1
我在ListView的每个视图中显示图像。我希望图像在水平方向以及在一个方框中垂直居中。我的代码如下:未显示样式属性
Protected Sub MembersLV_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles MembersLV.ItemDataBound
If e.Item.ItemType = ListViewItemType.DataItem Then
Dim LogoImage As System.Web.UI.WebControls.Image = e.Item.FindControl("LogoImage")
Dim LogoLink As HtmlControl = e.Item.FindControl("LogoLink")
Dim di As ListViewDataItem = DirectCast(e.Item, ListViewDataItem)
Dim ImageFileName As String = di.DataItem("FileName")
Dim FilePath As String = String.Format("/Uploads/MembersDirectory/w125h85/{0}", ImageFileName)
If File.Exists(Server.MapPath(FilePath)) Then
LogoImage.ImageUrl = FilePath
Dim BoxHeight As Integer = 101
Dim BoxWidth As Integer = 138
Dim B As New Bitmap(Server.MapPath(FilePath))
Dim BHeight As Integer = B.Height
Dim BWidth As Integer = B.Width
Dim PaddingTop As Integer = Math.Ceiling(BoxHeight - BHeight)/2
Dim PaddingLeft As Integer = Math.Ceiling(BoxWidth - BWidth)/2
LogoLink.Attributes.Add("style", String.Format("padding: {0} 0 0 {1};", PaddingTop, PaddingLeft))
End If
End If
End Sub
我简单地计算所需的顶部和左侧图像为它为中心的填充量,然后添加填充作为风格属性到周围的标签。
在aspx文件的代码如下:
<a href='<%#Eval("Website") %>' id="LogoLink" runat="server">
<asp:Image ID="LogoImage" runat="server" AlternateText='<%#Eval("Name") %>' />
</a>
当我运行这段代码,不填充已应用于<a>
标签。所以我做了一个快速检查,以确保PaddingTop
和PaddingLeft
正在使用Response.Write
正确计算。奇怪的是,这次我运行它时,style属性正确显示!但没有Response.Write
,没有样式属性。
我在做什么错?