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

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

        private void btnJiSuan_Click(object sender, EventArgs e)
        {
            int y, m, d, sum;
            y = int.Parse(txtYear.Text);
            m = int.Parse(txtMonth.Text);
            d = int.Parse(txtDays.Text);
                                                                        
            if (y < 1 || y > 9999)
            {
                txtXianShi.Text = "你输入的年份不正确！请重新输入！";
                txtYear.Text = "";
                txtYear.Focus();
               }
                else if (m < 1 || m > 12)
                {
                txtXianShi.Text = "你输入的月份不正确！请重新输入！";
                txtMonth.Text = "";
                txtMonth.Focus();
               
                }
                else {
                     switch (m) {
                        case 2:
                            if ((y % 100 != 0 && y % 4 == 0) || (y % 400 == 0)) {
                                if (d < 1 || d > 29) {
                                    txtXianShi.Text = "你输入的天数不正确！请重新输入！";
                                    txtDays.Text = "";
                                    txtDays.Focus();
                           
                            }
                        } break;
                         case 4:case 6:case 9:case 11:
                             if (d < 1 || d > 30) {
                                 txtXianShi.Text = "";
                                 txtDays.Text = "";
                                 txtDays.Focus();
                             
                             } break;
                         default:
                             if (d < 1 || d > 31) {
                                txtXianShi.Text = "你输入的天数不正确！请重新输入！";
                                 txtDays.Text = "";
                                 txtDays.Focus();
                              
                             }
                             break;
                }
                if (m == 1 || m == 2) {
                    sum = (m - 1) * 31 + d; }
                    else {
                        switch (m) {
                            case 9:case 11:
                                sum = (m - 1) * 30 + d - 2 + m / 2 + 1;
                                break;
                            default:
                                sum = (m - 1) * 30 + d - 2 + m / 2;
                                break;
                        } if ((y % 100 != 0 && y % 4 == 0) || (y % 400 == 0)) {
                            sum = sum + 1;
                           }
                           txtXianShi.Text = y + "年" + m + "月" + d + "日是" + y + "年的第" + sum + "天";
                    }
                    
            }

        }
    }
} goto方法不会用，知道怎么用，还有其他更好的办法来

1月和2月不对应显示输出txtXianShi.Text = y + "年" + m + "月" + d + "日是" + y + "年的第" + sum + "天";

if (m == 1 || m == 2) {
                    sum = (m - 1) * 31 + d; }
                   else {}-->去掉既可.
因为一旦m=1或者m=2那么它执行完 sum = (m - 1) * 31 + d; 后。不会再往下执行
if(){}else{}--->如果满足则执行if(){执行这代码}-->(否则)else{执行这}

[ 本帖最后由 gameohyes 于 2010-3-19 23:17 编辑 ]

你先看下源码。不懂提问。
我先下了.--->最好的解决问题方法:---->调试-->

时间最好不要让客户去输入，变成可选控制比较好。

不道德有木马

...不知怎么说..................

我用的360没报毒。我系统也稳定.
    如你那真报毒,那对不起。
   

[ 本帖最后由 gameohyes 于 2010-3-21 18:22 编辑 ]