In one of my recent projects I needed a generic service as a facade to handle General activities such as CRUD.Therefor I searched as Many as I could but there was no Idea on generic services so I tried to figure it out by my self.

Finally,I found a way :

Create a generic contract as below :

[ServiceContract]
public interface IEntityReadService<TEntity>
        where TEntity : EntityBase, new()
    {
        [OperationContract(Name = "Get")]
        TEntity Get(Int64 Id);
        [OperationContract(Name = "GetAll")]
        List<TEntity> GetAll();
        [OperationContract(Name = "GetAllPaged")]
        List<TEntity> GetAll(int pageSize, int currentPageIndex, ref int totalRecords);
        List<TEntity> GetAll(string whereClause, string orderBy, int pageSize, int currentPageIndex, ref int totalRecords);
      
    }

then create your service class :

  public class GenericService<TEntity> :IEntityReadService<TEntity>
	where TEntity : EntityBase, new()
{
#region Implementation of IEntityReadService<TEntity>
 
        public TEntity Get(long Id)
        {
            return BusinessController.Get(Id);
        }
 
 
 
        public List<TEntity> GetAll()
        {
            try
            {
                return BusinessController.GetAll().ToList();
            }
            catch (Exception ex)
            {
                
                throw;
            }
            
        }
 
        public List<TEntity> GetAll(int pageSize, int currentPageIndex, ref int totalRecords)
        {
            return
                BusinessController.GetAll(pageSize, currentPageIndex, ref totalRecords).ToList();
        }
 
        public List<TEntity> GetAll(string whereClause, string orderBy, int pageSize, int currentPageIndex, ref int totalRecords)
        {
            return
                BusinessController.GetAll(pageSize, currentPageIndex, ref totalRecords, whereClause, orderBy).ToList();
        }
 
 
        #endregion
}
Then, set your EndPoint configuration in this way :
<endpoint 
          address="myAddress" binding="basicHttpBinding" 
          bindingConfiguration="myBindingConfiguration1"
          contract="Contracts.IEntityReadService`1[[Entities.mySampleEntity, Entities]], Service.Contracts"  />