functions/SPClientField/Convert-SPClientField.ps1

#Requires -Version 3.0

# Convert-SPClientField.ps1
#
# Copyright (c) 2017 karamem0
#
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.

function Convert-SPClientField {

<#
.SYNOPSIS
.PARAMETER ClientContext
  Indicates the client context.
  If not specified, uses the default context.
.PARAMETER ClientObject
  Indicates the field.
#>


    [CmdletBinding()]
    param (
        [Parameter(Mandatory = $false)]
        [Microsoft.SharePoint.Client.ClientContext]
        $ClientContext = $SPClient.ClientContext,
        [Parameter(Mandatory = $false, ValueFromPipeline = $true)]
        [Microsoft.SharePoint.Client.Field]
        $ClientObject
    )

    process {
        if ($ClientContext -eq $null) {
            throw "Cannot bind argument to parameter 'ClientContext' because it is null."
        }
        $Table = @{
            Text = 'Microsoft.SharePoint.Client.FieldText'
            Note = 'Microsoft.SharePoint.Client.FieldMultilineText'
            Choice = 'Microsoft.SharePoint.Client.FieldChoice'
            MultiChoice = 'Microsoft.SharePoint.Client.FieldMultiChoice'
            Number = 'Microsoft.SharePoint.Client.FieldNumber'
            Currency = 'Microsoft.SharePoint.Client.FieldCurrency'
            DateTime = 'Microsoft.SharePoint.Client.FieldDateTime'
            Lookup = 'Microsoft.SharePoint.Client.FieldLookup'
            LookupMulti = 'Microsoft.SharePoint.Client.FieldLookup'
            Boolean = 'Microsoft.SharePoint.Client.FieldNumber'
            User = 'Microsoft.SharePoint.Client.FieldUser'
            UserMulti = 'Microsoft.SharePoint.Client.FieldUser'
            Url = 'Microsoft.SharePoint.Client.FieldUrl'
            Calculated = 'Microsoft.SharePoint.Client.FieldCalculated'
        }
        $Method = $ClientContext.GetType().GetMethod('CastTo')
        $Method = $Method.MakeGenericMethod([type[]]$Table[$ClientObject.TypeAsString])
        Write-Output $Method.Invoke($ClientContext, @($ClientObject))
    }

}