datagridview-add-row-trouble-shooting ソースコード全文

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.14.36930.0 d17.14
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WaterMargin.WinForms.DgvRowAdd", "WaterMargin.WinForms.DgvRowAdd\WaterMargin.WinForms.DgvRowAdd.csproj", "{C9C1A3DC-9ACE-4567-B7DC-AD57F3CA80EB}"
EndProject
Global
  GlobalSection(SolutionConfigurationPlatforms) = preSolution
    Debug|Any CPU = Debug|Any CPU
    Release|Any CPU = Release|Any CPU
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    {C9C1A3DC-9ACE-4567-B7DC-AD57F3CA80EB}.Debug|Any CPU.Build.0 = Debug|Any CPU
    {C9C1A3DC-9ACE-4567-B7DC-AD57F3CA80EB}.Release|Any CPU.ActiveCfg = Release|Any CPU
    {C9C1A3DC-9ACE-4567-B7DC-AD57F3CA80EB}.Release|Any CPU.Build.0 = Release|Any CPU
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using System.Data;

namespace WaterMargin.WinForms.DgvRowAdd
{
    public partial class Form1 : Form
    {
        private DataTable myTable;

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

        private void SetupDataGridView()
        {
            // DataTable �̍쐬
            myTable = new DataTable();
            myTable.Columns.Add("ID", typeof(int));
            myTable.Columns.Add("���O", typeof(string));

            // �����f�[�^�̒lj�
            myTable.Rows.Add(1, "�c��");
            myTable.Rows.Add(2, "����");

            // DataGridView �� DataTable ���o�C���h����
            this.dataGridView1.DataSource = myTable;

            // ���[�U�[�ɂ��V�K�s�̒lj������‚���
            this.dataGridView1.AllowUserToAddRows = true;
        }

        private void btnAddOk_Click(object sender, EventArgs e)
        {
            // DataSource ���� DataTable ���擾
            DataTable? dt = this.dataGridView1.DataSource as DataTable;

            // DataTable �̃X�L�[�}�ɍ��킹���V�����s���쐬
            DataRow row = dt.NewRow();
            row["ID"] = dt.Rows.Count + 1;
            row["���O"] = "�V�������[�U�[";

            // DataTable �ɍs��lj��iDataGridView �̕\���������ōX�V����܂��j
            dt.Rows.Add(row);
        }

        private void btnAddNg_Click(object sender, EventArgs e)
        {
            try
            {
                // DataGridView �ɒ��ڍs��lj����悤�Ƃ���ƃG���[���������܂�
                this.dataGridView1.Rows.Add(99, "�G���[�e�X�g");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "�G���[����", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}

namespace WaterMargin.WinForms.DgvRowAdd
{
    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();
            tableLayoutPanel2 = new TableLayoutPanel();
            btnAddOk = new Button();
            btnAddNg = new Button();
            ((System.ComponentModel.ISupportInitialize)dataGridView1).BeginInit();
            tableLayoutPanel1.SuspendLayout();
            tableLayoutPanel2.SuspendLayout();
            SuspendLayout();
            //
            // 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, 376);
            dataGridView1.TabIndex = 0;
            //
            // tableLayoutPanel1
            //
            tableLayoutPanel1.ColumnCount = 1;
            tableLayoutPanel1.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            tableLayoutPanel1.Controls.Add(dataGridView1, 0, 0);
            tableLayoutPanel1.Controls.Add(tableLayoutPanel2, 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, 84.8888855F));
            tableLayoutPanel1.RowStyles.Add(new RowStyle(SizeType.Percent, 15.1111107F));
            tableLayoutPanel1.Size = new Size(800, 450);
            tableLayoutPanel1.TabIndex = 1;
            //
            // tableLayoutPanel2
            //
            tableLayoutPanel2.ColumnCount = 2;
            tableLayoutPanel2.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            tableLayoutPanel2.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            tableLayoutPanel2.Controls.Add(btnAddOk, 0, 0);
            tableLayoutPanel2.Controls.Add(btnAddNg, 1, 0);
            tableLayoutPanel2.Dock = DockStyle.Fill;
            tableLayoutPanel2.Location = new Point(3, 385);
            tableLayoutPanel2.Name = "tableLayoutPanel2";
            tableLayoutPanel2.RowCount = 1;
            tableLayoutPanel2.RowStyles.Add(new RowStyle(SizeType.Percent, 50F));
            tableLayoutPanel2.Size = new Size(794, 62);
            tableLayoutPanel2.TabIndex = 1;
            //
            // btnAddOk
            //
            btnAddOk.Dock = DockStyle.Fill;
            btnAddOk.Location = new Point(3, 3);
            btnAddOk.Name = "btnAddOk";
            btnAddOk.Size = new Size(391, 56);
            btnAddOk.TabIndex = 0;
            btnAddOk.Text = "データソースに行を追加";
            btnAddOk.UseVisualStyleBackColor = true;
            btnAddOk.Click += btnAddOk_Click;
            //
            // btnAddNg
            //
            btnAddNg.Dock = DockStyle.Fill;
            btnAddNg.Location = new Point(400, 3);
            btnAddNg.Name = "btnAddNg";
            btnAddNg.Size = new Size(391, 56);
            btnAddNg.TabIndex = 1;
            btnAddNg.Text = "直接行を追加 (エラー)";
            btnAddNg.UseVisualStyleBackColor = true;
            btnAddNg.Click += btnAddNg_Click;
            //
            // 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);
            ResumeLayout(false);
        }

        #endregion

        private DataGridView dataGridView1;
        private TableLayoutPanel tableLayoutPanel1;
        private TableLayoutPanel tableLayoutPanel2;
        private Button btnAddOk;
        private Button btnAddNg;
    }
}

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namespace WaterMargin.WinForms.DgvRowAdd
{
    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());
        }
    }
}

<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>

<?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>