嗨我想了解这个 Account 类构造函数答案

【问题标题】：Hi I am trying to understand this Account class constructor嗨我想了解这个 Account 类构造函数
【发布时间】：2022-06-17 07:23:39
【问题描述】：

命名空间分支演示 { 内部接口 IAccountState { IAccountState Deposit(Action addToBalance); IAccountState 取款（操作减法余额）； IAccountState 冻结（）； IAccountState HolderVerified(); IAccountState Close();

}

命名空间分支演示 { 内部类账户 { 公共小数余额 { 得到；私人套装； }

    private IAccountState State { get; set; }

问题是如何使用这个构造函数？

    public Account(Action onUnfreeze)
    {
        this.State = new NotVerified(onUnfreeze);
    }

    
    public void Deposit(decimal amount)
    {
        this.State = this.State.Deposit(() => { this.Balance += amount; });
    }

    
    public void Withdraw(decimal amount)
    {
        this.State = this.State.Withdraw(() => { this.Balance -= amount; });
    }

    public void HolderVerified()
    {
        this.State = this.State.HolderVerified();
    }

    public void Close()
    {
        this.State = this.State.Close();
    }

    public void Freeze()
    {
        this.State = this.State.Freeze();
    }

}

}

命名空间分支演示 { 内部类 Active : IAccountState { 私人操作 OnUnfreeze { 获取； }

    public Active(Action onUnfreeze)
    {
        this.OnUnfreeze = onUnfreeze;
    }

    public IAccountState Deposit(Action addToBalance)
    {
        addToBalance();
        return this;
    }

    public IAccountState Withdraw(Action subtractFromBalance)
    {
        subtractFromBalance();
        return this;
    }

    public IAccountState Freeze() => new Frozen(this.OnUnfreeze);
    public IAccountState HolderVerified() => this;
    public IAccountState Close() => new Closed();

}

}

命名空间分支演示 { 内部类已关闭：IAccountState { public IAccountState Deposit(Action addToBalance) => this; 公共 IAccountState 取款（操作减法余额）=> 这个；公共 IAccountState 冻结（） => 这个；公共 IAccountState HolderVerified() => 这个； public IAccountState Close() => this;

}

命名空间分支演示 { 内部类冻结：IAccountState { 私人操作 OnUnfreeze { 获取； }

    public Frozen(Action onUnfreeze)
    {
        this.OnUnfreeze = onUnfreeze;
    }

    public IAccountState Deposit(Action addToBalance)
    {
        this.OnUnfreeze();
        addToBalance();
        return new Active(this.OnUnfreeze);
    }

    public IAccountState Withdraw(Action subtractFromBalance)
    {
        this.OnUnfreeze();
        subtractFromBalance();
        return new Active(this.OnUnfreeze);
    }

    public IAccountState Freeze() => this;
    public IAccountState HolderVerified() => this;
    public IAccountState Close() => new Closed();

}

}

命名空间分支演示 { 内部类 NotVerified : IAccountState { 私人操作 OnUnfreeze { 获取； }

    public NotVerified(Action onUnfreeze)
    {
        this.OnUnfreeze = onUnfreeze;
    }

    public IAccountState Close() => new Closed();

    public IAccountState Deposit(Action addToBalance)
    {
        addToBalance();
        return this;
    }

    public IAccountState Freeze() => this;

    public IAccountState HolderVerified() => new Active(this.OnUnfreeze);

    public IAccountState Withdraw(Action subtractFromBalance) => this;

}

}

【问题讨论】：

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标签： c#