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How to add the existing site column to the Content type in SharePoint

Posted by Vijai Anand Articles | SharePoint February 18, 2011
In this article we will be seeing how to add the existing site column to the content type in SharePoint.
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In this article we will be seeing how to add the existing site column to the content type in SharePoint.

Adding a existing site column to the content type using powershell script

$site = Get-SPSite -Identity "http://serverName:4001/"
$web = $site.RootWeb

$ct=$web.ContentTypes["_Custom Content Type"];
$fieldAdd=$web.Fields["Custom Site Column"]
$fieldLink=New-Object Microsoft.SharePoint.SPFieldLink($fieldAdd)
$ct.FieldLinks.Add($fieldLink);
$ct.Update()

$web.Dispose()
$site.Dispose()


The existing content type "Custom Site column" is added to the content type "_Custom Content Type".

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Adding a existing site column to the content type using C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;

namespace Testing
{
    class Program
    {
        static void Main(string[] args)
        {
            using (SPSite site = new SPSite("http://serverName:4001/"))
            {
                using (SPWeb web = site.RootWeb)
                {
                    SPContentType ct = web.ContentTypes["_Custom Content Type"];
                    SPField field = web.Fields["Custom Site Column"];
                    SPFieldLink fieldLink = new SPFieldLink(field);
                    ct.FieldLinks.Add(fieldLink);
                    ct.Update();
                }
            }
        }
    }
}


$site = Get-SPSite -Identity "http://serverName:4001/"
$web = $site.RootWeb
$field=$web.Fields["Custom Site Column"]
$field.Type= "Choice"
$field.Update($true)
$web.Dispose()
$site.Dispose()


The property of the existing site column is changed from "Text" to "Choice".

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