diff --git a/CC.Yi.API/Controllers/StudentController.cs b/CC.Yi.API/Controllers/StudentController.cs
new file mode 100644
index 00000000..5411f596
--- /dev/null
+++ b/CC.Yi.API/Controllers/StudentController.cs
@@ -0,0 +1,30 @@
+using CC.Yi.IBLL;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace CC.Yi.API.Controllers
+{
+    [ApiController]
+    [Route("[controller]/[action]")]
+    public class StudentController : ControllerBase
+    {
+        private readonly ILogger<StudentController> _logger;
+        private IstudentBll _studentBll;
+        public StudentController(ILogger<StudentController> logger, IstudentBll studentBll)
+        {
+            _studentBll = studentBll;
+            _logger = logger;
+        }
+
+        [HttpGet]
+        public IActionResult Test()
+        {
+            var data = _studentBll.GetAllEntities().ToList();
+            return Content(Common.JsonFactory.JsonToString(data));
+        }
+    }
+}
diff --git a/CC.Yi.API/Controllers/WeatherForecastController.cs b/CC.Yi.API/Controllers/WeatherForecastController.cs
deleted file mode 100644
index 6ba2ecff..00000000
--- a/CC.Yi.API/Controllers/WeatherForecastController.cs
+++ /dev/null
@@ -1,47 +0,0 @@
-using CC.Yi.IBLL;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.Extensions.Logging;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace CC.Yi.API.Controllers
-{
-    [ApiController]
-    [Route("[controller]/[action]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-        private IstudentBll _studentBll;
-        public WeatherForecastController(ILogger<WeatherForecastController> logger, IstudentBll studentBll)
-        {
-            _studentBll = studentBll;
-            _logger = logger;
-        }
-
-        [HttpGet]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            var rng = new Random();
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateTime.Now.AddDays(index),
-                TemperatureC = rng.Next(-20, 55),
-                Summary = Summaries[rng.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-        [HttpGet]
-        public IActionResult Test()
-        {
-           var data= _studentBll.GetEntities(n => n.id >= 0).ToList();
-            return Content(Common.JsonFactory.JsonToString(data));
-        }
-    }
-}
diff --git a/CC.Yi.API/WeatherForecast.cs b/CC.Yi.API/WeatherForecast.cs
deleted file mode 100644
index 9a3c14cf..00000000
--- a/CC.Yi.API/WeatherForecast.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-
-namespace CC.Yi.API
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string Summary { get; set; }
-    }
-}
diff --git a/CC.Yi.BLL/BaseBll.cs b/CC.Yi.BLL/BaseBll.cs
index 6ebbd6f4..5e7a1a4f 100644
--- a/CC.Yi.BLL/BaseBll.cs
+++ b/CC.Yi.BLL/BaseBll.cs
@@ -15,11 +15,10 @@ namespace CC.Yi.BLL
         {
             CurrentDal = cd;
         }
-        //public abstract void SetCurrentDal();
-        //public BaseBll()//基类的构造方法
-        //{
-        //    SetCurrentDal();//该方法由子类去实现
-        //}
+        public IQueryable<T> GetAllEntities() 
+        {
+            return CurrentDal.GetAllEntities();
+        }
 
         public IQueryable<T> GetEntities(Expression<Func<T, bool>> whereLambda)
         {
diff --git a/CC.Yi.DAL/BaseDal.cs b/CC.Yi.DAL/BaseDal.cs
index fc85f109..70e00edd 100644
--- a/CC.Yi.DAL/BaseDal.cs
+++ b/CC.Yi.DAL/BaseDal.cs
@@ -19,7 +19,13 @@ namespace CC.Yi.DAL
             return Db.Set<T>().Where(whereLambda).AsQueryable();
         }
 
-        public int GetCount(Expression<Func<T, bool>> whereLambda) //统计数量
+        public IQueryable<T> GetAllEntities()
+        {
+            return Db.Set<T>().AsQueryable();
+        }
+
+
+        public int GetCount(Expression<Func<T, bool>> whereLambda)
         {
             return Db.Set<T>().Where(whereLambda).Count();
         }
diff --git a/CC.Yi.IBLL/IBaseBll.cs b/CC.Yi.IBLL/IBaseBll.cs
index adc03e26..dae45507 100644
--- a/CC.Yi.IBLL/IBaseBll.cs
+++ b/CC.Yi.IBLL/IBaseBll.cs
@@ -7,23 +7,53 @@ namespace CC.Yi.IBLL
 {
     public interface IBaseBll<T> where T : class, new()
     {
+        #region
+        //得到全部实体
+        #endregion
+        IQueryable<T> GetAllEntities();
+        #region
+        //通过表达式得到实体
+        #endregion
         IQueryable<T> GetEntities(Expression<Func<T, bool>> whereLambda);
 
-        int GetCount(Expression<Func<T, bool>> whereLambda);//统计数量
+        #region
+        //通过表达式得到实体，分页版本
+        #endregion
+        IQueryable<T> GetPageEntities<S>(int pageSize, int pageIndex, out int total, Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> orderByLambda, bool isAsc);
+       
+        #region
+        //通过表达式统计数量
+        #endregion
+        int GetCount(Expression<Func<T, bool>> whereLambda);
 
         #region
-        //分组
+        //通过表达式分组
         #endregion
         IQueryable<IGrouping<S, T>> GetGroup<S>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> groupByLambda);
 
-        IQueryable<T> GetPageEntities<S>(int pageSize, int pageIndex, out int total, Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> orderByLambda, bool isAsc);
-
+        #region
+        //添加实体
+        #endregion
         T Add(T entity);
 
+        #region
+        //更新实体
+        #endregion
         bool Update(T entity);
 
+        #region
+        //删除实体
+        #endregion
         bool Delete(T entity);
+
+        #region
+        //通过id删除实体
+        #endregion
         bool Delete(int id);
+
+        #region
+        //通过id列表删除多个实体
+        #endregion
         int DeleteList(List<int> ids);
     }
 }
diff --git a/CC.Yi.IDAL/IBaseDal.cs b/CC.Yi.IDAL/IBaseDal.cs
index 09719777..a7b2d0cd 100644
--- a/CC.Yi.IDAL/IBaseDal.cs
+++ b/CC.Yi.IDAL/IBaseDal.cs
@@ -6,44 +6,48 @@ namespace CC.Yi.IDAL
 {
     public interface IBaseDal<T> where T : class, new()
     {
+        #region
+        //得到全部实体
+        #endregion
+        IQueryable<T> GetAllEntities();
+
         #region
         //通过表达式得到实体
         #endregion
         IQueryable<T> GetEntities(Expression<Func<T, bool>> whereLambda);
 
         #region
-        //统计数量
-        #endregion
-        int GetCount(Expression<Func<T, bool>> whereLambda);//统计数量
-
-        #region
-        //分组
-        #endregion
-        IQueryable<IGrouping<S, T>> GetGroup<S>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> groupByLambda);
-
-
-        #region
-        //通过得到实体，分页版本
+        //通过表达式得到实体，分页版本
         #endregion
         IQueryable<T> GetPageEntities<S>(int pageSize, int pageIndex, out int total, Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> orderByLambda, bool isAsc);
 
         #region
-        //添加实体
+        //通过表达式统计数量
+        #endregion
+        int GetCount(Expression<Func<T, bool>> whereLambda);
+
+        #region
+        //通过表达式分组
+        #endregion
+        IQueryable<IGrouping<S, T>> GetGroup<S>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, S>> groupByLambda);
+
+        #region
+        //添加单个实体
         #endregion
         T Add(T entity);
 
         #region
-        //更新实体
+        //更新单个实体
         #endregion
         bool Update(T entity);
 
         #region
-        //删除实体
+        //删除单个实体
         #endregion
         bool Delete(T entity);
 
         #region
-        //通过id进行删除实体
+        //通过id删除实体
         #endregion
         bool Detete(int id);
     }