托管 UserControl 设计器的 ToolStripControlHost 不会发生序列化

Question

我目前正在开发一个应用程序，我想在其中显示一个上下文菜单中的用户控件。我能够（使用 ToolStripControlHost 在某种程度上实现了这一点）。显示在（NumericUpDownToolStripItem 代码）：下面是对象的代码（用 VC++.net 2.0 编写）。注意：对此有半相似的 SO 问题，但似乎没有一个处理序列化用户控件，只是用户控件中的标准对象。

显示在对象后面的是实际用户控件的代码，它是一个带有标签的用户控件和一个 numericupdown 控件。

问题：当我为我的应用程序加载设计器时，我可以添加我的 NumericUpDownToolStripItem 就好了，但是，当我打开使用暴露的属性来编辑我的用户控件时，这些数据都没有序列化到 InitializeComponent 方法我的 NumericUpDownToolStripItem 对象。这样做的效果是我的控件在运行时加载了所有默认值。每次我重新加载表单时，修改都会丢失。

我曾尝试使用位于On Msdn 的 TypeConverter 教程，但它无法正常工作。一切都编译得很好，除了我的对象在设计网格中完全变灰（只是访问器属性，而不是整个菜单）。我注意到的另一个问题是，此方法不是专门为 UserControls 设计的，它可能有几个不同的可修改属性，并且不可能每个都有重载。

所以，我有以下问题：

1. 我正在做的事情是实用的，还是我的结构偏离了规范。我敢肯定属性中有很多冗余。
2. 序列化另一个 UserControl\toolstriphost 'parent' 中包含的 usercontrol 'child' 的正确方法是什么。 'child' 中的任何属性都是简单值（字符串、小数等）。
3. 当没有实现 TypeConverter 类时，每次我更改一个属性（例如标签文本）时，对象的绘制都会被抬高并且表现得很奇怪，直到我重新引导上下文\菜单或表单。有没有适当的方法通知设计师因为我做了改变而重新粉刷？ （我使用了 invalidate，它充其量是狡猾的）。

提前致谢。我将继续研究这个问题并保持更新。

NumericUpDownToolStripItem Class:
    [ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability::All)]
    public ref class NumericUpDownToolStripItem : public ToolStripControlHost
    {
       public: 
       [DesignerSerializationVisibility(DesignerSerializationVisibility::Content | 
          DesignerSerializationVisibility::Visible)]
       property LabeledNumericUpDown ^LabeledNumericUpDownControl
       {
         LabeledNumericUpDown ^get() { return (LabeledNumericUpDown^)this->Control; }
       }

       public: NumericUpDownToolStripItem(void) : 
          ToolStripControlHost(gcnew LabeledNumericUpDown()) {}

       protected: void OnSubscribeControlEvents(Control ^control) new  { //irrelevant to question }
       protected: void OnUnsubscribeControlEvents(Control ^control) new { //irrelevant to question }       
    };

public ref class LabeledNumericUpDown : public UserControl
{
   public: [ DesignerSerializationVisibility(DesignerSerializationVisibility::Content | 
    DesignerSerializationVisibility::Visible)]
   property String ^DisplayText {
      String ^get() {
         return this->label->Text;
      }
      void set(String ^val) {
         if(this->label->Text != val)
         {
            this->label->Text = val;
            this->Invalidate();
         }
      }
   }

//constructor
//destructor
//initiailecomponent
};

Answer 1

好吧，经过大量搜索，我找到了答案。我的方法很好，除了一个主要问题：我根本不需要类型转换器。我的问题是需要自定义 CodeDomConverter。下面显示的是我的解决方案。

    generic<typename T>
    ref class CustomCodeDomSerializer : CodeDomSerializer
    {
    public: virtual Object ^Deserialize(IDesignerSerializationManager ^manager, Object ^codeObject) override
       {
          // This is how we associate the component with the serializer.
          CodeDomSerializer ^baseClassSerializer = (CodeDomSerializer^)manager->
             GetSerializer(T::typeid->BaseType, CodeDomSerializer::typeid);

           //This is the simplest case, in which the class just calls the base class
           //   to do the work. 
          return baseClassSerializer->Deserialize(manager, codeObject);
       }

       public: virtual Object ^Serialize(IDesignerSerializationManager ^manager, Object ^value) override
       {
           //Associate the component with the serializer in the same manner as with
           //   Deserialize 
          CodeDomSerializer ^baseClassSerializer = (CodeDomSerializer^)manager->
             GetSerializer(T::typeid->BaseType, CodeDomSerializer::typeid);

          Object ^codeObject = baseClassSerializer->Serialize(manager, value);

           //Anything could be in the codeObject.  This sample operates on a
           //   CodeStatementCollection. 
          if (dynamic_cast<CodeStatementCollection^>(codeObject))
          {
             CodeStatementCollection ^statements = (CodeStatementCollection^)codeObject;

             // The code statement collection is valid, so add a comment.
             String ^commentText = "This comment was added to this Object by a custom serializer.";
             CodeCommentStatement ^comment = gcnew CodeCommentStatement(commentText);
             statements->Insert(0, comment);
          }
          return codeObject;
       }

};




////////////////////////////////////////////////////////////////////////////////////////////////////
///   <summary>   
///   This Usercontrol is a simple label coupled with a numericupdown.  The class following
///   it will wrap this item in toolstrip container so that it can be part of a contextmenu
///   </summary>
////////////////////////////////////////////////////////////////////////////////////////////////////
[DesignerSerializer(CustomCodeDomSerializer<LabeledNumericUpDown^>::typeid, CodeDomSerializer::typeid)]
public ref class LabeledNumericUpDown : UserControl
{
   public: event EventHandler ^NumericUpDownValueChanged;

   public: [Category("Custom Information"), Description(L"Text to display"), 
            DefaultValue(L"Default Text"), Browsable(true), Localizable(true), NotifyParentProperty(true)]
   property String ^DisplayText
   {
      String ^get()
      {
         return this->label->Text;
      }
      void set(String ^val)
      {
         this->label->Text = val;
         if(this->DesignMode || 
            LicenseManager::UsageMode == LicenseUsageMode::Designtime) 
            this->Invalidate();

      }
   }
  //designer stuff not important
}




[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability::All),
 ToolboxBitmap(::NumericUpDown::typeid)]
public ref class NumericUpDownToolStripItem : ToolStripControlHost
{
   //replace this type
   private: LabeledNumericUpDown ^_Control;

   public: [Category("Object Host"), Description(L"Hosted usercontrol object"), 
    DisplayName("UserControl Object"), Browsable(true), NotifyParentProperty(true),
    DesignerSerializationVisibility(DesignerSerializationVisibility::Content)]
    //replace this properties type
   property LabeledNumericUpDown ^UserControlObject
   {
     //replace this properties return type
     LabeledNumericUpDown ^get() { return this->_Control; }
   } 

   public: NumericUpDownToolStripItem(void) : 
      System::Windows::Forms::ToolStripControlHost(gcnew FlowLayoutPanel())
    { 
      //replace this constructor type
      _Control = gcnew LabeledNumericUpDown();

      //don't touch this
      FlowLayoutPanel ^thePanel = (FlowLayoutPanel ^)this->Control;
      thePanel->BackColor = Color::Transparent;
      thePanel->Controls->Add(_Control);
   }   
};

Answer 2

我最近的“有效”解决方案：

////////////////////////////////////////////////////////////////////////////////////////////////////
///   <summary>   
///   This Usercontrol is a simple label coupled with a numericupdown.  The class following
///   it will wrap this item in toolstrip container so that it can be part of a contextmenu
///   </summary>
////////////////////////////////////////////////////////////////////////////////////////////////////
[DesignerSerializer(CustomCodeDomSerializer<LabeledNumericUpDown^>::typeid, CodeDomSerializer::typeid)]
public ref class LabeledNumericUpDown : UserControl
{
   public: event EventHandler ^NumericUpDownValueChanged;

   public: [Category("Custom Information"), Description(L"Text to display"), 
            DefaultValue(L"Default Text"), Browsable(true), Localizable(true), NotifyParentProperty(true)]
   property String ^DisplayText
   {
      String ^get();
      void set(String ^val);
   }

   public: [Category("Custom Information"), Description(L"NumericUpDown Value"), 
            DefaultValue(1), Browsable(true), Localizable(true), NotifyParentProperty(true)]
   property Decimal UpDownValue
   {
      Decimal get();
      void set(Decimal val);
   }

   public: [Category("Custom Information"), Description(L"NumericUpDown Maximum"), 
            DefaultValue(100), Browsable(true), Localizable(true), NotifyParentProperty(true)]
   property Decimal UpDownMaximum
   {
      Decimal get();
      void set(Decimal val);
   }

   public: [Category("Custom Information"), Description(L"NumericUpDown Minimum"), 
            DefaultValue(0), Browsable(true), Localizable(true), NotifyParentProperty(true)]
   property Decimal UpDownMinimum
   {
      Decimal get();
      void set(Decimal val);
   }

   private: bool SupressEvents;
   public: Void UpDownValueSet_NoEvent(int Val);
   private: Void numericUpDown_ValueChanged(Object ^sender, EventArgs ^e);
   public: LabeledNumericUpDown(void);
   private: System::Windows::Forms::NumericUpDown^  numericUpDown;
   private: System::Windows::Forms::Label^  label;
   private: System::Windows::Forms::TableLayoutPanel^  tableLayoutPanel1;
   private: System::ComponentModel::Container ^components;
   #pragma region Windows Form Designer generated code
   void InitializeComponent(void);
};

////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>   CustomCodeDomSerializer
/// This is a specialized usercontrol designed to incapsulate another usercontrol (in this case a  
/// NumericUpDownToolStripItem.  In order to use this class, you must copy this entire class and 
/// create a new object.  (You can do this right underneath your usercontrol in the same file 
/// if you wish.  You must specifiy the type of your object every place its mentioned.
///   
/// To Note:  The toolbox bitmap is what the icon will look like.  You can specify any old control.
/// It is possible to use a custom icon, but I can't figure out how.
///</summary>
/// 
/// <value> The tool strip control host. </value>
////////////////////////////////////////////////////////////////////////////////////////////////////

[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability::All),
 ToolboxBitmap(::NumericUpDown::typeid)]
public ref class NumericUpDownToolStripItem : ToolStripControlHost
{
   //replace this type
   private: LabeledNumericUpDown ^_Control;

   public: [Category("Object Host"), Description(L"Hosted usercontrol object"), 
    DisplayName("UserControl Object"), Browsable(true), NotifyParentProperty(true),
    DesignerSerializationVisibility(DesignerSerializationVisibility::Content)]
    //replace this properties type
   property LabeledNumericUpDown ^UserControlObject
   {
     //replace this properties return type
     LabeledNumericUpDown ^get() { return this->_Control; }
   } 

   public: NumericUpDownToolStripItem(void) : 
      System::Windows::Forms::ToolStripControlHost(gcnew FlowLayoutPanel())
   { 
      //replace this constructor type
      _Control = gcnew LabeledNumericUpDown();

      //don't touch this
      FlowLayoutPanel ^thePanel = (FlowLayoutPanel ^)this->Control;
      thePanel->BackColor = Color::Transparent;
      thePanel->Controls->Add(_Control);
   }   
};