datagridview-bindingsource-data-filtering ソースコード全文
DataGridView_SearchBindingSource.slnx
<Solution> <Project Path="DataGridView_SearchBindingSource/DataGridView_SearchBindingSource.csproj" /></Solution>DataGridView_SearchBindingSource/DataGridView_SearchBindingSource.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_SearchBindingSource/DataGridView_SearchBindingSource.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_SearchBindingSource/Form1.cs
using System.Data;
namespace DataGridView_SearchBindingSource;
public partial class Form1 : Form{ // 1. データの核となる DataTable private DataTable _productTable = new DataTable();
// 2. データとUIを仲介する BindingSource private BindingSource _productBindingSource = new BindingSource();
public Form1() { InitializeComponent(); InitializeData(); InitializeDataGridView(); }
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); _productTable.Rows.Add("P004", "ワイヤレスマウス", 4500); _productTable.Rows.Add("P005", "メカニカルキーボード", 12800); _productTable.Rows.Add("P006", "デスクトップパソコン", 110000); }
private void InitializeDataGridView() { // 3. データ接続の「サンドイッチ構造」を作ります // DataTable → BindingSource → DataGridView の順に紐付けます _productBindingSource.DataSource = _productTable; dataGridView1.DataSource = _productBindingSource;
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
// 4. テキストボックスの文字変更イベント（リアルタイム検索用）を購読 txtSearch.TextChanged += TxtSearch_TextChanged; }
/// <summary> /// 検索テキストボックスの文字が書き換わるたびに呼び出されるイベント /// </summary> private void TxtSearch_TextChanged(object? sender, EventArgs e) { string keyword = txtSearch.Text.Trim();
if (string.IsNullOrEmpty(keyword)) { // 検索ワードが空なら、フィルターを解除して全行表示に戻す _productBindingSource.Filter = ""; } else { // 入力された文字列内のシングルクォーテーションをエスケープ（後述） string safeKeyword = keyword.Replace("'", "''");
// 5. Filterプロパティに条件式を代入（これだけでグリッドが瞬時に絞り込まれます） // ※「Name列」を対象に、キーワードで部分一致（LIKE）検索を行う指示 _productBindingSource.Filter = $"Name LIKE '%{safeKeyword}%'"; } }}DataGridView_SearchBindingSource/Form1.Designer.cs
namespace DataGridView_SearchBindingSource{ 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() { dataGridView1 = new DataGridView(); tableLayoutPanel1 = new TableLayoutPanel(); txtSearch = new TextBox(); tableLayoutPanel2 = new TableLayoutPanel(); label1 = new Label(); ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit(); tableLayoutPanel1.SuspendLayout(); tableLayoutPanel2.SuspendLayout(); SuspendLayout(); // // dataGridView1 // dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize; dataGridView1.Dock = DockStyle.Fill; dataGridView1.Location = new Point(3, 46); dataGridView1.Name = "dataGridView1"; dataGridView1.RowHeadersWidth = 62; dataGridView1.Size = new Size(794, 401); dataGridView1.TabIndex = 0; // // tableLayoutPanel1 // tableLayoutPanel1.ColumnCount = 1; tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F)); tableLayoutPanel1.Controls.Add(dataGridView1, 0, 1); tableLayoutPanel1.Controls.Add(tableLayoutPanel2, 0, 0); tableLayoutPanel1.Dock = DockStyle.Fill; tableLayoutPanel1.Location = new Point(0, 0); tableLayoutPanel1.Name = "tableLayoutPanel1"; tableLayoutPanel1.RowCount = 2; tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 9.555555F)); tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 90.44444F)); tableLayoutPanel1.Size = new Size(800, 450); tableLayoutPanel1.TabIndex = 1; // // txtSearch // txtSearch.Dock = DockStyle.Fill; txtSearch.Location = new Point(143, 3); txtSearch.Name = "txtSearch"; txtSearch.Size = new Size(648, 31); txtSearch.TabIndex = 1; // // tableLayoutPanel2 // tableLayoutPanel2.ColumnCount = 2; tableLayoutPanel2.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 17.6322422F)); tableLayoutPanel2.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 82.36776F)); tableLayoutPanel2.Controls.Add(label1, 0, 0); tableLayoutPanel2.Controls.Add(txtSearch, 1, 0); tableLayoutPanel2.Dock = DockStyle.Fill; tableLayoutPanel2.Location = new Point(3, 3); tableLayoutPanel2.Name = "tableLayoutPanel2"; tableLayoutPanel2.RowCount = 1; tableLayoutPanel2.RowStyles.Add(new RowStyle(SizeType.Percent, 50F)); tableLayoutPanel2.Size = new Size(794, 37); tableLayoutPanel2.TabIndex = 2; // // label1 // label1.AutoSize = true; label1.Dock = DockStyle.Fill; label1.Location = new Point(3, 0); label1.Name = "label1"; label1.Size = new Size(134, 37); label1.TabIndex = 0; label1.Text = "Name 列検索"; // // Form1 // AutoScaleDimensions = new SizeF(10F, 25F); AutoScaleMode = AutoScaleMode.Font; ClientSize = new Size(800, 450); Controls.Add(tableLayoutPanel1); Name = "Form1"; Text = "Form1"; ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit(); tableLayoutPanel1.ResumeLayout(false); tableLayoutPanel2.ResumeLayout(false); tableLayoutPanel2.PerformLayout(); ResumeLayout(false); }
#endregion
private DataGridView dataGridView1; private TableLayoutPanel tableLayoutPanel1; private TextBox txtSearch; private TableLayoutPanel tableLayoutPanel2; private Label label1; }}DataGridView_SearchBindingSource/Form1.resx
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namespace DataGridView_SearchBindingSource{ 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()); } }}