Question

我在Page_PreRender事件中编写了一些代码，它获取DropDownList控件的值，然后执行一些条件逻辑。问题是，逻辑一定不是很好。

第一个If ..然后.. Else ..结构工作正常，但是，如果selectedItem 不＆＃34; Todos＆＃34; （葡萄牙语为＆＃34;所有＆＃34;）所有行＆＃39;可见性将设置为false。当If SelectedItem <> "Todos" Then条件得到满足时，似乎会出现这个问题。

因此，除了＆＃34; Todos＆＃34;之外，DropDownList中的每个选项都是如此。将所有行的可见性设置为False，而不是将不匹配SelectedItem的可见性设置为False。

Protected Sub Page_PreRender(sender As Object, e As EventArgs) Handles Me.PreRender
    'Getting the selected item
    Dim SelectedItem As String = CType(GridView1.HeaderRow.Cells(3).FindControl("DropDownList1"), DropDownList).SelectedItem.Text
    If SelectedItem <> "Todos" Then
        'This is the part where the issue seems to be located.                        
        For Each Row As GridViewRow In GridView1.Rows
            'Get the Text value 
            Dim depar As String = Row.Cells(3).Text
            'If its different from the SelectedItem then the row's visible property should be set to false, if it's a match, set it to true.

            If depar <> SelectedItem Then
                Row.Visible = False
            ElseIf depar = SelectedItem Then
                Row.Visible = True
            End If
        Next
        'If "Todos" was selected, all rows should be visible
    ElseIf SelectedItem = "Todos" Then
        'Make all rows visible
        For Each row As GridViewRow In GridView1.Rows
            row.Visible = True
        Next
    End If
End Sub

GridView代码：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="SqlDataSource1" PageSize="20" Width="100%"  >
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" />
                    <asp:LinkButton ID="LinkButton1" runat="server" CommandArgument='<%#CType(Container, GridViewRow).DataItem("IdPedido") %>' OnClick="LinkButton1_Click" OnCommand="LinkButton1_Command">Ver</asp:LinkButton>
                </ItemTemplate>
                <HeaderStyle Width="40px" />
            </asp:TemplateField>
            <asp:BoundField DataField="Observacoes" HeaderText="Assunto" SortExpression="Observacoes" />
            <asp:BoundField DataField="NomeHotel" HeaderText="Hotel" SortExpression="NomeHotel" />
            <asp:TemplateField HeaderText="Departamento" SortExpression="NomeDepartamento">
                <HeaderTemplate>

                    Departamento<br />
                    <asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="True" DataSourceID="SqlDataSource1" DataTextField="NomeDepartamento" DataValueField="IdDepartamento" AutoPostBack="True" OnLoad="DropDownList1_Load" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                        <asp:ListItem>Todos</asp:ListItem>
                    </asp:DropDownList>
                    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:EnotelSuporteConnectionString1 %>" SelectCommand="SELECT [NomeDepartamento], [IdDepartamento] FROM [Departamentos]"></asp:SqlDataSource>

                </HeaderTemplate>
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("NomeDepartamento") %>'></asp:TextBox>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("NomeDepartamento") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:BoundField DataField="DataPedido" HeaderText="Data" DataFormatString = "{0:dd, MMM yyyy}" SortExpression="DataPedido" />
            <asp:BoundField DataField="DataFinalizado" HeaderText="Finalizado a" DataFormatString = "{0:dd, MMM yyyy}" SortExpression="DataFinalizado" />
            <asp:BoundField DataField="Nome" HeaderText="Nome" SortExpression="Nome" />
            <asp:BoundField DataField="Estado" HeaderText="Estado" SortExpression="Estado" Visible="False" />
            <asp:BoundField DataField="IdPedido" HeaderText="IdPedido" InsertVisible="False" ReadOnly="True" SortExpression="IdPedido" Visible="False" />
        </Columns>
    </asp:GridView>

Answer 1

Row.Cells(3).Text中的问题是，您使用ItemTemplate定义了gridview中的Label，并获得了ItemTemplates值找到控件，然后从该控件中获取值。如果您想要标签的值，请使用以下代码获取值

Label label = (Label)Row.Cells(3).FindControl("Label1");
if(label != null)
   string depar = label.Text;

注意
代码在c＃中，您可能希望将其转换为VB。

过滤GridView行无效

1 个答案: