汽车信息查询系统实现-优快云博客

本文链接：https://blog.youkuaiyun.com/yvan2008/article/details/3573956

这是一个使用C#编写的汽车信息查询系统，通过DataSet和SqlDataAdapter从数据库获取数据。用户可以根据品牌、排量进行筛选，系统提供了加载数据、查询、重置和退出功能。在查询过程中，系统对可能出现的异常进行了捕获和处理。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

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

namespace Car
{
    public partial class frmCheck : Form
    {
        DataSet dataset;
        SqlDataAdapter dataAdapter;
        public frmCheck()
        {
            InitializeComponent();
        }
        private void frmCheck_Load(object sender, EventArgs e)
        {
            string sql = "SELECT CarsID,Brand,Type,Discharge,GearBox,OilUser,Price from CarsInfo";
            dataAdapter = new SqlDataAdapter(sql, DBHelper.connection);
            dataset = new DataSet("CarsManager");
            dataAdapter.Fill(dataset, "CarsInfo");
            dgvCheck.DataSource=dataset.Tables["CarsInfo"];
        }

        private void btnCheck_Click(object sender, EventArgs e)
        {
            if (cboType.Text.Trim()=="全部")
            {
                txtTrem.ReadOnly = true;
                dataset.Tables["CarsInfo"].Clear();
                string sql = "SELECT * FROM CarsInfo";
                try
                {
                    dataAdapter = new SqlDataAdapter(sql,DBHelper.connection);
                    DBHelper.connection.Open();
                    dataAdapter.Fill(dataset, "CarsInfo");
                    dgvCheck.DataSource=dataset.Tables["CarsInfo"];
                }
                catch(Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    DBHelper.connection.Close();
                }
            }
            if (cboType.Text.Trim() == "品牌")
            {
                txtTrem.ReadOnly=false;
                dataset.Tables["CarsInfo"].Clear();
                string sql = string.Format("SELECT * from CarsInfo where brand='{0}'",txtTrem.Text);

                try
                {
                    dataAdapter=new SqlDataAdapter(sql,DBHelper.connection);
                    DBHelper.connection.Open();
                    dataAdapter.Fill(dataset,"CarsInfo");
                    dgvCheck.DataSource=dataset.Tables["CarsInfo"];
                }
                catch(Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    DBHelper.connection.Close();
                }
            }
            if (cboType.Text.Trim()=="排量")
            {
                txtTrem.ReadOnly = false;
                dataset.Tables["CarsInfo"].Clear();
                string sql = string.Format("SELECT CarsID,Brand,Type,Discharge,GearBox,OilUser,Price from CarsInfo where Discharge='{0}'", txtTrem.Text);
                try
                {
                    dataAdapter=new SqlDataAdapter(sql,DBHelper.connection);
                    DBHelper.connection.Open();
                    dataAdapter.Fill(dataset,"CarsInfo");
                    dgvCheck.DataSource=dataset.Tables["CarsInfo"];
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
                finally
                {
                    DBHelper.connection.Close();
                }
            }
            else if (cboType.Text.Trim() == " ")
            {
                MessageBox.Show("请输入查询条件！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
            }
        }