datagridview-hide-column ソースコード全文
DataGridView_Column_Visibility.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_Column_Visibility", "DataGridView_Column_Visibility\DataGridView_Column_Visibility.csproj", "{59BCEC01-30A6-436B-BD5A-908BE95A32ED}"EndProjectGlobal GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU Release|Any CPU = Release|Any CPU EndGlobalSection GlobalSection(ProjectConfigurationPlatforms) = postSolution {59BCEC01-30A6-436B-BD5A-908BE95A32ED}.Debug|Any CPU.ActiveCfg = Debug|Any CPU {59BCEC01-30A6-436B-BD5A-908BE95A32ED}.Debug|Any CPU.Build.0 = Debug|Any CPU {59BCEC01-30A6-436B-BD5A-908BE95A32ED}.Release|Any CPU.ActiveCfg = Release|Any CPU {59BCEC01-30A6-436B-BD5A-908BE95A32ED}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection GlobalSection(ExtensibilityGlobals) = postSolution SolutionGuid = {9D4EDE89-401F-442C-A3CE-4E38B28FC650} EndGlobalSectionEndGlobalDataGridView_Column_Visibility/DataGridView_Column_Visibility.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_Column_Visibility/DataGridView_Column_Visibility.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_Column_Visibility/Form1.cs
using System.ComponentModel;
namespace DataGridView_Column_Visibility{ public partial class Form1 : Form { private BindingList<MemberModel> _members = new();
public Form1() { InitializeComponent(); InitializeDataGridView(); }
private void InitializeDataGridView() { // サンプルデータの追加 _members.Add(new MemberModel("M001", "山田 太郎", "開発部")); _members.Add(new MemberModel("M002", "佐藤 花子", "営業部"));
dataGridView1.DataSource = _members; dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
// ⭕ 明示的に「Id」列を非表示にする // ※列名にはデータモデルのプロパティ名が自動で割り当てられます if (dataGridView1.Columns["Id"] != null) { dataGridView1.Columns["Id"].Visible = false; } }
// 「選択行のIDを取得」ボタンのクリックイベント private void btnGetId_Click(object sender, EventArgs e) { if (dataGridView1.CurrentRow == null) return;
// パターンA：非表示のセル（Cells["Id"]）から直接 Value を取得する string idFromCell = dataGridView1.CurrentRow.Cells["Id"].Value?.ToString() ?? "";
// パターンB：バインド元のデータモデル（MemberModel）から直接取得する（推奨） if (dataGridView1.CurrentRow.DataBoundItem is MemberModel member) { string idFromModel = member.Id;
// 画面で非表示になっていても、どちらの方法でも正しく値が取得できます MessageBox.Show($"セルから取得: {idFromCell}\nモデルから取得: {idFromModel}"); } } }
// データモデルクラス public class MemberModel { public string Id { get; set; } public string Name { get; set; } public string Department { get; set; }
public MemberModel(string id, string name, string department) { Id = id; Name = name; Department = department; } }}DataGridView_Column_Visibility/Form1.Designer.cs
namespace DataGridView_Column_Visibility{ 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(); btnGetId = 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(btnGetId, 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, 87.77778F)); tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 12.2222223F)); 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, 389); dataGridView1.TabIndex = 0; // // btnGetId // btnGetId.Dock = DockStyle.Fill; btnGetId.Location = new Point(3, 398); btnGetId.Name = "btnGetId"; btnGetId.Size = new Size(794, 49); btnGetId.TabIndex = 1; btnGetId.Text = "ID データを取得"; btnGetId.UseVisualStyleBackColor = true; btnGetId.Click += btnGetId_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 btnGetId; }}DataGridView_Column_Visibility/Form1.resx
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namespace DataGridView_Column_Visibility{ 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()); } }}