Example output for Stack Overflow question: How to simplify repeating if-then-assign construction? - http://stackoverflow.com/a/29918452/7586

Mapping.generated.cs

  
// !!!
// !!!  Do not modify this file, it is automatically generated. Change the .tt file instead.     !!!
// !!!
namespace Your.Mapper
{
    partial class Mapper
    {
        /// <summary>
        /// Set <paramref name="target"/> properties by copying them from <paramref name="source"/>.
        /// </summary>
        /// <remarks>Mapping:<br/>
        /// <see cref="ConsoleApplicationT4So29913514.Student.Title"/> → <see cref="ConsoleApplicationT4So29913514.StudentRecord.EntityTitle"/> <br/>
        /// <see cref="ConsoleApplicationT4So29913514.Student.StudentId"/> → <see cref="ConsoleApplicationT4So29913514.StudentRecord.Id"/> <br/>
        /// <see cref="ConsoleApplicationT4So29913514.Student.Name"/> → <see cref="ConsoleApplicationT4So29913514.StudentRecord.Name"/> <br/>
        /// <see cref="ConsoleApplicationT4So29913514.Student.LuckyNumber"/> → <see cref="ConsoleApplicationT4So29913514.StudentRecord.LuckyNumber"/> <br/>
        /// </remarks>
        /// <returns><c>true</c> if any property was changed, <c>false</c> if all properties were the same.</returns>
        public bool ModifyExistingEntity(ConsoleApplicationT4So29913514.Student source, ConsoleApplicationT4So29913514.StudentRecord target)
        {
            bool dirty = false;
            if (target.EntityTitle != source.Title)
            {
                dirty = true;
                target.EntityTitle = source.Title;
            }           
            if (target.Id != source.StudentId)
            {
                dirty = true;
                target.Id = source.StudentId;
            }           
            if (target.Name != source.Name)
            {
                dirty = true;
                target.Name = source.Name;
            }           
            if (target.LuckyNumber != source.LuckyNumber)
            {
                dirty = true;
                target.LuckyNumber = source.LuckyNumber;
            }           
            return dirty;
        }
        /// <summary>
        /// Set <paramref name="target"/> properties by copying them from <paramref name="source"/>.
        /// </summary>
        /// <remarks>Mapping:<br/>
        /// <see cref="ConsoleApplicationT4So29913514.Car.Color"/> → <see cref="ConsoleApplicationT4So29913514.RaceCar.Color"/> <br/>
        /// <see cref="ConsoleApplicationT4So29913514.Car.Driver"/> → <see cref="ConsoleApplicationT4So29913514.RaceCar.Driver"/> <br/>
        /// <see cref="ConsoleApplicationT4So29913514.Car.Driver.Length"/> → <see cref="ConsoleApplicationT4So29913514.RaceCar.DriverNameDisplayWidth"/> <br/>
        /// </remarks>
        /// <returns><c>true</c> if any property was changed, <c>false</c> if all properties were the same.</returns>
        public bool ModifyExistingEntity(ConsoleApplicationT4So29913514.Car source, ConsoleApplicationT4So29913514.RaceCar target)
        {
            bool dirty = false;
            if (target.Color != source.Color)
            {
                dirty = true;
                target.Color = source.Color;
            }           
            if (target.Driver != source.Driver)
            {
                dirty = true;
                target.Driver = source.Driver;
            }           
            if (target.DriverNameDisplayWidth != source.Driver.Length)
            {
                dirty = true;
                target.DriverNameDisplayWidth = source.Driver.Length;
            }           
            return dirty;
        }
        
    }
}