Question

C#做一个计算器出现了字符串输入的格式不正确，求解答~附代码~~~

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 计算器{ public partial class 计算器 : Form { string x; public 计算器() { InitializeComponent(); } private void button4_Click(object sender, EventArgs e) { } private void button1_Click(object sender, EventArgs e) { Double num1 = Convert.ToDouble(this.textBox1.ToString()); Double num2 = Convert.ToDouble(this.textBox2.ToString()); string ch = x; String Result = ""; switch (ch) { case "+": Result = (num1 + num2).ToString(); this.textBox3.Text = Result; break; case "-": Result = (num1 - num2).ToString(); this.textBox3.Text = Result; break; case "*": Result = (num1 * num2).ToString(); this.textBox3.Text = Result; break; case "/": Result = (num1 / num2).ToString(); this.textBox3.Text = Result; break; default: break; } } private void button2_Click(object sender, EventArgs e) { Application.Exit(); } private void 计算器_Load(object sender, EventArgs e) { } private void label3_Click(object sender, EventArgs e) { } private void radioButton3_CheckedChanged(object sender, EventArgs e) { x = "+"; } private void button3_Click(object sender, EventArgs e) { this.textBox1.Clear(); this.textBox2.Clear(); this.textBox3.Clear(); } private void textBox3_TextChanged(object sender, EventArgs e) { } private void textBox1_TextChanged(object sender, EventArgs e) { } private void radioButton2_CheckedChanged(object sender, EventArgs e) { x = "-"; } private void radioButton1_CheckedChanged(object sender, EventArgs e) { x = "*"; } private void radioButton4_CheckedChanged(object sender, EventArgs e) { x = "/"; } }}

Answer 1

转成int类型就好，double没必要，而且，报错的地方你写成textbox直接转换了，要.一下出来text属性，这个属性才是你输入的字符的值，而这个属性本来就是string的，无需tostring()

Answer 2

取textBox1.Text.ToString(); textBox2也一样。