How to add ContentTypes to a Sharepoint Web with C#?

Question

I am trying to migrate a site using a C# script and I am currently writing the code to migrate Content Types of the site. Here's what I have so far.

public static void AddContentType(SPWeb web, SPContentType ct)  
        {  
            try  
            {  
                SPContentType newCt = web.ContentTypes[ct.Name];  
                if (newCt == null)  
                {  
                        web.AllowUnsafeUpdates = true;  
                        Console.WriteLine("Does not exist");  
                        newCt = new SPContentType(ct.Parent, web.ContentTypes, ct.Name);  
                        web.ContentTypes.Add(newCt);  
                        web.Update();  
                        web.AllowUnsafeUpdates = false;  
                }  
                 
                else  
                {  
                    Console.WriteLine("Skipping as it already exists");  
                }  
            }  
            catch (Exception e)  
            {  
                Console.WriteLine(e.Message);  
            }  
        }  

However, when it hits newCt = new SPContentType(ct.Parent, web.ContentTypes, ct.Name);, , it throws the following error every time.

Microsoft.SharePoint.SPException: A content type cannot be added outside of its  
scope.  
   at Microsoft.SharePoint.SPContentType.Initialize(SPContentType parentContentT  
ype, SPContentTypeCollection collection, String name)  
   at Microsoft.SharePoint.SPContentType..ctor(SPContentType parentContentType,  
SPContentTypeCollection collection, String name)  
   at MigrateSite.Program.AddContentType(SPWeb web, SPContentType ct) in c:\User  
s\svcmmo13farm_dev\Source\Repos\MigrateSite\MigrateSite\Program.cs:line 230  

I don't know what that means. Can you please help?
Thanks in advance.

Answer 1

Hi @Puneeth, C ,
Could you try to use ContentType class instead of SPContentType. You can refer to the following code

string siteUrl = "http://MyServer/sites/MySiteCollection";  

ClientContext clientContext = new ClientContext(siteUrl);  
Web site = clientContext.Web;  
ContentTypeCollection collContentType = site.ContentTypes;  

// Initialize a new content type.  
ContentTypeCreationInformation contentInfo = new ContentTypeCreationInformation();  
contentInfo.Name = "myContentType";  
contentInfo.Description = "My custom content type";  
ContentType contentType = collContentType.Add(contentInfo);  

clientContext.Load(collContentType);  
clientContext.ExecuteQuery();  

foreach (ContentType myType in collContentType){  
    Console.WriteLine("Content Type Name: {0}", myType.Name);  
    }  

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