form1.cs

Visual C#2005程序设计教程

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinApp4_４个人所得税
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            decimal pay = (decimal)int.Parse(txtPay.Text);
            decimal tax = 0;
            decimal tax1 = (2100 - 1600) * 0.05m;
            decimal tax2 = tax1 + (3600 - 2100) * 0.1m;
            decimal tax3 = tax2 + (6600 - 3600) * 0.15m;
            /* 
            decimal tax4 = tax3 + (21600 - 6600) * 0.2m;
            decimal tax5 = tax4 + (41600 - 21600) * 0.25m;
            decimal tax6 = tax5 + (61600 - 41600) * 0.30m;
            decimal tax7 = tax6 + (81600 - 61600) * 0.35m;
            decimal tax8 = tax7 + (101600 - 81600) * 0.4m;*/
            if (pay > 20000)
            {
                MessageBox.Show("请输入20000以内的数！");
                return;
            }
            if (pay <= 1600)
                tax = 0m;
            else if (pay <= 2100)
                tax = (pay - 1600) * .05m;
            else if (pay <= 3600)
                tax = tax1 + (pay - 2100) * .1m;
            else if (pay <= 6600)
                tax = tax2 + (pay - 3600) * .15m;
            else if (pay <= 21600)
                tax = tax3 + (pay - 6600) * .2m;
            /* 
            else if (pay <= 41600)
                tax = tax4 + (pay - 21600) * .25m;
            else if (pay <= 61600)
                tax = tax5 + (pay - 41600) * .3m;
            else if (pay <= 81600)
                tax = tax6 + (pay - 61600) * .35m;
            else if (pay <= 101600)
                tax = tax7 + (pay - 81600) * .4m;
            else
                tax = tax8 + (pay - 101600) * .45m;*/
            txtTax.Text = tax.ToString( );
        }
    }
}