Datagridview同一列单元格有textbox和combox（使用EditingControlShowing事件动态覆盖编辑控件）

使用EditingControlShowing事件动态覆盖编辑控件

完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Demo1
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            //dataGridView1.AutoGenerateColumns = false;
            //dataGridView1.DataSource = null;
            myDatas.Add(myData);
            myDatas.Add(myData1);
            dataGridView1.DataSource = myDatas;
        }
        List<MyData> myDatas = new List<MyData>();
        MyData myData = new MyData();
        MyData myData1 = new MyData();

        private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            // 判断是否是需要特殊处理的列和行

            int ColumnIndex= dataGridView1.CurrentCell.ColumnIndex; 
            int RowIndex= dataGridView1.CurrentCell.RowIndex;   
            
          Console.WriteLine($"ColumnIndex={ColumnIndex},RowIndex={RowIndex}");  
            if (ColumnIndex == 1 && RowIndex == 1)
            {
                
                // 关键1：移除之前可能添加的事件处理程序，防止重复订阅
                if (currentOverlayControl is ComboBox previousCombo)
                {
                    previousCombo.SelectedIndexChanged -= OverlayComboBox_SelectedIndexChanged;
                }
                if (currentOverlayControl is TextBox previousText)
                {
                    previousText.TextChanged -= OverlayTextBox_TextChanged;
                }

                // 移除当前可能存在的覆盖控件
                if (currentOverlayControl != null)
                {
                    dataGridView1.Controls.Remove(currentOverlayControl);
                    currentOverlayControl.Dispose();
                    currentOverlayControl = null;
                }

                // 获取默认的编辑控件（通常是一个TextBox）及其位置
                Control defaultControl = e.Control;
                Rectangle cellRect = dataGridView1.GetCellDisplayRectangle(dataGridView1.CurrentCell.ColumnIndex, dataGridView1.CurrentCell.RowIndex, false);

                // 关键2：根据“类型”列的值决定创建哪种覆盖控件
                string currentType = dataGridView1.CurrentCell.Value?.ToString();
                //bool isCategoryType = currentType == "分类";

                if (true)
                {
                    // 创建并配置覆盖用的ComboBox
                    ComboBox overlayCombo = new ComboBox();
                    overlayCombo.DropDownStyle = ComboBoxStyle.DropDownList; // 设置为下拉列表
                    overlayCombo.Items.Add("选项A"); // 设置数据源
                    overlayCombo.Items.Add("选项B"); // 设置数据源
                    overlayCombo.Items.Add("选项C"); // 设置数据源
                    overlayCombo.Size = new Size(cellRect.Width, overlayCombo.Height);

                    // 设置初始值为当前单元格的值
                    overlayCombo.SelectedItem = dataGridView1.CurrentCell.Value;

                    // 关键3：将ComboBox添加到DataGridView的控件集合中，并定位到当前单元格
                    overlayCombo.Location = new Point(cellRect.Left, cellRect.Top);
                    dataGridView1.Controls.Add(overlayCombo);

                    // 订阅ComboBox的值改变事件
                    overlayCombo.SelectedIndexChanged += OverlayComboBox_SelectedIndexChanged;

                    // 将焦点和选择项设置给覆盖控件
                    overlayCombo.BringToFront();
                    overlayCombo.Focus();
                    currentOverlayControl = overlayCombo;
                }
                else
                {
                    // 创建并配置覆盖用的TextBox
                    TextBox overlayText = new TextBox();
                    overlayText.Size = new Size(cellRect.Width, cellRect.Height);
                    overlayText.Text = dataGridView1.CurrentCell.Value?.ToString() ?? "";

                    overlayText.Location = new Point(cellRect.Left, cellRect.Top);
                    dataGridView1.Controls.Add(overlayText);

                    // 订阅TextBox的文本改变事件
                    overlayText.TextChanged += OverlayTextBox_TextChanged;

                    overlayText.BringToFront();
                    overlayText.Focus();
                    currentOverlayControl = overlayText;
                }

                // 隐藏默认的编辑控件
                defaultControl.Visible = false;

            }
        }
        // 当覆盖的ComboBox选项改变时，实时更新单元格的值
        private void OverlayComboBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (sender is ComboBox combo && dataGridView1.CurrentCell != null)
            {
                dataGridView1.CurrentCell.Value = combo.SelectedItem;
            }
        }

        // 当覆盖的TextBox文本改变时，实时更新单元格的值
        private void OverlayTextBox_TextChanged(object sender, EventArgs e)
        {
            if (sender is TextBox textBox && dataGridView1.CurrentCell != null)
            {
                dataGridView1.CurrentCell.Value = textBox.Text;
            }
        }
        // 声明一个变量来跟踪当前覆盖的控件，避免重复创建
        private Control currentOverlayControl = null;
        // 清理覆盖控件的方法
        private void CleanupOverlayControl()
        {
            if (currentOverlayControl != null)
            {
                // 移除事件订阅
                if (currentOverlayControl is ComboBox combo)
                {
                    combo.SelectedIndexChanged -= OverlayComboBox_SelectedIndexChanged;
                }
                else if (currentOverlayControl is TextBox textBox)
                {
                    textBox.TextChanged -= OverlayTextBox_TextChanged;
                }

                // 从控件集合中移除并释放资源
                dataGridView1.Controls.Remove(currentOverlayControl);
                currentOverlayControl.Dispose();
                currentOverlayControl = null;
            }

            // 确保默认的编辑控件再次可见
            if (dataGridView1.EditingControl != null)
            {
                dataGridView1.EditingControl.Visible = true;
            }
        }

        private void dataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            CleanupOverlayControl();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string fstr = myDatas[1].Name;
            MessageBox.Show(fstr);
        }
    }
    public class MyData
    {
        public int Age { get; set; } = 110;
        public string Name { get; set; }= "张三";


    }
}