SPChangeQuery Class
Defines a query that is performed against the change log in Microsoft SharePoint Foundation.
Inheritance Hierarchy
System.Object
Microsoft.SharePoint.SPChangeQuery
Namespace: Microsoft.SharePoint
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
Syntax
'Declaration
<SubsetCallableTypeAttribute> _
<ClientCallableTypeAttribute(Name := "ChangeQuery", ServerTypeId := "{887a7218-1232-4cfc-b78f-88d54e9d8ec7}", _
ValueObject := True)> _
Public NotInheritable Class SPChangeQuery
'Usage
Dim instance As SPChangeQuery
[SubsetCallableTypeAttribute]
[ClientCallableTypeAttribute(Name = "ChangeQuery", ServerTypeId = "{887a7218-1232-4cfc-b78f-88d54e9d8ec7}",
ValueObject = true)]
public sealed class SPChangeQuery
Remarks
Use an SPChangeQuery object to define a query that you can pass as an argument to a GetChanges method of the SPList, SPWeb, SPSite, or SPContentDatabase class.
The properties of the SPChangeQuery class can be used to specify filters for the query. There are two types of properties: those that apply to the type of object that has been changed, and those that apply to the type of change that occurred. Use these properties in conjunction with the SPChangeQuery constructor to define a query that will return specific data from the change log.
Examples
The following example is a console application that prints out the login names of users who have been added to groups within a site collection, as well as the groups to which they have been added and the date of the change.
using System;
using Microsoft.SharePoint;
namespace Test
{
class ConsoleApp
{
static void Main(string[] args)
{
using (SPSite siteCollection = new SPSite("https://localhost"))
{
using (SPWeb rootSite = siteCollection.RootWeb)
{
// Construct a query.
SPChangeQuery query = new SPChangeQuery(false, false);
// Set a limit on the number of changes returned on a single trip.
query.FetchLimit = 500;
// object type
query.Group = true;
// change type
query.GroupMembershipAdd = true;
// Get the users and groups for the site collection.
SPUserCollection users = rootSite.AllUsers;
SPGroupCollection groups = rootSite.Groups;
// Convert to local time.
SPTimeZone timeZone = rootSite.RegionalSettings.TimeZone;
// total changes
int total = 0;
// Loop until we reach the end of the log.
while (true)
{
SPChangeCollection changes = siteCollection.GetChanges(query);
total += changes.Count; // running total
foreach (SPChangeGroup change in changes)
{
// Try to get the group name.
string groupName = String.Empty;
try
{
SPGroup group = groups.GetByID(change.Id);
groupName = group.Name;
}
catch (SPException)
{
groupName = "Unknown";
}
// Try to get the user name.
string loginName = String.Empty;
try
{
SPUser user = users.GetByID(change.UserId);
loginName = user.LoginName;
}
catch (SPException)
{
loginName = "Unknown";
}
// Write to the console.
Console.WriteLine("\nDate: {0}",
timeZone.UTCToLocalTime(change.Time).ToString());
Console.WriteLine("{0} was added to the {1} group.",
loginName, groupName);
}
// 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 rootSite As SPWeb = siteCollection.RootWeb
' Construct a query.
Dim query As New SPChangeQuery(False, False)
' Set a limit on the number of changes returned on a single trip.
query.FetchLimit = 500
' Select the object type.
query.Group = True
' Select the change type.
query.GroupMembershipAdd = True
' Get the users and groups for the site collection.
Dim users As SPUserCollection = rootSite.AllUsers
Dim groups As SPGroupCollection = rootSite.Groups
' Convert to local time.
Dim timeZone As SPTimeZone = rootSite.RegionalSettings.TimeZone
' total changes
Dim total As Integer = 0
' Loop until we reach the end of the log.
While True
Dim changes As SPChangeCollection = siteCollection.GetChanges(query)
total += changes.Count ' running total
For Each change As SPChangeGroup In changes
' Try to get the group name.
Dim groupName As String = String.Empty
Try
Dim group As SPGroup = groups.GetByID(change.Id)
groupName = group.Name
Catch ex As SPException
groupName = "Unknown"
End Try
' Try to get the user name.
Dim loginName As String = String.Empty
Try
Dim user As SPUser = users.GetByID(change.UserId)
loginName = user.LoginName
Catch ex As SPException
loginName = "Unknown"
End Try
' Write to the console.
Console.WriteLine(vbCrLf + "Date: {0}", _
timeZone.UTCToLocalTime(change.Time).ToString())
Console.WriteLine("{0} was added to the {1} group.", _
loginName, groupName)
Next change
' Break out of loop if we have the last batch.
If changes.Count < query.FetchLimit Then
Exit While
End If
' Otherwise, go get another batch.
query.ChangeTokenStart = changes.LastChangeToken
End While
Console.WriteLine(vbCrLf + "Total of {0:#,#} changes", total)
End Using
End Using
Console.Write(vbCrLf + "Press ENTER to continue...")
Console.ReadLine()
End Sub
End Module
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.