本文介绍如何使用ASP.NET中的DataGrid控件实现复选框功能，包括数据绑定、全选/全不选操作及获取选中项的具体实现。
<HTML> <HEAD> <title>DataGridCheckBox</title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="C#" name="CODE_LANGUAGE"> <meta content="JavaScript" name="vs_defaultClientScript"> <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <FONT face="宋体"> <TABLE id="Table1" cellSpacing="1" cellPadding="1" width="300" border="0"> <TR> <TD><asp:datagrid id="dgCheckBox" runat="server" GridLines="Vertical" CellPadding="3" BackColor="White" BorderWidth="1px" BorderStyle="None" BorderColor="#999999" AutoGenerateColumns="False"> <SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#008A8C"></SelectedItemStyle> <AlternatingItemStyle BackColor="#DCDCDC"></AlternatingItemStyle> <ItemStyle ForeColor="Black" BackColor="#EEEEEE"></ItemStyle> <HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#000084"></HeaderStyle> <FooterStyle ForeColor="Black" BackColor="#CCCCCC"></FooterStyle> <Columns> <asp:TemplateColumn> <ItemTemplate> <asp:CheckBox id="chkExport" runat="server"></asp:CheckBox> </ItemTemplate> <EditItemTemplate> <asp:CheckBox id="chkExportON" runat="server"></asp:CheckBox> </EditItemTemplate> </asp:TemplateColumn> <asp:BoundColumn DataField="LastName" HeaderText="LastName"></asp:BoundColumn> <asp:BoundColumn DataField="FirstName" HeaderText="FirstName"></asp:BoundColumn> <asp:TemplateColumn HeaderText="City"> <ItemTemplate> <asp:Label id=lblColumn runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.City") %>'> </asp:Label> </ItemTemplate> </asp:TemplateColumn> </Columns> <PagerStyle HorizontalAlign="Center" ForeColor="Black" BackColor="#999999" Mode="NumericPages"></PagerStyle> </asp:datagrid></TD> </TR> <TR> <TD><asp:button id="cmdSelectAll" runat="server" Text="全选"></asp:button><asp:button id="cmdFindSelected" runat="server" Text="取得选择的项"></asp:button></TD> </TR> <TR> <TD><asp:label id="Message" runat="server">Label</asp:label></TD> </TR> </TABLE> </FONT> </form> </body></HTML> private void DataGridDataBind()
{
//定义数据连接对象,其中数据库连接字符串是在Web.Config文件中定义的 SqlConnection conn = new SqlConnection("Server=soft5;User id=sa;Pwd=;Database=Northwind"); //创建数据适配器对象 SqlDataAdapter da = new SqlDataAdapter("select top 5 LastName,FirstName,City from Employees",conn); //创建DataSet对象 DataSet ds = new DataSet(); try
{ //填充数据集 da.Fill(ds,"testTable"); //进行数据绑定 dgCheckBox.DataSource = ds.Tables["testTable"]; dgCheckBox.DataBind();
} catch(Exception error) { //输出异常信息 Response.Write(error.ToString()); } 
} private void cmdSelectAll_Click(object sender, System.EventArgs e) { System.Web.UI.WebControls.CheckBox chkExport; //如果要全选 if(cmdSelectAll.Text == "全选") { //循环设置DataGrid控件中的项 foreach(DataGridItem oDataGridItem in dgCheckBox.Items) { //建立模板列中CheckBox控件的引用 chkExport = (CheckBox)oDataGridItem.FindControl("chkExport"); //选中 chkExport.Checked =true; } cmdSelectAll.Text = "全消"; } else { foreach(DataGridItem oDataGridItem in dgCheckBox.Items) { //建立模板列中CheckBox控件的引用 chkExport = (CheckBox)oDataGridItem.FindControl("chkExport"); //取消 chkExport.Checked = false; } cmdSelectAll.Text = "全选"; } } private void cmdFindSelected_Click(object sender, System.EventArgs e) { System.Web.UI.WebControls.CheckBox chkExport; String sID; System.Text.StringBuilder strMsg = new System.Text.StringBuilder("选中项的City字段值分别为：<hr color=red>"); //循环取的DataGrid控件中选定项的值 foreach(DataGridItem oDataGridItem in dgCheckBox.Items) { chkExport = (CheckBox)oDataGridItem.FindControl("chkExport"); //如果选中了则取值 if(chkExport.Checked) { sID = ((Label)(oDataGridItem.FindControl("lblColumn"))).Text; strMsg.Append(sID+"<br><hr color=red>"); } } //显示选中项的值 Message.Text = strMsg.ToString(); }
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