Question

I create a generic method:

private void UpdateAllProperties<idType, entityType>(entityType currentEntity, entityType newEntity)
    where idType : IEquatable<idType>
    where entityType : AbstractEntity<idType>
{
    var currentEntityProperties = currentEntity.GetType().GetProperties();
    var newEntityProperties = newEntity.GetType().GetProperties();

    foreach (var currentEntityProperty in currentEntityProperties)
    {
        foreach (var newEntityProperty in newEntityProperties)
        {
            if (newEntityProperty.Name == currentEntityProperty.Name)
            {
                if (currentEntityProperty.PropertyType == typeof(AbstractEntity<>))
                {
                    // Here i want to use this method again, but i need to inform the types.. how can i do anything like that:
                    var idPropertyType = currentEntityProperty.PropertyType.GetProperty("Id").GetType();
                    var entityPropertyType = currentEntityProperty.PropertyType;

                    // Here i got the error because i cannot set through this way
                    this.UpdateAllProperties<idPropertyType, entityPropertyType>(currentEntityProperty.GetValue(currentEntity, null), newEntityProperty.GetValue(newEntity, null));

                    break;
                }
                else if (currentEntityProperty.PropertyType == typeof(ICollection<>))
                {
                    // TODO

                    break;
                }
                else
                {
                    currentEntityProperty.SetValue(currentEntity, newEntityProperty.GetValue(newEntity, null), null);

                    break;
                }
            }
        }
    }
}

How can i do this?

Answer 1

You will have to make the call using Type.GetMethod() to get the method and MethodInfo.MakeGenericMethod() to set it up with the right types, before using MethodInfo.Invoke() to call the method.

Something like:

var idPropertyType = currentEntityProperty.PropertyType.GetProperty("Id").PropertyType;
var entityPropertyType = currentEntityProperty.PropertyType;

var method = this.GetType().GetMethod("UpdateAllProperties", 
                              BindingFlags.Instance | BindingFlags.NonPublic);
var genericMethod = method.MakeGenericMethod(idPropertyType, entityPropertyType);
genericMethod.Invoke(this, new[] { 
    currentEntityProperty.GetValue(currentEntity, null),   
    newEntityProperty.GetValue(newEntity, null)
});