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   源码介绍

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还不错啊,记账助手

using System;
using System.Windows.Forms;
using System.Data.SQLite;
using System.IO;
using System.ComponentModel;

namespace AccountBook.ForSingle
{
    public partial class Splash : Form
    {
        private static readonly string dbName = "AccountBookforSingle.db";

        private static Splash _instance;
        public static Splash Instance
        {
            get
            {
                if (_instance == null)
                {
                    _instance = new Splash();
                }
                return _instance;
            }
        }

        private Timer _ticker;
        public Timer Ticker
        {
            get
            {
                if (_ticker == null)
                {
                    _ticker = new Timer(this.components);
                    _ticker.Interval = 2000;
                    _ticker.Tick  = new System.EventHandler(_ticker_Tick);
                }
                return _ticker;
            }
        }

        private enum DBStateEnum
        {
            Undefined,
            Ready,
            Failed
        }

        private DBStateEnum _dbState = DBStateEnum.Undefined;
        private DBStateEnum DBState
        {
            get { return _dbState; }
            set { _dbState = value; }
        }

        private void _ticker_Tick(object sender, System.EventArgs e)
        {
            if (DBState == DBStateEnum.Ready)
            {
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            else if (DBState == DBStateEnum.Failed)
            {
                if (string.IsNullOrEmpty(this.lblMessage.Text))
                {
                    this.lblMessage.Text = ErrorMessage;
                }
                else
                {
                    this.DialogResult = DialogResult.Cancel;
                    this.Close();
                }
            }
        }

        private BackgroundWorker _worker;
        private BackgroundWorker Worker
        {
            get 
            {
                if (_worker == null)
                {
                    _worker = new BackgroundWorker();
                    _worker.DoWork =new DoWorkEventHandler(_worker_DoWork);
                }
                return _worker;
            }

        }

        private void _worker_DoWork(object sender, DoWorkEventArgs e)
        {
            CheckDBConnection();
        }

        private Splash()
        {
            InitializeComponent();
            SetDialogInfo();
            Ticker.Start();
            Worker.RunWorkerAsync();
        }

        private string _errorMessage;
        private string ErrorMessage
        {
            get { return _errorMessage; }
            set { _errorMessage = value; }
        }

        private void CheckDBConnection()
        {
            string basePath = System.AppDomain.CurrentDomain.BaseDirectory;
            string dbPath = Path.Combine(basePath, dbName);
            try
            {
                if (!File.Exists(dbPath))
                {
                    SQLiteConnection.CreateFile(dbPath);
                }

                GlobalContext.connString = string.Format("Data Source={0};", dbPath);
                using (SQLiteConnection conn = new SQLiteConnection(GlobalContext.connString))
                {
                    conn.Open();
                    if (conn.GetSchema("Tables").Select(string.Format("Table_Name = '{0}'","AccountRecord")).Length == 0)
                    {
                        using(SQLiteCommand cmd = new SQLiteCommand(createAccountRecordSql, conn))
                        {
                            cmd.ExecuteNonQuery();
                        }
                    }
                    conn.Close();
                }
                DBState = DBStateEnum.Ready;
            }
            catch (Exception)
            {
                ErrorMessage = "连接本地数据库失败";
                DBState = DBStateEnum.Failed;
            }
        }

        private static readonly string createAccountRecordSql = 
            @"create table AccountRecord
            (
              RecordID integer primary key autoincrement,
              ConsumeDate datetime not null default(datetime('now','localtime')),
              ConsumeAmount decimal(10,2) not null,
              Category nchar(4) not null,
              SubCategory nvarchar(32)
            );";

        private void SetDialogInfo()
        {
            lblVer.Text = string.Format("Ver: {0}", Application.ProductVersion);
            lblBy.Text = string.Format("By:   {0}", "chen wu");
        }


    }
}