asp.net下gridview 批量删除的实现方法
要实现的效果很简单，看下图片：
功能：选中CheckBox，后从数据库中删除选中项。文章侧重将如何实现批量删除，对于如何链接数据库和绑定数据不做详细解释。
1 我们先要在GridView中添加一列为CheckBox。代码如下：
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="vote_id" HeaderText="编号" />
<asp:BoundField DataField="vote_name" HeaderText="名称" />
<asp:TemplateField HeaderText="选择">
<ItemTemplate>
<asp:CheckBox id="cbxId" runat="Server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
注意id为cbxId，呆会我们要用到。
2 绑定数据。
//初始化数据
private void dataInit()
{
string sqlText = "select * from vote";
SqlConnection conn = getCon();
SqlDataAdapter da = new SqlDataAdapter(sqlText,conn);
DataSet ds = new DataSet();
conn.Open();
da.Fill(ds, "vote");
GridView1.DataSource = ds;
GridView1.DataKeyNames = new string[]{"vote_id"};
GridView1.DataBind();
conn.Close();
conn.Dispose();
}
3 点击“删除选中”按钮的事件。
protected void Button1_Click(object sender, EventArgs e)
{
string sqlText = "(";
for (int i = 0; i < GridView1.Rows.Count; i++)
{
//搜索第n行3列
CheckBox cbx = (CheckBox)GridView1.Rows[i].FindControl("cbxId");
if (cbx.Checked == true)
{
sqlText = sqlText + Convert.ToInt32(GridView1.DataKeys[i].Value) + ",";
}
}
//去掉最后的逗号，并且加上右括号
sqlText = sqlText.Substring(0,sqlText.Length - 1) + ")";
sqlText = "delete vote where vote_id in" + sqlText;
try
{
//执行删除语句
SqlConnection conn = getCon();
conn.Open();
SqlCommand cmd = new SqlCommand(sqlText,conn);
int delCount = Convert.ToInt32(cmd.ExecuteNonQuery());
Response.Write("<script>alert('共删除" + delCount + "条数据');</script>");
dataInit();
}
catch(Exception ex)
{
//若有错误发生，输出错误信息
Response.Write(ex.Message);
}
}
所以对于选中后，我们只需要取得(1,3,5,6)这样的语句就可以了。看上面代码，我稍微做了下注释。
完整的代码：
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>gridview 批量删除</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="vote_id" HeaderText="编号" />
<asp:BoundField DataField="vote_name" HeaderText="名称" />
<asp:TemplateField HeaderText="选择">
<ItemTemplate>
<asp:CheckBox id="cbxId" runat="Server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" Text="删除选中" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
//引入命名空间
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//判断回发是否要执行
if (!IsPostBack)
{
dataInit();
}
}
//返回一个连接对象
private SqlConnection getCon()
{
return new SqlConnection(ConfigurationManager.ConnectionStrings["voteConnectionString"].ToString());
}
//初始化数据
private void dataInit()
{
string sqlText = "select * from vote";
SqlConnection conn = getCon();
SqlDataAdapter da = new SqlDataAdapter(sqlText,conn);
DataSet ds = new DataSet();
conn.Open();
da.Fill(ds, "vote");
GridView1.DataSource = ds;
GridView1.DataKeyNames = new string[]{"vote_id"};
GridView1.DataBind();
conn.Close();
conn.Dispose();
}
protected void Button1_Click(object sender, EventArgs e)
{
string sqlText = "(";
for (int i = 0; i < GridView1.Rows.Count; i++)
{
//搜索第n行3列
CheckBox cbx = (CheckBox)GridView1.Rows[i].FindControl("cbxId");
if (cbx.Checked == true)
{
sqlText = sqlText + Convert.ToInt32(GridView1.DataKeys[i].Value) + ",";
}
}
//去掉最后的逗号，并且加上右括号
sqlText = sqlText.Substring(0,sqlText.Length - 1) + ")";
sqlText = "delete vote where vote_id in" + sqlText;
try
{
//执行删除语句
SqlConnection conn = getCon();
conn.Open();
SqlCommand cmd = new SqlCommand(sqlText,conn);
int delCount = Convert.ToInt32(cmd.ExecuteNonQuery());
Response.Write("<script>alert('共删除" + delCount + "条数据');</script>");
dataInit();
}
catch(Exception ex)
{
//若有错误发生，输出错误信息
Response.Write(ex.Message);
}
}
}