Question

namespace exer4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnTotal_Click(object sender, EventArgs e)
        {
            int overtime = Convert.ToInt32(txtHours.Text) - 30;
            int salary = Convert.ToInt32(txtHours.Text)*250;
            double tax = (salary + overtime) * .10;
            int deduction = salary - (300 + 400);

            //operator '>' cannot be applied to operands of type 'string' and 'int'
            if Convert.ToInt32(txtHours.Text > 30)
            {
                lblName.Text = txtName.Text;
                lblSalary.Text = Convert.ToString(overtime *120) + (salary - (deduction - tax)); 


            }
            else
            { 
                // //operator '*' cannot be applied to operands of type 'string' and 'int'
                lblSalary.Text = Convert.ToString(txtHours.Text) * 250;
            }
       }
  }

Answer 1

你的if语句应该是

if (Convert.ToInt32(txtHours.Text) > 30)

另一行应该是

lblSalary.Text = Convert.ToString(Convert.ToInt32(txtHours.Text) * 250);

或者更好的是将txtHours文本转换为int并将其保存在变量中以便重用。

    private void btnTotal_Click(object sender, EventArgs e)
    {
        int hours = Convert.ToInt32(txtHours.Text);
        int overtime = hours - 30;
        int salary = hours * 250
        double tax = (salary + overtime) * .10;
        int deduction = salary - (300 + 400);

        if(hours > 30)
        {
            lblName.Text = txtName.Text;
            lblSalary.Text = ((overtime *120) + (salary - (deduction - tax))).ToString(); 
        }
        else
        { 
            lblSalary.Text = salary.ToString();
        }
   }

Answer 2

你想这样做：

if (Convert.ToInt32(txtHours.Text) > 30)
{
    //normal code here
}
else
{
    //normal code
}

如果首先需要像往常一样将其解析为int，那么进行比较，以便if可以测试布尔条件。

Answer 3

尝试

if (Convert.ToInt32(txtHours.Text) > 30)
{ ...

运算符'*'不能应用于'string'和'int'类型的操作数

3 个答案: