C#dataGridView 批量修改数据

 Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Add_Button_Click_1(object sender, EventArgs e)
        {
            int index = this.dataGridView1.Rows.Add();
            this.dataGridView1.Rows[index].Cells[0].Value = index;
            this.dataGridView1.Rows[index].Cells[1].Value = "ababc";
            this.dataGridView1.Rows[index].Cells[2].Value = "ABCBC";
        }

        private void Query_Button_Click_1(object sender, EventArgs e)
        {
            Console.WriteLine("Query");
            Console.WriteLine("取得当前单元格内容" + dataGridView1.CurrentCell.Value);
            Console.WriteLine("取得当前单元格的列数" + dataGridView1.CurrentCell.ColumnIndex);
            Console.WriteLine("取得当前单元格的行数" + dataGridView1.CurrentCell.RowIndex);
        }

        private void AddM_Button_Click_1(object sender, EventArgs e)
        {
            DataGridViewRow row = new DataGridViewRow();
            DataGridViewTextBoxCell textboxcell = new DataGridViewTextBoxCell();
            textboxcell.Value = "aaa";
            row.Cells.Add(textboxcell);
            DataGridViewComboBoxCell comboxcell = new DataGridViewComboBoxCell();
            string[] jgStr = new string[] { "砖混", "框混", "全框架", "其它" };
            comboxcell.DataSource = jgStr;
            comboxcell.Value = "框混";
            row.Cells.Add(comboxcell);
            dataGridView1.Rows.Add(row);

            // 固定第一行
            dataGridView1.Rows[0].Frozen = true;
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            int c = dataGridView1.SelectedCells.Count;
            for (int i = 0; i < c; i++)
            {
                dataGridView1.SelectedCells[i].Value = textBox1.Text;
            }
        }
 
    }
}