SharePoint - Client Side Object Model(CSOM) - Managed - Add Item to an Existing List

Problem Definition

Add Item with data to Existing List using Managed Code and Client Side Object Model(CSOM) for SharePoint 2013.

Prerequisites

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Code Example

 /// <summary>

 /// Add Item with data to list

 /// </summary>

 /// <param name="title"></param>

 /// <param name="itemssWithFieldValuePairs">Pass a Comma Separated combination of field title and Value and separate the combo with a semicolon

 /// Eg: "Title,Test Entry;FirstName,TestFName;LastName,TestLName"

 /// </param>

 public static void AddItemToList(string title, string itemssWithFieldValuePairs)

 {

            try

            {

                //var spContext = new ClientContext("http://<your server>/<site>/");

                using (spContext)

                {

                    // Client side SP Web Conext

                    var web = spContext.Web;

                    // Define Exception scope for the site context.

                    var exScope = new ExceptionHandlingScope(spContext);

                    // Get list by its title

                    List list = web.Lists.GetByTitle(title);

                    // Parse new fields to be added

                    var fieldsDict = itemssWithFieldValuePairs.Split(';').ToList().ToDictionary(x => x.Split(',')[0].Trim(), x => x.Split(',')[1].Trim());

                    // Set up a list item creation information object

                    var lici = new ListItemCreationInformation();

                    var item = list.AddItem(lici);

                    item["Title"] = fieldsDict["Title"];

                    item["FirstName"] = fieldsDict["FirstName"];

                    item["LastName"] = fieldsDict["LastName"];

                    //Update item

                    item.Update();

                    // Execute the query to finalize your add

                    spContext.ExecuteQuery();

                    Console.WriteLine("Added Successfully!!!");

                }

            }

            catch (Exception ex)

            {

                // Print error message

                Console.WriteLine(ex.ToString());

            }

 }

Code Result