static void Main(string[] args)
{
ICommandReceiver recevier = new CommandReceiver();
Invoker invoker = new Invoker();
invoker.Add(new InsertCommand(recevier));
invoker.Add(new InsertCommand(recevier));
invoker.Add(new UpdateCommand(recevier));
invoker.Add(new DeleteCommand(recevier));
invoker.ExecuteAsync();
}
/// <summary>
/// 通够构造方法，明确我们要使用任务接收者
/// </summary>
/// <param name="receiver"></param>
public Method1Command(CommandReceiver receiver)
{
this.receiver = receiver;
}