SPItemEventReceiver Class (Microsoft.SharePoint)

Switch on low bandwidth view

Community Content

In this section

Statistics Annotations (13)

Click here to expand

Collapse All

Language Filter

SPItemEventReceiver Class (Microsoft.SharePoint)

Provides methods for trapping events that occur to items. This class is never instantiated.

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

Syntax

Visual Basic (Declaration)

<SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel:=True)> _
<SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel:=True)> _
Public Class SPItemEventReceiver
    Inherits SPEventReceiverBase

Visual Basic (Usage)

Dim instance As SPItemEventReceiver

[SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel=true)] 
[SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel=true)] 
public class SPItemEventReceiver : SPEventReceiverBase

Remarks

The SPItemEventReceiver class is not instantiated but the item event receiver class of a custom event handler must derive from this class and override its methods for the event types that are handled.

If an item is moved, it is treated in the same way as an item that has been removed and then added.

Before and After properties are guaranteed for post events on documents, but Before properties are not available for post events on list items.

Example

The following code example uses the SPItemEventReceiver class to add an item to a specified Announcements list whenever an attachment is added to a list.

using System;
using Microsoft.SharePoint;

namespace Example_Namespace
{
    public class Class_Name : SPItemEventReceiver
    {
        public override void ItemAttachmentAdded(SPItemEventProperties properties)
        {
            using(SPSite oSiteCollectionEvent = new SPSite(properties.SiteId))
            {
                SPWeb oSiteEvent = oSiteCollectionEvent.OpenWeb(properties.RelativeWebUrl);
                SPListItemCollection oItemsEvent = oSiteEvent.Lists[properties.ListTitle].Items;
            }
            using(SPSite oSiteCollection = new SPSite("http://Top_Site"))
            {
                SPWeb oWebsite = oSiteCollection.OpenWeb("Website_Name");
                SPList oList = oWebsite.Lists["Announcements"];
                SPListItemCollection collListItems = oList.Items;

                SPListItem oItem = collListItems.Add();
                oItem["Title"] = properties.UserDisplayName + " added an attachment to " + oItemsEvent[properties.ListItemId].Title + " in list " + properties.ListTitle + " at " + properties.WebUrl;
                oItem.Update();
            }
        }
    }
}

Note:
Certain objects implement the IDisposable interface, and you must avoid retaining these objects in memory after they are no longer needed. For information about good coding practices, see Best Practices: Using Disposable Windows SharePoint Services Objects.

Inheritance Hierarchy

System.Object
   Microsoft.SharePoint.SPEventReceiverBase
    Microsoft.SharePoint.SPItemEventReceiver
       Microsoft.SharePoint.Workflow.SPWorkflowLibraryEventReceiver

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.

Reference

SPItemEventReceiver Members
Microsoft.SharePoint Namespace