datagridview-cell-editing-control-ime ソースコード全文

<Solution>
  <Project Path="DataGridView_IME_Editing/DataGridView_IME_Editing.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_IME_Editing
{
    public partial class Form1 : Form
    {
        private DataTable _dataTable = new DataTable();

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

        private void InitializeDataGridView()
        {
            // 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;

            // セルにフォーカスが移った時のイベントを購読
            dataGridView1.CellEnter += DataGridView1_CellEnter;
        }

        /// <summary>
        /// セルにフォーカスが移動したときに発生するイベント
        /// </summary>
        private void DataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
        {
            // ヘッダー行などの場合は処理をスキップ
            if (e.RowIndex < 0 || e.ColumnIndex < 0) return;

            // 現在選択された列名を取得
            string columnName = dataGridView1.Columns[e.ColumnIndex].Name;

            // ⭕ 編集が始まる前に、DataGridView本体のIMEモードを切り替えます
            // これにより、セルを選択してそのまま文字を打ち始めた際の「1文字目の突き抜け」を防ぎます
            if (columnName == "Code")
            {
                // Code列：半角入力を想定（IMEをオフ）
                dataGridView1.ImeMode = ImeMode.Off;
            }
            else if (columnName == "Name")
            {
                // Name列：全角ひらがな入力を想定（IMEをオン）
                dataGridView1.ImeMode = ImeMode.Hiragana;
            }
            else
            {
                // その他の列：既定の状態に戻す
                dataGridView1.ImeMode = ImeMode.NoControl;
            }
        }
    }
}

namespace DataGridView_IME_Editing
{
    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;
    }
}

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                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
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namespace DataGridView_IME_Editing
{
    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());
        }
    }
}