这个 C# 公共方法没有返回值

Question

我有三个类，下面提供代码。

网络 - 添加和删除电话，处理呼叫。 Phone1和Phone2加入网络后可以互相通话。

但是当我将手机连接到网络并尝试将 phone1 呼叫到 phone2 时，我遇到了问题；它一直让我“接收器忙”。从phone1调用时，我尝试进行一些调试并读取phone2的状态，但它返回一个空字符串（实际上应该返回“A”，当它被添加到网络时，因为我将其值设置为“A ")。

public partial class network : Form
{
    phone1 p1 = new phone1();
    phone2 p2 = new phone2();
    public network()
    {
        InitializeComponent();
    }

    public Boolean numberValidator(int number)
    {
        Boolean exist = false;
        if (comboBox2.Items.Equals(number))
        {
            exist = true;
        }

        return exist;
    }

    public void processCall(int rNumber)
    {
        if (!numberValidator(rNumber))
        {
            p1.TextBox1.Clear();
            p1.TextBox1.Text = "Not connected";
        }

        else
        {
            p1.TextBox1.Clear();
            p1.TextBox1.Text = "Call in progress";
            p2.receiveCall(1);
            p1.setStatus("Busy");
            /*
            if (p2.btnCallPressStatus())
            {
            p1.TextBox1.Clear();

            p1.TextBox1.Text = "Call initiated";
            }*/
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (comboBox1.SelectedIndex == 0)
        {
            p1.Show();
            comboBox2.Items.Add(1);
            p1.setStatus("A");
        }
        if (comboBox1.SelectedIndex == 1)
        {
            p2.Show();
            comboBox2.Items.Add(2);
            p2.setStatus("A");
        }
    }
}

---------Phone1 类---------

public partial class phone1 : Form
{
    public phone1()
    {
        InitializeComponent();
    }

    string status;
    public void setStatus(string Status)
    {
        status = Status;
    }

    public string returnStatus()
    {
        return status;
    }

    public void receiveCall(int callerNumber)
    {
        setStatus("Busy");
        btnCall.Text = "Answer";
        textBox1.Text = "Phone " + callerNumber + " Calling.";
    }

    public void makeCall(int number)
    {
        phone2 p2 = new phone2();
        network net = new network();

        MessageBox.Show(p2.returnStatus()); // this line not returing status of phone2
        if (p2.returnStatus() == "A")
        {
            net.processCall(number);
        }
        else
        {
            textBox1.Text = "Receiver Busy";
        }
    }

    public TextBox TextBox1
    {
        get
        {
            return textBox1;
        }
    }

    private void btnCall_Click(object sender, EventArgs e)
    {
        string number = textBox1.Text;
        int numberInt = Convert.ToInt16(number);

        makeCall(numberInt);
    }

    string phoneNo = "";
    private void btn2_Click(object sender, EventArgs e)
    {
        phoneNo = phoneNo + btn2.Text;
        textBox1.Text = phoneNo;
    }
}

-------------phone2 类-------------

public partial class phone2 : phone1
{
    public phone2()
    {
        InitializeComponent();
    }
}

Answer 1

例程 makeCall 正在创建 phone2 的新实例，然后调用 returnStatus。问题是在创建 p2 时字符串“status”没有被初始化为任何值，所以返回值永远不会是“A”，你总是会失败。