datagridview-cross-threading-data-update ソースコード全文

Microsoft Visual Studio Solution File, Format Version 12.00
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  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net9.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <UseWindowsForms>true</UseWindowsForms>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

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<?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.ComponentModel;

namespace DataGridView_Threading_Data_Update
{
    public partial class Form1 : Form
    {
        private BindingList<MemberModel> _members = new();

        public Form1()
        {
            InitializeComponent();
            dataGridView1.DataSource = _members;
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
        }

        // �u�񓯊��Ńf�[�^�ǂݍ��݁v�{�^���̃N���b�N�C�x���g
        private async void btnLoadAsync_Click(object sender, EventArgs e)
        {
            btnLoadAsync.Enabled = false;
            lblStatus.Text = "�f�[�^�擾��...";

            // 1. UI�X���b�h��� Progress �C���X�^���X���쐬�i�R�[���o�b�N���`�j
            var progress = new Progress<MemberModel>(newMember =>
            {
                // ���̒������͎����I�ɁuUI�X���b�h�v�Ŏ��s����邽�߈��S�ł�
                _members.Add(newMember);
            });

            // 2. �o�b�N�O���E���h�X���b�h�ŏd�����������s�iProgress��n���j
            await Task.Run(() => FetchDataFromDatabaseAsync(progress));

            lblStatus.Text = "�ǂݍ��݊���";
            btnLoadAsync.Enabled = true;
        }

        // �[���I�Ƀf�[�^�x�[�X��API����f�[�^���擾����d�������i�ʃX���b�h�œ���j
        private void FetchDataFromDatabaseAsync(IProgress<MemberModel> progress)
        {
            // �l�b�g���[�N�ʐM��d��SQL�N�G���̑���i2�b�ҋ@�j
            Thread.Sleep(2000);
            var data1 = new MemberModel("M001", "�R�c ���Y", "�J����");
            progress.Report(data1); // UI�X���b�h�փf�[�^��͂���

            Thread.Sleep(1000);
            var data2 = new MemberModel("M002", "���� �Ԏq", "�c�ƕ�");
            progress.Report(data2); // UI�X���b�h�փf�[�^��͂���
        }
    }
}

namespace DataGridView_Threading_Data_Update
{
    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();
            btnLoadAsync = new Button();
            lblStatus = new Label();
            tableLayoutPanel1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
            SuspendLayout();
            //
            // tableLayoutPanel1
            //
            tableLayoutPanel1.ColumnCount = 1;
            tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F));
            tableLayoutPanel1.Controls.Add(dataGridView1, 0, 0);
            tableLayoutPanel1.Controls.Add(btnLoadAsync, 0, 2);
            tableLayoutPanel1.Controls.Add(lblStatus, 0, 1);
            tableLayoutPanel1.Dock = DockStyle.Fill;
            tableLayoutPanel1.Location = new Point(0, 0);
            tableLayoutPanel1.Name = "tableLayoutPanel1";
            tableLayoutPanel1.RowCount = 3;
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 71.10198F));
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 14.4485321F));
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 14.4494829F));
            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, 313);
            dataGridView1.TabIndex = 0;
            //
            // btnLoadAsync
            //
            btnLoadAsync.Dock = DockStyle.Fill;
            btnLoadAsync.Location = new Point(3, 387);
            btnLoadAsync.Name = "btnLoadAsync";
            btnLoadAsync.Size = new Size(794, 60);
            btnLoadAsync.TabIndex = 1;
            btnLoadAsync.Text = "データ更新（非同期）";
            btnLoadAsync.UseVisualStyleBackColor = true;
            btnLoadAsync.Click += btnLoadAsync_Click;
            //
            // lblStatus
            //
            lblStatus.AutoSize = true;
            lblStatus.Dock = DockStyle.Fill;
            lblStatus.Location = new Point(3, 319);
            lblStatus.Name = "lblStatus";
            lblStatus.Size = new Size(794, 65);
            lblStatus.TabIndex = 2;
            //
            // Form1
            //
            AutoScaleDimensions = new SizeF(10F, 25F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(800, 450);
            Controls.Add(tableLayoutPanel1);
            Name = "Form1";
            Text = "Form1";
            tableLayoutPanel1.ResumeLayout(false);
            tableLayoutPanel1.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
            ResumeLayout(false);
        }

        #endregion

        private TableLayoutPanel tableLayoutPanel1;
        private DataGridView dataGridView1;
        private Button btnLoadAsync;
        private Label lblStatus;
    }
}

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;

namespace DataGridView_Threading_Data_Update
{
    /// <summary>
    /// メンバー情報を管理し、プロパティの変更を DataGridView などの UI に自動通知するデータモデルクラスです。
    /// </summary>
    public class MemberModel : INotifyPropertyChanged
    {
        // INotifyPropertyChanged インターフェースの変更通知イベント
        public event PropertyChangedEventHandler? PropertyChanged;

        private string _id = string.Empty;
        private string _name = string.Empty;
        private string _department = string.Empty;

        /// <summary>
        /// メンバーIDを取得または設定します。
        /// </summary>
        public string Id
        {
            get => _id;
            set => SetProperty(ref _id, value);
        }

        /// <summary>
        /// 氏名を取得または設定します。
        /// </summary>
        public string Name
        {
            get => _name;
            set => SetProperty(ref _name, value);
        }

        /// <summary>
        /// 所属部署を取得または設定します。
        /// </summary>
        public string Department
        {
            get => _department;
            set => SetProperty(ref _department, value);
        }

        /// <summary>
        /// MemberModel クラスの新しいインスタンスを初期化します。
        /// </summary>
        /// <param name="id">メンバーID</param>
        /// <param name="name">氏名</param>
        /// <param name="department">所属部署</param>
        public MemberModel(string id, string name, string department)
        {
            _id = id;
            _name = name;
            _department = department;
        }

        /// <summary>
        /// プロパティの値を安全に更新し、変更があった場合のみ PropertyChanged イベントを発行します。
        /// </summary>
        /// <typeparam name="T">プロパティの型</typeparam>
        /// <param name="storage">バッキングフィールドへの参照</param>
        /// <param name="value">変更後の新しい値</param>
        /// <param name="propertyName">プロパティ名（呼び出し元のプロパティ名が自動で設定されます）</param>
        protected void SetProperty<T>(ref T storage, T value, [CallerMemberName] string? propertyName = null)
        {
            // 変更前と変更後の値が同じであれば何もしない（無駄な描画処理をスキップ）
            if (Equals(storage, value)) return;

            // 値を更新
            storage = value;

            // UI（DataGridView）に対して変更を通知
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

namespace DataGridView_Threading_Data_Update
{
    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());
        }
    }
}