Using eventhandler to change the folder's content type

In Sharepoint 2010, you can not set different content type content type for different folders in document library through GUI. Luckily, you can use Event handler to make it.

 

The following code implement that if you create folder whose name contains "Audio", its content type will be changed to Audio.

 

So before doing this, please make sure that your parent document library has "Audio" content type.

 

using System;using System.Security.Permissions;using Microsoft.SharePoint;using Microsoft.SharePoint.Security;using Microsoft.SharePoint.Utilities;using Microsoft.SharePoint.Workflow;using System.Collections.Generic;namespace FolderContentEvent.EventReceiver1{ /// <summary> /// List Item Events /// </summary> public class EventReceiver1 : SPItemEventReceiver { /// <summary> /// An item was added. /// </summary> public override void ItemAdded(SPItemEventProperties properties) { base.ItemAdded(properties); SPListItem added = properties.ListItem; SPContentType fld = added.ParentList.ContentTypes["Folder"]; SPContentType audio = added.ParentList.ContentTypes["Audio"]; // when the added item is a folder if (added.ContentTypeId == fld.Id) { SPFolder addedFolder = added.Folder; //IList<SPContentType> currentContentTypes = addedFolder.ContentTypeOrder; List<SPContentType> cts = new List<SPContentType>(); if (added.Title.ToLower().Contains("audio")) { cts.Add(audio); addedFolder.UniqueContentTypeOrder = cts; addedFolder.Update(); } } } }}