Question

有人可以帮忙吗？我无法理解为什么当我按下按钮7时bool floorOne总是设置为false，即使我先按下button3或button1。这应该是一个相当简单的问题，只有在初始化时，按下button2或按下button4时才会出错。我不知道它是如何回归假的。

它可能有一个相对简单的解决方案，但我找不到它，谢谢你的时间。

编辑：当我调试时，它显示为false，我不知道这些信息是否会有所帮助。我知道很多代码可能不需要包含在这里，但是为了防止出现问题，我想我应该把它添加进来。

Edit2：太棒了，非常感谢大家！

using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Elevator
{
    public partial class Form1 : Form
    {
        public bool doorsOpen;
        public bool floorOne;
        public bool groundFloor;
        public Form1()
        {
            InitializeComponent();

            pictureBox1.Visible = false; // This is the bottom floor doors closed picture
            pictureBox2.Visible = true; // This is the bottom floor doors open picture
            pictureBox3.Visible = false; // This is the top floor doors closed picture
            pictureBox4.Visible = false; // This is the top floor doors open picture
            floorOne = false;
            richTextBox1.Text = "Ground floor";
            button1.BackColor = Color.Gray;
            button2.BackColor = Color.Gray;
            button3.Enabled = true;
            button4.Enabled = false; // This makes it impossible to click the buttons if
            button5.Enabled = false; // the lift is already on that floor, to start with this is the
            button6.Enabled = true;  // ground floor.
            button5.BackColor = Color.Black;
            button6.BackColor = Color.Red;
            doorsOpen = true;
            richTextBox2.Text = "Doors open";
        }

        public void Form1_Load(object sender, EventArgs e)
        {

        }

        public void button3_Click(object sender, EventArgs e)
        {
            if (doorsOpen == true)
            {
                doorsOpen = false;
                richTextBox2.Text = "Doors closed";
            }
            pictureBox1.Visible = false; // This is the bottom floor doors closed picture
            pictureBox2.Visible = false; // This is the bottom floor doors open picture
            pictureBox3.Visible = true; // This is the top floor doors closed picture
            pictureBox4.Visible = false; // This is the top floor doors open picture
            bool floorOne = true;
            button1.BackColor = Color.Gray;
            button2.BackColor = Color.Gray;
            richTextBox1.Text = "First floor";
            button3.Enabled = false;
            button4.Enabled = true;
            button5.Enabled = true;
            button6.Enabled = false;
            button5.BackColor = Color.Red;
            button6.BackColor = Color.Black;
        }

        public void button4_Click(object sender, EventArgs e)
        {
            if (doorsOpen == true)
            {
                doorsOpen = false;
                richTextBox2.Text = "Doors closed";
            }
            pictureBox1.Visible = true; // This is the bottom floor doors closed picture
            pictureBox2.Visible = false; // This is the bottom floor doors open picture
            pictureBox3.Visible = false; // This is the top floor doors closed picture
            pictureBox4.Visible = false; // This is the top floor doors open picture
            bool floorOne = false;
            button1.BackColor = Color.Gray;
            button2.BackColor = Color.Gray;
            richTextBox1.Text = "Ground floor";
            button3.Enabled = true;
            button4.Enabled = false;
            button5.Enabled = false; 
            button6.Enabled = true;  
            button5.BackColor = Color.Black;
            button6.BackColor = Color.Red;
        }

        public void button7_Click(object sender, EventArgs e)
        {
            doorsOpen = true;
            richTextBox2.Text = "Doors open";
           if (floorOne == true)
           { 
            pictureBox1.Visible = false; // This is the bottom floor doors closed picture
            pictureBox2.Visible = false; // This is the bottom floor doors open picture
            pictureBox3.Visible = false; // This is the top floor doors closed picture
            pictureBox4.Visible = true; // This is the top floor doors open picture
           }
           else if (floorOne != true)
           {
               pictureBox1.Visible = false; // This is the bottom floor doors closed picture
               pictureBox2.Visible = true; // This is the bottom floor doors open picture
               pictureBox3.Visible = false; // This is the top floor doors closed picture
               pictureBox4.Visible = false; // This is the top floor doors open picture
           }
        }

        public void button1_Click(object sender, EventArgs e)
        {
            if (doorsOpen == true)
            {
                doorsOpen = false;
                richTextBox2.Text = "Doors closed";
            }
            pictureBox1.Visible = false; // This is the bottom floor doors closed picture
            pictureBox2.Visible = false; // This is the bottom floor doors open picture
            pictureBox3.Visible = true; // This is the top floor doors closed picture
            pictureBox4.Visible = false; // This is the top floor doors open picture
            bool floorOne = true;
            button1.BackColor = Color.Yellow;
            button2.BackColor = Color.Gray;
            richTextBox1.Text = "First floor";
            button3.Enabled = false;
            button4.Enabled = true;
            button5.Enabled = true;
            button6.Enabled = false;
            button5.BackColor = Color.Red;
            button6.BackColor = Color.Black;

        }

        public void button2_Click(object sender, EventArgs e)
        {
            if (doorsOpen == true)
            {
                doorsOpen = false;
                richTextBox2.Text = "Doors closed";
            }
            pictureBox1.Visible = true; // This is the bottom floor doors closed picture
            pictureBox2.Visible = false; // This is the bottom floor doors open picture
            pictureBox3.Visible = false; // This is the top floor doors closed picture
            pictureBox4.Visible = false; // This is the top floor doors open picture
            bool floorOne = false;
            button1.BackColor = Color.Gray;
            button2.BackColor = Color.Yellow;
            richTextBox1.Text = "Ground floor";
            button3.Enabled = true;
            button4.Enabled = false;
            button5.Enabled = false;
            button6.Enabled = true;
            button5.BackColor = Color.Black;
            button6.BackColor = Color.Red;
        }
     }
}

Answer 1

因为在某些方法中，您声明了一个 new floorOne变量，而不是修改现有的Form1字段。

替换

bool floorOne = true;

与

floorOne = true;

Answer 2

在Button3和button4单击事件中删除bool变量的声明，只需更新它的值。因为您已经定义了 bool floorOne 所以您不需要再次声明它。

<强>更新

bool floorOne = true;

要

floorOne = true;

Answer 3

这真的有一个简单的解决方案。让我们说，你点击button1然后你想将floorOne设置为true，但你真正做的是：创建新的LOCAL布尔值floorOne并将其设置为true（bool floorOne = true;）。但这并没有改变你的GLOBAL值floorOne。它具有相同的名称，但在这种情况下无关紧要。删除代码中button1中的“bool”文本，然后“floorOne”将成为您的全局值。

button1的新代码（所有其他按钮的更改相同）：

public void button1_Click(object sender, EventArgs e)
    {
        if (doorsOpen == true)
        {
            doorsOpen = false;
            richTextBox2.Text = "Doors closed";
        }
        pictureBox1.Visible = false; // This is the bottom floor doors closed picture
        pictureBox2.Visible = false; // This is the bottom floor doors open picture
        pictureBox3.Visible = true; // This is the top floor doors closed picture
        pictureBox4.Visible = false; // This is the top floor doors open picture
        floorOne = true; // HERE IS THE CHANGE
        button1.BackColor = Color.Yellow;
        button2.BackColor = Color.Gray;
        richTextBox1.Text = "First floor";
        button3.Enabled = false;
        button4.Enabled = true;
        button5.Enabled = true;
        button6.Enabled = false;
        button5.BackColor = Color.Red;
        button6.BackColor = Color.Black;
    }

试试这个：

public partial class Form1 : Form
{
    public bool floorOne; // global value (automatically set to false (default value of false)

    public Form1()
    {
        InitializeComponent();
    }

    public void button3_Click(object sender, EventArgs e)
    {
        bool floorOne = true; // new local value named floorOne (doesn change your global value)
        MessageBox.Show("value of global floorOne is: " + this.floorOne.ToString());
        // this.floorOne is your global value (try to find something about "this.")
        this.floorOne = true;
        MessageBox.Show("value of global floorOne is: " + this.floorOne.ToString());
    }
}

C＃总是假布尔

3 个答案: