添加、删除更新、编辑全部代码（附件中带源程序）
王杰小提示：一定要在datagrid的datakeyfiled中指定id，大小写不区分，否则会出错的！
此程序是datagrid控件动态添加、修改数据的代表，作为ado.net综合应用，将实现在不刷新页面的情况下的添加、修改数据，也就是它的优点！
下面是全部代码！
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
namespace WebApplication12
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.Label Label3;
protected System.Web.UI.WebControls.Label Label4;
protected System.Web.UI.WebControls.Label Label5;
protected System.Web.UI.WebControls.Label Label6;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.TextBox TextBox3;
protected System.Web.UI.WebControls.TextBox TextBox4;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;
private void Page_Load(object sender, System.EventArgs e)
{
if (!IsPostBack) ReadRecords();
}
private void ReadRecords()
{
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString="provider=microsoft.jet.oledb.4.0;data source="+Server.MapPath("db1.mdb");
string cmd="select * from table1";
conn.Open();
OleDbCommand comm=new OleDbCommand(cmd,conn);
OleDbDataReader reader=comm.ExecuteReader();
DataGrid1.DataSource=reader;
DataGrid1.DataBind();
conn.Close();
}
#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelCommand);
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateCommand);
this.DataGrid1.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_DeleteCommand);
this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
DataGrid1.EditItemIndex=-1;
ReadRecords();
}
private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
DataGrid1.EditItemIndex=e.Item.ItemIndex;
ReadRecords();
}
private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string sql="update table1 set 姓名='"+((TextBox)e.Item.Cells[2].Controls[0]).Text+"',语文="+((TextBox)e.Item.Cells[3].Controls[0]).Text+",数学="+((TextBox)e.Item.Cells[4].Controls[0]).Text+",英语="+((TextBox)e.Item.Cells[5].Controls[0]).Text+" where id="+DataGrid1.DataKeys[(int)e.Item.ItemIndex]+"";
ExecuteNonQuery(sql);
DataGrid1.EditItemIndex=-1;
ReadRecords();
}
private void ExecuteNonQuery(string sql)
{
OleDbConnection conn=new OleDbConnection();
try
{
conn.ConnectionString="provider=microsoft.jet.oledb.4.0;data source="+Server.MapPath("db1.mdb");
conn.Open();
OleDbCommand cmd=new OleDbCommand(sql,conn);
cmd.ExecuteNonQuery();
}
catch (Exception e)
{
Response.Write(e.Message);
Response.End();
}
finally
{
if (conn !=null) conn.Close();
}
}
private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
{
}
private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString="provider=microsoft.jet.oledb.4.0;data source="+Server.MapPath("db1.mdb");
string sql="delete from table1 where id="+DataGrid1.DataKeys[(int)e.Item.ItemIndex];
OleDbCommand comm=new OleDbCommand(sql,conn);
conn.Open();
try
{
comm.ExecuteNonQuery();
Label1.Text="<b>删除成功</b>";
}
catch (OleDbException)
{
Label1.Text="<b>删除失败！</b>";
Label1.Style["color"]="red";
}
conn.Close();
ReadRecords();
}
private void Button1_Click(object sender, System.EventArgs e)
{
OleDbConnection conn=new OleDbConnection();
conn.ConnectionString="provider=microsoft.jet.oledb.4.0;data source="+Server.MapPath("db1.mdb");
string sql="insert into table1(姓名,语文,数学,英语) values('"+TextBox1.Text+"',"+TextBox2.Text+","+TextBox3.Text+","+TextBox4.Text+")";
OleDbCommand cmd=new OleDbCommand(sql,conn);
conn.Open();
try
{
cmd.ExecuteNonQuery();
Label1.Text="添加成功！";
}
catch(OleDbException)
{
Label1.Text="添加失败！";
Label1.Style["color"]="red";
}
conn.Close();
ReadRecords();
}
}
}
[此贴子已经被作者于2005-12-1 17:07:41编辑过]
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