DefinedValueByDescriptionFieldType

using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;

using Rock;
using Rock.Field.Types;
using Rock.Web.Cache;

namespace org.rockchurch.SampleProject.Field.Types
{
    class DefinedValueByDescriptionFieldType : DefinedValueFieldType
    {
        public override string FormatValue( System.Web.UI.Control parentControl, string value, Dictionary<string, Rock.Field.ConfigurationValue> configurationValues, bool condensed )
        {
            string formattedValue = string.Empty;

            if ( !string.IsNullOrWhiteSpace( value ) )
            {
                var names = new List<string>();
                foreach ( string guidValue in value.Split( new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries ) )
                {
                    var definedValue = Rock.Web.Cache.DefinedValueCache.Read( guidValue.AsGuid() );
                    if ( definedValue != null )
                    {
                        names.Add( condensed ? definedValue.Value : definedValue.Description );
                    }
                }

                formattedValue = names.AsDelimited( ", " );
            }

            return formattedValue;
        }

        public override System.Web.UI.Control EditControl( Dictionary<string, Rock.Field.ConfigurationValue> configurationValues, string id )
        {
            var listControl = base.EditControl( configurationValues, id ) as ListControl;
            if ( listControl != null )
            {
                foreach ( ListItem listItem in listControl.Items )
                {
                    var definedValue = DefinedValueCache.Read( listItem.Value.AsInteger() );
                    if ( definedValue != null )
                    {
                        listItem.Text = definedValue.Description;
                    }
                }
            }

            return listControl;
        }
    }
}