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在GridView中绑定下拉列表（查询和编辑）

2010-06-03 09:40 399 查看

问题：用GridView显示学生信息，学生所在学院用下拉列表显示，编辑时可对所在学院进行编辑。

（概括：在GridView中嵌入下拉列表，查询状态时下拉列表显示对应的列表项，编辑时可重新选择列表项，更新后列表项相应改变。）

如下图所示

图一查询状态

图二编辑状态

Student表

学院表

前台代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>学生信息</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Width="50%"
onrowcancelingedit="GridView1_RowCancelingEdit"
onrowdatabound="GridView1_RowDataBound" onrowediting="GridView1_RowEditing"
onrowupdating="GridView1_RowUpdating" DataKeyNames="stuID">
<Columns>
<asp:BoundField DataField="stuName" HeaderText="姓名" ReadOnly="true" />
<asp:TemplateField HeaderText="学院">
<ItemTemplate>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="True" />
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>

后台代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Grid_Drop : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGridView1();
}
}

//DataOperate为数据库操作函数
DataOperate sqlHelper = new DataOperate();

/// <summary>
/// 绑定GridView1
/// </summary>
protected void BindGridView1()
{
string sql = "select * from student";
DataSet ds = sqlHelper.GetDataSet(sql);
GridView1.DataSource = ds;
GridView1.DataBind();
for (int i = 0; i < GridView1.Rows.Count; i++)
{
string sqlCollege = "select cID from Student where cID=" + GridView1.DataKeys[i].ToString();
string cid = ds.Tables[0].Rows[i]["cid"].ToString();
((DropDownList)GridView1.Rows[i].Cells[1].FindControl("DropDownList1")).SelectedValue = cid;
}
}

protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
BindGridView1();
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if ((DropDownList)e.Row.FindControl("DropDownList1")!=null)
{
DropDownList ddlCollege = (DropDownList)e.Row.FindControl("DropDownList1");
string sql = "select * from College";
DataSet ds = sqlHelper.GetDataSet(sql);
ddlCollege.DataSource = ds;
ddlCollege.DataTextField = "cName";
ddlCollege.DataValueField = "cID";
ddlCollege.DataBind();
}
}

protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
BindGridView1();
}

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
string cid=((DropDownList)GridView1.Rows[e.RowIndex].FindControl("DropDownList1")).SelectedValue.ToString();
string stuID = GridView1.DataKeys[e.RowIndex].Value.ToString();
string cmdText = "Update student set cid=" + cid + " where stuID=" + stuID;
sqlHelper.ExecCmd(cmdText);
GridView1.EditIndex = -1;
BindGridView1();
}

}

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