From 3d26bffc074c7c00b794c385b35ccaf42e516d3a Mon Sep 17 00:00:00 2001
From: syneffort <syneffort@gmail.com>
Date: Mon, 10 Jul 2023 17:38:39 +0900
Subject: [PATCH] command pattern

---
 .../CommandPatternSample/App.config           |   6 +
 PacticeSolution/CommandPatternSample/App.xaml |   9 ++
 .../CommandPatternSample/App.xaml.cs          |  17 +++
 .../Command/RelayCommand.cs                   |  39 ++++++
 .../CommandPatternSample.csproj               | 100 +++++++++++++++
 .../CommandPatternSample/MainWindow.xaml      |  28 +++++
 .../CommandPatternSample/MainWindow.xaml.cs   |  28 +++++
 .../CommandPatternSample/Model/Emp.cs         |  18 +++
 .../Properties/AssemblyInfo.cs                |  55 ++++++++
 .../Properties/Resources.Designer.cs          |  71 +++++++++++
 .../Properties/Resources.resx                 | 117 ++++++++++++++++++
 .../Properties/Settings.Designer.cs           |  30 +++++
 .../Properties/Settings.settings              |   7 ++
 .../ViewModel/EmpViewModel.cs                 |  72 +++++++++++
 PacticeSolution/PacticeSolution.sln           |   6 +
 15 files changed, 603 insertions(+)
 create mode 100644 PacticeSolution/CommandPatternSample/App.config
 create mode 100644 PacticeSolution/CommandPatternSample/App.xaml
 create mode 100644 PacticeSolution/CommandPatternSample/App.xaml.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Command/RelayCommand.cs
 create mode 100644 PacticeSolution/CommandPatternSample/CommandPatternSample.csproj
 create mode 100644 PacticeSolution/CommandPatternSample/MainWindow.xaml
 create mode 100644 PacticeSolution/CommandPatternSample/MainWindow.xaml.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Model/Emp.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Properties/AssemblyInfo.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Properties/Resources.Designer.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Properties/Resources.resx
 create mode 100644 PacticeSolution/CommandPatternSample/Properties/Settings.Designer.cs
 create mode 100644 PacticeSolution/CommandPatternSample/Properties/Settings.settings
 create mode 100644 PacticeSolution/CommandPatternSample/ViewModel/EmpViewModel.cs

diff --git a/PacticeSolution/CommandPatternSample/App.config b/PacticeSolution/CommandPatternSample/App.config
new file mode 100644
index 0000000..8e15646
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/App.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    </startup>
+</configuration>
\ No newline at end of file
diff --git a/PacticeSolution/CommandPatternSample/App.xaml b/PacticeSolution/CommandPatternSample/App.xaml
new file mode 100644
index 0000000..dcf1550
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/App.xaml
@@ -0,0 +1,9 @@
+<Application x:Class="CommandPatternSample.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:CommandPatternSample"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/PacticeSolution/CommandPatternSample/App.xaml.cs b/PacticeSolution/CommandPatternSample/App.xaml.cs
new file mode 100644
index 0000000..7fda16c
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/App.xaml.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace CommandPatternSample
+{
+    /// <summary>
+    /// App.xaml에 대한 상호 작용 논리
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/Command/RelayCommand.cs b/PacticeSolution/CommandPatternSample/Command/RelayCommand.cs
new file mode 100644
index 0000000..2773bca
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Command/RelayCommand.cs
@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace CommandPatternSample.Command
+{
+    internal class RelayCommand : ICommand
+    {
+        private Func<object, bool> _canExecute;
+        private Action<object> _executeAction;
+
+        public event EventHandler CanExecuteChanged;
+
+        public RelayCommand(Action<object> executeAction, Func<object, bool> canExeute)
+        {
+            _executeAction = executeAction ?? throw new ArgumentNullException("Execute action is not null");
+            _canExecute = canExeute;
+        }
+
+        public RelayCommand(Action<object> executeAction) : this(executeAction, null)
+        {
+            
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            bool result = _canExecute == null ? true : _canExecute.Invoke(parameter);
+            return result;
+        }
+
+        public void Execute(object parameter)
+        {
+            _executeAction.Invoke(parameter);
+        }
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/CommandPatternSample.csproj b/PacticeSolution/CommandPatternSample/CommandPatternSample.csproj
new file mode 100644
index 0000000..5cbfc1c
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/CommandPatternSample.csproj
@@ -0,0 +1,100 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{D7C77FA4-195E-4247-90B2-C89BF5016FDE}</ProjectGuid>
+    <OutputType>WinExe</OutputType>
+    <RootNamespace>CommandPatternSample</RootNamespace>
+    <AssemblyName>CommandPatternSample</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <ApplicationDefinition Include="App.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </ApplicationDefinition>
+    <Compile Include="Command\RelayCommand.cs" />
+    <Compile Include="ViewModel\EmpViewModel.cs" />
+    <Page Include="MainWindow.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="App.xaml.cs">
+      <DependentUpon>App.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="MainWindow.xaml.cs">
+      <DependentUpon>MainWindow.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Model\Emp.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs">
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+    <Compile Include="Properties\Settings.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Settings.settings</DependentUpon>
+      <DesignTimeSharedInput>True</DesignTimeSharedInput>
+    </Compile>
+    <EmbeddedResource Include="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+    <None Include="Properties\Settings.settings">
+      <Generator>SettingsSingleFileGenerator</Generator>
+      <LastGenOutput>Settings.Designer.cs</LastGenOutput>
+    </None>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/PacticeSolution/CommandPatternSample/MainWindow.xaml b/PacticeSolution/CommandPatternSample/MainWindow.xaml
new file mode 100644
index 0000000..cc0693e
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/MainWindow.xaml
@@ -0,0 +1,28 @@
+<Window x:Class="CommandPatternSample.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:CommandPatternSample"
+        xmlns:vm="clr-namespace:CommandPatternSample.ViewModel"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="300" Width="400">
+    <Window.DataContext>
+        <vm:EmpViewModel/>
+    </Window.DataContext>
+    
+    <StackPanel Margin="10">
+        <TextBlock Text="Enter the employee name."/>
+        <TextBox x:Name="tbName"
+                 Text="{Binding SelectedEmp.Name}"/>
+        <Button Content="Add"
+                Command="{Binding AddEmpCommand}"
+                CommandParameter="{Binding ElementName=tbName, Path=Text}"/>
+        <ListBox x:Name="lbEmps" 
+                 ItemsSource="{Binding Emps}"
+                 SelectedItem="{Binding SelectedEmp}"
+                 DisplayMemberPath="Name"/>
+        <Label Height="40" Width="150" HorizontalAlignment="Center"
+               Content="{Binding ElementName=lbEmps, Path=SelectedItem}"/>
+    </StackPanel>
+</Window>
diff --git a/PacticeSolution/CommandPatternSample/MainWindow.xaml.cs b/PacticeSolution/CommandPatternSample/MainWindow.xaml.cs
new file mode 100644
index 0000000..6946cb8
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/MainWindow.xaml.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace CommandPatternSample
+{
+    /// <summary>
+    /// MainWindow.xaml에 대한 상호 작용 논리
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/Model/Emp.cs b/PacticeSolution/CommandPatternSample/Model/Emp.cs
new file mode 100644
index 0000000..4e14374
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Model/Emp.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CommandPatternSample.Model
+{
+    internal class Emp
+    {
+        public string Name { get; set; }
+        public string Job { get; set; }
+        public override string ToString()
+        {
+            return $"[ {this.Name}, {this.Job} ]";
+        }
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/Properties/AssemblyInfo.cs b/PacticeSolution/CommandPatternSample/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..7c9b833
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Properties/AssemblyInfo.cs
@@ -0,0 +1,55 @@
+using System.Reflection;
+using System.Resources;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// 어셈블리에 대한 일반 정보는 다음 특성 집합을 통해 
+// 제어됩니다. 어셈블리와 관련된 정보를 수정하려면
+// 이러한 특성 값을 변경하세요.
+[assembly: AssemblyTitle("CommandPatternSample")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("CommandPatternSample")]
+[assembly: AssemblyCopyright("Copyright ©  2023")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// ComVisible을 false로 설정하면 이 어셈블리의 형식이 COM 구성 요소에 
+// 표시되지 않습니다. COM에서 이 어셈블리의 형식에 액세스하려면
+// 해당 형식에 대해 ComVisible 특성을 true로 설정하세요.
+[assembly: ComVisible(false)]
+
+//지역화 가능 애플리케이션 빌드를 시작하려면 다음을 설정하세요.
+//.csproj 파일에서 <PropertyGroup> 내에 <UICulture>CultureYouAreCodingWith</UICulture>를
+//설정하십시오. 예를 들어 소스 파일에서 영어(미국)를
+//사용하는 경우 <UICulture>를 en-US로 설정합니다. 그런 다음 아래
+//NeutralResourceLanguage 특성의 주석 처리를 제거합니다. 아래 줄의 "en-US"를 업데이트하여
+//프로젝트 파일의 UICulture 설정과 일치시킵니다.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //테마별 리소스 사전의 위치
+                                     //(페이지 또는 응용 프로그램 리소스 사진에
+                                     // 리소스가 없는 경우에 사용됨)
+    ResourceDictionaryLocation.SourceAssembly //제네릭 리소스 사전의 위치
+                                              //(페이지 또는 응용 프로그램 리소스 사진에
+                                              // 리소스가 없는 경우에 사용됨)
+)]
+
+
+// 어셈블리의 버전 정보는 다음 네 가지 값으로 구성됩니다.
+//
+//      주 버전
+//      부 버전 
+//      빌드 번호
+//      수정 버전
+//
+// 모든 값을 지정하거나 아래와 같이 '*'를 사용하여 빌드 번호 및 수정 번호를
+// 기본값으로 할 수 있습니다.
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
diff --git a/PacticeSolution/CommandPatternSample/Properties/Resources.Designer.cs b/PacticeSolution/CommandPatternSample/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..c2dea6a
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Properties/Resources.Designer.cs
@@ -0,0 +1,71 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     이 코드는 도구를 사용하여 생성되었습니다.
+//     런타임 버전:4.0.30319.42000
+//
+//     파일 내용을 변경하면 잘못된 동작이 발생할 수 있으며, 코드를 다시 생성하면
+//     이러한 변경 내용이 손실됩니다.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace CommandPatternSample.Properties
+{
+
+
+    /// <summary>
+    ///   지역화된 문자열 등을 찾기 위한 강력한 형식의 리소스 클래스입니다.
+    /// </summary>
+    // 이 클래스는 ResGen 또는 Visual Studio와 같은 도구를 통해 StronglyTypedResourceBuilder
+    // 클래스에서 자동으로 생성되었습니다.
+    // 멤버를 추가하거나 제거하려면 .ResX 파일을 편집한 다음 /str 옵션을 사용하여
+    // ResGen을 다시 실행하거나 VS 프로젝트를 다시 빌드하십시오.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "4.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources
+    {
+
+        private static global::System.Resources.ResourceManager resourceMan;
+
+        private static global::System.Globalization.CultureInfo resourceCulture;
+
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources()
+        {
+        }
+
+        /// <summary>
+        ///   이 클래스에서 사용하는 캐시된 ResourceManager 인스턴스를 반환합니다.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager
+        {
+            get
+            {
+                if ((resourceMan == null))
+                {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("CommandPatternSample.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+
+        /// <summary>
+        ///   이 강력한 형식의 리소스 클래스를 사용하여 모든 리소스 조회에 대해 현재 스레드의 CurrentUICulture 속성을
+        ///   재정의합니다.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture
+        {
+            get
+            {
+                return resourceCulture;
+            }
+            set
+            {
+                resourceCulture = value;
+            }
+        }
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/Properties/Resources.resx b/PacticeSolution/CommandPatternSample/Properties/Resources.resx
new file mode 100644
index 0000000..af7dbeb
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Properties/Resources.resx
@@ -0,0 +1,117 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>
\ No newline at end of file
diff --git a/PacticeSolution/CommandPatternSample/Properties/Settings.Designer.cs b/PacticeSolution/CommandPatternSample/Properties/Settings.Designer.cs
new file mode 100644
index 0000000..e6c1466
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Properties/Settings.Designer.cs
@@ -0,0 +1,30 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace CommandPatternSample.Properties
+{
+
+
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.VisualStudio.Editors.SettingsDesigner.SettingsSingleFileGenerator", "11.0.0.0")]
+    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase
+    {
+
+        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));
+
+        public static Settings Default
+        {
+            get
+            {
+                return defaultInstance;
+            }
+        }
+    }
+}
diff --git a/PacticeSolution/CommandPatternSample/Properties/Settings.settings b/PacticeSolution/CommandPatternSample/Properties/Settings.settings
new file mode 100644
index 0000000..033d7a5
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/Properties/Settings.settings
@@ -0,0 +1,7 @@
+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="uri:settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>
\ No newline at end of file
diff --git a/PacticeSolution/CommandPatternSample/ViewModel/EmpViewModel.cs b/PacticeSolution/CommandPatternSample/ViewModel/EmpViewModel.cs
new file mode 100644
index 0000000..91cc43c
--- /dev/null
+++ b/PacticeSolution/CommandPatternSample/ViewModel/EmpViewModel.cs
@@ -0,0 +1,72 @@
+using CommandPatternSample.Command;
+using CommandPatternSample.Model;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CommandPatternSample.ViewModel
+{
+    internal class EmpViewModel : INotifyPropertyChanged
+    {
+        private Emp _selectedEmp;
+        private ObservableCollection<Emp> _emps;
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public RelayCommand AddEmpCommand { get; set; }
+
+
+        public EmpViewModel()
+        {
+            this.Emps = new ObservableCollection<Emp>();
+            this.Emps.Add(new Emp() { Name = "Tom", Job = "Sales" });
+            this.Emps.Add(new Emp() { Name = "Jack", Job = "Clerk" });
+            this.Emps.Add(new Emp() { Name = "Phinix", Job = "Manager" });
+            this.Emps.Add(new Emp() { Name = "John", Job = "Sales" });
+            this.Emps.Add(new Emp() { Name = "Richard", Job = "Cleaning" });
+
+            this.AddEmpCommand = new RelayCommand(new Action<object>(AddEmp));
+        }
+
+        public Emp SelectedEmp
+        {
+            get { return _selectedEmp; }
+            set
+            {
+                _selectedEmp = value;
+                this.OnPropertyChanged(nameof(SelectedEmp));
+            }
+        }
+
+        public ObservableCollection<Emp> Emps
+        {
+            get { return _emps; }
+            set
+            {
+                _emps = value;
+                this.OnPropertyChanged(nameof(Emps));
+            }
+        }
+
+        public void AddEmp(object param)
+        {
+            if (string.IsNullOrEmpty(param.ToString()))
+                return;
+
+            this.Emps.Add(new Emp { Name = param.ToString(), Job = "New Job" });
+        }
+
+        private void OnPropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            if (this.PropertyChanged == null)
+                return;
+
+            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}
diff --git a/PacticeSolution/PacticeSolution.sln b/PacticeSolution/PacticeSolution.sln
index 58cba8b..1a51f19 100644
--- a/PacticeSolution/PacticeSolution.sln
+++ b/PacticeSolution/PacticeSolution.sln
@@ -75,6 +75,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SimpleDataBinding", "Simple
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataBindByINotifyPropertyChangedSample", "DataBindByINotifyPropertyChangedSample\DataBindByINotifyPropertyChangedSample.csproj", "{8AC04681-4724-4F24-B24A-FE1140D2E6EA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CommandPatternSample", "CommandPatternSample\CommandPatternSample.csproj", "{D7C77FA4-195E-4247-90B2-C89BF5016FDE}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -225,6 +227,10 @@ Global
 		{8AC04681-4724-4F24-B24A-FE1140D2E6EA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8AC04681-4724-4F24-B24A-FE1140D2E6EA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8AC04681-4724-4F24-B24A-FE1140D2E6EA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D7C77FA4-195E-4247-90B2-C89BF5016FDE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D7C77FA4-195E-4247-90B2-C89BF5016FDE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D7C77FA4-195E-4247-90B2-C89BF5016FDE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D7C77FA4-195E-4247-90B2-C89BF5016FDE}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE