Mapping business Objects and Entity Object with reflection c#

.net c#-3.0 c#-4.0 entity-framework

Question

I want to somehow map entity object to business object using reflection in c# -

public class Category
    {
        public int CategoryID { get; set; }
        public string CategoryName { get; set; }
    }

My Entity Class has same properties, CategoryId and CategoryName.Any best practice using reflection or dynamic would be appreciated.

1
2
3/8/2011 5:10:16 PM

Accepted Answer

You can use Automapper or Valueinjecter

Edit:

Ok I wrote a function that uses reflection, beware it is not gonna handle cases where mapped properties aren't exactly equal e.g IList won't map with List

public static void MapObjects(object source, object destination)
{
    Type sourcetype = source.GetType();
    Type destinationtype = destination.GetType();

    var sourceProperties = sourcetype.GetProperties();
    var destionationProperties = destinationtype.GetProperties();

    var commonproperties = from sp in sourceProperties
                           join dp in destionationProperties on new {sp.Name, sp.PropertyType} equals
                               new {dp.Name, dp.PropertyType}
                           select new {sp, dp};

    foreach (var match in commonproperties)
    {
        match.dp.SetValue(destination, match.sp.GetValue(source, null), null);                   
    }            
}
16
4/2/2017 4:30:59 PM

Popular Answer

This is something that I wrote to do what I think you are trying to do and you don't have to cast your business objects:

public static TEntity ConvertObjectToEntity<TEntity>(object objectToConvert, TEntity entity) where TEntity : class
    {
        if (objectToConvert == null || entity == null)
        {
            return null;
        }

        Type BusinessObjectType = entity.GetType();
        PropertyInfo[] BusinessPropList = BusinessObjectType.GetProperties();

        Type EntityObjectType = objectToConvert.GetType();
        PropertyInfo[] EntityPropList = EntityObjectType.GetProperties();

        foreach (PropertyInfo businessPropInfo in BusinessPropList)
        {
            foreach (PropertyInfo entityPropInfo in EntityPropList)
            {
                if (entityPropInfo.Name == businessPropInfo.Name && !entityPropInfo.GetGetMethod().IsVirtual && !businessPropInfo.GetGetMethod().IsVirtual)
                {
                    businessPropInfo.SetValue(entity, entityPropInfo.GetValue(objectToConvert, null), null);
                    break;
                }
            }
        }

        return entity;
    }

Usage example:

public static Category GetCategory(int id)
    {
        return ConvertObjectToEntity(Database.GetCategoryEntity(id), new Category());
    }


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