設計模式二(簡單工廠模式)
阿新 • • 發佈:2017-11-16
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學習筆記之設計模式二,簡單工廠;
假設要取得數據庫連接字符串,
1.創建抽象類:
public abstract class ConnectString { //輸出字符串 public abstract string GetConnectString(); }
2.創建各個實體類:
public class SqlConnectString : ConnectString { public override string GetConnectString() { return "SQL ConnectString"; //throw new NotImplementedException(); } } public class MySqlConnectString : ConnectString { public override string GetConnectString() { return "MySql ConnectString"; //throw new NotImplementedException(); } }
3.創建簡單工廠類
public class SimpleFactory { /// <summary> /// 靜態方法創建Product實例 /// </summary> public static ConnectString CreatConnectString(string dbtype) { ConnectString connect = null; switch(dbtype) { case "MySql": connect = new MySqlConnectString(); break; case "SqlServer": connect = new SqlConnectString(); break; } return connect; } }
4.客戶端調用
static void Main(string[] args) { ConnectString connectString = SimpleFactory.CreatConnectString("MySql"); Console.WriteLine(connectString.GetConnectString()); ConnectString connectString2 = SimpleFactory.CreatConnectString("SqlServer"); Console.WriteLine(connectString2.GetConnectString()); Console.Read(); }
設計模式二(簡單工廠模式)