datagridview-bindingsource-two-way-binding ソースコード全文
DataGridView_MasterDetailBinding.slnx
<Solution> <Project Path="DataGridView_MasterDetailBinding/DataGridView_MasterDetailBinding.csproj" /></Solution>DataGridView_MasterDetailBinding/DataGridView_MasterDetailBinding.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup> <OutputType>WinExe</OutputType> <TargetFramework>net10.0-windows</TargetFramework> <Nullable>enable</Nullable> <UseWindowsForms>true</UseWindowsForms> <ImplicitUsings>enable</ImplicitUsings> </PropertyGroup>
</Project>DataGridView_MasterDetailBinding/DataGridView_MasterDetailBinding.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_MasterDetailBinding/Form1.cs
using System.Data;
namespace DataGridView_MasterDetailBinding;
public partial class Form1 : Form{ private DataTable _productTable = new DataTable();
// データと複数のUIコントロールを仲介する、共通の BindingSource private BindingSource _productBindingSource = new BindingSource();
public Form1() { InitializeComponent(); InitializeData(); InitializeDataGridView(); BindDetailControls(); // 詳細入力欄の連動設定を呼び出す }
private void InitializeData() { // テスト用データの準備 _productTable.Columns.Add("Code", typeof(string)); _productTable.Columns.Add("Name", typeof(string)); _productTable.Columns.Add("Price", typeof(int));
_productTable.Rows.Add("P001", "ノートパソコン", 120000); _productTable.Rows.Add("P002", "USBメモリ", 2500); _productTable.Rows.Add("P003", "液晶モニター", 35000);
// 詳細欄のテキストボックスが「フォーカスアウト（確定）」した時のイベントを購読 txtName.Validated += DetailTextBox_Validated; txtPrice.Validated += DetailTextBox_Validated; }
/// <summary> /// 詳細欄のテキストボックスの入力が確定した瞬間に呼び出される /// </summary> private void DetailTextBox_Validated(object? sender, EventArgs e) { // 行の編集を確定する _productBindingSource.EndEdit(); }
private void InitializeDataGridView() { // 階層構造でデータソースを紐付ける（DataTable ➡️ BindingSource ➡️ DataGridView） _productBindingSource.DataSource = _productTable; dataGridView1.DataSource = _productBindingSource;
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill; }
/// <summary> /// 各テキストボックスと BindingSource をデータバインディングで結びつける /// </summary> private void BindDetailControls() { // DataBindings.Add メソッドを使い、コントロールのプロパティと、 // 共通の BindingSource 内にある特定の列名（プロパティ名）をペアリングします。
// 1. 商品コードの連動（編集不可にするため ReadOnly に設定） txtCode.DataBindings.Add("Text", _productBindingSource, "Code", true); txtCode.ReadOnly = true;
// 2. 商品名の連動（DataSourceUpdateMode を明示的に指定：後述） txtName.DataBindings.Add("Text", _productBindingSource, "Name", true, DataSourceUpdateMode.OnValidation);
// 3. 価格の連動 txtPrice.DataBindings.Add("Text", _productBindingSource, "Price", true, DataSourceUpdateMode.OnValidation); }}DataGridView_MasterDetailBinding/Form1.Designer.cs
namespace DataGridView_MasterDetailBinding{ 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(); tableLayoutPanel2 = new TableLayoutPanel(); panel3 = new Panel(); txtPrice = new TextBox(); labelPrice = new Label(); panel2 = new Panel(); txtName = new TextBox(); labelName = new Label(); panel1 = new Panel(); txtCode = new TextBox(); labelCode = new Label(); tableLayoutPanel1.SuspendLayout(); ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit(); tableLayoutPanel2.SuspendLayout(); panel3.SuspendLayout(); panel2.SuspendLayout(); panel1.SuspendLayout(); SuspendLayout(); // // tableLayoutPanel1 // tableLayoutPanel1.ColumnCount = 2; tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 75.5F)); tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 24.5F)); tableLayoutPanel1.Controls.Add(dataGridView1, 0, 0); tableLayoutPanel1.Controls.Add(tableLayoutPanel2, 1, 0); tableLayoutPanel1.Dock = DockStyle.Fill; tableLayoutPanel1.Location = new Point(0, 0); tableLayoutPanel1.Name = "tableLayoutPanel1"; tableLayoutPanel1.RowCount = 1; tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 50F)); 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(598, 444); dataGridView1.TabIndex = 0; // // tableLayoutPanel2 // tableLayoutPanel2.ColumnCount = 1; tableLayoutPanel2.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F)); tableLayoutPanel2.Controls.Add(panel3, 0, 2); tableLayoutPanel2.Controls.Add(panel2, 0, 1); tableLayoutPanel2.Controls.Add(panel1, 0, 0); tableLayoutPanel2.Dock = DockStyle.Fill; tableLayoutPanel2.Location = new Point(607, 3); tableLayoutPanel2.Name = "tableLayoutPanel2"; tableLayoutPanel2.RowCount = 3; tableLayoutPanel2.RowStyles.Add(new RowStyle(SizeType.Percent, 33.33F)); tableLayoutPanel2.RowStyles.Add(new RowStyle(SizeType.Percent, 33.33F)); tableLayoutPanel2.RowStyles.Add(new RowStyle(SizeType.Percent, 33.34F)); tableLayoutPanel2.Size = new Size(190, 444); tableLayoutPanel2.TabIndex = 1; // // panel3 // panel3.Controls.Add(txtPrice); panel3.Controls.Add(labelPrice); panel3.Dock = DockStyle.Fill; panel3.Location = new Point(3, 297); panel3.Name = "panel3"; panel3.Size = new Size(184, 144); panel3.TabIndex = 2; // // txtPrice // txtPrice.Location = new Point(22, 59); txtPrice.Name = "txtPrice"; txtPrice.Size = new Size(150, 31); txtPrice.TabIndex = 1; // // labelPrice // labelPrice.AutoSize = true; labelPrice.Location = new Point(22, 31); labelPrice.Name = "labelPrice"; labelPrice.Size = new Size(49, 25); labelPrice.TabIndex = 0; labelPrice.Text = "Price"; // // panel2 // panel2.Controls.Add(txtName); panel2.Controls.Add(labelName); panel2.Dock = DockStyle.Fill; panel2.Location = new Point(3, 150); panel2.Name = "panel2"; panel2.Size = new Size(184, 141); panel2.TabIndex = 1; // // txtName // txtName.Location = new Point(22, 59); txtName.Name = "txtName"; txtName.Size = new Size(150, 31); txtName.TabIndex = 1; // // labelName // labelName.AutoSize = true; labelName.Location = new Point(22, 31); labelName.Name = "labelName"; labelName.Size = new Size(59, 25); labelName.TabIndex = 0; labelName.Text = "Name"; // // panel1 // panel1.Controls.Add(txtCode); panel1.Controls.Add(labelCode); panel1.Dock = DockStyle.Fill; panel1.Location = new Point(3, 3); panel1.Name = "panel1"; panel1.Size = new Size(184, 141); panel1.TabIndex = 0; // // txtCode // txtCode.Location = new Point(22, 59); txtCode.Name = "txtCode"; txtCode.Size = new Size(150, 31); txtCode.TabIndex = 1; // // labelCode // labelCode.AutoSize = true; labelCode.Location = new Point(22, 31); labelCode.Name = "labelCode"; labelCode.Size = new Size(54, 25); labelCode.TabIndex = 0; labelCode.Text = "Code"; // // 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(); tableLayoutPanel2.ResumeLayout(false); panel3.ResumeLayout(false); panel3.PerformLayout(); panel2.ResumeLayout(false); panel2.PerformLayout(); panel1.ResumeLayout(false); panel1.PerformLayout(); ResumeLayout(false); }
#endregion
private TableLayoutPanel tableLayoutPanel1; private DataGridView dataGridView1; private TableLayoutPanel tableLayoutPanel2; private Panel panel3; private TextBox txtPrice; private Label labelPrice; private Panel panel2; private TextBox txtName; private Label labelName; private Panel panel1; private TextBox txtCode; private Label labelCode; }}DataGridView_MasterDetailBinding/Form1.resx
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namespace DataGridView_MasterDetailBinding{ 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()); } }}