帶下拉式過濾器的中繼器（Asp.net/C＃）

Question

我有一個連接到訪問數據庫的中繼器。中繼器使用％＃Eval（「text」）％>命令和AccessDataSource抽取信息。

我能夠顯示inital數據正常，但我希望能夠使用一系列下拉列表過濾記錄。例如，只能通過「製作」「年」「彩色」列出汽車。我已經能夠過濾數據如何我想要的，但這是通過顯示它在第二個中繼器和使用另一個AccessDataSource。理想情況下，我想只使用一個相應更新的中繼器。

有什麼建議嗎？謝謝。

<asp:AccessDataSource ID="AccessDataSource1" runat="server" 
DataFile="~/App_Data/Cars.accdb" 
SelectCommand="SELECT * FROM [Cars]"> 
</asp:AccessDataSource> 


<asp:AccessDataSource ID="AccessDataSource2" runat="server" 
    DataFile="~/App_Data/Cars.accdb" 
     SelectCommand="SELECT Make, [Year], Model, Colour, Artwork, Type, WHERE (Colour = ?)"> 
<SelectParameters> 
    <asp:ControlParameter ControlID="ColourDropdown" Name="Colour" PropertyName="SelectedValue" Type="String" /> 
</SelectParameters> 
</asp:AccessDataSource> 




<asp:DropDownList ID="GenreDropdown" runat="server" 
    DataSourceID="AccessDataSource1" DataTextField="Colour" DataValueField="Colour" 
    AppendDataBoundItems="True" CssClass="form-control" DataMember="DefaultView"  AutoPostBack="True" > 
<asp:ListItem Value="%"</asp:ListItem> 
</asp:DropDownList> 




<asp:Repeater ID="Repeater2" runat="server" DataSourceID="AccessDataSource1"> 
<ItemTemplate> 
     <div class="row list-group-item active"> 
      <div class="col-xs-2">   
      <p class="list-group-item-text active"><img src="carimages/<%#Eval("Artwork")%>" /></div> 
      <div class="col-xs-4">  
      <h4 class="list-group-item-heading"><%# Eval("Make")%> (<%# Eval("Year") %>)</h4> 
      <p class="list-group-item-text"><%# Eval("Model")%></p> 
      <p class="list-group-item-text"><%# Eval("Colour")%></p> 
      <p class="list-group-item-text"><%# Eval("Type")%></p></div> 
      <div class="col-xs-4"> 
      </div> 
      </a> 
      </div> 
</ItemTemplate> 
</asp:Repeater> 



<asp:Repeater ID="Repeater3" runat="server" DataSourceID="AccessDataSource2"> 
<ItemTemplate> 
     <div class="row list-group-item active"> 
      <div class="col-xs-2">   
      <p class="list-group-item-text active"><img src="carimages/<%#Eval("Artwork")%>" /></div> 
      <div class="col-xs-4">  
      <h4 class="list-group-item-heading"><%# Eval("Make")%> (<%# Eval("Year") %>)</h4> 
      <p class="list-group-item-text"><%# Eval("Model")%></p> 
      <p class="list-group-item-text"><%# Eval("Colour")%></p> 
      <p class="list-group-item-text"><%# Eval("Type")%></p></div> 
      <div class="col-xs-4"> 
      </div> 
      </a> 
      </div> 
</ItemTemplate> 
</asp:Repeater> 

Answer 1

爲此，您需要將參數添加到數據源動態地（也就是在後面的代碼），而不是裝飾性。因此，在標記，你應該離開這個（猜這是你原來的佈局）：

<asp:AccessDataSource ID="AccessDataSource1" runat="server" 
    DataFile="~/App_Data/Cars.accdb" 
    SelectCommand="SELECT * FROM [Cars]"> 
</asp:AccessDataSource> 

<asp:DropDownList ID="GenreDropdown" runat="server" 
    DataSourceID="AccessDataSource1" DataTextField="Colour" DataValueField="Colour" 
    AppendDataBoundItems="True" CssClass="form-control" DataMember="DefaultView"  AutoPostBack="True" > 
    <asp:ListItem Value="%"></asp:ListItem> 
</asp:DropDownList> 

<asp:Repeater ID="Repeater2" runat="server" DataSourceID="AccessDataSource1"> 
<ItemTemplate> 
     <div class="row list-group-item active"> 
      <div class="col-xs-2">   
      <p class="list-group-item-text active"><img src="carimages/<%#Eval("Artwork")%>" /></div> 
      <div class="col-xs-4">  
      <h4 class="list-group-item-heading"><%# Eval("Make")%> (<%# Eval("Year") %>)</h4> 
      <p class="list-group-item-text"><%# Eval("Model")%></p> 
      <p class="list-group-item-text"><%# Eval("Colour")%></p> 
      <p class="list-group-item-text"><%# Eval("Type")%></p></div> 
      <div class="col-xs-4"> 
      </div> 
      </a> 
      </div> 
</ItemTemplate> 
</asp:Repeater> 

而且在後面的代碼，說在頁面加載，這樣做：

AccessDataSource1.SelectParameters.Add("Colour", GenreDropdown.SelectedValue); 
Repeater2.DataBind(); 

Answer 2

您可以結合而下拉菜單，其中檢索SelectedIndexChanged事件數據和這個東西re.bind您的DataRepeater邏輯依賴從您的最終目標

UPDATE 這是一個函數的調用A示例使其適應你的邏輯

Private Sub ddlsomethinhg_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ddlsomethinhg.SelectedIndexChanged 
    //ASSUME INDEX 0 IS NOT VALID VALUE 
    If ddlsomethinhg.SelectedIndex = 0 Then 
     Exit Sub 
    Else 
     //ASSUME THAT IS INTEGER 
     Dim SEARCHVALUE As Integer = CInt(ddlsomethinhg.SelectedValue) 
     Dim QRY As String = String.Format("select * from TABLE where colname={0}", SEARCHVALUE) 
     Using cnn As New OleDbConnection("CONNECTIONSTRING") 
      If cnn.State = ConnectionState.Closed Then cnn.Open() 
      Using CMD As New OleDbCommand(QRY, cnn) 
       Using da As New OleDbDataAdapter(CMD) 
        Using ds As New DataSet 
         da.Fill(ds) 
         //if repeater2 is bounf in aspx page you will throw an exceptio so before you need to clean up datasource 
         Dim r As New Repeater 
         Repeater2.DataSourceID = "" 
         Repeater2.DataSource = ds.Tables(0) 
         Repeater2.DataBind() 
        End Using 
       End Using 
      End Using 

     End Using 
    End If 
End Sub