datagridview-checkbox-column ソースコード全文
DataGridView_CheckboxColumn.sln
Microsoft Visual Studio Solution File, Format Version 12.00# Visual Studio Version 17VisualStudioVersion = 17.14.37314.3 d17.14MinimumVisualStudioVersion = 10.0.40219.1Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataGridView_CheckboxColumn", "DataGridView_CheckboxColumn\DataGridView_CheckboxColumn.csproj", "{A84D6459-3F6B-4E14-B7EC-95093FE19B8D}"EndProjectGlobal GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU Release|Any CPU = Release|Any CPU EndGlobalSection GlobalSection(ProjectConfigurationPlatforms) = postSolution {A84D6459-3F6B-4E14-B7EC-95093FE19B8D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU {A84D6459-3F6B-4E14-B7EC-95093FE19B8D}.Debug|Any CPU.Build.0 = Debug|Any CPU {A84D6459-3F6B-4E14-B7EC-95093FE19B8D}.Release|Any CPU.ActiveCfg = Release|Any CPU {A84D6459-3F6B-4E14-B7EC-95093FE19B8D}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection GlobalSection(ExtensibilityGlobals) = postSolution SolutionGuid = {0E1E664D-8A5F-4274-952F-23A916991236} EndGlobalSectionEndGlobalDataGridView_CheckboxColumn/DataGridView_CheckboxColumn.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup> <OutputType>WinExe</OutputType> <TargetFramework>net9.0-windows</TargetFramework> <Nullable>enable</Nullable> <UseWindowsForms>true</UseWindowsForms> <ImplicitUsings>enable</ImplicitUsings> </PropertyGroup>
</Project>DataGridView_CheckboxColumn/DataGridView_CheckboxColumn.csproj.user
<?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>DataGridView_CheckboxColumn/Form1.cs
using System.ComponentModel;
namespace DataGridView_CheckboxColumn{ public partial class Form1 : Form { // BindingListの宣言（クラスのメンバ変数として保持します） private BindingList<ProductModel> _products = new();
public Form1() { InitializeComponent(); InitializeDataGridView(); }
private void InitializeDataGridView() { // サンプルデータの登録 _products.Add(new ProductModel(false, "P001", "ノートパソコン")); _products.Add(new ProductModel(false, "P002", "USBメモリ"));
dataGridView1.DataSource = _products; dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
// ⭕ 重要：チェックを入れた「瞬間」にデータソースに値を確定させるためのイベント dataGridView1.CurrentCellDirtyStateChanged += DataGridView1_CurrentCellDirtyStateChanged; }
// 1. セルの状態が「編集中（Dirty）」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) { // 現在アクティブなセルがチェックボックス列の場合 if (dataGridView1.CurrentCell is DataGridViewCheckBoxCell) { // ⭕ まだフォーカスがセルに残っていても、強制的に編集を確定（コミット）させる dataGridView1.EndEdit(); } }
// 「選択された項目を表示」ボタンのクリックイベント private void btnShowSelected_Click(object sender, EventArgs e) { var selectedNames = new List<string>();
// データソース側を走査して、チェック（IsSelected == true）がついているものを抽出 foreach (var product in _products) { if (product.IsSelected) { selectedNames.Add(product.Name); } }
if (selectedNames.Count > 0) { MessageBox.Show($"選択された商品: {string.Join(", ", selectedNames)}"); } else { MessageBox.Show("何も選択されていません。"); } } }
public class ProductModel { // bool型のプロパティは自動的にチェックボックス列になります public bool IsSelected { get; set; } public string Code { get; set; } public string Name { get; set; }
public ProductModel(bool isSelected, string code, string name) { IsSelected = isSelected; Code = code; Name = name; } }}DataGridView_CheckboxColumn/Form1.Designer.cs
namespace DataGridView_CheckboxColumn{ 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(); dataGridView1 = new DataGridView(); btnShowSelected = new Button(); tableLayoutPanel1.SuspendLayout(); ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit(); SuspendLayout(); // // tableLayoutPanel1 // tableLayoutPanel1.ColumnCount = 1; tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F)); tableLayoutPanel1.Controls.Add(dataGridView1, 0, 0); tableLayoutPanel1.Controls.Add(btnShowSelected, 0, 1); tableLayoutPanel1.Dock = DockStyle.Fill; tableLayoutPanel1.Location = new Point(0, 0); tableLayoutPanel1.Name = "tableLayoutPanel1"; tableLayoutPanel1.RowCount = 2; tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 89.3333359F)); tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 10.666667F)); tableLayoutPanel1.Size = new Size(800, 450); tableLayoutPanel1.TabIndex = 0; // // 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, 396); dataGridView1.TabIndex = 0; // // btnShowSelected // btnShowSelected.Dock = DockStyle.Fill; btnShowSelected.Location = new Point(3, 405); btnShowSelected.Name = "btnShowSelected"; btnShowSelected.Size = new Size(794, 42); btnShowSelected.TabIndex = 1; btnShowSelected.Text = "選択された項目を表示"; btnShowSelected.UseVisualStyleBackColor = true; btnShowSelected.Click += btnShowSelected_Click; // // 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 DataGridView dataGridView1; private Button btnShowSelected; }}DataGridView_CheckboxColumn/Form1.resx
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namespace DataGridView_CheckboxColumn{ 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()); } }}