EF6 简单增删改查示例代码

示例一：

private DbContext _dbContext;
       public DbContext CurrentContext
       {
           get
           {
               if (_dbContext == null)
               {
                   _dbContext = new TransitContext();
               }
               return _dbContext;
           }
       }  

       /// <summary>
       /// 执行Sql查询
       /// </summary>
       /// <typeparam name="TEntity"></typeparam>
       /// <param name="strSql"></param>
       /// <param name="paramObjects"></param>
       /// <returns></returns>
       public List<TEntity> SqlQuery<TEntity>(string strSql, params Object[] paramObjects) where TEntity : class
       {
           if (paramObjects == null)
           {
               paramObjects = new object[0];
           }
           return this.CurrentContext.Database.SqlQuery<TEntity>(strSql, paramObjects).ToList();
       }  

       /// <summary>
       /// 查询
       /// </summary>
       /// <param name="predicate"></param>
       /// <returns></returns>
       public IQueryable<TEntity> Search<TEntity>(Expression<Func<TEntity, bool>> predicate) where TEntity : class
       {
           return CurrentContext.Set<TEntity>().Where(predicate);
       }  

       /// <summary>
       /// 查询全部
       /// </summary>
       /// <returns></returns>
       public IQueryable<TEntity> FindAll<TEntity>() where TEntity : class
       {
           return CurrentContext.Set<TEntity>();
       }  

       /// <summary>
       /// 插入
       /// </summary>
       /// <param name="entity"></param>
       /// <param name="isSave"></param>
       public void Insert<TEntity>(TEntity entity, bool isSave = true) where TEntity : class
       {
           CurrentContext.Set<TEntity>().Add(entity);
           if (isSave)
           {
               CurrentContext.SaveChanges();
           }
       }  

       /// <summary>
       /// 批量插入
       /// </summary>
       /// <param name="entitys"></param>
       /// <param name="isSave"></param>
       public void Insert<TEntity>(List<TEntity> entitys, bool isSave = true) where TEntity : class
       {
           foreach (var entity in entitys)
           {
               CurrentContext.Set<TEntity>().Add(entity);
           }
           if (isSave)
           {
               CurrentContext.SaveChanges();
           }
       }  

       /// <summary>
       /// 更新
       /// </summary>
       /// <param name="entity"></param>
       /// <param name="isSave"></param>
       public void Update<TEntity>(TEntity entity, bool isSave = true) where TEntity : class
       {
           var local = FindLocal(CurrentContext, entity);
           if (local == null)
           {
               throw new Exception("要更新的实体不存在");
           }
           ObjectMapper.CopyProperties(entity, local);
           if (isSave)
           {
               CurrentContext.SaveChanges();
           }
       }  

       /// <summary>
       /// 批量更新
       /// </summary>
       /// <param name="entities"></param>
       /// <param name="isSave"></param>
       public void Update<TEntity>(List<TEntity> entities, bool isSave = true) where TEntity : class
       {
           foreach (var entity in entities)
           {
               var local = FindLocal(CurrentContext, entity);
               if (local == null)
               {
                   throw new Exception("要更新的实体不存在");
               }
               ObjectMapper.CopyProperties(entity, local);
           }
           if (isSave)
           {
               CurrentContext.SaveChanges();
           }
       }  

       /// <summary>
       /// 删除
       /// </summary>
       /// <param name="entity"></param>
       /// <param name="isSave"></param>
       public void Delete<TEntity>(TEntity entity, bool isSave = true) where TEntity : class
       {
           var local = FindLocal(CurrentContext, entity);
           if (local == null)
           {
               throw new Exception("要删除的实体不存在");
           }
           CurrentContext.Entry<TEntity>(local).State = EntityState.Deleted;
           if (isSave)
           {
               CurrentContext.SaveChanges();
           }
       }

　　

示例二：