combobox-bind-list ソースコード全文
ComboBox_ListBinding.slnx
<Solution> <Project Path="ComboBox_ListBinding/ComboBox_ListBinding.csproj" /></Solution>ComboBox_ListBinding/ComboBox_ListBinding.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>ComboBox_ListBinding/ComboBox_ListBinding.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>ComboBox_ListBinding/Form1.cs
namespace ComboBox_ListBinding{ public partial class Form1 : Form { // 独自のクラスを持つ List<T> を定義 private List<Department> _departmentList = new List<Department>();
public Form1() { InitializeComponent(); InitializeComboBox(); }
private void InitializeComboBox() { // 1. マスタデータの準備 _departmentList.Add(new Department("D001", "開発部")); _departmentList.Add(new Department("D002", "営業部")); _departmentList.Add(new Department("D003", "総務部"));
// 2. バインドするプロパティ名を文字列で指定 // 画面に表示するプロパティ名 comboBox1.DisplayMember = "Name"; // 裏側で保持する値（キー）のプロパティ名 comboBox1.ValueMember = "Code";
// 3. データソースに List<T> を直接バインド comboBox1.DataSource = _departmentList;
// 4. 選択が変更されたときのイベントを購読 comboBox1.SelectedIndexChanged += ComboBox1_SelectedIndexChanged; }
/// <summary> /// コンボボックスの選択が切り替わったときのイベント /// </summary> private void ComboBox1_SelectedIndexChanged(object? sender, EventArgs e) { // 選択された項目の「ValueMember」に指定した値を直接取得 if (comboBox1.SelectedValue != null) { string selectedCode = comboBox1.SelectedValue.ToString() ?? "";
// ログ出力などで確認用（実務では検索クエリの条件などに利用します） System.Diagnostics.Debug.WriteLine($"選択された部署コード: {selectedCode}"); } } }
/// <summary> /// コンボボックスに表示したいデータを保持するモデルクラス /// </summary> public class Department { // フィールドではなく、プロパティ（get; set;）として定義します public string Code { get; set; } = string.Empty; public string Name { get; set; } = string.Empty;
public Department(string code, string name) { Code = code; Name = name; } }}ComboBox_ListBinding/Form1.Designer.cs
namespace ComboBox_ListBinding{ 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() { comboBox1 = new ComboBox(); SuspendLayout(); // // comboBox1 // comboBox1.FormattingEnabled = true; comboBox1.Location = new Point(91, 55); comboBox1.Name = "comboBox1"; comboBox1.Size = new Size(182, 33); comboBox1.TabIndex = 0; // // Form1 // AutoScaleDimensions = new SizeF(10F, 25F); AutoScaleMode = AutoScaleMode.Font; ClientSize = new Size(800, 450); Controls.Add(comboBox1); Name = "Form1"; Text = "Form1"; ResumeLayout(false); }
#endregion
private ComboBox comboBox1; }}ComboBox_ListBinding/Form1.resx
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Each data row contains a name, and value. The row also contains a type or mimetype. Type corresponds to a .NET class that support text/value conversion through the TypeConverter architecture. Classes that don't support this are serialized and stored with the mimetype set.
The mimetype is used for serialized objects, and tells the ResXResourceReader how to depersist the object. This is currently not extensible. For a given mimetype the value must be set accordingly:
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namespace ComboBox_ListBinding{ 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()); } }}