为什么子窗体在SHOW时会出现创建窗体句柄出错

Question

为什么子窗体在SHOW时会出现创建窗体句柄出错
Issue.MdiParent = this;
Issue.Dock = DockStyle.Fill;
Issue.Show();

Answer 1

  IntPtr MainHandle;
        Message MainMessge;        frmIssue  Issue;
        frmLogout Logout;
        frmICAdd  ICAdd;
        public frmICOpr(IntPtr HandleTmp)
        {
            InitializeComponent();            MainHandle = HandleTmp;            Global.SysPara.ShowOne.IsICOpr = true;
        }        public frmICOpr(System.Windows.Forms.Message m,IntPtr HandleTmp)
        {
            InitializeComponent();            MainMessge = m;
            MainHandle = HandleTmp;            Global.SysPara.ShowOne.IsICOpr = true;
        }

Answer 2

        private void frmICOpr_Load(object sender, EventArgs e)
        {
            TAdo   AdoPort;            ICOprs.eICOpr eOrder;            eOrder  = ICOprs.eICOpr.eNone;            Global.UnregisterHotKey(MainHandle, Global.HOTKEYF2);
            Global.UnregisterHotKey(MainHandle, Global.HOTKEYF3);
            Global.UnregisterHotKey(MainHandle, Global.HOTKEYF4);
            Global.UnregisterHotKey(MainHandle, Global.HOTKEYF5);            Global.RegisterHotKey(Handle.ToInt32(), Global.HOTKEYF2, 0, Global.VK_F2);
            Global.RegisterHotKey(Handle.ToInt32(), Global.HOTKEYF3, 0, Global.VK_F3);
            Global.RegisterHotKey(Handle.ToInt32(), Global.HOTKEYF4, 0, Global.VK_F4);
            Global.RegisterHotKey(Handle.ToInt32(), Global.HOTKEYF5, 0, Global.VK_F5);
        
            AdoPort = new TAdo(Global.SysPara.sDataSrc, "Manage10", Global.SysPara.sUser, Global.SysPara.sKey);            if (Global.SysPara.tOper.IsIssue || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabIssue.Visible = true;                //Issue = new frmIssue();
            }            if (Global.SysPara.tOper.IsLogOut || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabLogOut.Visible = true;                Logout = new frmLogout();
            }            if (Global.SysPara.tOper.IsCAddMoney || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabAddMoney.Visible = true;                //ICAdd = new frmICAdd();
            }            if (Global.SysPara.tOper.IsFunCard || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabIssueFun.Visible = true;
            }            if (Global.SysPara.tOper.IsNightCard || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabIssueNight.Visible = true;
            }            if (Global.SysPara.tOper.IsLost || Global.SysPara.tOper.IsReissue 
                || Global.SysPara.tOper.IsBackMoney || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabLoss.Visible = true;
            }            if (Global.SysPara.tOper.IsCancelLost || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabCancelLoss.Visible = true;
            }            if (Global.SysPara.tOper.IsRoam || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabRoam.Visible = true;
            }            if (Global.SysPara.tOper.IsCardRise || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabCardRise.Visible = true;
            }            if (Global.SysPara.tOper.IsAutoRise || Global.SysPara.tOper.IsAdmin || Global.SysPara.IsBoss)
            {
                TabAutoRise.Visible = true;
            }            if (TabIssue.Visible)
            {
                eOrder = ICOprs.eICOpr.Issue;                TabICOPr.SelectedTab = TabIssue;                TabIssue_Click(sender, e);
            }
            else if (TabLogOut.Visible)
            {
                eOrder = ICOprs.eICOpr.LogOut;                TabICOPr.SelectedTab = TabLogOut;
            }
            else if (TabAddMoney.Visible)
            {
                eOrder = ICOprs.eICOpr.AddMoney;                TabICOPr.SelectedTab = TabAddMoney;
            }
            else if (TabIssueFun.Visible)
            {
                eOrder = ICOprs.eICOpr.IssueFun;                TabICOPr.SelectedTab = TabIssueFun;
            }
            else if (TabIssueNight.Visible)
            {
                eOrder = ICOprs.eICOpr.IssueNight;                TabICOPr.SelectedTab = TabIssueNight;
            }
            else if (TabLoss.Visible)
            {
                eOrder = ICOprs.eICOpr.Loss;                TabICOPr.SelectedTab = TabLoss;
            }
            else if (TabCancelLoss.Visible)
            {
                eOrder = ICOprs.eICOpr.CancelLost;                TabICOPr.SelectedTab = TabCancelLoss;
            }
            else if (TabRoam.Visible)
            {
                eOrder = ICOprs.eICOpr.Roam;                TabICOPr.SelectedTab = TabRoam;
            }
            else if (TabCardRise.Visible)
            {
                eOrder = ICOprs.eICOpr.CardRise;                TabICOPr.SelectedTab = TabCardRise;
            }
            else if (TabAutoRise.Visible)
            {
                eOrder = ICOprs.eICOpr.AutoRise;                TabICOPr.SelectedTab = TabAutoRise;
            }
            else if (TabIDBand.Visible)
            {
                eOrder = ICOprs.eICOpr.IDBand;                TabICOPr.SelectedTab = TabIDBand;
            }            if (MainMessge.HWnd.ToInt32() != 0)
            {
                DefWndProc(ref MainMessge);
            }
        }        private void frmICOpr_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (MainHandle.ToInt32() != 0)
            {
                Global.UnregisterHotKey(this.Handle, Global.HOTKEYF2);
                Global.UnregisterHotKey(this.Handle, Global.HOTKEYF3);
                Global.UnregisterHotKey(this.Handle, Global.HOTKEYF4);
                Global.UnregisterHotKey(this.Handle, Global.HOTKEYF5);                Global.SendMessage(MainHandle.ToInt32(), Global.WM_CLOSEICPOR, 0, 0);                Global.SendMessage(MainHandle.ToInt32(), Global.WM_BANDDING, 0, 0);
            }            Global.SysPara.ShowOne.IsICOpr = false;            ICOpr.CloseCom();
        }
        private void ChkHide()
        {
            Issue.Hide();
            //Logout.Hide();
            //ICAdd.Hide();
        }        //private bool GetInstanceState(string name)
        //{
        //    int l = this.MdiChildren.Length;
        //    for (int i = 0; i < l; i++)
        //    {
        //        if (this.MdiChildren[i].Name == name)
        //        {
        //            this.MdiChildren[i].Focus();
        //            return true;
        //        }
        //    }
        //    return false;
        //}        private void TabIssue_Click(object sender, EventArgs e)
        {
            try
            {
                //ChkHide();
                //Issue = new frmIssue();
                //Issue.MdiParent = this;
                //Issue.Dock = DockStyle.Fill;
                //Issue.Show();
            }
            catch(Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }        private void TabLogOut_Click(object sender, EventArgs e)
        {
            //ChkHide();
            Logout.MdiParent = this;
            Logout.Dock = DockStyle.Fill;            Logout.Show();            //Global.SendMessage(Global.SysPara.iLogoutWnd, Global.WM_OPENTIMER, 0, 0);
        }        private void TabAddMoney_Click(object sender, EventArgs e)
        {
            //ChkHide();
            //ICAdd.MdiParent = this;
            //ICAdd.Dock = DockStyle.Fill;
           
            //ICAdd.Show();            //Global.SendMessage(Global.SysPara.iAddMoneyWnd, Global.WM_OPENTIMER, 0, 0);
        }

Answer 3

//Issue = new frmIssue(); （实例化了）
        
private void TabIssue_Click(object sender, EventArgs e) 
        { 
            try 
            { 
                //ChkHide(); 
                //Issue = new frmIssue(); 
                //Issue.MdiParent = this; 
                //Issue.Dock = DockStyle.Fill; 
                //Issue.Show(); 
            } 
            catch(Exception err) 
            { 
                MessageBox.Show(err.Message); 
            } 
        } 
不知道为什么有创建窗体句柄出错

Answer 4

我是使用的第三方控件，我发现只要设成MDI窗体就有问题，
我现在想到的解决办法就是控制窗体的显示位置，看上去也象是MDI模式的，谢谢各位了。