datagridview-combobox-column ソースコード全文

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# Visual Studio Version 17
VisualStudioVersion = 17.14.37314.3 d17.14
MinimumVisualStudioVersion = 10.0.40219.1
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  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net9.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <UseWindowsForms>true</UseWindowsForms>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

</Project>

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <ItemGroup>
        <Compile Update="Form1.cs">
            <SubType>Form</SubType>
        </Compile>
    </ItemGroup>
</Project>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DataGridView_ComboBoxColumn
{
    // コンボボックスの選択肢となる部署モデル
    public class DepartmentModel
    {
        public string Code { get; set; }
        public string Name { get; set; }

        public DepartmentModel(string code, string name)
        {
            Code = code;
            Name = name;
        }
    }
}

using System.ComponentModel;
using System.Windows.Forms;

namespace DataGridView_ComboBoxColumn
{
    public partial class Form1 : Form
    {
        // 社員一覧のリスト
        private BindingList<MemberModel> _members = new();

        // コンボボックスの選択肢となる部署マスタのリスト
        private List<DepartmentModel> _departments = new();

        public Form1()
        {
            InitializeComponent();
            InitializeDataGridView();
        }

        private void InitializeDataGridView()
        {
            // 1. 部署マスタ（選択肢）の準備
            _departments.Add(new DepartmentModel("D01", "開発部"));
            _departments.Add(new DepartmentModel("D02", "営業部"));
            _departments.Add(new DepartmentModel("D03", "総務部"));

            // 2. 初期データの登録
            _members.Add(new MemberModel("M001", "山田 太郎", "D01"));
            _members.Add(new MemberModel("M002", "佐藤 花子", "D02"));

            // 3. 先にコンボボックス列を作成して DataGridView に追加する
            var comboCol = new DataGridViewComboBoxColumn();
            comboCol.DataPropertyName = nameof(MemberModel.DepartmentCode); // 社員モデルのバインド先
            comboCol.HeaderText = "所属部署";
            comboCol.DataSource = _departments;                           // 選択肢のデータ源
            comboCol.ValueMember = nameof(DepartmentModel.Code);          // 裏側の値（部署コード）
            comboCol.DisplayMember = nameof(DepartmentModel.Name);        // 画面に見せる文字（部署名）

            dataGridView1.Columns.Add(comboCol);

            // 4. その他の列を自動生成してデータソースを設定
            dataGridView1.DataSource = _members;
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;

            // 選択を変更した瞬間に値を確定させるイベント
            dataGridView1.CurrentCellDirtyStateChanged += DataGridView1_CurrentCellDirtyStateChanged;
        }

        // セルの状態が「編集中」になった瞬間に呼び出されるイベント
        private void DataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentCell is DataGridViewComboBoxCell)
            {
                // まだセルにフォーカスが残っていても、強制的に編集を確定（コミット）させる
                dataGridView1.EndEdit();
            }
        }

        // 「設定された値を取得」ボタンのクリックイベント
        private void btnGetValue_Click(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentRow == null) return;

            // 設定した値の取得

            // パターンA：セルの Value プロパティから直接取得する
            // （ValueMember に指定した "DepartmentCode" の値が取得できます）
            string codeFromCell = dataGridView1.CurrentRow.Cells[0].Value?.ToString() ?? "";

            // パターンB：バインド元のデータモデルから型安全に取得する（推奨）
            if (dataGridView1.CurrentRow.DataBoundItem is MemberModel selectedMember)
            {
                string codeFromModel = selectedMember.DepartmentCode;

                // どちらの方法でも、現在選択されている部署コード（"D01" など）が確実に取得できます
                MessageBox.Show($"セルから取得した部署コード: {codeFromCell}\n" +
                                $"モデルから取得した部署コード: {codeFromModel}");
            }
        }
    }
}

namespace DataGridView_ComboBoxColumn
{
    partial class Form1
    {
        /// <summary>
        ///  Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <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 Windows Form 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()
        {
            tableLayoutPanel1 = new TableLayoutPanel();
            btnGetValue = new Button();
            dataGridView1 = new DataGridView();
            tableLayoutPanel1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
            SuspendLayout();
            //
            // tableLayoutPanel1
            //
            tableLayoutPanel1.ColumnCount = 1;
            tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            tableLayoutPanel1.Controls.Add(btnGetValue, 0, 1);
            tableLayoutPanel1.Controls.Add(dataGridView1, 0, 0);
            tableLayoutPanel1.Dock = DockStyle.Fill;
            tableLayoutPanel1.Location = new Point(0, 0);
            tableLayoutPanel1.Name = "tableLayoutPanel1";
            tableLayoutPanel1.RowCount = 2;
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 87.1111145F));
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 12.8888893F));
            tableLayoutPanel1.Size = new Size(800, 450);
            tableLayoutPanel1.TabIndex = 0;
            //
            // btnGetValue
            //
            btnGetValue.Dock = DockStyle.Fill;
            btnGetValue.Location = new Point(3, 395);
            btnGetValue.Name = "btnGetValue";
            btnGetValue.Size = new Size(794, 52);
            btnGetValue.TabIndex = 0;
            btnGetValue.Text = "データ取得";
            btnGetValue.UseVisualStyleBackColor = true;
            btnGetValue.Click += btnGetValue_Click;
            //
            // dataGridView1
            //
            dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            dataGridView1.Dock = DockStyle.Fill;
            dataGridView1.Location = new Point(3, 3);
            dataGridView1.Name = "dataGridView1";
            dataGridView1.RowHeadersWidth = 62;
            dataGridView1.Size = new Size(794, 386);
            dataGridView1.TabIndex = 1;
            //
            // Form1
            //
            AutoScaleDimensions = new SizeF(10F, 25F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(800, 450);
            Controls.Add(tableLayoutPanel1);
            Name = "Form1";
            Text = "Form1";
            tableLayoutPanel1.ResumeLayout(false);
            ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
            ResumeLayout(false);
        }

        #endregion

        private TableLayoutPanel tableLayoutPanel1;
        private Button btnGetValue;
        private DataGridView dataGridView1;
    }
}

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namespace DataGridView_ComboBoxColumn
{
    // グリッドの行にバインドする社員モデル
    public class MemberModel
    {
        public string Id { get; set; }
        public string Name { get; set; }
        public string DepartmentCode { get; set; } // コンボボックスの ValueMember と連動

        public MemberModel(string id, string name, string departmentCode)
        {
            Id = id;
            Name = name;
            DepartmentCode = departmentCode;
        }
    }
}

namespace DataGridView_ComboBoxColumn
{
    internal static class Program
    {
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // To customize application configuration such as set high DPI settings or default font,
            // see https://aka.ms/applicationconfiguration.
            ApplicationConfiguration.Initialize();
            Application.Run(new Form1());
        }
    }
}