static void Main(string[] args)
{
HelloWorldWriterType helloWorldWriterType = (HelloWorldWriterType)Enum.Parse(typeof(HelloWorldWriterType), ConfigurationManager.AppSettings["WriterType"] ?? "0");
IHelloWorldWriter writer = HelloWorldWriterFactory.GetInstance(helloWorldWriterType);
writer.Write("Hello World");
Environment.Exit(0);
}
public static IHelloWorldWriter GetInstance(HelloWorldWriterType type)
{
switch (type)
{
case HelloWorldWriterType.Console:
return(new ConsoleHelloWorldWriter());
case HelloWorldWriterType.Database:
return(new DataBaseHelloWorldWriter());
default:
throw new NotImplementedException();
}
}