Question

我是C＃的初学者，我有一份家庭作业。在表单中，我有一个带有5个单选按钮和数字上/下数天的组合框。当我改变数量。上下，背景颜色应该改变之前选择的颜色。我只能使用switch-case。我管理了这个数字。上下，标签随之变化。但我无法插入开关盒以换色。实际上我无法命名开关。

 private void Form1_Load(object sender, EventArgs e)
        {
            label1.Text = "Pazartesi";


        }

        private void numericUpDown1_ValueChanged(object sender, EventArgs e)
        {
            byte sayi = Convert.ToByte(numericUpDown1.Value);


            switch (sayi)
            {
                case 1:
                    label1.Text="Pazartesi";
                    switch ( )
                    {
                        case renkbtn_1.Checked:
                            this.BackColor = Color.Red;
                            break;
                        case renkbtn_2.Checked:
                            this.BackColor = Color.White;
                            break;
                        case renkbtn_3.Checked:
                            this.BackColor = Color.Yellow;
                            break;
                        case renkbtn_4.Checked:
                            this.BackColor = Color.Blue;
                            break;
                        case renkbtn_5.Checked:
                            this.BackColor = Color.Green;
                            break;
                    }
                    break;
                case 2:
                    label1.Text="Salı";
                    break;
                case 3:
                    label1.Text = "Çarşamba";
                    break;
                case 4:
                    label1.Text = "Perşembe";
                    break;
                case 5:
                    label1.Text = "Cuma";
                    break;
                case 6:
                    label1.Text = "Cumartesi";
                    break;
                case 7:
                    label1.Text = "Pazar";
                    break;

Answer 1

switch语句不起作用。

switch ( )中的大括号内应该是一个表达式，它会产生一些值（它的不是一个'name'，但可能是一个变量）。那些case必须具有（编译时）常量，这些常量将根据switch表达式中的值进行检查。

您必须将其重写为一堆if语句：

  if (renkbtn_1.Checked)
      this.BackColor = Color.Red;
  else if (renkbtn_2.Checked)
      this.BackColor = Color.White;
  else if (renkbtn_3.Checked)
      this.BackColor = Color.Yellow;
  else if (renkbtn_4.Checked)
      this.BackColor = Color.Blue;
  else if (renkbtn_5.Checked)
      this.BackColor = Color.Green;

Answer 2

如果我理解了这个问题，你可以改变上下值，你想要将背景颜色设置为你选择的无线电按钮的颜色。正确？

如果是这种情况，你必须检查哪个radiobutton然后正确设置颜色。

然后，您可以遍历组框的控件以获取已检查的广播：

foreach (Control c in groupBox1.Controls)
            {
                if (c.GetType() == typeof(RadioButton))
                {
                    RadioButton rb = c as RadioButton;
                    if (rb.Checked)
                    {
                       //here you can either store the checked radio button in a variable to further check the color you need to set, or do the logic here.
                    }
                }
            }
}

您的整个代码可能是这样的：

private void Form1_Load（object sender，EventArgs e） { label1.Text =“Pazartesi”;

    }

    private void numericUpDown1_ValueChanged(object sender, EventArgs e)
    {
        byte sayi = Convert.ToByte(numericUpDown1.Value);


        switch (sayi)
        {
            case 1:
                label1.Text="Pazartesi";
                break;
            case 2:
                label1.Text="Salı";
                break;
            case 3:
                label1.Text = "Çarşamba";
                break;
            case 4:
                label1.Text = "Perşembe";
                break;
            case 5:
                label1.Text = "Cuma";
                break;
            case 6:
                label1.Text = "Cumartesi";
                break;
            case 7:
                label1.Text = "Pazar";
                break;
        }
        RadioButton selectedRadio = GetSelectedRadioButton();

        switch(selectedRadio.Name)
        { 
           case rankbtn_1.Name:
                this.BackColor = Color.Red;
                break;
           case rankbtn_2.Name:
                this.BackColor = Color.White;
                break;

           //Repeat for the other buttons.
        }

   }

   private RadioButton GetSelectedRadioButton()
   {
                foreach (Control c in groupBox1.Controls)
            {
                if (c.GetType() == typeof(RadioButton))
                {
                    RadioButton rb = c as RadioButton;
                    if (rb.Checked)
                    {
                       return rb;
                    }
                }
            }
   }

仅使用开关盒，使用单选按钮更改背景色

2 个答案: