diff --git "a/\350\256\270\346\242\246\345\251\267/2021-6-22.md" "b/\350\256\270\346\242\246\345\251\267/2021-6-22.md"
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@@ -0,0 +1,9 @@
+
+今日份课堂笔记
+
+2021-6-22 星期二
+创建解决方案：dotnet new sln
+
+将项目添加到解决方案：dotnet sln add MyApi.Api
+
+运行：dotnet run
diff --git "a/\350\256\270\346\242\246\345\251\267/2021-6-23.md" "b/\350\256\270\346\242\246\345\251\267/2021-6-23.md"
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@@ -0,0 +1,212 @@
+今日份课堂笔记
+
+2021-6-23 星期三
+
+1.创建解决方案：dotnet new sln
+
+2.创建webapi文件：dotnet new webapi -n Admin3000.Backend.Api --no-https 
+
+3.不进入文件夹进行运行:dotnet run -p Admin3000.Backend.Api （如果进入文件夹可直接 dotnet run）
+
+4.将项目添加到解决方案中：dotnet sln add Admin3000.Backend.Api
+
+5.下载以下插件
+
+![avater](./imgs/2021-6-23-001.PNG)
+![avater](./imgs/2021-6-23-002.PNG)
+![avater](./imgs/2021-6-23-003.PNG)
+
+```
+api.http中：
+
+###
+GET http://localhost:5000/users HTTP/1.1
+
+UsersController.cs中：
+
+using Microsoft.AspNetCore.Mvc;
+namespace Admin300.Backend.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class UsersController : ControllerBase
+    {
+        [HttpGet]
+       public dynamic Get()
+       {
+        return"恭喜发财";
+      }
+    }
+}
+```
+结果如图：
+
+![avater](./imgs/2021-6-23-004.PNG)
+
+```
+api.http中：
+
+###
+GET http://localhost:5000/users HTTP/1.1
+
+Entity文件夹中Users.cs：
+
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    public class Users
+    {
+        public Users(){
+            CreatedTime=DateTime.Now;
+            UpdatedTime=DateTime.Now;
+            Remarks="";
+        }
+        public int Id {get;set;}
+        public string Username {get;set;}
+        public string Password{get;set;}
+        public DateTime CreatedTime{get;set;}
+        public DateTime UpdatedTime{get;set;}
+         public string Remarks{get;set;}
+    }
+}
+```
+结果如图：
+
+![avater](./imgs/2021-6-23-005.PNG)
+
+<h2>增删改查</h2>
+
+
+UsersController.cs中：
+```
+using Microsoft.AspNetCore.Mvc;
+using System.Collections.Generic;
+using Admin3000.Backend.Api.Entity;
+using System.Linq;
+
+
+namespace Admin300.Backend.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class UsersController : ControllerBase
+    {
+        [HttpGet]
+        public dynamic Get()
+        {
+            var users = GetUsers();
+            return users;
+        }
+        [HttpGet("{id}")]
+        public dynamic Get(int id)
+        {
+            var users = GetUsers();
+            var user = users.Where(x => x.Id == id).FirstOrDefault();
+            return user;
+        }
+        [HttpPost]
+        public dynamic Post(dynamic model)
+        {
+
+            return new
+            {
+                Code = 1000,
+                Data = model,
+                Msg = "创建用户成功"
+            };
+        }
+        [HttpPut("{id}")]
+        public dynamic put(int id, dynamic model)
+        {
+            return new
+            {
+                Code = 1000,
+                Data = model,
+                Msg = string.Format("你修改的用户id为:{0}，已经成功", id)
+            };
+        }
+        [HttpDelete("{id}")]
+        public dynamic Delete(int id)
+        {
+            return new
+            {
+                Code = 1000,
+                Msg = string.Format("删除指定id为：{0}的用户已经成功", id)
+            };
+        }
+        private IEnumerable<Users> GetUsers()
+        {
+            var users = new List<Users>{
+           new Users{
+               Id=1,
+               Username="小明",
+               Password="123"
+           },   new Users{
+               Id=2,
+               Username="小王",
+               Password="123"
+           },   new Users{
+               Id=3,
+               Username="小李",
+               Password="123"
+           },
+       };
+            return users;
+        }
+    }
+}
+```
+api.http中：
+
+```
+###获取用户列表
+GET http://localhost:5000/users HTTP/1.1
+
+###获取指定ID的用户
+GET http://localhost:5000/users/3 HTTP/1.1
+
+###创建用户
+POST http://localhost:5000/users HTTP/1.1
+Content-Type: application/json
+
+{
+    "username":"小林",
+    "password":"222"
+}
+
+###修改指定用户
+
+PUT  http://localhost:5000/users/1 HTTP/1.1
+Content-Type: application/json
+
+{
+    "username":"小林",
+    "password":"222"
+}
+
+###删除指定用户
+DELETE  http://localhost:5000/users/1 HTTP/1.1
+```
+
+users.cs中：
+
+```
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    public class Users
+    {
+        public Users(){
+            CreatedTime=DateTime.Now;
+            UpdatedTime=DateTime.Now;
+            Remarks="";
+        }
+        public int Id {get;set;}
+        public string Username {get;set;}
+        public string Password{get;set;}
+        public DateTime CreatedTime{get;set;}
+        public DateTime UpdatedTime{get;set;}
+         public string Remarks{get;set;}
+    }
+}
+```
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diff --git "a/\350\256\270\346\242\246\345\251\267/2021-6-26.md" "b/\350\256\270\346\242\246\345\251\267/2021-6-26.md"
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+今日份课堂笔记
+
+2021-6-26 星期六
+
+<h1>EF Core</h1>
+
+```
+//配置时具有路径
+ protected override void OnConfiguring(DbContextOptionsBuilder options)
+ => options.UseSqlite(@"Data Source=C:\blogging.db");
+```
+<h2>安装 Entity Framework Core</h2>
+
+dotnet add package Microsoft.EntityFrameworkCore.Sqlserver
+
+<h2>创建数据库</h2>
+
+dotnet tool install --global dotnet-ef
+dotnet add package Microsoft.EntityFrameworkCore.Design
+
+<h2>添加实体</h2>
+
+dotnet ef migrations add 添加一个用户实体
\ No newline at end of file
diff --git "a/\350\256\270\346\242\246\345\251\267/2021-6-29.md" "b/\350\256\270\346\242\246\345\251\267/2021-6-29.md"
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@@ -0,0 +1,71 @@
+今日份课堂笔记
+
+2021-6-29 星期二
+
+```
+dotnet ef database update更新
+```
+<h1>重新抽象了实体的共有属性</h1>
+
+BaseEntity.cs中：
+```
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    //abstract只能被继承，不能被初始化
+    public abstract class BaseEntity
+    {
+        public int Id {get;set;}
+        public bool IsActived { get; set;}
+        public bool IsDeleted { get; set;}
+        public DateTime CreateTime{ get; set;}
+        public int DisplayOrder{ get; set;}
+        public String Remarks{ get; set;}
+        public DateTime UpdatedTime{ get; set;} 
+          }
+}
+```
+Roles.cs中：
+```
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    public class Roles:BaseEntity{    
+        public string RoleName{ get; set;}
+    }
+}
+```
+UserRoles.cs中：
+```
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    public class UserRoles:BaseEntity{
+        public string UserId{ get; set;}
+        public string RoleId{ get; set;}
+    }
+}
+```
+Users.cs中：
+```
+using System;
+namespace Admin3000.Backend.Api.Entity
+{
+    public class Users:BaseEntity{
+        public string Username{ get ; set;}
+        public string Password { get; set;}
+    }
+}
+```
+<h1>尝试让其建立主外键关系</h1>
+
+```
+Users.cs和Roles.cs中添加：
+public virtual IEnumerable<UserRoles> UserRoles { get; set; }
+
+UserRoles中添加：
+public virtual Users User{get;set;}
+public virtual Roles Role{get;set;}
+```
+
+![avater](./imgs/2021-6-29-001.PNG)
\ No newline at end of file
diff --git "a/\350\256\270\346\242\246\345\251\267/2021-7-02.md" "b/\350\256\270\346\242\246\345\251\267/2021-7-02.md"
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@@ -0,0 +1,3 @@
+今日份课堂笔记
+
+2021-7-2 星期五
\ No newline at end of file
diff --git "a/\350\256\270\346\242\246\345\251\267/2021-7-03.md" "b/\350\256\270\346\242\246\345\251\267/2021-7-03.md"
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+今日份课堂笔记
+
+2021-7-3 星期六
+![avater](./imgs/2021-7-3-001.PNG)
+![avater](./imgs/2021-7-3-002.PNG)
+![avater](./imgs/2021-7-3-003.PNG)
\ No newline at end of file
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