Question

拉出我的头发，一些帮助会很棒。

我在ASP中加载一个GridView，动态填充SQL语句的结果。此页面用于一般查询，因此从查询结果中提取标题名称，而不是模板。

我想要做的是调用一个标题，即SSN（敏感数据列）我想通过这个特定列中的每个单元格并屏蔽该字段。示例：“### - ## - ####”。在页面显示之前，所有更改都会保留在每次更改页面以及重新绑定GridView时。

我查看了一些事件，如GridView1_RowCreated，GridView1_OnDataBound

但是，每当我搜索header.text时，它总是空的！我可以改变并设置它，但它从未在这些事件中填充。这让我相信我在错误的地方做这个更新。

即：

Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

    Dim header As String

    ' DataControlRowType.DataRow - also tried this with checking HeaderText too.
    If e.Row.RowType = DataControlRowType.Header Then

        For columnIndex As Integer = 0 To e.Row.Cells.Count - 1 Step 1
            header = e.Row.Cells(columnIndex).Text                
            Response.Write(header) ' Empty
            Response.Write("Cell") ' Will Display this for each header cell. 
            header = String.Empty         
        Next

    End If

End Sub

我是否需要在Page_Load或PreRender上执行此操作？任何想法/例子都会很棒谢谢你的帮助。

Answer 1

如果您可以通过其标题文本确定特殊列，则可以找到列索引，然后在找到特定列时更改RowDataBound事件中单元格的文本。

这在我的测试中有效：

<强> ASPX：

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
      <div>
        <asp:GridView runat="server" ID="GridView1" />
      </div>
    </form>
</body>
</html>

代码整理：

Partial Public Class _Default
    Inherits Page

    Private _specialColumnName As String = "DEF"
    Private _specialColumnIndex As Integer = -1

    Private ReadOnly Property Data() As DataTable
        Get
            If Session("Default.Data") Is Nothing Then
                Dim value = New DataTable()

                Using connection = New SqlClient.SqlConnection("your_connection_string")
                    Using command = connection.CreateCommand()
                        command.CommandText = "SELECT * FROM your_table"

                        Using adapter = New SqlClient.SqlDataAdapter(command)
                            adapter.Fill(value)
                        End Using
                    End Using
                End Using

                'value.Columns.Add("ABC", GetType(String))
                'value.Columns.Add("DEF", GetType(Integer))
                'value.Columns.Add("GHI", GetType(Boolean))

                'value.Rows.Add("A", 1, True)
                'value.Rows.Add("B", 2, False)
                'value.Rows.Add("C", 3, False)

                Session("Default.Data") = value
            End If

            Return CType(Session("Default.Data"), DataTable)
        End Get
    End Property

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        GridView1.DataSource = Data
        GridView1.DataBind()
    End Sub

    Private Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs) Handles GridView1.RowDataBound
        If e.Row.RowType = DataControlRowType.Header Then
            For index As Integer = 0 To e.Row.Cells.Count - 1
                If e.Row.Cells(index).Text = _specialColumnName Then
                    _specialColumnIndex = index
                    Return
                End If
            Next
        ElseIf _specialColumnIndex > -1 AndAlso e.Row.RowType = DataControlRowType.DataRow Then
            e.Row.Cells(_specialColumnIndex).Text = "###"
        End If
    End Sub

End Class

ASP VB.NET GridView：使用AutogenerateColumn = True按列标题名称更改列单元格文本

1 个答案: