.NET开发：用ASP、NET开发下载系统(三)

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用ASP、NET开发下载系统(三)

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用ASP、NET开发下载系统(三)

前台界面部分

主界面

主界面是左上部分是一个TreeView控件，用来添加分类信息。

主界面是左下部分是一个List控件，用来显示下载信息排行榜。

主界面是右边部分是一个DataGrid控件，用来显示下载信息。

这是一个基本的界面，如果需要更多功能，请自行扩充！

步骤：新建一项目(选择asp.net应用程序)，添加Web 引用, 重命名为DownWS

在窗体上添加DataGrid，用属性生成器设置其属性：列、分页、格式等，然后在代码中为DataGrid设置数据源，再绑定后，呈现上述样式。

再添加TreeView，List等控件。在程序中将数据添加到TreeView，详细代码请见下面：

注：

　　Internet Explorer WebControls不在VS.NET的标准Server Control中，到微软的站点下载：http://msdn.microsoft.com/downloads/samples/internet/default.asp?url=/Downloads/samples/Internet/ASP_DOT_NET_ServerControls/WebControls/default.asp 下载安装后第一次使用时，要右击工具箱Customize Toolbox…→.NET Framework Components中找到Micosoft.Web.UI.WebControls.Treeview后选中，这样Treeview控件就出现在工具箱中了。

downinfo.aspx.vb:

Imports System.Configuration

Imports System.Data

Imports System.Data.SqlClient

Imports Microsoft.Web.UI.WebControls

Public Class downInfo

Inherits System.Web.UI.Page

Protected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid

Protected WithEvents TreeView1 As Microsoft.Web.UI.WebControls.TreeView

Protected WithEvents Label2 As System.Web.UI.WebControls.Label

Protected WithEvents Label3 As System.Web.UI.WebControls.Label

Protected WithEvents ListBox1 As System.Web.UI.WebControls.ListBox

Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm

#Region " Web 窗体设计器生成的代码 "

'该调用是 Web 窗体设计器所必需的。

<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

End Sub

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init

' CODEGEN: 此方法调用是 Web 窗体设计器所必需的

'不要使用代码编辑器修改它。

InitializeComponent()

End Sub

#End Region

Dim downDv As New DataView()

Dim strName As String

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

strName = Request.QueryString("strName")

'实例化一个DownWebService

Dim WS As New DownWS.DownWebService()

Dim dsTree As DataSet

'得到所有的分类

dsTree = WS.GetDownClass

'填充到树状结构中

TreeView1.Nodes.Clear()

Dim Row As DataRow

For Each Row In dsTree.Tables(0).Rows

Dim item As New TreeNode()

item.Text = Row.Item("classname").ToString

'点击时的网址跳转

item.NavigateUrl = "downinfo.aspx?strname=" & Row.Item("classname").ToString

'每个分支的图片

item.ImageUrl = ResolveUrl(Me.TemplateSourceDirectory & "\tree.jpg")

TreeView1.Nodes.Add(item)

'得到所有下载信息,进行分类的过滤后，填充到DataGrid

downDv = WS.GetDownInfo().Tables(0).DefaultView

If strName <> "" Then

downDv.RowFilter = "classname='" & strName & "'"

End If

DataGrid1.DataSource = downDv

DataGrid1.DataBind()

End Sub

Private Sub DataGrid1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DataGrid1.SelectedIndexChanged

'得到当前的ID

Dim nID As Int32 = DataGrid1.SelectedItem.Cells(0).Text

'得到URL

Dim strUrl As String = "downdetail.aspx?ID=" + nID.ToString()

'打开一个窗口,没有工具栏，状态条

Response.Write("<script language='javascript'>open('" + strUrl + "','pop','directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,height=450,width=595');</script>")

End Sub

Private Sub DataGrid1_PageIndexChanged(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridPageChangedEventArgs) Handles DataGrid1.PageIndexChanged

'处理分页

DataGrid1.CurrentPageIndex = e.NewPageIndex

DataGrid1.DataSource = downDv

DataGrid1.DataBind()

End Sub

End Class

downinfo.aspx:

<%@ Register TagPrefix="iewc" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls, Version=1.0.2.226, Culture=neutral, PublicKeyToken=31bf3856ad364e35" %>

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="downInfo.aspx.vb" Inherits="WebApplication9.downInfo"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<title>XX下载系统</title>

</HEAD>

<asp:BoundColumn DataField="id" HeaderText="编号">

</asp:BoundColumn>

<asp:BoundColumn DataField="classname" HeaderText="分类名称">

</asp:BoundColumn>

<asp:HyperLinkColumn DataNavigateUrlFormatString="webform2.aspx?ID={0}" DataTextField="title" HeaderText="标题" NavigateUrl="filename">

</asp:HyperLinkColumn>

<asp:BoundColumn DataField="uploadtime" HeaderText="上传时间">

</asp:BoundColumn>

<asp:BoundColumn DataField="totaldown" HeaderText="下载次数">

</asp:BoundColumn>

<asp:ButtonColumn Text="下载" HeaderText="下载" CommandName="Select">

</asp:ButtonColumn>

</Columns>

</asp:datagrid></FONT></DIV>

</form>

</FONT>

</body>

</HTML>

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