2

在 C# 中，我遇到了启动画面的问题。当需要关闭并且主 Form1 出现时，它会移动到 Form1 的右上角。然后消失。我以前从未发生过这种情况，并且几乎没有解决它的想法。我希望启动画面消失在中央屏幕中，而不是移动到打开 Form1 的上角。这是代码：

public Form1() {
    Splash mySplash = new Splash();
    mySplash.TotalValue = 7; //or however many steps you must complete
    mySplash.Show();
    mySplash.Update();
    InitializeComponent();

    //--<begin>--------------
    this.Hide();
    this.WindowState = FormWindowState.Normal;
    mySplash.Progress++;
    printDoc.PrintPage += new PrintPageEventHandler(printDoc_PrintPage);
    printBOM.PrintPage += new PrintPageEventHandler(printBOM_PrintPage);
    printList.PrintPage += new PrintPageEventHandler(printList_PrintPage);
    mySplash.Progress++;

    // using old Kodak Imaging OCX !
    axImgEdit1.Image = "\\\\Netstore\\eng_share\\EView\\BOB-eView9.tif";
    axImgEdit1.DisplayScaleAlgorithm = 
        ImgeditLibCtl.DisplayScaleConstants.wiScaleOptimize;
    axImgEdit1.FitTo(0);
    axImgEdit1.Display();
    mySplash.Progress++;

    //~~~~~~~~~~~~~~~~~~~~Getting printer info~~~~~~~~~~~~~~~~~~~~~~~~~

    List<Win32_Printer> printerList = Win32_Printer.GetList();
    int i = 0;
    foreach (Win32_Printer printer in printerList) {
        prnName = printer.Name;
        prnPort = printer.PortName;
        prnDriver = printer.DriverName;

        if (i == 0) {
            prnNameString = prnName;
            prnDriverString = prnDriver;
            prnPortString = prnPort;
        }

        else {
            prnNameString += "," + prnName;
            prnDriverString += "," + prnDriver;
            prnPortString += "," + prnPort;
        }

        i++;
    }

    mySplash.Progress++;
    EViewMethods.defaultPrn[0] = Settings.Default.DefaultPrinter; //defaultPrn[] is 
    //string array holding the default printer name, driver and port

    EViewMethods.defaultPrn[1] = Settings.Default.DefaultPrinterDriver;
    EViewMethods.defaultPrn[2] = Settings.Default.DefaultPrinterPort;

    //making this printer the system default printer
    object printerName = Settings.Default.DefaultPrinter;
    ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM 
        Win32_Printer");
    ManagementObjectCollection collection = searcher.Get();

    foreach (ManagementObject currentObject in collection) {
        if (currentObject["name"].ToString() == printerName.ToString()) {
            currentObject.InvokeMethod("SetDefaultPrinter", new object[] { printerName 
        });
    }
}

mySplash.Progress++;
EViewMethods.reCenterEVafterDwgClose = Settings.Default.ReCenterEVafterDwgClose;
if (Settings.Default.ReCenterEVafterDwgClose == true)
    recenterEViewAfterDrawingViewerClosesToolStripMenuItem.Checked = true;

else
    recenterEViewAfterDrawingViewerClosesToolStripMenuItem.Checked = false;

    //-------------------------------------------------------
    EViewMethods.screenBehavior = Settings.Default.ViewStyle;
    normalToolStripMenuItem.Checked = false;
    clearViewToolStripMenuItem.Checked = false;
    clearviewDULevLRToolStripMenuItem.Checked = false;
    clearviewdULevLLToolStripMenuItem.Checked = false;
    clearviewdURevULToolStripMenuItem.Checked = false;
    clearviewdURevLLToolStripMenuItem.Checked = false;
    clearviewdURevLRToolStripMenuItem.Checked = false;
    smallScreenToolStripMenuItem.Checked = false;

    switch (EViewMethods.screenBehavior) {
        case "Normal":
            normalToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(0, 0);
            //Settings.Default.FormEviewLocation = new 
            //Point(EViewMethods.form1CenterLeft, EViewMethods.form1CenterTop);
            Settings.Default.FormEviewLocation = new Point(588, 312);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = false;
            Form1.ActiveForm.SetDesktopLocation(588, 312);

        break;

        case "Clearview-dULevUR":
            clearViewToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(0, 0);
            Settings.Default.FormEviewLocation = new Point(1180, 0);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Clearview-dULevLR":
            clearviewDULevLRToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(0, 0);
            Settings.Default.FormEviewLocation = new Point(1180, 622);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Clearview-dULevLL":
            clearviewdULevLLToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(0, 0);
            Settings.Default.FormEviewLocation = new Point(0, 622);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Clearview-dURevUL":
            clearviewdURevULToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(825, 0);
            Settings.Default.FormEviewLocation = new Point(0, 0);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Clearview-dURevLL":
            clearviewdURevLLToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(825, 0);
            Settings.Default.FormEviewLocation = new Point(0, 622);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
                Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Clearview-dURevLR":
            clearviewdURevLRToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(825, 0);
            Settings.Default.FormEviewLocation = new Point(1180, 622);
            Settings.Default.FormECNLocation = new Point(EViewMethods.formECNLeft, 
                EViewMethods.formECNTop);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;

        case "Small-screen":
            //clearviewdURevLRToolStripMenuItem.Checked = true;
            smallScreenToolStripMenuItem.Checked = true;
            Settings.Default.FormViewDwgLocation = new Point(0, 0);
            Settings.Default.FormEviewLocation = new Point(0, 0);
            Settings.Default.FormECNLocation = new Point(0, 0);
            //EViewMethods.reCenterEVafterDwgClose = true;
            Form1.ActiveForm.SetDesktopLocation(588, 312);
        break;
    }

    //Form1.ActiveForm.SetDesktopLocation(588, 312); //all screen behavior mode will 
    //begin centered on the screen
    EViewMethods.eviewUserPrefLocation = Settings.Default.FormEviewLocation;
    //-------------------------------------------------------

    EViewMethods.syncListToDwgNum = Settings.Default.SyncListDwgNum;

    if (EViewMethods.syncListToDwgNum == true)
        synchronizeListToActiveDwgToolStripMenuItem.Checked = true;
    else
        synchronizeListToActiveDwgToolStripMenuItem.Checked = false;
        toolStripStatusLabel1.Text = "";
        toolStripStatusLabel2.Text = Settings.Default.ViewStyle;
        toolStripStatusLabel3.Text = Settings.Default.DefaultPrinter;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～ ~~~~~~~~~~~~~~~

    Assembly asm = Assembly.GetExecutingAssembly();
    AssemblyName asmName = asm.GetName();
    EViewMethods.eviewVersion = asmName.Version.ToString();
    radioPartInfo.Checked = true;
    disableAllSearch();
    EViewMethods.userName = Environment.UserName;
    EViewMethods.openConnection();
    mySplash.Progress++;
    EViewMethods.loadFavorites(listFavorites);
    mySplash.Close();
    mySplash.Dispose();
    this.Show();
    this.ActiveControl = comboEntry;

}

更精简的列表只显示更相关的代码：

public Form1() {
    Splash mySplash = new Splash();
    mySplash.TotalValue = 7; //or however many steps you must complete
    mySplash.Show();
    mySplash.Update();

    InitializeComponent();

    //--<begin>--------------
    this.Hide();
    this.WindowState = FormWindowState.Normal;
    mySplash.Progress++;

    ...

    mySplash.Progress++;

    ...

    mySplash.Progress++;

    //~~~~~~~~~~~~~~~~~~~~Getting printer info~~~~~~~~~~~~~~~~~~~~~~~~~
    List<Win32_Printer> printerList = Win32_Printer.GetList();

    ...

    mySplash.Progress++;

    ...

    mySplash.Progress++;

    EViewMethods.reCenterEVafterDwgClose = Settings.Default.ReCenterEVafterDwgClose;
    if (Settings.Default.ReCenterEVafterDwgClose == true)
        recenterEViewAfterDrawingViewerClosesToolStripMenuItem.Checked = true;
    else
        recenterEViewAfterDrawingViewerClosesToolStripMenuItem.Checked = false;

    //-------------------------------------------------------
    EViewMethods.screenBehavior = Settings.Default.ViewStyle;

    ...

    //Form1.ActiveForm.SetDesktopLocation(588, 312); //all screen behavior mode will 
    begin centered on the screen
    EViewMethods.eviewUserPrefLocation = Settings.Default.FormEviewLocation;

    //-------------------------------------------------------

    EViewMethods.openConnection();
    mySplash.Progress++;

    ...

    mySplash.Close();
    mySplash.Dispose();

    this.Show();
    this.ActiveControl = comboEntry;
}

飞溅代码：

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.Reflection;
using System.Threading;

namespace EView2 {
    public partial class Splash : Form {
        static int total = 100;
        static int currPos = 0;
        static string text;

        // Threading
        static Splash ms_frmSplash = null;
        static Thread ms_oThread = null;

        public Splash() {
            InitializeComponent();

            this.labelVersion.Text = 
                Assembly.GetExecutingAssembly().GetName().Version.ToString();
        }

        public int TotalValue {
            get {
                return total;
            }

            set {
                total = value;
                progressBar1.Maximum = total;
            }
        }

        public int Progress {
            get {
                return currPos;
            }

            set {
                currPos = value;

                try {
                    progressBar1.Value = currPos;
                }

                catch { 
                }
            }
        }

        static public void ShowSplashScreen() {
            // Make sure it's only launched once.
            if (ms_frmSplash != null)
                return;
                ms_oThread = new Thread(new ThreadStart(Splash.ShowForm));
                ms_oThread.IsBackground = true;
                ms_oThread.Start();
            }

            // A property returning the splash screen instance
            static public Splash SplashForm {
                get {
                    return ms_frmSplash;
                }
            }

            // A private entry point for the thread.
            static private void ShowForm() {
            ms_frmSplash = new Splash();
            Application.Run(ms_frmSplash);
        }
4

1 回答 1

1

我从 splash 中的多线程内容中看到，您似乎试图使启动屏幕运行得更顺畅，并且可能遇到了关于从与创建它的线程不同的线程更新表单属性的错误。
解决方法：
- 调用（看起来像复杂的代码，但实际上并没有那么糟糕）
- 启动线程中的 250 毫秒计时器，它从实例变量/属性中获取命令（hackish）

所以它一定是进度条无论如何都设法更新自己。如果您遇到问题，您总是可以在进度设置器中放入 me.refresh 。或者更新 pb 之后的 doevents，它实际上应该只在存在任何可见表单且没有控件可以引发您可能正在处理的事件（例如，单击）时使用，因为这将导致重入。

但这不是你问的。对不起。要在不重写的情况下修复该问题，请在关闭/处理启动画面之前添加此代码

MySplash.Visible = False
System.Windows.Forms.Application.DoEvents

如果我无法测试它来证明它，请原谅我，我缺少一个最简单的简化案例的脚本，它表明了加载和测试的问题（提示 - 在发布代码时总是这样做，50％的时间你找到这样做的错误，另外 50% 你实际上会让人们给你答案，因为许多人不会阅读过去的 2 个代码屏幕）。我也不保证不会导致应用程序出现在屏幕上的另一个窗口下出现问题，但你也没有问过这个问题 ;-)

于 2010-06-17T16:11:51.270 回答