Creating a ContentType with new Site Field in SharePoint 2010 using Client Object Model (C#)

Step 1: Create New Project (Minimum .NET Framework 3.5)

Step 2: Add “Microsoft.SharePoint.Client” and “Microsoft.SharePoint.Client.Runtime” namespaces

Step 3: Write the following code.

using System;

//SharePoint namespace

using Microsoft.SharePoint.Client;

namespace CreatingContentTypes

{

    class Program

    {

        static void Main(string[] args)

        {

            string siteUrl = "http://sharepointserver.com";

            ClientContext clientContext = new ClientContext(siteUrl);

            clientContext.Credentials = new System.Net.NetworkCredential("admin", "password", "sharepointserver.com");

            Web site = clientContext.Web;

            clientContext.Load(site);

            clientContext.ExecuteQuery();

            //Getting content type name

            Console.Write("ContentType Name: ");

            string contentTypeName = Console.ReadLine();

        }

        static void CreateContentType(Web site, ClientContext clientContext, string contentTypeName)

        {

            ContentTypeCollection contentTypeCollection = site.AvailableContentTypes;

            clientContext.Load(contentTypeCollection);

            clientContext.ExecuteQuery();

            int count = 0;

            //Checking whether the ContentType already exists

            foreach (ContentType item in contentTypeCollection)

            {

                clientContext.Load(item);

                clientContext.ExecuteQuery();

                if (item.Name.ToUpper() == contentTypeName.ToUpper())

                    count++;

            }

            //If doesnot exist, create it

            if (count == 0)

            {

                Console.Write("SiteField Name: ");

                string siteFieldName = Console.ReadLine();

                string siteField =

                    "<Field Type = 'Text' " +

                    "Hidden = 'False' " +

                    "DisplayName = '" + siteFieldName + "' " +

                    "ResultType = 'Text' " +

                    "ReadOnly = 'False' " +

                    "Name = '" + siteFieldName + "' " +

                    "Group = 'Custom Columns'></Field>";

                Field field = site.Fields.AddFieldAsXml(siteField, false, AddFieldOptions.AddFieldToDefaultView);

                clientContext.ExecuteQuery();

                FieldLinkCreationInformation fieldLink = new FieldLinkCreationInformation();

                fieldLink.Field = field;

                //Creating ContentType

                ContentTypeCreationInformation contentType = new ContentTypeCreationInformation();

                contentType.Name = contentTypeName;

                contentType.Group = "SampleGroup";

                contentType.ParentContentType = contentTypeCollection[0].Parent;

                ContentType myContentType = site.ContentTypes.Add(contentType);

                //Adding fields to ContentType

                myContentType.FieldLinks.Add(fieldLink);

                field.Update();

                myContentType.Update(true);

                clientContext.ExecuteQuery();

                site.Update();

                Console.WriteLine("ContentType Created Successfully");

                Console.ReadLine();

            }

            else

            {

                Console.WriteLine("ContentType already presents in the site.");

                Console.Write("Enter another ContentType name: ");

                string content = Console.ReadLine();

                CreateContentType(site, clientContext, content);

            }

        }

    }

}