小贝子编程

c#系统.InvalidOperationException: Collection被修改;不能执行枚举操作



我研究了这个问题，还没有找到适合我的。我并不是在尝试编辑我正在循环的内容。

************** Exception Text **************
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()

这是我的函数导致的:

internal static bool CloseAllForms()
{
    try
    {
        if (clsGlobal.g_objfrmCustomerInformation != null)
            clsGlobal.g_objfrmCustomerInformation.Close();
        if (clsGlobal.g_objfrmSearchCustomer != null)
            clsGlobal.g_objfrmSearchCustomer.Close();
        if (clsGlobal.g_objfrmSwipeLicense != null)
            clsGlobal.g_objfrmSwipeLicense.Close();
        if (clsGlobal.g_objfrmSearchResults != null)
            clsGlobal.g_objfrmSearchResults.Close();
        if (clsGlobal.g_objfrmCustomerData != null)
            clsGlobal.g_objfrmCustomerData.Close();
        if (clsGlobal.g_objfrmPurchaseOrder != null)
            clsGlobal.g_objfrmPurchaseOrder.Close();
        if (clsGlobal.g_objfrmAddPurchaseOrderItem != null)
            clsGlobal.g_objfrmAddPurchaseOrderItem.Close();
        if ((clsGlobal.g_objfrmCustomerInformation == null) && (clsGlobal.g_objfrmSearchCustomer == null) && (clsGlobal.g_objfrmSwipeLicense == null) && (clsGlobal.g_objfrmSearchResults == null) && (clsGlobal.g_objfrmCustomerData == null) && (clsGlobal.g_objfrmPurchaseOrder == null) && (clsGlobal.g_objfrmAddPurchaseOrderItem == null))
        {
            PrepareImageBar();
            return true;
        }
        else
        {
            PrepareImageBar();
            return false;
        }
    }
    catch (Exception ex)
    {
        string ErrorMessage;
        ErrorMessage = "Error: " + ex.Message +
           "rnSource: " + ex.Source +
           "rnTargetSite: " + ex.TargetSite.ToString() +
           "rnStackTrace: " + ex.StackTrace.ToString();
        if (ex.Data.Count > 0)
        {
            ErrorMessage += "rnData Count: " + ex.Data.Count.ToString() +
                "rnKeys: " + ex.Data.Keys.ToString() +
                "rnValues: " + ex.Data.Values.ToString();
        }
        MessageBox.Show(ErrorMessage, "", MessageBoxButtons.OK, MessageBoxIcon.Error);
        CustomFunctions.emailExceptionToAuthor(ex);
        return false;
    }
}

我是这样调用函数的:

if (CloseAllForms())
{
    if (clsGlobal.g_objfrmPurchaseOrder == null)
    {
        clsGlobal.g_objfrmPurchaseOrder = new frmPurchaseOrder();
        clsGlobal.g_objfrmPurchaseOrder.FormClosed += PurchaseOrderFormClosed;
        clsGlobal.g_objfrmPurchaseOrder.MdiParent = clsGlobal.g_objfrmMDIMain;
        clsGlobal.g_objfrmPurchaseOrder.Show();
        clsGlobal.g_objfrmPurchaseOrder.BringToFront();
    }
    else
    {
        clsGlobal.g_objfrmPurchaseOrder.Show();
        clsGlobal.g_objfrmPurchaseOrder.BringToFront();
    }
    PrepareImageBar();
}

请帮帮我!

更新:这里是完整的代码。

例外有关调用的详细信息，请参阅此消息的末尾即时(JIT)调试，而不是这个对话框。

************** Exception Text **************
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at System.Collections.Generic.List`1.Enumerator.MoveNext()
at Microsoft.VisualBasic.PowerPacks.ShapeCollection.Dispose(Boolean disposing)
at Microsoft.VisualBasic.PowerPacks.ShapeContainer.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at System.Windows.Forms.Control.Dispose(Boolean disposing)
at System.Windows.Forms.Form.Dispose(Boolean disposing)
at B2HD_Software.frmCustomerData.Dispose(Boolean disposing)
at System.Windows.Forms.Form.WmClose(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

PrepareImageBar (); 

internal static void PrepareImageBar()
{
clsGlobal.g_objfrmMDIMain.mnuImageBarAddCustomer.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarAddCustomer.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarEditCustomer.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarEditCustomer.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarFindCustomer.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarFindCustomer.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarStartSearch.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarStartSearch.Enabled = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarSwipeLicense.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarSwipeLicense.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarViewNotes.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarViewNotes.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarNewPurchase.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarNewPurchase.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarAddItem.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarAddItem.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarModifyItem.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarModifyItem.Enabled = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarDeleteItem.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarDeleteItem.Enabled = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarTakePicture.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarTakePicture.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarSavePicture.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarSavePicture.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarSave.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarSave.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Enabled = true;
clsGlobal.g_objfrmMDIMain.mnuImageBarAdmin.Visible = false;
clsGlobal.g_objfrmMDIMain.mnuImageBarAdmin.Enabled = true;
switch (clsGlobal.ActiveForm())
{
    case "CustomerInformation":
        clsGlobal.g_objfrmMDIMain.mnuImageBarTakePicture.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarSave.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Enabled = true;
        break;
    case "SearchCustomer":
        clsGlobal.g_objfrmMDIMain.mnuImageBarStartSearch.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarSwipeLicense.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarStartSearch.Enabled = false;
        break;
    case "SwipeLicense":
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        break;
    case "CustomerData":
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarViewNotes.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarNewPurchase.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarEditCustomer.Visible = true;
        break;
    case "PurchaseOrder":
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarAddItem.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarDeleteItem.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarModifyItem.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarEditCustomer.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarViewNotes.Visible = true;
        clsGlobal.g_objfrmPurchaseOrder.ShowProperButtons();
        break;
    case "AddPurchaseOrderItem":
        clsGlobal.g_objfrmMDIMain.mnuImageBarTakePicture.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarSave.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarCancel.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarViewNotes.Visible = true;
        break;
    default:
        clsGlobal.g_objfrmMDIMain.mnuImageBarAddCustomer.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarFindCustomer.Visible = true;
        clsGlobal.g_objfrmMDIMain.mnuImageBarSwipeLicense.Visible = true;
        break;
}
}

CloseAllForms ()

internal static bool CloseAllForms()
{
if (clsGlobal.g_objfrmCustomerInformation != null)
    clsGlobal.g_objfrmCustomerInformation.Close();
if (clsGlobal.g_objfrmSearchCustomer != null)
    clsGlobal.g_objfrmSearchCustomer.Close();
if (clsGlobal.g_objfrmSwipeLicense != null)
    clsGlobal.g_objfrmSwipeLicense.Close();
if (clsGlobal.g_objfrmSearchResults != null)
    clsGlobal.g_objfrmSearchResults.Close();
if (clsGlobal.g_objfrmCustomerData != null)
    clsGlobal.g_objfrmCustomerData.Close();
if (clsGlobal.g_objfrmPurchaseOrder != null)
    clsGlobal.g_objfrmPurchaseOrder.Close();
if (clsGlobal.g_objfrmAddPurchaseOrderItem != null)
    clsGlobal.g_objfrmAddPurchaseOrderItem.Close();
if ((clsGlobal.g_objfrmCustomerInformation == null) && (clsGlobal.g_objfrmSearchCustomer == null) && (clsGlobal.g_objfrmSwipeLicense == null) && (clsGlobal.g_objfrmSearchResults == null) && (clsGlobal.g_objfrmCustomerData == null) && (clsGlobal.g_objfrmPurchaseOrder == null) && (clsGlobal.g_objfrmAddPurchaseOrderItem == null))
{
    PrepareImageBar();
    return true;
}
else
{
    PrepareImageBar();
    return false;
}
}

这是我的关闭事件在每个表单上的样子。

internal static void CustomerInformationFormClosed(object sender, FormClosedEventArgs e)
    {
        clsGlobal.g_objfrmCustomerInformation = null;
        PrepareImageBar();
    }

我认为有三种可能性:

  1. 某些东西在FormClosed事件处理程序中失败的形式之一(即，可能是PurchaseOrderFormClosed中的某些东西)。
  2. 您的CloseAllForms()方法正在catch中做一堆工作。有可能代码在那里失败了。当错误发生时，您看到MessageBox了吗?邮件发送了吗?试着注释掉所有的代码，看看是否仍然会出现错误。或者暂时用MessageBox.Show(ex.ToString())替换catch中的所有代码，这样你就可以确保你看到的异常发生在try中。
  3. PrepareImageBar()出现故障。试着注释掉这个方法，看看你是否仍然得到错误。

我不知道异常发生在哪里，但异常可能在foreach代码块中生成，其中修改了集合。这里，修改的意思是"添加"或"删除"，比如:

foreach(var item in collection)    { collection.Add(other);}

枚举时不能修改集合。

要找到它发生的地方，如果是在你的代码，而调试，你会检查'用户未处理的选项'在例外对话框(Ctrl+Alt+E)。但是，请注意，要使用此选项，VS必须在调试选项中设置为"只启用我的代码"。

我见过这个bug:这个错误显然只出现在一些windows安装上，我从来没有通过调试让它发生在开发环境中，只有完整的应用程序。

这是VisualBasic.PowerPacks中的一个错误。

请参阅此处查看解决方案(请参阅博客末尾)。

您基本上必须重写窗体的Dispose()方法并手动处置所有VisualBasic Powerpack项。

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