C# 具有多个下拉列表的detailsview

我有一个

详细视图

如下：

<asp:DetailsView ID="detailsView1" runat="server"
    DataSourceID="edsdetailsView" AutoGenerateRows="False" CssClass="pretty-table">
    <Fields>
        <asp:TemplateField HeaderText="Cliente">
            <ItemTemplate>
                <asp:Label ID="dw1Label2" runat="server" Text='<%# Bind("Clienti.NomeSocieta") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
                <asp:DropDownList ID="ddlClienti" runat="server" SelectedValue='<%# Bind("IDCliente") %>'
                    Width="300" DataSourceID="EntityDataSourceClienti" DataTextField="NomeSocieta"
                    AutoPostBack="true" DataValueField='IDCliente' 
                    onselectedindexchanged="ddlClienti_SelectedIndexChanged">
                </asp:DropDownList>
            </EditItemTemplate>
            <InsertItemTemplate>
                <asp:DropDownList ID="ddlClienti" runat="server" SelectedValue='<%# Bind("IDCliente") %>'
                    Width="300" DataSourceID="EntityDataSourceClienti" DataTextField="NomeSocieta"
                    AutoPostBack="true" DataValueField='IDCliente' 
                    onselectedindexchanged="ddlClienti_SelectedIndexChanged">
                </asp:DropDownList>
            </InsertItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Contatto" SortExpression="IDContatto">
            <ItemTemplate>
                <asp:Label ID="Label6" runat="server" Text='<%# Bind("Contatti.Nome") %>'></asp:Label>
            </ItemTemplate>
            <EditItemTemplate>
                <asp:DropDownList ID="ddlContatti" runat="server" SelectedValue='<%# Bind("IDContatto") %>'
                    Width="300px" DataSourceID="edsContatti" DataTextField="Nome"
                    DataValueField='IDContatto'>
                </asp:DropDownList>
             </EditItemTemplate>
             <InsertItemTemplate>
                 <asp:DropDownList ID="ddlContatti" runat="server" SelectedValue='<%# Bind("IDContatto") %>'
                     Width="300" DataSourceID="edsContatti" DataTextField="Nome"
                     DataValueField='IDContatto'/>
             </InsertItemTemplate>
         </asp:TemplateField>
    </Fields>
</asp:DetailsView>

当我更改

Cliente

字段的选择时，我想更改另一个字段，

Contatto

。

Contatto

的

EntityDataSource

是：

<asp:EntityDataSource ID="edsContatti" runat="server" ConnectionString="name=SalesPortalEntities"
    DefaultContainerName="SalesPortalEntities" EnableFlattening="False" EntitySetName="Contatti"
    Where="it.IDAzienda=@IDClienteFromDdl">
    <WhereParameters>
        <asp:Parameter Name="IDClienteFromDdl" Type="Int32"/>
    </WhereParameters>
</asp:EntityDataSource>

背后的代码是：

protected void ddlClienti_SelectedIndexChanged(object sender, EventArgs e)
{
    edsContatti.WhereParameters[0].DefaultValue = ((DropDownList)sender).SelectedValue;        
}

如何在

DetailsView1

的插入和编辑模式中将

ddlContatti

连接到

ddlClienti

以下是详细信息视图的屏幕截图：

---

提前感谢。

在这里再试一次，如果这不起作用，我将不再浪费你的时间=）

---

@亚历山德罗：哎呀，我忘了控制参数。这实际上只需很少的工作就可以提供您想要的功能。如果有帮助，请告诉我！这是我的第一个代码，但如果我启动页面，将出现以下错误：在控制参数“idClientFromDDL”中找不到控件“ddlClienti”。@AlessandroG-Bah，我忘了ddl在GridView中。如果我想到其他事情，我会更新答案。@AlessandroG我又给了这一次机会（因为解决方案现在困扰着我了哈哈）。是的，它可以用detailsView1.DataBind（）更改ddlContatti.DataBind（）；可能是因为数据绑定是向儿童传播的。谢谢你，J。

<asp:EntityDataSource ID="edsdetailsView" runat="server" Include="Categorie,Commerciali,Clienti,Contatti"
    ConnectionString="name=SalesPortalEntities" OnInserting="UpdateDataSource" DefaultContainerName="SalesPortalEntities"
    EnableDelete="True" EnableFlattening="False" EnableInsert="True" EnableUpdate="True"
    EntitySetName="PianificazioneIncontri" Where="it.IDPianificazione = @IDPianificazione AND ((it.Obsoleto=false AND it.ApprovazioneModifica=false AND it.ApprovazioneEliminazione=false) OR (@GruppoAdmin='1' AND it.Obsoleto=false))"
    OnUpdating="edsdetailsView_Updating">
    <WhereParameters>
        <asp:ControlParameter ControlID="GridView1" Name="IDPianificazione" PropertyName="SelectedValue" Type="Int32" />
        <asp:Parameter Name="GruppoAdmin" Type="String" />
    </WhereParameters>
</asp:EntityDataSource>

protected void ddlClienti_SelectedIndexChanged(object sender, EventArgs e)
{
    edsContatti.WhereParameters[0].DefaultValue = ((DropDownList)sender).SelectedValue;        
}

protected void ddlClienti_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    edsContatti.WhereParameters[0].DefaultValue = ((DropDownList)sender).SelectedValue;
    // Call DataBind to reload the DataSource based on the new WHERE clause
    edsContatti.DataBind();
    // Since you're using a DetailsView, you have to find the nested control within it
    DropDownList ddlContatti = (DropDownList)DetailsView1.FindControl("ddlConcatti");
    // And then call DataBind on it as well
    detailsView1.DataBind();
}