Associate custom content type to existing Document Libraries using feature event reciever:-
Open “Empty SharePoint
Project” in visual studio and later add “Content type” and “Empty Element” for
site columns, by using Add->New Item option in solution explorer, as shown
in below image
After adding xml for Content
type and site column, right click Feature in solution explorer and add event receiver
for the same
Open “Event Reciever”
and create code as given below
#region Fields
string sCollectionNames="ApplicationDocumentation,Correspondence,"+
"LeasingDocumentation,LoanDocumentation,ManagementDocumentation,"+
"PropertyDocumentation,TransactionalDocumentation,UnmatchedDocuments";
string sCustomContentTypeName = "Debt Asset Content Type";
#endregion
#region
Feature Activated event
/// <summary>
/// This event will get
triggered once the fetaure is activated
/// </summary>
/// <param name="properties"></param>
public override void FeatureActivated(SPFeatureReceiverProperties
properties)
{
using (var web =
properties.Feature.Parent as SPWeb)//To get current
web
{
string[]
sListNames=sCollectionNames.Split(',');//Extract Library name from string variable using
"," as delimiter
foreach(string
sListName in sListNames)//Loop through every collection..
fnAssociateContentTypeToList(web, sListName, sCustomContentTypeName);
}
}
#endregion
#region
Function is used to associate content type to corresponding list.
/// <summary>
/// This function is used
to associate content type to corresponding list.
/// </summary>
/// <param
name="web">The web where the list
exists</param>
/// <param name="sListName">List name to which content type has to be associated</param>
/// <param name="sContentTypeName">Content type which needs to be associated to collection</param>
private void
fnAssociateContentTypeToList(SPWeb web, string sListName,string
sContentTypeName)
{
web.AllowUnsafeUpdates = true;
SPList list = web.Lists.TryGetList(sListName);//Will get the list if it exists, or else will return null.
if (list != null)//Check if list exists
{
list.ContentTypesEnabled = true;//Enable allow content types.
if (web.ContentTypes[sContentTypeName]
!= null)//Check
whether corresponding content type exists at respective web
{
SPContentType oContentType =
web.ContentTypes[sContentTypeName]; //Get content
type using its name
list.ContentTypes.Add(oContentType);//Add
content type to list
}
list.Update();//Updat the changes
fnChangeContentTypeOrder(list, sContentTypeName);//Call this function to change content type ordering
web.AllowUnsafeUpdates = false;
}
}
#endregion
#region
Function is used to change content type ordering
/// <summary>
/// This function is used
to change content type ordering
/// </summary>
/// <param name="list">List for which ordering has to be implemented</param>
/// <param name="sContentTypeName">Content type name which has to come first</param>
private void
fnChangeContentTypeOrder(SPList list, string sContentTypeName)
{
//Make this the default content type
IList<SPContentType>
ctorder = list.RootFolder.ContentTypeOrder;//Get the
content type order for list
SPContentType[]
newCTorder = new SPContentType[1];
for (int i = 0; i
< ctorder.Count; i++)//Loop through associated
content types order
{
SPContentType ct = ctorder[i];
if (ct.Name.Equals(sContentTypeName))//Check if the name is matching with param sContentTypeName
{
newCTorder[0] = ct;//Set param
sContentTypeName as first and defaul
}
}
// Set the new order and update folder
list.RootFolder.UniqueContentTypeOrder = newCTorder;
list.RootFolder.Update();
}
#endregion
#region
Feature Deactivating event
/// <summary>
/// This event will get
triggered while deactivating the feature
/// </summary>
/// <param name="properties"></param>
public override void FeatureDeactivating(SPFeatureReceiverProperties
properties)
{
using (var web =
properties.Feature.Parent as SPWeb)
{
fnRemoveContentTypeFromList(web, sCustomContentTypeName);
}
}
#endregion
#region
Function is used to remove content type association with list
/// <summary>
/// This function is used
to remove content type association with list
/// </summary>
/// <param name="web"></param>
/// <param
name="sContentTypeName"></param>
private void
fnRemoveContentTypeFromList(SPWeb web, string sContentTypeName)
{
// Get the obsolete content type.
SPContentType obsolete =
web.ContentTypes[sContentTypeName];
if (obsolete != null)
// We have a content type.
{
IList<SPContentTypeUsage>
usages = SPContentTypeUsage.GetUsages(obsolete);
if (usages.Count > 0) // It is in use.
{
//throw new SPException("The content type
is in use in the following locations:");
foreach (SPContentTypeUsage
usage in usages)
{
if (usage.IsUrlToList)
{
string[] sUsageUrl=usage.Url.Split('/');
SPList oList =
web.Lists[sUsageUrl[sUsageUrl.Length - 1]];
if (oList.BaseType == SPBaseType.DocumentLibrary)
{
web.AllowUnsafeUpdates
= true;
if (oList.ContentTypes[sContentTypeName] != null)
{
oList.ContentTypes[sContentTypeName].Delete();
}
oList.Update();
web.AllowUnsafeUpdates = false;
}
}
}
}
else // The
content type is not in use.
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
web.ContentTypes.Delete(obsolete.Id);
});
}
}
else // No content type
found.
{
throw new
SPException("The
content type does not exist in this site collection.");
}
}
#endregion
Activate
Feature:-
Once after this
deploy the code and activate feature, the scope of this feature is “Web”.
Testing:-
Navigate to any specified
doc library and check for default content type in list settings. It should show
custom content type as default one.
Deactivate
Feature:-
Deactivate the feature, this should remove custom content type from all associated specified lists.
Deactivate the feature, this should remove custom content type from all associated specified lists.
Testing:-
Navigate to any specified
doc library and check for default content type in list settings, it should get
revert back to document content type
Note :- When you run this project from visual studio for more than one time, you will face some caching error. it's adviced either to close and reopen visual studio for every run or execute the following command in powershell "stop-process -processname vssphost4 -force", or Go to windows task manager and delete the process named "vssphost4.exe".
