|
保存美丽记忆 用ASP.NET创建网络相册(3) RepeatColumns="3">
<ItemTemplate>
<li><asp:HyperLink runat="server" id="lnkPic" /></li>
</ItemTemplate>
</asp:DataList>
在上面的代码中，在DATALIST的onitemdatabound事件中，首先判断当前触发的项目是否是列表项listitemtype或者是交替项AlternatingItem，如果是的话，则动态生成链接hl,设置hl的值为当前正在浏览图象的文件名，并且注明了文件的大小，设置其链接的地址为当前浏览图象的地址，这样，用户可以直接点要浏览的图片了，不一要通过上一张，下一张的链接来实现。
最后给出运行的一个例子（http://aspnet.4guysfromrolla.com/London/）和全部代码：
<%@ Import Namespace="System.IO" %>
<script runat="server" language="VB">
Sub Page_Load(sender as Object, e as EventArgs)
Dim dirInfo as New DirectoryInfo(Server.MapPath(""))
Dim images() as FileInfo = FilterForImages(dirInfo.GetFiles())
Dim imgIndex as Integer = 0
If Not Request.QueryString("N") is Nothing AndAlso IsNumeric(Request.QueryString("N")) then
imgIndex = CInt(Request.QueryString("N"))
End If
currentImgTitle.Text = "You are Viewing: " & _
Path.GetFileNameWithoutExtension(images(imgIndex).Name) & _
" (" & imgIndex + 1 & " of " & images.Length & ")"
currentImg.ImageUrl = Path.GetFileName(images(imgIndex).Name)
If imgIndex > 0 then
lnkPrev.NavigateUrl = "Default.aspx?N=" & imgIndex - 1
End If
If imgIndex < images.Length - 1 then
lnkNext.NavigateUrl = "Default.aspx?N=" & imgIndex + 1
End If
dlIndex.DataSource = images
dlIndex.DataBind()
End Sub
Function FilterForImages(images() as FileInfo) as FileInfo()
Dim newImages as New ArrayList(images.Length)
Dim i as Integer
For i = 0 to images.Length - 1
If Path.GetExtension(images(i).Name) = ".jpg" OrElse _
Path.GetExtension(images(i).Name) = ".jpeg" OrElse _
Path.GetExtension(images(i).Name) = ".png" OrElse _
| 
