datagridview-input-restriction ソースコード全文

<Solution>
  <Project Path="DataGridView_Input_Restriction/DataGridView_Input_Restriction.csproj" />
</Solution>

<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>

<?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.Data;

namespace DataGridView_Input_Restriction
{
    public partial class Form1 : Form
    {
        private DataTable _dataTable = new DataTable();

        public Form1()
        {
            InitializeComponent();
            InitializeSomeDataGridView();
        }

        private void InitializeSomeDataGridView()
        {
            // テスト用データの準備
            _dataTable.Columns.Add("Code", typeof(string));
            _dataTable.Columns.Add("Name", typeof(string));
            _dataTable.Columns.Add("Price", typeof(int));
            _dataTable.Rows.Add("P001", "ノートパソコン", 120000);
            _dataTable.Rows.Add("P002", "USBメモリ", 2500);

            dataGridView1.DataSource = _dataTable;
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;

            // 編集開始時のイベントを購読
            dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
        }

        /// <summary>
        /// セルが編集状態になったときに発生するイベント
        /// </summary>
        private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            // 編集用コントロールが TextBox であるか確認
            if (e.Control is TextBox textBox)
            {
                // 過去のセルで登録された数値制限イベントを一律で解除する
                // これにより、どの列に移動しても一度「通常の文字入力ができる状態」に戻ります
                textBox.KeyPress -= Cell_KeyPress;

                // 現在編集中の列名を取得
                string columnName = dataGridView1.Columns[dataGridView1.CurrentCell.ColumnIndex].Name;

                if (columnName == "Code")
                {
                    // Code列：最大文字数を5文字に制限（イベントは追加しないため、英数字などが入力可能）
                    textBox.MaxLength = 5;
                }
                else if (columnName == "Price")
                {
                    // Price列：最大文字数を7文字に制限し、数値のみ許可するイベントを再登録
                    textBox.MaxLength = 7;
                    textBox.KeyPress += Cell_KeyPress;
                }
                else
                {
                    // その他の列（Name列など）：文字数制限をデフォルト（制限なし）に戻す
                    textBox.MaxLength = 32767;
                }
            }
        }

        /// <summary>
        /// テキストボックスへのキー入力を制御するイベント（数値のみ許可）
        /// </summary>
        private void Cell_KeyPress(object sender, KeyPressEventArgs e)
        {
            // 入力された文字が「数字」でも「コントロールキー（BackSpaceなど）」でもない場合は入力を無効化
            if (!char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar))
            {
                e.Handled = true;
            }
        }
    }
}

namespace DataGridView_Input_Restriction
{
    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();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
            SuspendLayout();
            //
            // dataGridView1
            //
            dataGridView1.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            dataGridView1.Dock = DockStyle.Fill;
            dataGridView1.Location = new Point(0, 0);
            dataGridView1.Name = "dataGridView1";
            dataGridView1.RowHeadersWidth = 62;
            dataGridView1.Size = new Size(800, 450);
            dataGridView1.TabIndex = 0;
            //
            // Form1
            //
            AutoScaleDimensions = new SizeF(10F, 25F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(800, 450);
            Controls.Add(dataGridView1);
            Name = "Form1";
            Text = "Form1";
            ((System.ComponentModel.ISupportInitialize)dataGridView1).EndInit();
            ResumeLayout(false);
        }

        #endregion

        private DataGridView dataGridView1;
    }
}

<?xml version="1.0" encoding="utf-8"?>
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              <xsd:attribute ref="xml:space" />
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          </xsd:element>
          <xsd:element name="assembly">
            <xsd:complexType>
              <xsd:attribute name="alias" type="xsd:string" />
              <xsd:attribute name="name" type="xsd:string" />
            </xsd:complexType>
          </xsd:element>
          <xsd:element name="data">
            <xsd:complexType>
              <xsd:sequence>
                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
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namespace DataGridView_Input_Restriction
{
    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());
        }
    }
}