.NET 4.8自定义控件WeatherBox在Designer中未生成实例化代码问题

环境信息 #

• .NET 4.8
• Visual Studio 2022
• WinForms设计器界面

问题描述 #

基于自定义控件MultiSelectComboBox继承实现了WeatherBox控件，编译后可从工具箱拖入设计器，但构建项目时报错：设计器生成的InitializeComponent()方法中未包含WeatherBox的实例化语句（父类MultiSelectComboBox能正常生成）。手动添加实例化代码可解决问题，但每次新增控件都需手动操作，十分繁琐。

相关代码 #

WeatherBox类 #

using [redacted].Util;
using [redacted].GUI.CustomizedControls;
using [redacted].GUI.CustomizedControls.MultiSelectComboBoxControl;
using System;
using System.Windows.Forms;

namespace [redacted].GUI.CustomizedControls.MultiSelectComboBoxControl.CustomMultiSelectComboBoxes
{
    public class WeatherBox : MultiSelectComboBox
    {
        WeatherBox() : base()
        {
            ListItemSelected += new System.EventHandler(WeatherYearBox_ListItemSelected);
        }

        private static void WeatherYearBox_ListItemSelected(object sender, EventArgs e)
        {
            try
            {
                CheckedListView CLV = (CheckedListView)sender;
                MultiSelectComboBox CMB = (MultiSelectComboBox)CLV.Tag;

                if (CMB.List.FocusedItem != null && CMB.List.FocusedItem.Text != "")
                {
                    CMB.close();
                    CMB.Tag = CMB.List.FocusedItem.Tag;
                    CMB.Items.Insert(0, CMB.List.FocusedItem.Text);
                    CMB.SelectedIndex = 0;
                }
                else
                    CMB.Tag = null;
            }
            catch (Exception ex)
            {
                Logger.logInfo(ex);
            }
        }
    }
}

MultiSelectComboBox构造函数片段 #

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Threading;
using [redacted].Util; 
using System.Text.RegularExpressions;
using System.Drawing;

namespace SERVM.MCFRED.GUI.CustomizedControls.MultiSelectComboBoxControl
{
    public class MultiSelectComboBox : ComboBox
    {
        public MultiSelectComboBox() : base()
        {
                contents.Owner = this;
                contents.searchbox.Tag = this;
                contents.searchBoxPic.Tag = true;
                popup = new Popup(contents);
                popup.Resizable = true;
                popup.Height = 500;
                popup.Tag = this;
                popup.LostFocus += new EventHandler(popup_LostFocus);
                popup.VisibleChanged += new EventHandler(popup_VisibleChanged);
                contents.resizeBox.MouseDown += new MouseEventHandler(pictureBox1_MouseDown);
                contents.resizeBox.MouseUp += new MouseEventHandler(pictureBox1_MouseUp);
                contents.resizeBox.MouseMove += new MouseEventHandler(pictureBox1_MouseMove);

                if (!isMultiSelectEnable)
                {
                }

                contents.checkedListView.Tag = popup;

                List = contents.checkedListView;
                List.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
                List.Click += new EventHandler(delegate { });

                SuspendLayout();
                Name = "MultiSelectComboBox";
                Size = new System.Drawing.Size(237, 23);
                DropDownHeight = 1;
                DropDownStyle = ComboBoxStyle.DropDownList;
                Click += new EventHandler(SortableDropDown_Click);
                MouseHover += new EventHandler(MultiSelectComboBox_MouseHover);
                MouseWheel += new MouseEventHandler(MultiSelectComboBox_MouseWheel);
                Layout += new LayoutEventHandler(MultiSelectComboBox_Layout);
                ResumeLayout(false);
            }
    }
}

设计器生成代码情况 #

• 控件声明（InitializeComponent()外部）：

private CustomizedControls.MultiSelectComboBoxControl.CustomMultiSelectComboBoxes.WeatherBox weatherBox1;
private CustomizedControls.MultiSelectComboBoxControl.MultiSelectComboBox multiSelectComboBox1;

• InitializeComponent()内部仅生成父类控件的实例化：

this.multiSelectComboBox1 = new [redacted].GUI.CustomizedControls.MultiSelectComboBoxControl.MultiSelectComboBox();

• 缺失WeatherBox的实例化语句：

this._weatherYearBox = new [redacted].GUI.CustomizedControls.MultiSelectComboBoxControl.CustomMultiSelectComboBoxes.WeatherBox();

已尝试的解决方案 #

• 清理、重建解决方案并重启Visual Studio
• 调整WeatherBox构造函数的: base()语句

以上操作均未解决问题，设计器仍无法自动生成WeatherBox的实例化代码。

内容的提问来源于stack exchange，提问作者when-cowz-fly