(原創)DataGrid和DropDownList的一些配合以及使用css定製DataGrid

最後更新：2018-12-07 來源：互聯網

上載者：User

創建阿里雲帳戶，並獲得超過 40 款產品的免費試用版；而企業帳戶則可以享有總值 $1200 的免費試用版。立即註冊！

有的時候我們需要
（1）在編輯的時候用下拉框選擇，並且預設為資料庫的內容
（2）使用下拉框過濾資料
（3）使用css統一定製DataGrid
下面給出代碼：
資料結構：
表dep：depid（標識主鍵），depname（學院名字）
表stu：stuid（標識主鍵），stuname（學生名字），studepid（學院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" CssClass="border" OnEditCommand="edit" OnCancelCommand="cancel" OnUpdateCommand="update"
    DataKeyField="stuid">
    <ItemStyle CssClass="item"></ItemStyle>
    <HeaderStyle CssClass="header"></HeaderStyle>
    <Columns>
     <asp:TemplateColumn HeaderText="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="學院">
      <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="編輯"></asp:EditCommandColumn>
    </Columns>
   </asp:DataGrid>
  </form>
</body>
</HTML>
後台：
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 的摘要說明。
/// </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)
  {
   // 在此處放置使用者代碼以初始化頁面
   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("請選擇",""));

  }

  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 Form設計器產生的程式碼
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 該調用是 ASP.NET Web Form設計器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }

  /// <summary>
  /// 設計器支援所需的方法 - 不要使用代碼編輯器修改
  /// 此方法的內容。
  /// </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;//選擇資料庫內的作為預設
   }
  }

  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)//只有在編輯按下以後才能提交
   {
    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();//如果選擇過濾則使用SetBind3()
   }
  }

  private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
  {
   SetBind3();
  }
}
}
css：
.border {
background-color: #00496C;
}
.header {
font-family: "宋體", sans-serif;
font-size: 10pt;
font-weight: bold;
color: #FFFFFF;
background-color: #0080C0;
text-align: center;
}
.item {
font-family: "宋體", sans-serif;
font-size: 9pt;
font-weight: normal;
color: #0080C0;
background-color: #FFFFFF;
text-align: center;
}

代碼比較簡單，下面簡單說明一下：
（1）SetBind()是基本的綁定;SetBind2()是綁定外面的那個DropDownList;SetBind3()是在下拉框選擇了以後過濾後的DataGrid的綁定
（2）這裡使用Css來實現表格邊框是利用CellSpacing，所以這個數值就是邊框的寬度，在表格邊框的css中使用background-color來描述邊框的顏色。

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

Sales Support

1 on 1 presale consultation

Chat Contact Sales
After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

Open a Ticket
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

Learn More