Question

我创建了一个下拉列表控制器和gridview控制器。

gridview填充（显示）取决于下拉列表没有问题的值。

在我的sql表中，我有3列在gridview中，我想要做的是在gridview中只显示包含任何行数据的列。

例如：

我在下拉列表值1中选择然后显示Kolumn 1,3，因为那些包含行数据和colum 2为NULL。

我在下拉列表值2中选择，然后第2列将显示，因为它包含行数据并且列1,3为空

在我的下拉列表中，我有代码隐藏来打印下拉列表

在gridview中我有aspx代码。

更新了代码：这是我的ASPX代码。

<asp:GridView ID="FinanceGridView" runat="server" AutoGenerateColumns="False" CssClass = "FinanceGridView" 
    DataKeyNames="ID" DataSourceID="AdminPortal_ReportScheduling" 
    AllowPaging="True" AllowSorting="True" Visible="False">
    <Columns>
        <asp:BoundField DataField="Report" HeaderText="Report" 
            SortExpression="Report" />
        <asp:BoundField DataField="Business_Area" HeaderText="Business_Area" 
            SortExpression="Business_Area" />
        <asp:BoundField DataField="Salesdepartment" HeaderText="Salesdepartment" 
            SortExpression="Salesdepartment" />
        <asp:CommandField ButtonType="Button" 
            ShowEditButton="True">
        <ControlStyle BackColor="Black" ForeColor="White" />
        </asp:CommandField>
    </Columns>
</asp:GridView>

新的正确代码？

Dim SqlConnectionString As String = ConfigurationManager.ConnectionStrings("Test").ConnectionString
Protected Sub BindDataToGridView()
    Using SqlConnection As New SqlConnection(SqlConnectionString)
        SqlConnection.Open()
        Dim SqlCommand As New SqlCommand("Select ID,Report,[Business Area],[Salesdepartment] from dbo.test", SqlConnection)
        Dim SqlDataAdapter As New SqlDataAdapter(SqlCommand)
        Dim dataSet As New DataSet()
        SqlDataAdapter.Fill(dataSet)
        For Each col As DataControlField In Gridview1.Columns
            col.Visible = False
        Next
        For Each row As GridViewRow In Gridview1.Rows
            For i As Integer = 0 To row.Cells.Count - 1
                If row.Cells(i).Text.Replace("&nbsp;", String.Empty) <> String.Empty Then
                    Gridview1.Columns(i).Visible = True
                End If
            Next
        Next
        SqlConnection.Close()
    End Using
End Sub

Answer 1

如果您创建了自己的列并删除了AutoGenerateColumns，则可以这样做：

Protected Sub gvData_DataBound(sender As Object, e As EventArgs)
    For Each col As DataControlField in gvData.Columns
        col.Visible = false
    Next
    For Each row as GridViewRow in gvData.Rows
        For i As Integer = 0 to row.Cells.Count - 1
            If row.Cells(i).Text.Replace("&nbsp;", string.Empty) <> string.Empty Then
                gvData.Columns(i).Visible = True
            End If
        Next
    Next
End Sub

使用自动生成的列，这应该有效：

Protected Sub gvData_DataBound(sender as Object sender, e As EventArgs)
    Dim cols As New List(Of Boolean)
    For Each row As GridViewRow in gvData.Rows
        For i as Integer = 0 to row.Cells.Count - 1
            If cols.Count <= i
                cols.Add(False)
            End If
            If row.Cells(i).Text.Replace("&nbsp;", string.Empty) <> string.Empty Then
                cols(i) = True
            End If
        Next
    Next
    For i as Integer = 0 to gvData.HeaderRow.Cells.Count - 1 
        gvData.HeaderRow.Cells(i).Visible = cols(i)
    Next
    For Each row As GridViewRow in gvData.Rows
        For i As Integer = 0 to row.Cells.Count - 1
            row.Cells(i).Visible = cols(i)
        Next
    Next
End Sub

所有这些仅适用于显示文本的字段（不适用于显示为复选框的布尔字段）。我希望我对VB的翻译没问题。

Gridview autogeneratecolumns如果列有行

1 个答案: