diff --git a/Study.DelegateSeries.Core/Calculator/Addition.cs b/Study.DelegateSeries.Core/Calculator/Addition.cs
new file mode 100644
index 0000000..8fdeaea
--- /dev/null
+++ b/Study.DelegateSeries.Core/Calculator/Addition.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core.Calculator
+{
+    /// <summary>
+    /// 加法类
+    /// </summary>
+    public class Addition
+    {
+        /// <summary>
+        /// 求两个数的和
+        /// </summary>
+        public decimal Add(decimal first,decimal second)
+        {
+            return first + second;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Calculator/Division.cs b/Study.DelegateSeries.Core/Calculator/Division.cs
new file mode 100644
index 0000000..8e72b22
--- /dev/null
+++ b/Study.DelegateSeries.Core/Calculator/Division.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core.Calculator
+{
+    /// <summary>
+    /// 除法类
+    /// </summary>
+    public class Division
+    {
+        /// <summary>
+        /// 求商
+        /// </summary>
+        /// <param name="dividend">被除数</param>
+        /// <param name="divisor">除数</param>
+        /// <returns>商</returns>
+        public decimal af(decimal dividend, decimal divisor)
+        {
+            return dividend / divisor;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Calculator/Multiplication.cs b/Study.DelegateSeries.Core/Calculator/Multiplication.cs
new file mode 100644
index 0000000..6ae2272
--- /dev/null
+++ b/Study.DelegateSeries.Core/Calculator/Multiplication.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core.Calculator
+{
+    /// <summary>
+    /// 乘法类
+    /// </summary>
+    public class Multiplication
+    {
+        /// <summary>
+        /// 求积
+        /// </summary>
+        /// <param name="factorA">因数A</param>
+        /// <param name="factorB">因数B</param>
+        /// <returns>积</returns>
+        public decimal Multiplicat(decimal factorA,decimal factorB)
+        {
+            return factorA * factorB;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Calculator/Subtraction.cs b/Study.DelegateSeries.Core/Calculator/Subtraction.cs
new file mode 100644
index 0000000..4da09f7
--- /dev/null
+++ b/Study.DelegateSeries.Core/Calculator/Subtraction.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core.Calculator
+{
+    /// <summary>
+    /// 减法类
+    /// </summary>
+    public class Subtraction
+    {
+        /// <summary>
+        /// 求差
+        /// </summary>
+        /// <param name="minuend">被减数</param>
+        /// <param name="subtractor">减数</param>
+        /// <returns>差</returns>
+        public decimal Difference(decimal minuend, decimal subtractor)
+        {
+            return minuend - subtractor;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Demo.cs b/Study.DelegateSeries.Core/Demo.cs
new file mode 100644
index 0000000..4f7bde7
--- /dev/null
+++ b/Study.DelegateSeries.Core/Demo.cs
@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core
+{
+    public delegate int mydelegate();
+    public class Demo
+    {
+        
+        public int MyDemo(int b)
+        {
+            return b * b;
+        }
+
+        public int UseDelegate()
+        {
+            mydelegate d = delegate () { return 5; };
+
+            var total = MyDemo(d());
+
+            return total;
+        }
+
+        private void aa()
+        {
+
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Person/Student.cs b/Study.DelegateSeries.Core/Person/Student.cs
new file mode 100644
index 0000000..f6b4076
--- /dev/null
+++ b/Study.DelegateSeries.Core/Person/Student.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core
+{
+    /// <summary>
+    /// 学生类
+    /// </summary>
+    public class Student
+    {
+        public int Id { get; set; }
+        
+        public string Name { get; set; }
+
+        public static string ShowTypeName()
+        {
+            return typeof(Student).FullName;
+        }
+
+        public string ShowStudentName()
+        {
+            return this.Name;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Person/Teacher.cs b/Study.DelegateSeries.Core/Person/Teacher.cs
new file mode 100644
index 0000000..fa0d3d7
--- /dev/null
+++ b/Study.DelegateSeries.Core/Person/Teacher.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Study.DelegateSeries.Core
+{
+    /// <summary>
+    /// 老师类
+    /// </summary>
+    public class Teacher
+    {
+        public int Id { get; set; }
+
+        public string Name { get; set; }
+
+        public static string ShowTypeName()
+        {
+            return typeof(Teacher).FullName;
+        }
+
+        public string ShowTeacherName()
+        {
+            return this.Name;
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Core/Study.DelegateSeries.Core.csproj b/Study.DelegateSeries.Core/Study.DelegateSeries.Core.csproj
index 9f5c4f4..dbdcea4 100644
--- a/Study.DelegateSeries.Core/Study.DelegateSeries.Core.csproj
+++ b/Study.DelegateSeries.Core/Study.DelegateSeries.Core.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
diff --git a/Study.DelegateSeries.Core/StudyDelegate.cs b/Study.DelegateSeries.Core/StudyDelegate.cs
index 2de9493..2d3f0eb 100644
--- a/Study.DelegateSeries.Core/StudyDelegate.cs
+++ b/Study.DelegateSeries.Core/StudyDelegate.cs
@@ -1,9 +1,11 @@
-using System;
+using Study.DelegateSeries.Core.Calculator;
+using System;
 
 namespace Study.DelegateSeries.Core
 {
     /// <summary>
     /// 委托学习
+    /// 使用：定义委托、实例化委托、调用委托
     /// </summary>
     public class StudyDelegate
     {
@@ -21,5 +23,85 @@ namespace Study.DelegateSeries.Core
          * 10、总结
          */
 
+        #region 定义委托
+        //基本语法
+        public delegate decimal OperationDelegate(decimal a,decimal b);
+
+        public delegate string ShowTypeNameDelegate();
+
+        public delegate string ShowNameDelegate();
+        #endregion
+
+        #region 实例化委托
+
+        /// <summary>
+        /// 基础语法
+        /// (c#1.0 开始提供)
+        /// </summary>
+        public OperationDelegate BaseInstance()
+        {
+            OperationDelegate operation = new OperationDelegate(new Addition().Add);
+            return operation;
+        }
+
+        /// <summary>
+        /// c#2.0 简写方法
+        /// (基于类型推断)
+        /// </summary>
+        public OperationDelegate AutoTypeInstance()
+        {
+            OperationDelegate operation = new Subtraction().Difference;
+            return operation;
+        }
+
+        /// <summary>
+        /// c#2.0 匿名委托
+        /// (使用匿名方法实例化的委托)
+        /// </summary>
+        public OperationDelegate AnonymousInstance()
+        {
+            //c# 2.0基础语法
+            OperationDelegate operation = delegate (decimal a,decimal b) { return (a * b) * (a * b); };
+            return operation;
+        }
+
+        /// <summary>
+        /// c#3.0 Lambda表达式
+        /// (实质："Lambda表达式"是一个匿名函数)
+        /// </summary>
+        public OperationDelegate LambdaInstance()
+        {
+            OperationDelegate operation = (decimal a,decimal b)=> { return a * a + b * b + 2 * a * b; };
+            //自动推断
+            OperationDelegate operation2 = (a,b) => { return a * a + b * b + 2 * a * b; };
+
+            //{}只有一句时的简写
+            OperationDelegate operation3 = (a, b) => a * a + b * b + 2 * a * b ;
+
+            return operation;
+        }
+
+        #endregion
+
+        #region 调用委托
+        #endregion
+
+        #region 闭包
+        #endregion
+
+        #region 多播委托
+        #endregion
+
+        #region 泛型委托
+        #endregion
+
+        #region 内置委托
+        #endregion
+
+        #region 委托与事件
+        #endregion
+
+        #region 委托与接口
+        #endregion
     }
 }
diff --git a/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.html b/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.html
index 333d5b7..c50522e 100644
--- a/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.html
+++ b/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.html
@@ -17,7 +17,7 @@
 <p>委托和类一样，是一种用于封装命名或匿名方法的用户自定义引用类型。
 委托和类同级，类表示数据集合，委托表示对一个或多个方法的引用,储存的是一系列具有相同参数和返回类型方法的地址列表，调用委托时，此委托列表的所有方法都将被执行。</p>
 </blockquote>
-<p>作用理解：</p>
+<p>语言框架角度：</p>
 <blockquote>
 <p>委托是.net中函数回调机制的实现方式。
 是函数指针在面向对象中的封装，
@@ -29,6 +29,45 @@
 <li>类型安全</li>
 <li>可靠</li>
 </ul>
+<h2 id="section-2">委托演进</h2>
+<ol>
+<li>c# 1.0：基本委托语法</li>
+<li>c# 2.0：实例化可省略new 与 匿名方法</li>
+<li>c# 3.0及以上版本：lambda 表达式(=&gt; 读作 &quot;goes to&quot;)</li>
+<li>c# 3.0之后</li>
+</ol>
+<h2 id="section-3">委托使用场景</h2>
+<p><strong>使用事件或事件设计模式时</strong></p>
+<blockquote>
+<p>就是Observer设计模式，它定义了对象之间一对多的关系，并且通过事件触发机制关联它们。当一个对象中发生了某事件后，依赖它的其他对象会被自动触发并更新。</p>
+</blockquote>
+<p><strong>需要封装静态方法时</strong></p>
+<blockquote>
+<p>委托绑定的方法可以是静态方法、非静态方法和匿名方法，而C#中接口不能是静态的。</p>
+</blockquote>
+<p><strong>调用方不需要访问实现该方法的对象中的其他属性、方法或接口时</strong></p>
+<blockquote>
+<p>类中的某个成员函数绑定到委托，调用该方法时只与这个成员函数有关，与该类里的其他属性无关。</p>
+</blockquote>
+<p><strong>需要方便的组合时</strong></p>
+<blockquote>
+<p>一个委托绑定的多个方法可以自由组合。一个委托的对象可以绑定多个方法，而且这多个方法是没有限制可以任意组合的，委托灵活的绑定和解绑定策略使得使用非常方便。</p>
+</blockquote>
+<p><strong>类可能需要该方法的多个实现时</strong></p>
+<blockquote>
+<p>一个委托的对象可以绑定多个方法(<strong>多播委托</strong>)，当我们运行时需要的不是单一的方法时，接口很难实现。</p>
+</blockquote>
+<h2 id="section-4">委托使用步骤：</h2>
+<h3 id="section-5">1、定义委托</h3>
+<pre><code class="language-c">
+</code></pre>
+<h3 id="section-6">2、实例化委托</h3>
+<pre><code class="language-c#">
+
+</code></pre>
+<h3 id="section-7">3、调用(执行)委托</h3>
+<pre><code class="language-c#">
+</code></pre>
 
 
 </body>
diff --git a/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.md b/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.md
index a87014e..4f0301f 100644
--- a/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.md
+++ b/Study.DelegateSeries.MarkdownDoc/wwwroot/DelegateStudy.md
@@ -12,7 +12,7 @@
 > 委托和类一样，是一种用于封装命名或匿名方法的用户自定义引用类型。
  委托和类同级，类表示数据集合，委托表示对一个或多个方法的引用,储存的是一系列具有相同参数和返回类型方法的地址列表，调用委托时，此委托列表的所有方法都将被执行。 
 
-作用理解：
+语言框架角度：
 
 > 委托是.net中函数回调机制的实现方式。
 > 是函数指针在面向对象中的封装，
@@ -23,5 +23,46 @@
 * 类型安全
 * 可靠
 
+委托演进
+----------
+1. c# 1.0：基本委托语法
+2. c# 2.0：实例化可省略new 与 匿名方法
+3. c# 3.0及以上版本：lambda 表达式(=> 读作 "goes to")
+4. c# 3.0之后 
+
+委托使用场景
+-----------
+**使用事件或事件设计模式时**
+> 就是Observer设计模式，它定义了对象之间一对多的关系，并且通过事件触发机制关联它们。当一个对象中发生了某事件后，依赖它的其他对象会被自动触发并更新。 
+
+**需要封装静态方法时**
+> 委托绑定的方法可以是静态方法、非静态方法和匿名方法，而C#中接口不能是静态的。
+
+**调用方不需要访问实现该方法的对象中的其他属性、方法或接口时**
+> 类中的某个成员函数绑定到委托，调用该方法时只与这个成员函数有关，与该类里的其他属性无关。
+
+**需要方便的组合时**
+> 一个委托绑定的多个方法可以自由组合。一个委托的对象可以绑定多个方法，而且这多个方法是没有限制可以任意组合的，委托灵活的绑定和解绑定策略使得使用非常方便。
+ 
+**类可能需要该方法的多个实现时**
+> 一个委托的对象可以绑定多个方法(**多播委托**)，当我们运行时需要的不是单一的方法时，接口很难实现。
+
+
+委托使用步骤：
+--------------
+### 1、定义委托 ###
+```c sharp
+
+```
+### 2、实例化委托 ###
+``` c#
+
+
+```
+
+### 3、调用(执行)委托 ###
+``` c#
+
+```
 
 
diff --git a/Study.DelegateSeries.Test/DemoTest.cs b/Study.DelegateSeries.Test/DemoTest.cs
new file mode 100644
index 0000000..a9f5165
--- /dev/null
+++ b/Study.DelegateSeries.Test/DemoTest.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+using Study.DelegateSeries.Core;
+
+namespace Study.DelegateSeries.Test
+{
+    public class DemoTest
+    {
+        [Fact]
+        public void Test1()
+        {
+            var _demo = new Demo();
+            var total = _demo.UseDelegate();
+
+            Assert.Equal(25, total);
+        }
+    }
+}
diff --git a/Study.DelegateSeries.Test/Study.DelegateSeries.Test.csproj b/Study.DelegateSeries.Test/Study.DelegateSeries.Test.csproj
index 501a5ce..10f5e03 100644
--- a/Study.DelegateSeries.Test/Study.DelegateSeries.Test.csproj
+++ b/Study.DelegateSeries.Test/Study.DelegateSeries.Test.csproj
@@ -12,4 +12,8 @@
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Study.DelegateSeries.Core\Study.DelegateSeries.Core.csproj" />
+  </ItemGroup>
+
 </Project>