Question

我有一个GridView I填充，并希望根据登录的用户是管理员还是用户来显示/隐藏编辑链接。我没有收到任何错误，但无法弄清楚为什么它不起作用。

ASPX

    <asp:GridView ID="RepView" runat="server" HeaderStyle-BackColor="#bfbfbf" HeaderStyle-ForeColor="White" HeaderStyle-Font-Underline="true" CellPadding="2" GridLines="None" AutoGenerateColumns="false" Width="990px">
    <AlternatingRowStyle BackColor="#DCDCDC" />
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="Id" />
        <asp:BoundField DataField="FirstName" HeaderText="First Name" />
        <asp:BoundField DataField="LastName" HeaderText="Last Name" />
        <asp:BoundField DataField="EmployeeId" HeaderText="Employee Id" />
        <asp:BoundField DataField="Shift" HeaderText="Shift" />
        <asp:BoundField DataField="Supervisor" HeaderText="Supervisor" />
        <asp:BoundField DataField="Center" HeaderText="Center" />
        <asp:BoundField DataField="DateSubmitted" HeaderText="Date Entered" />

        <asp:TemplateField ItemStyle-HorizontalAlign="Center" HeaderText="Details">
              <ItemTemplate>                       
                      <a href="/Admin/Details.aspx?AssignmentID=<%# Eval("Id") %>">Edit</a>                     
              </ItemTemplate>
        </asp:TemplateField>

    </Columns>
</asp:GridView>

代码

    Private Sub BindGrid()
    Dim DefaultConnection As String = ConfigurationManager.ConnectionStrings("DefaultConnection").ConnectionString
    Using con As New SqlConnection(DefaultConnection)
       'This is not working...
        If My.User.IsInRole("User") Then
            RepView.Columns(9).Visible = False
        ElseIf My.User.IsInRole("Admin") Then
            RepView.Columns(9).Visible = True
        End If
        ' End of questionable part....

        Using cmd As New SqlCommand()
            cmd.CommandText = ("SELECT * from Reps")
            cmd.Connection = con
            con.Open()
            RepView.DataSource = cmd.ExecuteReader()
            RepView.DataBind()
            con.Close()
        End Using
    End Using
End Sub

Answer 1

尝试将“可疑部分”后面的代码从Private Sub BindGrid（）移动到gridview_Load事件。我的猜测是发生了什么是gridview正在加载，然后它到你的代码私有子BindGrid（）来显示/隐藏列，但列已经加载，因此它无法隐藏它们。除非您运行检查并在加载事件中显示/隐藏列，否则它将在运行此代码后继续显示列。

另一个可能的解决方案是，在Private Sub BindGrid（）中，您试图在查询之前隐藏列，这意味着尚未创建列，因此您必须先创建列，然后才能隐藏他们。将可疑部分向下移动到sql命令下面。

尝试这样的事情......

Protected Sub GridView1_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
    Dim x As Integer = 0
    If x = 0 Then
        GridView1.Columns(0).Visible = False
    Else
        GridView1.Columns(0).Visible = True
    End If
End Sub

我测试了这个并使用x = 0将使用x = 1隐藏第一列将显示第一列。

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataKeyNames="ID" DataSourceID="SqlDataSource1">

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:Sprayer_Parts_CatalogConnectionString %>" 
        SelectCommand="SELECT [ID], [Order#] AS column1, [Gallon], [Price] FROM [Tanks]">
    </asp:SqlDataSource>

基于Role在gridview中显示/隐藏列

1 个答案: