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我在ListView的每個視圖中顯示圖像。我希望圖像在水平方向以及在一個方框中垂直居中。我的代碼如下:未顯示樣式屬性
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
我簡單地計算所需的頂部和左側圖像爲它爲中心的填充量,然後添加填充作爲風格屬性到周圍的標籤。
在aspx文件的代碼如下:
<a href='<%#Eval("Website") %>' id="LogoLink" runat="server">
<asp:Image ID="LogoImage" runat="server" AlternateText='<%#Eval("Name") %>' />
</a>
當我運行這段代碼,不填充已應用於<a>
標籤。所以我做了一個快速檢查,以確保PaddingTop
和PaddingLeft
正在使用Response.Write
正確計算。奇怪的是,這次我運行它時,style屬性正確顯示!但沒有Response.Write
,沒有樣式屬性。
我在做什麼錯?