Entity Framework自用的DataBase基类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Model;
using System.Data.Objects.DataClasses;

namespace Work
{
    public class DataBase<T> where T : EntityObject
    {
        protected OfficeAnywhereEntities entities = new OfficeAnywhereEntities();

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public bool Add(T t)
        {
            entities.AddObject(typeof(T).Name, t);
            return SaveChanges() > 0;
        }

        /// <summary>
        /// 执行
        /// </summary>
        /// <returns></returns>
        private int SaveChanges()
        {
            try
            {
                return entities.SaveChanges();
            }
            catch (Exception e)
            {
                throw e.InnerException;
            }
            
        }

        /// <summary>
        /// 寻找对象
        /// </summary>
        /// <param name="Guid"></param>
        /// <returns></returns>
        private T FindByGuid(string Guid)
        {
            T t = null;
            entities.CreateObjectSet<T>().ToList().ForEach(p => {
                if (p.EntityKey.EntityKeyValues[0].Value.ToString() == Guid)
                    t = p;
            });
            return t;
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="Guid"></param>
        /// <returns></returns>
        public bool DelByGuid(string Guid)
        {
            T t = FindByGuid(Guid);
            if(t!=null)
            entities.DeleteObject(t);
            return SaveChanges() > 0;
        }

        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="Guid"></param>
        /// <param name="act"></param>
        /// <returns></returns>
        public bool UpdateByGuid(string Guid, Action<T> act)
        {
            T t = FindByGuid(Guid);
            act(t);
            return SaveChanges() > 0;
        }

        /// <summary>
        /// 列表
        /// </summary>
        /// <returns></returns>
        public List<T> GetList()
        {
            return entities.CreateObjectSet<T>().ToList();
        }
    }
}