c＃在關閉表單後更改按鈕的狀態？

-2

這是我的問題：我有一個主窗體，其中包含一些按鈕的面板，當用戶單擊按鈕時，表單打開（我有一些按鈕並單擊這些按鈕，用戶可以打開不同的窗體）用戶再次點擊相同的按鈕，他可以關閉表單。這就是我所做的：c＃在關閉表單後更改按鈕的狀態？

在主窗體中我有一個方法，當用戶點擊其中一個按鈕時調用該方法，該方法檢查與該按鈕相關的文本以決定哪個按鈕點擊。一旦我發現哪個按鈕被點擊了，它就會啓動與按鈕相關的表單。

這是代碼

private void tlStBtn_Click(object sender, EventArgs e) 
{ 
     //// loop through all items in the ToolStrip 
     //foreach (Object item in toolStripMain.Items) 
     //{ 
     // // if this item is a ToolStripButton object, check it 
     // if (item is ToolStripButton) 
     // { 
     //  // cast the item to a ToolStripButton object and check it if the sender of the event is the currently looked at button in the loop 
     //  ToolStripButton button = (ToolStripButton)item; 
     //  button.Checked = (button == sender); 
     // } 
     //} 

     foreach (ToolStripItem item in this.VerticalToolBox.Items) 
     { 
      if ((item != sender) && 
       (item is ToolStripButton)) 
      { 
       ((ToolStripButton)item).Checked = false; 
      } 
     } 

     if (sender_old != sender) 
     { 
      sender_old = sender; 
      if ((sender as ToolStripButton).Text == "Protection") 
      { 
       if (!Application.OpenForms.OfType<frm_Protection>().Any()) 
       { 
        frm_Protection Newf = new frm_Protection(ref CurrentProject); 
        Newf.Show(); 

       } 
      } 
      else 
      { 
       if (Application.OpenForms.OfType<frm_Protection>().Any()) 
       { 
        Application.OpenForms.OfType<frm_Protection>().First().Close(); 
        Properties.Settings.Default.Save(); 
       } 
       GC.Collect(); 
       GC.WaitForPendingFinalizers(); 
      } 

       if ((sender as ToolStripButton).Text == "Info") 
       { 
        if (!Application.OpenForms.OfType<Frm_ObjectInfo>().Any()) 
        { 
         Frm_ObjectInfo Newform = new Frm_ObjectInfo(); 
         Newform.Show(); 
        } 
       } 
       else 
       { 
        if (Application.OpenForms.OfType<Frm_ObjectInfo>().Any()) 
        { 
         Application.OpenForms.OfType<Frm_ObjectInfo>().First().Close(); 
         Properties.Settings.Default.Save(); 
        } 

        GC.Collect(); 
        GC.WaitForPendingFinalizers(); 
       } 

      if ((sender as ToolStripButton).Text == "Layers") 
      { 
       if (!Application.OpenForms.OfType<Frm_LayersManage>().Any()) 
       { 
        Frm_LayersManage Newform = new Frm_LayersManage(); 
        Newform.Show(); 
        Application.OpenForms.OfType<Frm_LayersManage>().First().UpdateLayers(null, CurrentProject.layers); 
       } 
      } 
      else 
      { 
       if (Application.OpenForms.OfType<Frm_LayersManage>().Any()) 
       { 
        Application.OpenForms.OfType<Frm_LayersManage>().First().Close(); 
        Properties.Settings.Default.Save(); 
        UpdateScreen = true; 
       } 

       GC.Collect(); 
       GC.WaitForPendingFinalizers(); 
      } 

      if (Properties.Settings.Default.Grip2Enabled && (sender as ToolStripButton).Text == "Insert Grip") 
      { 
       gbx_SelectGrip.Visible = true; 

      } 
      else 
      { 
       gbx_SelectGrip.Visible = false; 
      } 

      //SelectedPoints.Clear(); 
      //MousePointList.Clear(); 
      //myIDs.Clear(); 
      //IdxPointsEnt.Clear(); 
      //RatiosLines.Clear(); 
      //CadSource.cuts_tmp.Clear(); 
      //IDAddedCutList.Clear(); 
      //ZoomPort.SetValue(0, 0); 
      //ZoomPort.SetValue(0, 1); 
      //ZoomPort.SetValue(0, 2); 
      //ZoomPort.SetValue(0, 3); 

      //// Reset index of scrap selected by moving gripper 
      //idxScrap = -1; 
      //pnl_OpenTK.Refresh(); 

      //// Se ho evidenziato uno SCRAP , annullo l'evidenziazione. 
      //if (IdsScrapDisablePath[0] != -1) 
      //{ 
      // int identifiedScrap = CadSource.IdToIdx_Scrap(IdsScrapDisablePath[0]); 

      // if (CadSource.scraps[identifiedScrap].GripExists()) 
      // { 
      //  CadSource.scraps[identifiedScrap].Enabled = ScrapAbilitation.Enabled;  // Disable clicked scrap 
      // } 
      // else 
      // { 
      //  CadSource.scraps[identifiedScrap].Enabled = ScrapAbilitation.WithoutGrip;  // Disable clicked scrap 
      // } 
      //} 
      //numScrap = 0; 
      //IdsScrapDisablePath = new List<int>() { -1, -1 }; 

     } 
     else 
     { 
      (sender as ToolStripButton).Checked = false; 
      (sender as ToolStripButton).BackColor = Color.Transparent; 

      sender_old = new object() { }; 
      if (Application.OpenForms.OfType<frm_Protection>().Any()) 
      { 

       Application.OpenForms.OfType<frm_Protection>().First().Close(); 
       Properties.Settings.Default.Save(); 

      } 


      if (Application.OpenForms.OfType<Frm_ObjectInfo>().Any()) 
      { 
       Application.OpenForms.OfType<Frm_ObjectInfo>().First().Close(); 
       Properties.Settings.Default.Save(); 
      } 

      if (Application.OpenForms.OfType<Frm_LayersManage>().Any()) 
      { 
       Application.OpenForms.OfType<Frm_LayersManage>().First().Close(); 
       Properties.Settings.Default.Save(); 
      } 

      gbx_SelectGrip.Visible = false; 

      GC.Collect(); 
      GC.WaitForPendingFinalizers(); 
     } 

     SelectedPoints.Clear(); 
     MousePointList.Clear(); 
     myIDs.Clear(); 
     IdxPointsEnt.Clear(); 
     RatiosLines.Clear(); 
     CurrentProject.cuts_tmp.Clear(); 
     IDAddedCutList.Clear(); 
     ZoomPort.SetValue(0, 0); 
     ZoomPort.SetValue(0, 1); 
     ZoomPort.SetValue(0, 2); 
     ZoomPort.SetValue(0, 3); 

     // Reset index of scrap selected by moving gripper 
     idxScrap = -1; 
     pnl_OpenTK.Refresh(); 

     // Se ho evidenziato uno SCRAP , annullo l'evidenziazione. 
     if (IdsScrapDisablePath[0] != -1) 
     { 
      int identifiedScrap = CurrentProject.IdToIdx_Scrap(IdsScrapDisablePath[0]); 

      if (CurrentProject.scraps[identifiedScrap].GripExists()) 
      { 
       CurrentProject.scraps[identifiedScrap].Enabled = ScrapAbilitation.Enabled;  // Disable clicked scrap 
      } 
      else 
      { 
       CurrentProject.scraps[identifiedScrap].Enabled = ScrapAbilitation.WithoutGrip;  // Disable clicked scrap 
      } 
     } 
     numScrap = 0; 
     IdsScrapDisablePath = new List<int>() { -1, -1 }; 
    }

被opned點擊按鈕的形式是，我已經設置了控制盒的虛假形式，因爲我不希望用戶能夠關閉形式，而不點擊再次點擊打開它的按鈕，但我發現一個問題，因爲如果用戶以這種方式關閉窗體（請參閱下圖），該按鈕的狀態仍然被檢查，但窗體已被手動關閉

this is how the user can close the from manually

。如果我手動關閉窗體按鈕就變成假的再地位解決這個問題，我已經想添加關聯到我的形式在事件結束這種方法是這樣的代碼

private void frm_Protection_FormClosed(object sender, FormClosedEventArgs e) 
    { 
     ////// if user closes manually the window without using the button I have to change the state of the button 

     Frm_Main f = new Frm_Main(); 
     f = Application.OpenForms.OfType<Frm_Main>().Last(); 
     f.tlsBut_Protection.Checked = false; 

    }

與此代碼在主要形式，但我發現它導致我的程序的一些問題，其中一個問題是，在關閉表單後，如果我再次點擊按鈕，似乎與點擊事件關聯的方法不會被調用，表單沒有打開我不得不再次點擊它兩次，然後再次運行。

你知道我爲什麼做錯了嗎？

感謝您的幫助

來源

2015-05-11 Alessio Il Pierce Giannelli

爲了防止關閉表單，您可以訂閱FormClosing事件，觸發窗體關閉之前，和攔截（並取消）用戶的動作。

private void frm_Protection_FormClosing(object sender, FormClosingEventArgs e) 
{ 
    if (e.CloseReason == CloseReason.UserClosing) 
     e.Cancel = true; 
}

不幸的是，點擊「X」（在任務欄預覽或程序本身），並調用this.Close()都被視爲「UserClosing」關閉的原因，所以我們需要稍微修改它。

屬性添加到frm_Protection，並用它來確定表單是否可以關閉：

public bool CanClose { private get; set; } 

private void frm_Protection_FormClosing(object sender, FormClosingEventArgs e) 
{ 
    e.Cancel = !CanClose; 
}

然後當你希望允許的形式被關閉屬性設置爲僅true：

var frmP = Application.OpenForms.OfType<frm_Protection>().FirstOrDefault(); 

if (frmP != null) 
{ 
    frmP.CanClose = true; 
    frmP.Close(); 
}

來源

2015-05-11 14:01:31

嗨謝謝你的答案，但它不起作用，因爲這樣我就無法關閉它，即使當我想要 –

我明白你在說什麼。更新了答案。 –

c＃在關閉表單後更改按鈕的狀態？

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