DataGridView將TextBoxColumn轉換為ComboBoxColumn

Question

我有一個簡單的數據庫（SQL），汽車表有六個字段：ID，所有者，年份，顏色，品牌和型號。 顏色表就是：ID，ColorName。

我有一個帶有DataGridView的窗體。 當我將Cars表綁定到DataGridView時，到此為止一切正常。

現在，我正在嘗試使DataGridView中的“顏色”列成為用於編輯的comboBox，並僅列出我的“顏色表”中的顏色。 我可以制作一個comboBox並將其添加到DataGridView，但我想只是“轉換”已包含數據的列。

在此先感謝您提供的任何幫助。

using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace EditingCells
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            var myDataBase = new CarsEntities();
            List<MyCar> data = myDataBase.MyCars.OrderBy(o => o.Owner).ToList();

            //dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = data;

            const int index = 2; // Column Index for Color

            List<string> myColor = myDataBase.Colors.Select(s => s.Color1).ToList();

            var comboBoxColumn = new DataGridViewComboBoxColumn
            {
                DataSource = myColor,
                DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing,
                AutoComplete = true,
            };
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            MessageBox.Show(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].EditType.ToString());
        }
    }
}

Answer 1

基於此主題->“將Databound DataGridView上的單元格類型更改為Custom DataGridViewCell Type ”主題，建議您進行以下操作：

public partial class Form1 : Form
{
    List<string> availableCarColors = new List<string>();
    List<MyCar> data = new List<MyCar>();

    public Form1()
    {
        InitializeComponent();

        availableCarColors.Add("Red");
        availableCarColors.Add("Blue");

        data.Add(new MyCar("Lexus", "Blue"));
        data.Add(new MyCar("BMW", "Red"));

        DataGridViewTextBoxColumn colModel = new DataGridViewTextBoxColumn();
        colModel.Name = "Model";                //Header Text
        colModel.DataPropertyName = "Model";    //Property Name of my car class

        DataGridViewComboBoxColumn colColor = new DataGridViewComboBoxColumn();
        colColor.Name = "Color";
        colColor.DataPropertyName = "Color";
        colColor.DataSource = availableCarColors;

        dataGridView1.AutoGenerateColumns = false;
        dataGridView1.Columns.AddRange(new DataGridViewColumn[] {colModel, colColor});
        dataGridView1.DataSource = data;
    }

    class MyCar
    {
        public string Model { get; set; }
        public string Color { get; set; }

        public MyCar(string model, string color)
        {
            Model = model;
            Color = color;
        }
    }
}

Answer 2

您必須使用以下設置使用“顏色”表數據填充DataGridViewComboBoxColumn：

• ValueMember ：ID
• DisplayMember ：ColorName

Answer 3

我只想發布如何使用@Tezzo的解決方案來獲得所需的結果：

using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace EditingCells
{
    public partial class Form1 : Form
    {
        private readonly CarsEntities _myDataBase = new CarsEntities();

        public Form1()
        {
            InitializeComponent();

            List<MyCar> myData = _myDataBase.MyCars.ToList();

            // Yes, you have do make Columns manually.
            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.DataSource = myData;

            List<Color> myColors = _myDataBase.Colors.ToList();

            var carOwner = new DataGridViewTextBoxColumn
                {
                    DataPropertyName = "Owner",
                    HeaderText = @"Owner",
                    Name = "Owner",
                };
            dataGridView1.Columns.Add(carOwner);

            var carColor = new DataGridViewComboBoxColumn
                {
                    // Field Name where existing data is stored
                    DataPropertyName = "CarColor",
                    HeaderText = @"Color",
                    Name = "Color",
                    DataSource = myColors,
                    DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing,
                    AutoComplete = true,

                    // Field value from DataSource to store in Car.Color field
                    ValueMember = "ColorName",

                    // Field value from DataSource to show in DataGridView Column
                    DisplayMember = "ColorName",
                };
            dataGridView1.Columns.Add(carColor);
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            _myDataBase.SaveChanges();
        }
    }
}