Question

我遇到了一个问题，即计算方法不断返回结果的默认值，而该方法似乎无法读取表单中的运算符输入。

有人知道我做错了吗？

这是我的代码：

namespace Prac5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {
            try
            {
                decimal Operand1 = Convert.ToDecimal(txtOperand1.Text);
                decimal Operand2 = Convert.ToDecimal(txtOperand2.Text);
                string Operator = Convert.ToString(txtOperator);

                if ((Operand1 <= 1000000 && Operand1 >= 1) && (Operand2 <= 1000000 && Operand2 >= 1))
                {                   
                    decimal Result = Calculation(Operand1, Operand2, Operator);
                    Result = Math.Round(Result, 4);
                    txtResult.Text = Result.ToString();                  
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message + "\n\n" +
                ex.GetType().ToString() + "\n" +
                ex.StackTrace, "Exception");
            }         
        }

        private decimal Calculation(decimal Operand1, decimal Operand2, string Operator)
        {           
            decimal Result = 0;
            switch (Operator = Convert.ToString(txtOperator))
            {
                case "+":
                    return Result = Operand1 + Operand2;
                case "-":
                    return Result = Operand1 - Operand2;
                case "*":
                    return Result = Operand1 * Operand2;
                case "/":
                    return Result = Operand1 / Operand2;
                default:
                    return Result;
            }
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}

Answer 1

当操作员离开文本框时，您正在尝试将文本框转换为字符串而不是文本。

string Operator = Convert.ToString(txtOperator);

应该是

string Operator = txtOperator.Text;

计算方法不读取输入

1 个答案: