c# - 如何调试 base.Dispose(disposing) 样板上发生的 NullReferenceException

Question

我是 c# 和 VSTO 的新手。

我有一个 Excel 插件，我在其中创建了一个功能区和一些可以执行各种操作的新按钮。

我在 base.Dispose 中收到 NullReferenceException，该异常发生在加载项加载到 Excel 中时。

根据文档所说，我可能在没有使用 new 关键字的情况下实例化了一些东西，但我不知道在哪里可以找到我没有做过的东西!

我今天早些时候确实有这个工作，但没有进行任何备份或连接到源代码管理，事后看来这是个坏主意!

异常时有很多null，不知道有没有意义？

基本上；我不知道我做了什么突然导致这种情况发生，也不确定如何调试它、在哪里设置我的中断或这段样板如何适应事物的方案。

我不希望有人在我没有包含绝大多数代码的情况下神奇地解决错误，但对如何操作的一些指导或解释会很棒!

发生异常时的本地窗口

  -           this  {ReportFramework.Ribbon}      ReportFramework.Ribbon
        -           base  {ReportFramework.Ribbon}      Microsoft.Office.Tools.Ribbon.RibbonBase {ReportFramework.Ribbon}
        +           base  {ReportFramework.Ribbon}      System.ComponentModel.Component {ReportFramework.Ribbon}
                    Base  null  Microsoft.Office.Tools.Ribbon.OfficeRibbon
        +           Context     '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Context' threw an exception of type 'System.NullReferenceException' object {System.NullReferenceException}
                    Factory     null  Microsoft.Office.Tools.Ribbon.RibbonFactory
        +           Global      '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Global' threw an exception of type 'System.NullReferenceException'  bool {System.NullReferenceException}
        +           Name  '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Name' threw an exception of type 'System.NullReferenceException'    string {System.NullReferenceException}
        +           OfficeMenu  '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).OfficeMenu' threw an exception of type 'System.NullReferenceException'    Microsoft.Office.Tools.Ribbon.RibbonOfficeMenu {System.NullReferenceException}
        +           Parent      '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Parent' threw an exception of type 'System.NullReferenceException'  Microsoft.Office.Tools.Ribbon.RibbonComponent {System.NullReferenceException}
        +           RibbonId    '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).RibbonId' threw an exception of type 'System.NullReferenceException'      string {System.NullReferenceException}
        +           RibbonType  '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).RibbonType' threw an exception of type 'System.NullReferenceException'    string {System.NullReferenceException}
        +           RibbonUI    '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).RibbonUI' threw an exception of type 'System.NullReferenceException'      Microsoft.Office.Core.IRibbonUI {System.NullReferenceException}
        +           StartFromScratch  '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).StartFromScratch' threw an exception of type 'System.NullReferenceException'    bool {System.NullReferenceException}
        +           Tabs  '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Tabs' threw an exception of type 'System.NullReferenceException'    System.Collections.Generic.IList<Microsoft.Office.Tools.Ribbon.RibbonTab> {System.NullReferenceException}
        +           Tag   '((Microsoft.Office.Tools.Ribbon.RibbonBase)(this)).Tag' threw an exception of type 'System.NullReferenceException'     object {System.NullReferenceException}
        +           Non-Public members            
                    btnAddCETotals    null  Microsoft.Office.Tools.Ribbon.RibbonButton
                    btnLinkBank null  Microsoft.Office.Tools.Ribbon.RibbonButton
                    btnCEDataTransfer null  Microsoft.Office.Tools.Ribbon.RibbonButton
                    *...More btn's*
                    IsClose     false bool
                    LargeColWidth     0.0   double
        +           objCReport  {ReportFramework.Classes.CReport}   ReportFramework.Classes.CReport
                    objFormat   null  ReportFramework.Classes.CFormat
                    oExcel      null  Microsoft.Office.Interop.Excel.Application
                    PageWidthLandscape      0.0   double
                    PageWidthPortrait 0.0   double
                    SmallColWidth     0.0   double
                    tabBoyceTools     null  Microsoft.Office.Tools.Ribbon.RibbonTab
                    userName    null  string
                    WorksheetResult   null  Microsoft.Office.Interop.Excel.Worksheet
                    disposing   false bool

异常详情

  System.NullReferenceException was unhandled
    HResult=-2147467261
    Message=Object reference not set to an instance of an object.
    Source=Microsoft.Office.Tools.Common.v4.0.Utilities
    StackTrace:
         at Microsoft.Office.Tools.Ribbon.RibbonBase.Dispose(Boolean disposing)
         at ReportFramework.Ribbon.Dispose(Boolean disposing) in C:\Users\lsmith\Documents\Visual Studio 2010\Projects\xxx Tools 2\ReportFramework\Ribbon.Designer.cs:line 30
         at System.ComponentModel.Component.Finalize()
    InnerException: 

第 30 行是 base.Dispose 下面的行

Ribbon.Designer.cs

namespace ReportFramework
  {
      partial class Ribbon : Microsoft.Office.Tools.Ribbon.RibbonBase
      {
          /// <summary>
          /// Required designer variable.
          /// </summary>
          private System.ComponentModel.IContainer components = null;

          public Ribbon()
              : base(Globals.Factory.GetRibbonFactory())
          {
              InitializeComponent();
          }

          /// <summary> 
          /// Clean up any resources being used.
          /// </summary>
          /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
          protected override void Dispose(bool disposing)
          {
              if (disposing && (components != null))
              {
                  components.Dispose();
              }

              base.Dispose(disposing);

          }

          #region Component Designer generated code

          /// <summary>
          /// Required method for Designer support - do not modify
          /// the contents of this method with the code editor.
          /// </summary>
          private void InitializeComponent()
          {
              this.tabBoyceTools = this.Factory.CreateRibbonTab();
              this.grpBoyceCAL = this.Factory.CreateRibbonGroup();
              this.btnGenerateCAL = this.Factory.CreateRibbonButton();
             *...Lots more code here; not sure if it's pertinent. can post if necessary.*

      }

      partial class ThisRibbonCollection
      {
          internal Ribbon Ribbon
          {
              get { return this.GetRibbon<Ribbon>(); }
          }
      }
  }

Answer 1

FWIW，在选中“项目设置”>“签署程序集”中的复选框并尝试使用临时 key 签署后，我开始收到此异常。

我确定此错误可能是由许多其他错误引起的，但希望这对某人有所帮助。