Create Content Types and Fields using Powershell

 Below script will work for

1.       1. Add Content Types to the web site

a.       Create a Content Type

b.      Add fields to Content Type

c.       Modify existing fields of  Content Type

d.      Delete fields from Content Type

e.      Create a new field and then add to the content type

2.       2. Add Content Type to the SharePoint List

3.       3. Sorting Content Types in the List

I referred below posts

http://alexbrassington.com/tag/sort-content-types/

http://www.rbradbrook.co.uk/Blog/Post/6/Creating-Content-Types-(and-Site-Columns)-with-PowerShell

Start-SPAssignment -Global

function  Sort-ContentTypes(

       [Microsoft.SharePoint.SPList]$list) {

         Write-Host $list.Title

$rootFolder = $list.RootFolder

$DefaultContentTypeName = "Document"  #setting "Document" as default content type.

 $rootFolder.UniqueContentTypeOrder = $null

 $rootFolder.Update()

#Get content types fromt the button

$contentTypesInPlace = New-Object 'System.Collections.Generic.List[Microsoft.SharePoint.SPContentType]'

$contentTypesInPlace = $rootFolder.ContentTypeOrder

 

#Has a default content type name been specified?

      if ($DefaultContentTypeName)

      {

            $contentType = $contentTypesInPlace | where { $_.Name -eq $DefaultContentTypeName }

            if ($contentType -ne $null)

            {

                  #Add the default content type

                  $sortedListOfContentTypes = New-Object 'System.Collections.Generic.List[Microsoft.SharePoint.SPContentType]'

                  $sortedListOfContentTypes += $list.ContentTypes[$DefaultContentTypeName]

                   

                  #Remove the default content type from the list

                  $contentTypesInPlace = $contentTypesInPlace | where {$_.Name -ne $DefaultContentTypeName}

            }

            else

            {

                  Write-Error "$DefaultContentTypeName was not found in the list, sorting by Name alone"

            }

      }

      else

      {

            Write-host "No default content type specified"

      }

       

      #sort the remaining content types and add the sorted list

      foreach ($contentType in $($contentTypesInPlace | Sort-Object -Property Name ))

      {

      #Add the content types

            $sortedListOfContentTypes = [Microsoft.SharePoint.SPContentType[]] $sortedListOfContentTypes + $contentType

      }

      $rootFolder.UniqueContentTypeOrder = [Microsoft.SharePoint.SPContentType[]] $sortedListOfContentTypes

       

      #Update the root folder

      $rootFolder.Update()

      Write-host "ContentType(s) sorted and added to the dropdownlist in list $($list.Name)"

     

 }

$url = "http://spdev5:8002/sites/library"

$web = get-spweb $url

#The Display Name of the Content Type

$ctypeName = "SuryaCT1"

try{

if($web.availablecontenttypes[$ctypeName] -eq $null)

{

      $ctypeParent = $web.availablecontenttypes["Document"]

      $ctypeTest = new-object Microsoft.SharePoint.SPContentType($ctypeParent, $web.contenttypes, $ctypeName)

      ##group name

      $ctypeTest.Group = "Custom Group"

      $web.contenttypes.add($ctypeTest)

     

#     $ctypeTest = $web.ContentTypes[$ctypeName]

     

      Write-Host "ctypeAgenda" $ctypeTest.id

     

      ##Add fields to the ContentType

      $field = $web.fields.getfield("Field1")

     

      if($ctypeTest.Fields["Field1"] -eq $null)

      {

            $fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

            $ctypeTest.fieldlinks.add($fieldLink)

      }

     

      ##Update existing fields - as Required

      if($ctypeTest.Fields["Field2"] -ne $null)

      {

            $field = $ctypeTest.Fields["Field2"]

            $ctypeTest.FieldLinks[$field.Id].Required=$true

      }

       

     

      ##Delete fields from  ContentType

           

      if($ctypeTest.Fields["Field3"] -ne $null)

      {

         Write-Host "Field2"

        $field = $ctypeTest.Fields["Field3"]

        $fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

        $ctypeTest.FieldLinks.Delete($fieldLink.id);

      }

     

      ##create new field and then add to the ContentType

       

      $web.fields.add("SuryaField", "Text", $false)

      $field = $web.fields.getfield("SuryaField")

      $field.Group = "Custom Columns"

      $fieldLink = new-object Microsoft.SharePoint.SPFieldLink($field)

      $ctypeTest.fieldlinks.add($fieldLink)

      $ctypeTest.Update($true)

       

}

else

{

      Write-Host $ctypeTest " Contentype is already avilable in the site."

}

#$ctypeTest = $web.ContentTypes[$ctypeName]

## Add ContentType to the SharePoint List

      if($ctypeTest -ne $null)

            {

           

            $list =  $web.Lists.TryGetList("suryadocs")

           

            if($list.ContentTypesEnabled -eq $false   )

            {

            $list.ContentTypesEnabled = $true;

                  $list.Update()

            }

             

              if ($list.ContentTypes[$ctypeTest.Name] -eq $null)

             {

               $list.ContentTypes.Add($ctypeTest);

                   Write-Host $ctypeTest.name " ContentType added"

                   Sort-ContentTypes $list

             }

            }

}

catch

{

      Write-Host "Error occurred while Updating:"  $_  -ForegroundColor Red

}

Stop-SPAssignment –Global