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c# web DataTable DataRow上下移动

2011-07-11 22:43 381 查看

1）前台

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication4._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="gvwTitles" runat="server">
</asp:GridView>
<asp:Button ID="btnUp" runat="server" Text="上移" onclick="btnUp_Click" />
<asp:Button ID="btnDown" runat="server" Text="下移" onclick="btnDown_Click" />
</div>
</form>
</body>
</html>
2）后台

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
namespace DataRowDemo
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["dtTitles"] = null;
GetData();
BindData();
}
}
/// <summary>
/// 绑定数据
/// </summary>
private void BindData()
{
if (ViewState["dtTitles"] != null)
{
gvwTitles.DataSource = (DataTable)ViewState["dtTitles"];
gvwTitles.DataBind();
}
}
/// <summary>
/// 获取数据
/// </summary>
private void GetData()
{
ViewState["dtTitles"] = SetData();
//设置id为主键
((DataTable)ViewState["dtTitles"]).PrimaryKey = new DataColumn[] {((DataTable)ViewState["dtTitles"]).Columns["id"] };
}
protected void setRowToRow(DataRow dataRow, DataRow tempRow)
{
//tempRow["id"] = dataRow["id"];//主键唯一约束
tempRow["type"] = dataRow["type"];
}
/// <summary>
/// 上移
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnUp_Click(object sender, EventArgs e)
{
DataRow currentRow = ((DataTable)ViewState["dtTitles"]).Rows.Find(102);//根据主键获取当前row
DataRow[] rows = ((DataTable)ViewState["dtTitles"]).Select();//获取table中所有的row
int currentIndex = Array.IndexOf(rows, currentRow); //获取当前row的index
DataRow tempRow = ((DataTable)ViewState["dtTitles"]).NewRow();
setRowToRow(((DataTable)ViewState["dtTitles"]).Rows[currentIndex - 1], tempRow);
setRowToRow(((DataTable)ViewState["dtTitles"]).Rows[currentIndex], ((DataTable)ViewState["dtTitles"]).Rows[currentIndex - 1]);
setRowToRow(tempRow, ((DataTable)ViewState["dtTitles"]).Rows[currentIndex]);
BindData();
}
/// <summary>
/// 下移
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnDown_Click(object sender, EventArgs e)
{
DataRow currentRow = ((DataTable)ViewState["dtTitles"]).Rows.Find(102);
DataRow[] rows = ((DataTable)ViewState["dtTitles"]).Select();
int currentIndex = Array.IndexOf(rows, currentRow);
DataRow tempRow = ((DataTable)ViewState["dtTitles"]).NewRow();
setRowToRow(((DataTable)ViewState["dtTitles"]).Rows[currentIndex + 1], tempRow);
setRowToRow(((DataTable)ViewState["dtTitles"]).Rows[currentIndex], ((DataTable)ViewState["dtTitles"]).Rows[currentIndex + 1]);
setRowToRow(tempRow, ((DataTable)ViewState["dtTitles"]).Rows[currentIndex]);
BindData();
}
/// <summary>
/// 设置数据
/// </summary>
/// <returns></returns>
private DataTable SetData()
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("id"));
dt.Columns.Add(new DataColumn("type"));
DataRow dr1 = dt.NewRow();
dr1["id"] = 101;
dr1["type"] = "语文";
dt.Rows.Add(dr1);
DataRow dr2 = dt.NewRow();
dr2["id"] = 102;
dr2["type"] = "数学";
dt.Rows.Add(dr2);
DataRow dr3 = dt.NewRow();
dr3["id"] = 103;
dr3["type"] = "英语";
dt.Rows.Add(dr3);
return dt;
}
}
}

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标签： c# web 上下移动datarow

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