DataGrid和DropDownList的一些配合以及使用css定制DataGrid
DataGrid和DropDownList的一些配合以及使用css定制DataGrid
有的时候我们需要
（1）在编辑的时候用下拉框选择，并且默认为数据库的内容
（2）使用下拉框过滤数据
（3）使用css统一定制DataGrid
下面给出代码：
数据结构：
表dep：depid（标识主键），depname（学院名字）
表stu：stuid（标识主键），stuname（学生名字），studepid（学院id＝表dep.depid）
前台：
<%@ Page language='c#' Codebehind='WebForm28.aspx.cs' AutoEventWireup='false' Inherits='csdn.WebForm28' %>
<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.0 Transitional//EN' >
<HTML>
<HEAD>
<title>WebForm28</title>
<meta name='GENERATOR' Content='Microsoft Visual Studio .NET 7.1'>
<meta name='CODE_LANGUAGE' Content='C#'>
<meta name='vs_defaultClientScript' content='JavaScript'>
<link href='css.css' rel='stylesheet' type='text/css'>
<meta name='vs_targetSchema' content='http://schemas.microsoft.com/intellisense/ie5'>
</HEAD>
<body>
<form id='Form1' method='post' runat='server'>
<asp:DropDownList id='DropDownList1' runat='server' AutoPostBack='True'></asp:DropDownList>
<asp:DataGrid id='DataGrid1' runat='server' AutoGenerateColumns='False' CellSpacing='1' BorderWidth='0px'
CellPadding='5' CssOnEditCommand='edit' OnCancelCommand='cancel' OnUpdateCommand='update'
DataKeyField='stuid'>
<ItemStyle CssCssHeaderText='姓名'>
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem,'stuname') %>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id='name' Runat='server' Text='<%# DataBinder.Eval(Container.DataItem,'stuname') %>' Width='88px'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText='学院'>
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem,'depname') %>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList ID='dep' Runat='server'></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:EditCommandColumn ButtonType='PushButton' UpdateText='更新' CancelText='取消' EditText='编辑'></asp:EditCommandColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</HTML>
后台：
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls; namespace csdn
{
/// <summary>
/// WebForm28 的摘要说明。
/// </summary>
public class WebForm28 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
{
SetBind();
SetBind2();
}
}
protected void SetBind()
{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings['conn']);
SqlDataAdapter da=new SqlDataAdapter('select * from stu,dep where stu.studepid=dep.depid',conn);
DataSet ds=new DataSet();
da.Fill(ds,'table1');
this.DataGrid1.DataSource=ds.Tables['table1'];
this.DataGrid1.DataBind();
}
protected void SetBind2()
{
SqlConnection conn2=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings['conn']);
SqlDataAdapter da2=new SqlDataAdapter('select * from dep',conn2);
DataSet ds2=new DataSet();
da2.Fill(ds2,'table1');
this.DropDownList1.DataSource=ds2.Tables['table1'];
this.DropDownList1.DataTextField='depname';
this.DropDownList1.DataValueField='depid';
this.DropDownList1.DataBind();
this.DropDownList1.Items.Insert(0,new ListItem('请选择',''));
}
protected void SetBind3()
{
string s=this.DropDownList1.SelectedValue;
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings['conn']);
SqlCommand comm=new SqlCommand();
comm.Connection=conn;
if(s!='')
{
comm.CommandText='select * from stu,dep where stu.studepid=dep.depid and depid=@depid';
SqlParameter parm1=new SqlParameter('@depid',SqlDbType.Int);
parm1.Value=s;
comm.Parameters.Add(parm1);
}
else
comm.CommandText='select * from stu,dep where stu.studepid=dep.depid';
SqlDataAdapter da=new SqlDataAdapter();
da.SelectCommand=comm;
DataSet ds=new DataSet();
da.Fill(ds,'table1');
this.DataGrid1.DataSource=ds.Tables['table1'];
this.DataGrid1.DataBind();
}
#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.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.DropDownList1.SelectedIndexChanged += new System.EventHandler(this.DropDownList1_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings['conn']);
SqlDataAdapter da=new SqlDataAdapter('select * from dep',conn);
DataSet ds=new DataSet();
da.Fill(ds,'table1');
if(e.Item.ItemType==ListItemType.EditItem)
{
DropDownList ddl=(DropDownList)e.Item.FindControl('dep');
ddl.DataSource=ds.Tables['table1'];
ddl.DataTextField='depname';
ddl.DataValueField='depid';
ddl.DataBind();
ddl.Items.FindByValue(Convert.ToString(DataBinder.Eval(e.Item.DataItem,'depid'))).Selected=true;//选择数据库内的作为默认
}
}
protected void edit(object sender,DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex=e.Item.ItemIndex;
if(this.DropDownList1.SelectedValue=='')
SetBind();
else
SetBind3();
}
protected void cancel(object sender,DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex=-1;
if(this.DropDownList1.SelectedValue=='')
SetBind();
else
SetBind3();
}
protected void update(object sender,DataGridCommandEventArgs e)
{
if(e.Item.ItemType==ListItemType.EditItem)//只有在编辑按下以后才能提交
{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings['conn']);
SqlCommand comm=new SqlCommand('update stu set stuname=@name,studepid=@depid where stuid=@id',conn);
SqlParameter parm1=new SqlParameter('@name',SqlDbType.NVarChar,50);
parm1.Value=((TextBox)e.Item.FindControl('name')).Text;
SqlParameter parm2=new SqlParameter('@depid',SqlDbType.Int);
parm2.Value=((DropDownList)e.Item.FindControl('dep')).SelectedValue;
SqlParameter parm3=new SqlParameter('@id',SqlDbType.Int);
parm3.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex];
comm.Parameters.Add(parm1);
comm.Parameters.Add(parm2);
comm.Parameters.Add(parm3);
conn.Open();
comm.ExecuteNonQuery();
conn.Close();
this.DataGrid1.EditItemIndex=-1;
if(this.DropDownList1.SelectedValue=='')
SetBind();
else
SetBind3();//如果选择过滤则使用SetBind3()
}
}
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
SetBind3();
}
}
}
css：
.border {
background-color: #00496C;
}
.header {
font-family: '宋体', sans-serif;
font-size: 10pt;
font-weight: bold;
color: #FFFFFF;
background-color: #0080C0;
text-align: center;
}
.item {
font-family: '宋体', sans-serif;
font-size: 9pt;
font-weight: normal;
color: #0080C0;
background-color: #FFFFFF;
text-align: center;
}
代码比较简单，下面简单说明一下：
（1）SetBind()是基本的绑定;SetBind2()是绑定外面的那个DropDownList;SetBind3()是在下拉框选择了以后过滤后的DataGrid的绑定
（2）这里使用Css来实现表格边框是利用CellSpacing，所以这个数值就是边框的宽度，在表格边框的css中使用background-color来描述边框的颜色。
转：http://lovecherry.cnblogs.com/archive/2005/12/13/125525.html#295905
