DPDP02_g5.cs

public abstract class RepositoryBase<T> : IRepository<T> where T : Entity
{
    protected Dyn365ServiceContext ServiceContext;
    protected IOrganizationService OrgService;

    public RepositoryBase(IOrganizationService service)
    {
        this.OrgService = service; 
        this.ServiceContext = new Dyn365ServiceContext(service);
    }

    public void Create(T entity)
    {
        this.ServiceContext.AddObject(entity);
    }

    public T GetById(Guid id)
    {
        var entityName = typeof(T).Name; 
        return this.OrgService.Retrieve(entityName, id, new Microsoft.Xrm.Sdk.Query.ColumnSet(true)).ToEntity<T>(); 
    }

    public void SaveChanges()
    {
        this.ServiceContext.SaveChanges();
    }

    public void Dispose()
    {
        ServiceContext.Dispose();
    }
}