WinForm界面開發之 啓動界面

咱們在開發桌面應用程序的時候，因爲程序啓動比較慢，每每爲了提升用戶的體驗，增長一個閃屏，也就是SplashScreen，好處有：一、讓用戶看到加載的過程，提升程序的交互響應；2.能夠簡短展現或者介紹程序的功能或者展現Logo，給客戶較深的印象。

本人在開發的共享軟件中，對於啓動比較慢的程序，也傾向於引入這個控件來展現下，先看看軟件啓動的時候的效果

中間的那些文字「正在初始化應用程序......」能夠根據加載的進度顯示不一樣的內容，固然最好簡單扼要了，其餘的內容你也能夠視須要作相應變化，由於這個是一個Form，你想改變什麼就改變什麼的。

看看閃屏代碼如何使用先，首先咱們在入口的Main函數中開始

    static class Program
    {
        /// <summary>
        /// 應用程序的主入口點。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

              
            //登錄界面
            FrmLogin dlg = new FrmLogin();
            dlg.StartPosition = FormStartPosition.CenterScreen;
            if (DialogResult.OK == dlg.ShowDialog())
            {
             
                   SplashScreen.Splasher.Show(typeof(SplashScreen.FrmSplashScreen));

                  Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
                  Application.Run(new FrmMain());
            }


           
        }

        private static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs ex)
        {
            //LogHelper.Error(ex.Exception);

            string message = string.Format("{0}\r\n操做發生錯誤，您須要退出系統麼？", ex.Exception.Message);
            if (DialogResult.Yes ==MessageBox.Show(message,"系統錯誤",MessageBoxButtons.YesNo))
            {
                Application.Exit();
            }
        }
    }

上面代碼中：SplashScreen.Splasher.Show(typeof(SplashScreen.frmSplash));主要爲啓動閃屏類代碼，

其中 Splasher 這個類當中使用後臺線程，反射來實例化窗體，代碼以下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Reflection;

namespace SplashScreen
{
    public class Splasher
    {
        private static Form m_SplashForm = null;
        private static ISplashForm m_SplashInterface = null;
        private static Thread m_SplashThread = null;
        private static string m_TempStatus = string.Empty;

        /// <summary>
        /// Show the SplashForm
        /// </summary>
        public static void Show(Type splashFormType)
        {
            if (m_SplashThread != null)
                return;
            if (splashFormType == null)
            {
                throw (new Exception("splashFormType is null"));
            }

            m_SplashThread = new Thread(new ThreadStart(delegate()
            {
                CreateInstance(splashFormType);
                Application.Run(m_SplashForm);
            }));

            m_SplashThread.IsBackground = true;
            m_SplashThread.SetApartmentState(ApartmentState.STA);
            m_SplashThread.Start();
        }



        /// <summary>
        /// set the loading Status
        /// </summary>
        public static string Status
        {
            set
            {
                if (m_SplashInterface == null || m_SplashForm == null)
                {
                    m_TempStatus = value;
                    return;
                }

                m_SplashForm.Invoke(
                        new SplashStatusChangedHandle(delegate(string str) { m_SplashInterface.SetStatusInfo(str); }),
                        new object[] { value }
                    );
            }

        }

        /// <summary>
        /// Colse the SplashForm
        /// </summary>
        public static void Close()
        {
            if (m_SplashThread == null || m_SplashForm == null) return;

            try
            {
                m_SplashForm.Invoke(new MethodInvoker(m_SplashForm.Close));
            }
            catch (Exception)
            {
            }
            m_SplashThread = null;
            m_SplashForm = null;
        }

        private static void CreateInstance(Type FormType)
        {

            //利用反射建立對象
            object obj = Activator.CreateInstance(FormType);

            m_SplashForm = obj as Form;
            m_SplashInterface = obj as ISplashForm;
            if (m_SplashForm == null)
            {
                throw (new Exception("Splash Screen must inherit from System.Windows.Forms.Form"));
            }
            if (m_SplashInterface == null)
            {
                throw (new Exception("must implement interface ISplashForm"));
            }

            if (!string.IsNullOrEmpty(m_TempStatus))
                m_SplashInterface.SetStatusInfo(m_TempStatus);
        }


        private delegate void SplashStatusChangedHandle(string NewStatusInfo);

    }
}

爲了增長啓動界面的說明，在啓動界面上增長了一個文字接口，能夠在外部來修改啓動界面上的說明:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SplashScreen
{
    /// <summary>
    /// interface for Splash Screen
    /// </summary>
    public interface ISplashForm
    {
        void SetStatusInfo(string NewStatusInfo);
    }
}

然手在閃屏的窗體上繼承接口，並實現相關的接口代碼：

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

namespace SplashScreen
{
    public partial class FrmSplashScreen : Form,ISplashForm
    {
        public FrmSplashScreen()
        {
            InitializeComponent();
        }

        //實現接口方法，主要用於接口的反射調用
        #region ISplashForm

        void ISplashForm.SetStatusInfo(string NewStatusInfo)
        {
            lbStatusInfo.Text = NewStatusInfo;
        }

        #endregion
    }
}

而後程序在點擊「登陸」按鈕後，就能夠在主界面上作閃屏界面等待了，frmMain窗體代碼：

namespace SplashScreen
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();

            System.Threading.Thread.Sleep(800);
            Splasher.Status = "正在展現相關的內容......";
            System.Threading.Thread.Sleep(800);

            //.......此處加載耗時的代碼

            Splasher.Status = "初始化完畢............";
            System.Threading.Thread.Sleep(800);

            Splasher.Close();

        }
    }
}