCollection
The changes that have occurred on the website since the location in the change log specified by changeToken.

Exceptions

Remarks

To get an SPChangeToken object to pass as an argument to this method, extract one from the ChangeToken property of the last change returned by a previous call to this method. Or, use the SPChangeToken constructor to create a new change token.

Examples

The following example is a console application that demonstrates how to get all changes in the log. The program loops while getting changes in batches and breaks out of the loop when it retrieves a collection with 0 members, signifying that it has reached the end of the log.

using System;
using Microsoft.SharePoint;

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

               // Start with a null token so we take changes 
               // from the beginning of the log
               SPChangeToken token = null;

               // Get the first batch of changes
                SPChangeCollection changes = webSite.GetChanges(token);

               // Loop until we get zero changes
               while (changes.Count > 0)
               {
                  total += changes.Count;

                  foreach (SPChange change in changes)
                  {
                     // Process the change
                     Console.WriteLine("\nDate: {0}", timeZone.UTCToLocalTime(change.Time).ToString());
                     Console.WriteLine("Type of change: {0}", change.ChangeType.ToString());
                     Console.WriteLine("Object changed: {0}", change.GetType().ToString()); 
                  }

                  // Go get another batch
                  token = changes.LastChangeToken;
                  changes = webSite.GetChanges(token);
               }
               Console.WriteLine("\nTotal = {0:#,#} changes", total);
            }
         }
         Console.Write("\nPress ENTER to continue...");
         Console.ReadLine();
      }
   }
}

Imports System
Imports Microsoft.SharePoint

Module ConsoleApp
   Sub Main()
      Using siteCollection As SPSite = New SPSite("https://localhost")
         Using webSite As SPWeb = siteCollection.RootWeb

            Dim timeZone As SPTimeZone = webSite.RegionalSettings.TimeZone
            Dim total As Long = 0

            ' Start with a null token so we take changes 
            ' from the beginning of the log
            Dim token As SPChangeToken = Nothing

            ' Get the first batch of changes
            Dim changes As SPChangeCollection = webSite.GetChanges(token)

            ' Loop until we get zero changes
            While changes.Count > 0
               total += changes.Count

               For Each change As SPChange In changes
                  ' Process the change
                  Console.WriteLine(vbCrLf + "Date: {0}", timeZone.UTCToLocalTime(change.Time).ToString())
                  Console.WriteLine("Type of change: {0}", change.ChangeType.ToString())
                  Console.WriteLine("Object changed: {0}", change.GetType().ToString())
               Next change

               ' Go get another batch
               token = changes.LastChangeToken
               changes = webSite.GetChanges(token)
            End While

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

CurrentChangeToken

Other Resources

Using the Change Log