做了一個小東西，里面有多個角色，每個角色都有特殊的菜單項，現使用策略模式對其簡單實現。

關于策略模式的介紹請參考其他書籍。

下面是項目架構和實現：

架構：

實現：

IMenuStrategy.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StrategyPattern.BLL
{
public interface IMenuStrategy
{
void ShowMenu(System.Windows.Forms.MenuStrip ms);
}
}

Developer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StrategyPattern.BLL
{
public class Developer:IMenuStrategy
{
public void ShowMenu(System.Windows.Forms.MenuStrip ms)
{
ms.Items[0].Visible = false;
ms.Items[1].Visible = false;
ms.Items[2].Visible = false;
ms.Items[3].Visible = true;
ms.Items[4].Visible = false;
ms.Items[5].Visible = true;
}
}
}

Tester.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StrategyPattern.BLL
{
public class Tester:IMenuStrategy
{
public void ShowMenu(System.Windows.Forms.MenuStrip ms)
{
ms.Items[0].Visible = false;
ms.Items[1].Visible = false;
ms.Items[2].Visible = false;
ms.Items[3].Visible = false;
ms.Items[4].Visible = true;
ms.Items[5].Visible = true;
}
}
}

CommonUser.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StrategyPattern.BLL
{
public class CommonUser:IMenuStrategy
{
public void ShowMenu(System.Windows.Forms.MenuStrip ms)
{
ms.Items[0].Visible = true;
ms.Items[1].Visible = true;
ms.Items[2].Visible = true;
ms.Items[3].Visible = true;
ms.Items[4].Visible = true;
ms.Items[5].Visible = true;
}
}
}

MenuOP.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StrategyPattern.BLL
{
public class MenuOP
{
private IMenuStrategy ims;
public MenuOP(IMenuStrategy menuStrategy)
{
ims = menuStrategy;
}
public void SetMenu(System.Windows.Forms.MenuStrip ms)
{
ims.ShowMenu(ms);
}
}
}

界面：

代碼：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace StrategyPattern
{
public partial class Login : Form
{
public Login()
{
InitializeComponent();

}
private static string role;
public static string Role
{
get
{
return role;
}
set
{
role = value;
}
}
private void btnSubmit_Click(object sender, EventArgs e)
{
switch (txtName.Text.Trim())
{
case "D":
case "d":
if (txtPwd.Text.Trim() == "d")
{
Role = "d";
MainForm mf = new MainForm();
mf.Show();
}
break;
case "t":
case "T":
if (txtPwd.Text.Trim() == "t")
{
Role = "t";
MainForm mf = new MainForm();
mf.Show();
}
break;
case "c":
case "C":
if (txtPwd.Text.Trim() == "c")
{
Role = "c";
MainForm mf = new MainForm();
mf.Show();
}
break;

}
}
}
}

不同的登錄界面：

開發：

測試 ：

經理：

代碼：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace StrategyPattern
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}

private void MainForm_Load(object sender, EventArgs e)
{
switch (Login.Role)
{
case "d":
case "D":
BLL.MenuOP mo = new StrategyPattern.BLL.MenuOP(new BLL.Developer());
mo.SetMenu(this.mainMenuStrip);
break;
case "t":
case "T":
BLL.MenuOP mo1 = new StrategyPattern.BLL.MenuOP(new BLL.Tester());
mo1.SetMenu(this.mainMenuStrip);
break;
case "c":
case "C":
BLL.MenuOP mo2 = new StrategyPattern.BLL.MenuOP(new BLL.CommonUser());
mo2.SetMenu(this.mainMenuStrip);
break;
}
}
}
}

策略模式的典型應用