什麼調用ListViewItem_ItemChecked事件？

Question

我有一個ListView，複選框= TRUE，查看=列表。在項目開始時，我會經歷一些計算並確定數據庫是否爲空，以及我應該從那裏做些什麼。好了一兩件事，我要做的就是通過報表名稱的數組（從DLL）迭代，並添加列表視圖項到ListView，因爲我們希望它儘可能的動態。在ListViewItem_ItemChecked事件如果應用程序剛剛啓動（If Not _bShowAll Then）我就讓它通過，否則我所說的「看病貴」的功能。當我去開始我的應用程序，它似乎是服用一段時間了，所以我把一個破發點，在「看病貴」功能，因爲有報告名稱被擊中多次。我知道ListViewItem.SelectedItem如果設置將調用ListViewItem_ItemChecked，以及ListViewItem.Checked，我想其他幾個。但從初始化，我要求一個ListViewItem的唯一函數是插入。當我在ListViedItem_ItemChecked中放置一個斷點時，我打斷點。下面是我的構造函數，ListViewItem_ItemChecked和「昂貴」函數。

Public Sub New() 
    'Initializes all of the controls on the screen and their properties.' 
    InitializeComponent() 
    'Sets the variable to what the Window text is at Startup' 
    _strTitle = Me.Text 

    'ViewModes is a dll that contains Class ViewModes and a variable ViewModes.' 
    'Goes through the Dictionary(Of string, String) and adds all of the keys to the View Mode ComboBox.' 
    For Each kvp As KeyValuePair(Of String, String) In ViewModes.ViewModes.ViewModes 
     cmbViewMode.Items.Add(kvp.Key) 
    Next 

    'Sets the View Mode ComboBox to the first item that was added to it.' 
    cmbViewMode.SelectedIndex = 0 

    lblFigureTitle.Text = "ALL" 

    _bShowAll = True 

    For Each strReportName As String In _dataController.ReportNames 
     lvReports.Items.Insert(lvReports.Items.Count, strReportName) 
    Next 

    _bShowAll = False 

    'Check to see if the database has any information or not.' 
    If Not _dataController.DatabaseIsEmpty Then 
     'There''s no point in doing the stuff in this block if the database is Empty' 

     'Sets the lable next to "IPB:" to the IPB obtained from the first record of the .out file.' 
     lblIPBNumber.Text = _dataController.IPBNumber 
     'Adds the IPB Number to the Window text so if it is minimized and the user has multiple' 
     'instances of the app running, they can know which one is which by hovering over the bar in the Taskbar.' 
     Me.Text = _strTitle + " IPB: " + _dataController.IPBNumber 
     'This builds the TreeView with the Figure names.' 
     BuildFigureTree() 
     'This goes through the data in the database and builds the list of reports' 
     'BuildReports()' 
    End If 
End Sub 

Private Sub lvReports_ItemChecked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ItemCheckedEventArgs) Handles lvReports.ItemChecked 
    If Not e Is Nothing Then 
     If cbAllReports.Checked Then 
      If Not e.Item.Checked Then 
       cbAllReports.Checked = False 
       e.Item.Checked = True 
      End If 

      _lstReportFilter.Add(e.Item.Name) 
     Else 
      If e.Item.Checked Then 
       _lstReportFilter.Add(e.Item.Name) 
       cbTaggedRecords.Checked = False 
      Else 
       _lstReportFilter.Remove(e.Item.Name) 
      End If 
     End If 
    Else 
     For Each lvi As ListViewItem In lvReports.Items 
      lvi.Checked = False 
     Next 
    End If 

    For Each rr As ReportRecord In _lstReportRecords.Where(Function(rRecord As ReportRecord) _lstReportFilter.Contains(rRecord.Description)) 
     _strReportFilter += If(String.IsNullOrEmpty(_strReportFilter) Or _strReportFilter = "-1", "", ",") + rr.PartID.ToString() 
    Next 

    If Not _bShowAll Then 
     FillDataGridView() 
    End If 
End Sub 

Private Sub FillDataGridView() 
    'Set the cursor to a wait cursor just in case it takes some time retrieving information from the db' 
    Me.Cursor = Cursors.WaitCursor 
    Try 
     'We always want to make sure both scroll bars are visible' 
     dgvParts.ScrollBars = ScrollBars.Both 

     Dim strFilter As String = String.Empty 

     'If there is a value in the Search TextBox, add it to the filter' 
     If Not String.IsNullOrEmpty(_strSearchFilter) Then 
      strFilter += If(String.IsNullOrEmpty(strFilter), " ", " and ") + _strSearchFilter 
     End If 

     'For us to filter on Figures, there has to be nodes in the tree.' 
     If tvFigures.Nodes.Count > 0 Then 
      'If the FigureTitle text equals "ALL" (set whenever a tree node is selected)' 
      'then we don''t need to set a filter for figure.' 
      If Not lblFigureTitle.Text = "ALL" Then 
       'cbCurrentFigure is naturally not checked. And we don''t want to filter on just that figure' 
       'if the user isn''t searching for something. So if there is a value in the search box and' 
       'cbCurrentFigure is checked, then we want to look at only the selected figure. However,' 
       'if the search box is empty and cbCurrentFigure is not checked, we also want to search' 
       'only on the selected figure.' 
       If (Not String.IsNullOrEmpty(_strSearchFilter) And cbCurrentFigure.Checked) Or (String.IsNullOrEmpty(_strSearchFilter) And Not cbCurrentFigure.Checked) Then 
        strFilter += If(String.IsNullOrEmpty(strFilter), " ", " and ") + Constants.TransformColumnOrHeaderName("Figure") + " = '" + tvFigures.SelectedNode.Name + "'" 
       End If 
      Else 
       strFilter += If(String.IsNullOrEmpty(strFilter), " ", " and ") + Constants.TransformColumnOrHeaderName("Figure") + " LIKE '%%' " 
      End If 
     End If 

     'A selection of an indenture level in the combo box means we need to add a filter. "ALL"' 
     'is not a selection and needs no filter.' 
     If Not cmbIndentureLevel.Text = "ALL" And Not String.IsNullOrEmpty(cmbIndentureLevel.Text) Then 
      strFilter += If(String.IsNullOrEmpty(strFilter), " ", " and ") + Constants.TransformColumnOrHeaderName("Indenture") + " = " + cmbIndentureLevel.Text 
     End If 

     'If the user has selected any of the reports in the list view, add those to the filter.' 
     If Not String.IsNullOrEmpty(_strReportFilter) Then 
      strFilter += If(String.IsNullOrEmpty(strFilter), " ", " and ") + " PART_ID IN (" + _strReportFilter + ")" 
     End If 

     'If there is no filter, then we don''t want to view anything.' 
     If Not String.IsNullOrEmpty(strFilter) Then 
      'If there are validation errors from importing the file, we want to display those errors and get out.' 
      If _lstValidationResults.Count > 0 Then 
       dgvParts.DataSource = _lstValidationResults 

       For Each col As DataGridViewColumn In dgvParts.Columns 
        col.DataPropertyName = "ErrorMessage" 
        col.Visible = True 
        col.SortMode = DataGridViewColumnSortMode.Programmatic 
        col.AutoSizeMode = DataGridViewAutoSizeColumnMode.ColumnHeader 
       Next 

       dgvParts.AutoResizeColumns() 
       Return 
      End If 

      Dim bSource As BindingSource = New BindingSource() 
      'We use the text from the View Mode combo box to look in a dictionary and obtain' 
      'the query needed for that view. We also send the filter so we get ONLY what we' 
      'need when we''re pulling the data, instead of pulling it all and then filtering.' 
      bSource.DataSource = _dataController.PopulateDataGrid(cmbViewMode.Text, strFilter).Tables(0) 

      dgvParts.DataSource = bSource 
      dgvParts.Columns(0).Visible = False 
      'The Description Column should only be 250 characters in size. If a description is longer' 
      'than that, they need to double click the cell and a message box will pop up.' 
      dgvParts.Columns("Description").Resizable = DataGridViewTriState.False 
      dgvParts.Columns("Description").Width = 750 

      For Each col As DataGridViewColumn In dgvParts.Columns 
       'Programmatic sorting means custom sorting. May be changed to automatic.' 
       col.SortMode = DataGridViewColumnSortMode.Programmatic 

       'Again, we don''t want to resize the description column, it should stay set.' 
       If Not col.Name = "Description" Then 
        dgvParts.AutoResizeColumn(col.Index) 
       End If 

       'Because the Tags column is only reported, we do not want them to change any values' 
       'in the column.' 
       If col.Name.ToUpper() = "TAGS" Then 
        col.ReadOnly = True 
       End If 
      Next 

      'Other row and cell properties.' 
      dgvParts.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.DisplayedCells 
      dgvParts.ShowCellToolTips = True 
      dgvParts.BorderStyle = BorderStyle.Fixed3D 
     End If 

     FormatCells() 

     'The information from here until the Catch statement goes through and counts how' 
     'many records for each report there are and to set those counts into the items' 
     'in the list view.' 
     Dim nTotalCount As Integer = 0 

     For Each lvi As ListViewItem In lvReports.Items 
      Dim nCount As Integer = _lstReportRecords.Where(Function(rr As ReportRecord) lvi.Text.Contains(rr.Description)).Count() 
      nTotalCount += nCount 
      lvi.Text = If(lvi.Text.Contains("("), lvi.Text.Substring(0, lvi.Text.IndexOf("(") + 1), lvi.Text.Trim() + " (") + nTotalCount.ToString() + ")" 
     Next 

     cbAllReports.Text = If(cbAllReports.Text.Contains("("), cbAllReports.Text.Substring(0, cbAllReports.Text.IndexOf("(") + 1), cbAllReports.Text + " (") + nTotalCount.ToString() + ")" 
     cbTaggedRecords.Text = If(cbTaggedRecords.Text.Contains("("), cbTaggedRecords.Text.Substring(0, cbTaggedRecords.Text.IndexOf("(") + 1), cbTaggedRecords.Text + " (") + _lstReportRecords.Where(Function(rr As ReportRecord) rr.Description.Contains("Tagged")).Count().ToString() + ")" 
    Catch ex As Exception 
     'An exception was thrown. Show it to the user so they can report it.' 
     MessageBox.Show(ex.Message) 
    End Try 
    'Change the cursor back to the default cursor' 
    Me.Cursor = Cursors.Default 
End Sub 

我確信_bShowAll是真正插入項目到ListView和假事後之前（指穿過ItemChecked功能），但我還是打了ItemChanged功能。任何人都可以看到我缺少的東西，讓它更容易的方法，或者有沒有方法插入一個項目，而無需調用ItemChecked方法？謝謝。

更新：沒想到所有人。我發現this其中說，當CheckBoxes屬性設置爲true時，它調用該方法。

Answer 1

我發現它是什麼，它不是我的代碼中的任何東西。無論出於何種原因，在設計器中將CheckBoxes屬性設置爲True將在調用主構造函數後調用ItemChecked事件。我不知道爲什麼微軟會這麼做，但不管。 :)

Answer 2

最簡單的事情就是在您設置的斷點處查看調用堆棧。向上滾動足夠遠，你應該看到你自己的代碼。單擊堆棧跟蹤的那一部分，IDE會將您帶到導致問題的代碼行。