.net 2005下的Windows Form Application,一個DataGridView控件和4個Button，界面設置如下：

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代碼如下，有注解，相信大家都看得明白：

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

namespace Wind
{
??? public partial class Form1 : Form
??? {

??????? int c = 1;

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

??????? //全選或取消全選
??????? private void btn_SelectAll(object sender, EventArgs e)
??????? {
??????????? int selectedRows = dgv.SelectedRows.Count;
??????????? if (selectedRows == dgv.Rows.Count)
??????????? {
??????????????? foreach (DataGridViewRow dr in dgv.SelectedRows)
??????????????? {
??????????????????? dr.Selected = false;
??????????????? }
??????????? }
??????????? else
??????????????? dgv.SelectAll();
??????? }

??????? //清空所有記錄
??????? private void btn_Clear(object sender, EventArgs e)
??????? {
??????????? dgv.Rows.Clear();
??????? }

??????? //刪除所有選中的行
??????? private void btn_deleteSelectedRows(object sender, EventArgs e)
??????? {
??????????? foreach (DataGridViewRow dr in dgv.SelectedRows)
??????????? {
??????????????? if(dr.IsNewRow == false)//如果不是已提交的行，默認情況下在添加一行數據成功后，DataGridView為新建一行作為新數據的插入位置
??????????????????? dgv.Rows.Remove(dr);
??????????? }
??????? }

??????? //添加一行新記錄
??????? private void btn_addOneRecord_Click(object sender, EventArgs e)
??????? {
??????????? DataGridViewRow dr = new DataGridViewRow();
??????????? dr.CreateCells(dgv);
??????????? dr.Cells[0].Value = "h" + c.ToString();
??????????? dr.Cells[1].Value = (c++);
??????????? dgv.Rows.Insert(0, dr);???????????????????? //添加的行作為第一行
??????????? //dgv.Rows.Add(dr);???????????????????????? //添加的行作為最后一行
??????? }
??? }
}

總結

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