【转】教你用C#读写、删除、更新excel表格记录

文章出处：http://blog.csdn.net/kuangshazi515/article/details/6585118

如下图所示，编一个程序，鼠标单击窗体视图区（右边）时，获取一对坐标（X,Y)，点击保存将点保存到excel表记录中。此外，还实现了删除、更新功能以及打开excel表功能。插入和更新比较简单，和操作一般的数据库一样，但是删除稍微有点复杂，不能用delete from [Sheet1$] where ID=x的方式删除，自己可以去试，主要是excel数据之间的关系不像关系数据库那么简单，oledb不提供这种方法。所以只能用专门操作excel表的（Microsoft.Office.Interop.Excel名字空间下，先添加引用)来实现删除某条记录的功能。

源代码：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Data.OleDb;

using System.Reflection;

using Excel = Microsoft.Office.Interop.Excel;

namespace Leation

{

public partial class FrmMain : Form

{

//定义变量

private OleDbConnection connection = null;

private OleDbCommand cmd = null;

private OleDbDataAdapter dataAdapter = null;

private DataSet dataSet = null;

private string filePath = @"G:\points.xls";

private string connStr = "provider=microsoft.jet.oledb.4.0;data source=G:\\points.xls;extended properties='Excel 8.0;HDR=yes;IMEX=2'";

private string selectStr = "select * from [Sheet1$]";

private string cmdStr = null;

private string OID = null;    //对象ID

private string x = null;

private string y = null;

private Excel.Application excelApp = null;

private Excel.Workbook book = null;

private Excel.Worksheet sheet = null;

private Excel.Range range = null;

//构造函数

public FrmMain()

{

InitializeComponent();

}

//鼠标移动事件

private void splitContainer1_Panel2_MouseMove(object sender, MouseEventArgs e)

{

this.lblxy.Text = "x=" + e.X.ToString() + "  y=" + e.Y.ToString();

}

//鼠标按下事件

private void splitContainer1_Panel2_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

this.tbX.Text = e.X.ToString();

this.tbY.Text = e.Y.ToString();

}

}

//刷新dataGridView1

private void RefreshTable()

{

connection = new OleDbConnection(connStr);

connection.Open();

dataAdapter = new OleDbDataAdapter(selectStr, connection);

dataSet = new DataSet();

dataAdapter.Fill(dataSet);

this.dataGridView1.DataSource = dataSet.Tables[0];

connection.Close();

}

//程序加载事件，初始化dataGridView1

private void FrmMain_Load(object sender, EventArgs e)

{

this.RefreshTable();

}

//获取一个可以用的OID

private string GetOID()

{

int rowNum = this.dataGridView1.Rows.Count - 1;

int maxOID = 0;

int temp = 0;

for (int i = 0; i < rowNum; i++)

{

temp = int.Parse(this.dataGridView1[0, i].Value.ToString());

if (maxOID < temp)

{

maxOID = temp;

}

}

return (maxOID+1).ToString();

}

//插入一条记录，即保存一个点信息

private void btnSavePnt_Click(object sender, EventArgs e)

{

OID = this.GetOID();

x = this.tbX.Text;

y = this.tbY.Text;

if (x == "" || y == "")

{

MessageBox.Show("x,y不能为空");

lblTip.Text = "保存失败";

return;

}

connection = new OleDbConnection(connStr);

connection.Open();

cmdStr = "insert into [Sheet1$](ID,X,Y) values(" + OID + "," + x + "," + y + ")";

cmd = new OleDbCommand(cmdStr, connection);

int row=cmd.ExecuteNonQuery();

if (row > 0)

{

lblTip.Text = "保存成功，插入行数：" + row.ToString();

}

else

{

lblTip.Text = "保存失败";

}

connection.Close();

this.RefreshTable();

}

//删除记录

private void btnDelSelRow_Click(object sender, EventArgs e)

{

int selRowIndex = this.dataGridView1.CurrentRow.Index + 2;   //excel表中的行索引与dataGridView不一样，这里注意

if (selRowIndex<1)

{

MessageBox.Show("没有选中行");

lblTip.Text = "删除失败";

return;

}

excelApp = new Microsoft.Office.Interop.Excel.Application();

excelApp.Visible = false;   //若为true，删除瞬间可以看见 office excel界面

//打开excel文件

book = excelApp.Workbooks.Open(filePath, Missing.Value,false, Missing.Value, Missing.Value, Missing.Value, true, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

//获取sheet1

sheet = (Excel.Worksheet)book.Worksheets[1];

//获取编辑范围

range = (Excel.Range)sheet.Rows[selRowIndex, Missing.Value];

//删除整行

range.EntireRow.Delete(Excel.XlDeleteShiftDirection.xlShiftUp);

//保存编辑

book.Save();

//关闭book

book.Close(Missing.Value, Missing.Value, Missing.Value);

//退出excel application，可以将前面的excelApp.Visible = false改为excelApp.Visible = true看看;

excelApp.Workbooks.Close();

excelApp.Quit();

//刷新dataGridView1

this.RefreshTable();

//选中删除行的上一行

if ((selRowIndex - 3) > 0)

{

this.dataGridView1.Rows[selRowIndex - 3].Selected = true;

}

this.lblTip.Text="删除成功";

}

//更新记录

private void btnUpdate_Click(object sender, EventArgs e)

{

int selRowIndex= this.dataGridView1.CurrentRow.Index;

if (selRowIndex< 0)

{

MessageBox.Show("没有选中行!");

lblTip.Text = "更新失败";

return;

}

OID = this.dataGridView1[0, selRowIndex].Value.ToString();

x = this.tbX.Text;

y = this.tbY.Text;

if (x == "" || y == "")

{

MessageBox.Show("x,y不能为空");

lblTip.Text = "更新失败";

return;

}

connection = new OleDbConnection(connStr);

connection.Open();

cmdStr = "update [Sheet1$] set X="+x+",Y="+y+" where ID='"+OID+"'";

cmd = new OleDbCommand(cmdStr, connection);

int row = cmd.ExecuteNonQuery();

if (row >= 1)

{

lblTip.Text = "更新成功，更新行数：" + row.ToString();

}

else

{

lblTip.Text = "更新失败";

}

connection.Close();

this.RefreshTable();

//选中更新的行

this.dataGridView1.Rows[selRowIndex].Selected = true;

}

private void btnOpenFile_Click(object sender, EventArgs e)

{

OpenFileDialog ofd = new OpenFileDialog();

ofd.Filter = "excel文件(*.xls)|*.xls";

ofd.Title = "代开excel表";

if (ofd.ShowDialog() == DialogResult.OK)

{

this.filePath = ofd.FileName;

this.connStr = "provider=microsoft.jet.oledb.4.0;data source=" + filePath + ";extended properties='Excel 8.0;HDR=yes;IMEX=2'";

this.RefreshTable();

}

}

}

}