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I'm migrating a custom list from SharePoint 2010 on-premises to SharePoint Online. The source list has content types enabled and two custom content types associated. When migrating the list, i need to compare the associated content types collections, and add to the destination list all missing content types from the source list.

Here's my code:

var srcCTs = srcList.ContentTypes;
var destCTs = destList.ContentTypes;
var missingCTs = srcList.ContentTypes.Where(ct => !(destList.ContentTypes.Select(dct => dct.<UniqueKey>).Contains(ct.<UniqueKey>)));

where UniqueKey should be a property with unique values. I cannot use properties "Id", "StringId" or "Name" because its values are not unique, so I think I must change the code (or at least the third row)...

How do I check if content type already exists in the destination list?

EDIT: I need to compare both Content Type Collections (srcCTs and destCTs) and extract the difference between them.

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2 Answers 2

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This will return all the content types into a list

var listContentType = ctx.Web.Lists.GetByTitle('listTitle').ContentTypes

A full example

string siteURL = "http://your_site/";
ClientContext clientContext = new ClientContext(siteURL);
ContentTypeCollection contentTypeColl = clientContext.Web.Lists.GetByTitle("listTitle").ContentTypes;
clientContext.Load(contentTypeColl);
clientContext.ExecuteQuery();

//Display the Content Type name
foreach (ContentType ct in contentTypeColl)
{
    Console.WriteLine(ct.Name);
}

Hope be helpful

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  • Thank you for your response, but it's not what I'm looking for. I need to compare two Content Type Collections (coll A and coll B) and extract the difference between them. Commented Dec 1, 2016 at 14:28
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I found a solution using the Parent Content Type (as any association to the list creates a new child instance of the content type).

var missingCTs = srcList.ContentTypes.Where(ct => !(destList.ContentTypes.Select(dct => dct.Parent.StringId).Contains(ct.Parent.StringId))).ToList();
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