This is what bing ai copilot says:
using Microsoft.SharePoint.Client;
ClientContext clientContext = new ClientContext("https://yoursharepointsiteurl");
List targetList = clientContext.Web.Lists.GetByTitle("Your List Title");
// Define the new field
FieldCreationInformation newFieldInfo = new FieldCreationInformation(FieldType.Text)
{
DisplayName = "New Column",
InternalName = "NewColumn",
Group = "Custom Columns",
AddToDefaultView = true
};
// Add the new field to the list
Field newField = targetList.Fields.Add(newFieldInfo);
clientContext.ExecuteQuery();
Console.WriteLine("New column added successfully.");
This does not help. I have some string types for columns, datetime tyhpes for columns, and some double types for columns. This bit of code does not explain how I manage to add those column types.
So I asked chatgpt.com
in C# how do I use the FieldCollection class Add method for adding columns to shaprepoint lists?
using Microsoft.SharePoint;
using System;
namespace SharePointAddColumnExample
{
class Program
{
static void Main(string[] args)
{
using (SPSite site = new SPSite("http://yoursitecollection"))
{
using (SPWeb web = site.OpenWeb())
{
// Get the list where you want to add the column
SPList list = web.Lists["Your List Name"];
// Check if the field (column) already exists to avoid duplication
if (!list.Fields.ContainsField("New Column"))
{
// Add a new text column (single line of text)
list.Fields.Add("New Column", SPFieldType.Text, false);
// Update the list to save changes
list.Update();
Console.WriteLine("Column added successfully.");
}
else
{
Console.WriteLine("Column already exists.");
}
}
}
}
}
}
But this does nto work because this is an error:
// Add a new text column (single line of text)
list.Fields.Add("New Column", SPFieldType.Text, false);
the Add methode for Fields does not take three arguments
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