圖片按鈕不會在頁面加載時隱藏

Question

我使用下面的代碼在頁面加載時隱藏了模板字段Imagebutton，但是它不起作用，請提前感謝：

Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load
            Dim ImageButton1 As ImageButton = DirectCast(GridView1.FindControl("ImageButton1"), ImageButton)
            If User.Identity.Name.Substring(InStr(User.Identity.Name, "\")).ToUpper = "User1" Then
                ImageButton1.Visible = False
            End If
        End Sub

Answer 1

假設您binding grid before and it has rows有binding grid before and it has rows 。 在網格的某些行中找到ImageButton，而不是在gridview中找到 。 if您要比較的if條件似乎永遠不會成立，因為您正在將ToUpper之后的字符串與非大寫的字符串進行比較，請在使用ToUpper時將Change User1 to USER1 。

更改

 Dim ImageButton1 As ImageButton = DirectCast(GridView1.FindControl("ImageButton1"), ImageButton) 
 If User.Identity.Name.Substring(InStr(User.Identity.Name, "\")).ToUpper = "User1" Then
            ImageButton1.Visible = False
 End If

至

   Dim ImageButton1 As ImageButton = DirectCast(GridView1.Rows(0).FindControl("ImageButton1"), ImageButton)
 If User.Identity.Name.Substring(InStr(User.Identity.Name, "\")).ToUpper = "USER1" Then
       ImageButton1.Visible = False
 End If

循環遍歷整個網格

For Each row As GridViewRow In GridView1.Rows
 Dim ImageButton1 As ImageButton = DirectCast(row.FindControl("ImageButton1"), ImageButton)
     If User.Identity.Name.Substring(InStr(User.Identity.Name, "\")).ToUpper = "USER1" Then
           ImageButton1.Visible = False
     End If
Next