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asp.net GridView¿Ø¼þÖÐÄ£°åÁÐCheckBoxÈ«Ñ¡¡¢·´Ñ¡¡¢È¡Ïû

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
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;

public partial class Demo18 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack==false)
{
BindData();
}
}

public void BindData()
{
string strSql="select UserID,C_Name,E_Name,UpdataDate,isDY from Demo_User ";
DataTable dt=SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING, CommandType.Text, strSql, null).Tables[0];

GridView.DataSource=dt;
GridView.DataKeyNames=new string[] { "UserID" };//Ö÷¼ü
GridView.DataBind();
}

protected void GridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView.PageIndex=e.NewPageIndex;
BindData();
}

protected void Button1_Click(object sender, EventArgs e)
{
CheckBoxAll.Checked=false;
CheckBox1.Checked=false;
for (int i=0; i <=GridView.Rows.Count - 1; i++)
{
CheckBox CheckBox=(CheckBox)GridView.Rows[i].FindControl("CheckBox");
CheckBox.Checked=false;
}

}

protected void Button2_Click(object sender, EventArgs e)
{
for (int i=0; i <=GridView.Rows.Count - 1; i++)
{
CheckBox CheckBox=(CheckBox)GridView.Rows[i].FindControl("CheckBox");
if (CheckBox.Checked==true)
{
string strSql="Update Demo_User set UpdataDate=@UpdataDate where UserID=@UserID ";
SqlParameter[] para={
new SqlParameter("@UpdataDate", DateTime.Now),
new SqlParameter("@UserID", GridView.DataKeys[i].Value),
};
SqlHelper.ExecuteNonQuery(SqlHelper.CONN_STRING, CommandType.Text, strSql, para);
}
}
CheckBoxAll.Checked=false;
CheckBox1.Checked=false;
BindData();

}

protected void CheckBoxAll_CheckedChanged(object sender, EventArgs e)
{
for (int i=0; i <=GridView.Rows.Count - 1; i++)
{
CheckBox CheckBox=(CheckBox)GridView.Rows[i].FindControl("CheckBox");
if (CheckBoxAll.Checked==true)
{
CheckBox.Checked=true;
}
else
{
CheckBox.Checked=false;
}
}
CheckBox1.Checked=false;

}

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)
{
for (int i=0; i <=GridView.Rows.Count - 1; i++)
{
CheckBox CheckBox=(CheckBox)GridView.Rows[i].FindControl("CheckBox");
if (CheckBox.Checked==false)
{
CheckBox.Checked=true;
}
else
{
CheckBox.Checked=false;
}
}
CheckBoxAll.Checked=false;
}
}

<table align="center" bgcolor="#c0de98" border="0" cellpadding="0" cellspacing="1" width="99%">
<tr>
<th colspan="2">
GridViewÑÝʾ</th>
</tr>
<tr>
<td colspan="2" style="width: 100%;" >
<asp:GridView ID="GridView" runat="server" Width="100%" AutoGenerateColumns="False" AllowPaging="True" OnPageIndexChanging="GridView_PageIndexChanging" PageSize="12" >
<Columns>
<asp:TemplateField HeaderText="Ñ¡Ôñ">
<ItemTemplate>
<asp:CheckBox ID="CheckBox" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="UserID" HeaderText="UserID" ReadOnly="True" />
<asp:BoundField DataField="C_Name" HeaderText="ÖÐÎÄÃû×Ö" ReadOnly="True" />
<asp:BoundField DataField="E_Name" HeaderText="Ó¢ÎÄÃû×Ö" ReadOnly="True" />
<asp:BoundField DataField="UpdataDate" HeaderText="¸üÐÂʱ¼ä" />
</Columns>
<RowStyle HorizontalAlign="Center" />
<PagerStyle HorizontalAlign="Right" />
</asp:GridView>
</td>
</tr>

<tr>
<td >
<asp:CheckBox ID="CheckBoxAll" runat="server" Text="È«Ñ¡" Width="80px" AutoPostBack="True" OnCheckedChanged="CheckBoxAll_CheckedChanged" />
<asp:CheckBox ID="CheckBox1" runat="server" Text="·´Ñ¡" Width="80px" AutoPostBack="True" OnCheckedChanged="CheckBox1_CheckedChanged" />
<asp:Button ID="Button1" runat="server" Text="È¡¡¡Ïû" CssClass="Button" OnClick="Button1_Click"/>
<asp:Button ID="Button2" runat="server" Text="¸üÐÂʱ¼ä" CssClass="Button" OnClick="Button2_Click"/></td>
</tr>
</table>

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