AddForm.cs

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

namespace FamilyFinance
{
    public partial class AddForm : Form
    {
        DBhelper dbh = new DBhelper();
        public AddForm()
        {
            InitializeComponent();
        }

        private void AddForm_Load(object sender, EventArgs e)
        {
            //加载年月日
            for (int i = 1970; i < 2060; i++) //年
            {
                cmbYear.Items.Add(i);
            }
            for (int i = 1; i < 13; i++) //月
            {
                cmbMonth.Items.Add(i);
            }
            for (int i = 1; i < 32; i++) //日
            {
                cmbDay.Items.Add(i);
            }
            //默认选中当天的日期
            DateTime dt = DateTime.Today;
            DateTime dt2 = DateTime.Now; //上列写法一样 

            cmbYear.SelectedItem =  dt.Year;
            cmbMonth.SelectedItem =dt.Month;
            cmbDay.SelectedItem = dt.Day;
           

            //加载类型，收支项目初始值
            cmbCategory.Items.Add("收入");
            cmbCategory.Items.Add("支出");
            cmbCategory.SelectedIndex = 0;
            //cmbItem.SelectedIndex = 0;
        }

        private void cmbCategory_SelectedIndexChanged(object sender, EventArgs e)
        {


            if (Convert.ToString(cmbCategory.SelectedItem) == "收入")
            {
                cmbItem.Items.Clear();
                cmbItem.Items.Add("薪水");
                cmbItem.Items.Add("软件销售");