splash.cs

微软的行业应用解决方案实例！非常优秀的Windows Mobile开发案例

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.Data.SqlServerCe;

namespace HardwareDistributor.UI
{
    /// <summary>
    /// UI form that loads config data, syncs database, and performs 
    /// other work before launching the Logon screen
    /// </summary>
    public partial class Splash : Form
    {
        private bool appLoaded;

        public Splash()
        {
            InitializeComponent();
        }


        /// <summary>
        /// Load Splash Screen
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Splash_Load(object sender, EventArgs e)
        {
            //Set this variable to false so that the Activated event
            //will perform its work since this is the first time
            //this screen has been activated
            appLoaded = false;
        }


        /// <summary>
        /// The Activated Event is used to kick off the execution of
        /// Splash Screen code since it doesn't fire until after the
        /// screen is drawn and visible.  
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Splash_Activated(object sender, EventArgs e)
        {
            //If this is the first time this form has been 
            //Activated, then execute the following code
            if (appLoaded == false)
            {
                try
                {
                    //Load Wait Cursor
                    Application.DoEvents();
                    Cursor.Current = Cursors.WaitCursor;
                    Application.DoEvents();

                    //Load device and application data
                    Business.Services.LoadDeviceData();

                    //Load configuration information from config file
                    Application.DoEvents();
                    statusBar1.Text = "Loading configuration data...";
                    Application.DoEvents();
                    Business.Services.LoadAppSettings();

                    //Check to see if Local Database Exists
                    Application.DoEvents();
                    statusBar1.Text = "Searching for local database...";
                    Application.DoEvents();
                    System.Threading.Thread.Sleep(500);
                    //If database doesn't exist
                    if (!Business.Services.DatabaseExists())
                    {
                        //Test to see if Network is available
                        Application.DoEvents();
                        statusBar1.Text = "Checking network connectivity...";
                        Application.DoEvents();
                        if (Business.Services.GetConnectionStatus())
                        {
                            //Test to see if Replication URL is reachable
                            Application.DoEvents();
                            statusBar1.Text = "Testing IIS server...";
                            Application.DoEvents();
                            if (Business.Services.CheckReplicationUrl())
                            {
                                //Synchronize and pull down new database
                                Application.DoEvents();
                                statusBar1.Text = "Synchronizing database...";
                                Application.DoEvents();
                                Business.Services.SyncWithDataSource();
                            }
                            else
                            {
                                //Replication URL isn't reachable
                                Application.DoEvents();
                                statusBar1.Text = "Replication server isn't available...";
                                Application.DoEvents();
                                System.Threading.Thread.Sleep(1000);
                                Application.DoEvents();
                                statusBar1.Text = "Shutting down...";
                                Application.DoEvents();
                                System.Threading.Thread.Sleep(1000);
                                Application.DoEvents();
                                this.Close();
                                return;
                            }
                        }
                        else
                        {
                            //Network isn't available
                            Application.DoEvents();
                            statusBar1.Text = "Network isn't available...";
                            Application.DoEvents();
                            System.Threading.Thread.Sleep(1000);
                            Application.DoEvents();
                            statusBar1.Text = "Shutting down...";
                            Application.DoEvents();
                            System.Threading.Thread.Sleep(1000);
                            Application.DoEvents();
                            this.Close();
                            return;
                        }
                    }

                    //Database exists so create connection and add to GlobalCache
                    Application.DoEvents();
                    statusBar1.Text = "Creating database connection...";
                    Application.DoEvents();
                    Business.Services.CacheDataSourceConnection();

                    //Load and cache Customers Collection
                    Business.GlobalCache.Instance.Customers = Business.Services.GetCustomers();

                    //Load Default Cursor
                    Application.DoEvents();
                    Cursor.Current = Cursors.Default;
                    Application.DoEvents();

                    //Set to true to prevent the Activate
                    //Event from executing code in the future
                    appLoaded = true;

                    //Database has been created so load the Logon Screen
                    Logon logon = new Logon();
                    logon.ShowDialog();

                    //When the user selects exit from the logon screen
                    //this splash screen and the rest of the app will close
                    this.Close();
                }
                catch (SqlCeException sqlEx)
                {
                    Business.Services.LogErrors(sqlEx);
                    //This error means SQL Server can't be found
                    if (sqlEx.NativeError == 29061)
                    {
                        Application.DoEvents();
                        statusBar1.Text = "SQL Server unavailable...";
                        Application.DoEvents();

                        //Delete corrupt local database
                        if (Business.Services.DatabaseExists())
                        {
                            Business.Services.DeleteDatabase();
                        }
                    }
                    else
                    {
                        Application.DoEvents();
                        statusBar1.Text = "Database initialization error...";
                        Application.DoEvents();
                    }
                    System.Threading.Thread.Sleep(2000);
                    Application.DoEvents();
                    statusBar1.Text = "Shutting down...";
                    Application.DoEvents();
                    System.Threading.Thread.Sleep(2000);
                    Application.DoEvents();
                    this.Close();
                }
                catch (Exception ex)
                {
                    Business.Services.LogErrors(ex);
                    Application.DoEvents();
                    statusBar1.Text = "Error initializing system";
                    Application.DoEvents();
                    System.Threading.Thread.Sleep(2000);
                    Application.DoEvents();
                    statusBar1.Text = "Shutting down...";
                    Application.DoEvents();
                    System.Threading.Thread.Sleep(2000);
                    Application.DoEvents();
                    this.Close();
                }
            }
        
        }

        

    }
}