SPList.GetChanges Method (SPChangeToken, SPChangeToken)

Returns a collection of changes logged over a specified period of time.

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

public SPChangeCollection GetChanges(
	SPChangeToken changeToken,
	SPChangeToken changeTokenEnd
)

Parameters

changeToken
Type: Microsoft.SharePoint.SPChangeToken

The starting date and time.

changeTokenEnd
Type: Microsoft.SharePoint.SPChangeToken

The ending date and time.

Return Value

Type: Microsoft.SharePoint.SPChangeCollection
The changes.

ExceptionCondition
SPException

changeToken or changeTokenEnd is not a valid token.

When you construct the SPChangeToken objects to use with this method, pass SPChangeCollection.CollectionScope.List as the constructor’s first argument, the value of the current object’s SPList.ID property as the second argument, and a DateTime object as the third argument.

In addition, the following rules apply:

  • If either token refers to a time before the start of the current change log, the method throws an exception.

  • If the time of the second token is before the time of the first token, the method returns an empty collection.

  • If the first token is a null reference (Nothing in Visual Basic), the change collection that is returned starts at the beginning of the current change log.

  • If the second token is a null reference (Nothing in Visual Basic), the change collection that is returned includes all changes after the date specified by the first change token, up to the limit for a single collection. If more changes occurred in this period, the first batch is returned.

NoteNote

By default, the change log retains data for 60 days. You can configure the retention period by setting the ChangeLogRetentionPeriod property.

The following example is a console application that queries the change log for changes to a list during a period of seven days. After retrieving the changes, the application 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.OpenWeb())
            {
               // Get a list.
               SPList list = webSite.Lists[0];

               SPChangeToken startToken = new SPChangeToken(
                  SPChangeCollection.CollectionScope.List,
                  list.ID,
                  new DateTime(2008, 10, 12));

               SPChangeToken endToken = new SPChangeToken(
                  SPChangeCollection.CollectionScope.List,
                  list.ID,
                  new DateTime(2008, 10, 18));


               SPTimeZone timeZone = webSite.RegionalSettings.TimeZone;
               int total = 0;

               // Get the first batch of changes.
               SPChangeCollection changes = list.GetChanges(startToken, endToken);

               // Loop until we reach the end of the log.
               while (changes.Count > 0)
               {
                  total += changes.Count;

                  // Print info about each change to the console.
                  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: {0}", change.ChangeType.ToString());
                  }

                  // Go get another batch.
                  startToken = changes.LastChangeToken;
                  changes = list.GetChanges(startToken, endToken);
               }

               Console.WriteLine("\nTotal of {0} changes to {1} list", total, list.Title);
            }
         }
         Console.Write("\nPress ENTER to continue...");
         Console.ReadLine();
      }
   }
}
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