SPSite.GetChanges method (SPChangeQuery)
Returns a collection of changes from the change log filtered by the specified query.
Namespace: Microsoft.SharePoint
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Syntax
'Declaration
Public Function GetChanges ( _
query As SPChangeQuery _
) As SPChangeCollection
'Usage
Dim instance As SPSite
Dim query As SPChangeQuery
Dim returnValue As SPChangeCollection
returnValue = instance.GetChanges(query)
public SPChangeCollection GetChanges(
SPChangeQuery query
)
Parameters
query
Type: Microsoft.SharePoint.SPChangeQueryAn SPChangeQuery object that represents the query.
Return value
Type: Microsoft.SharePoint.SPChangeCollection
A collection of SPChange objects that represent changes. You can adjust the maximum size of the collection by setting the FetchLimit property of the SPChangeQuery object that you pass in the query parameter.
Remarks
Use this method to filter changes when you are interested only in changes to particular objects, rather than all objects, or only in selected actions on particular objects. For more information, see the documentation for the SPChangeQuery class.
Note
By default, the change log retains data for 60 days. You can configure the retention period by setting the ChangeLogRetentionPeriod property.
Examples
The following example is a console application that queries the change log for all add, delete, and update operations on content types in a site collection. Note that the application calls the GetChanges method in a loop, fetching changes in batches until all changes have been retrieved.
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)
{
// Construct a query.
SPChangeQuery query = new SPChangeQuery(false, // limit object types
false); // limit change types
// object type
query.ContentType = true;
// change types
query.Add = true;
query.Delete = true;
query.Update = true;
long total = 0;
while (true)
{
SPChangeCollection changes = siteCollection.GetChanges(query);
total += changes.Count;
foreach (SPChangeContentType change in changes)
{
// Get the content type (if it still exists).
SPContentType contentType =
webSite.AvailableContentTypes[change.Id];
// The change might have been to delete the content type.
string contentTypeName;
if (contentType == null)
contentTypeName = "Unknown";
else
contentTypeName = contentType.Name;
Console.WriteLine("\n{0} content type was changed on {1}.",
contentTypeName, change.Time.ToShortDateString());
Console.WriteLine("Type of change: {0}", change.ChangeType.ToString());
}
// Break out of loop if we have the last batch.
if (changes.Count < query.FetchLimit)
break;
// Otherwise, go get another batch.
query.ChangeTokenStart = changes.LastChangeToken;
}
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("https://localhost")
Using webSite As SPWeb = siteCollection.RootWeb
' Construct a query.
Dim query As New SPChangeQuery(False, False)
' object type
query.ContentType = True
' change types
query.Add = True
query.Delete = True
query.Update = True
Dim total As Long = 0
While True
Dim changes As SPChangeCollection = siteCollection.GetChanges(query)
total += changes.Count
For Each change As SPChangeContentType In changes
' Get the content type (if it still exists).
Dim contentType As SPContentType = _
webSite.AvailableContentTypes(change.Id)
' The change might have been to delete the content type.
Dim contentTypeName As String
If contentType Is Nothing Then
contentTypeName = "Unknown"
Else
contentTypeName = contentType.Name
End If
Console.WriteLine(vbCrLf + "{0} content type was changed on {1}.", _
contentTypeName, change.Time.ToShortDateString())
Console.WriteLine("Type of change: {0}", change.ChangeType.ToString())
Next change
' Break out of the loop when we fetch the last batch of changes.
If changes.Count < query.FetchLimit Then
Exit While
End If
' Go get another batch of changes starting where we left off.
query.ChangeTokenStart = changes.LastChangeToken
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
Microsoft.SharePoint namespace