将值从 ListView 传递到 EntityDataSource答案

【问题标题】：passing a value from ListView to EntityDataSource将值从 ListView 传递到 EntityDataSource
【发布时间】：2011-01-24 14:43:52
【问题描述】：

我有这段代码，我需要将“where”子句中的“it.MembershipOption.Id”值作为 ListViewEventsOuter 中的。我试图在“where”子句中添加 Eval，但它会引发错误。

这是怎么做到的？

<asp:ListView ID="ListViewEventsOuter" runat="server">
    <ItemTemplate>
        <a name='<%# Eval("Id") %>'></a>
        <h3>Events for <%# Eval("Text")%> members</h3>

        <asp:EntityDataSource ID="EntityDataSource1" runat="server" 
        ConnectionString="name=Entities" Include="EventType, MembershipOption" 
        DefaultContainerName="Entities" EntitySetName="Events" 
        EntityTypeFilter="" Select="" Where='it.Active == True && it.MembershipOption.Id == [THIS VALUE TO COME FROM THE PREVIOUS ID IN LISTVIEW]'>
        </asp:EntityDataSource>

        <asp:ListView ID="ListViewEventsInner" runat="server">

              ETC....

【问题讨论】：

标签： .net entity-framework data-binding

【解决方案1】：

解决方案：

<asp:EntityDataSource ID="EntityDataSource1" runat="server" 
                    ConnectionString="name=Entities" Include="EventType, MembershipOption" 
                    DefaultContainerName="Entities" EntitySetName="Events" 
                    EntityTypeFilter="" Select="" Where='it.Active == True && it.MembershipOption.Id == @membershipOptionId'>
                    <WhereParameters>
                        <asp:Parameter Name="membershipOptionId" DbType="Int32" DefaultValue="2" />
                    </WhereParameters>
                </asp:EntityDataSource>


protected void ListViewEventsOuter_ItemDataBound(object sender, ListViewItemEventArgs e)
        {
            ListViewDataItem item = (ListViewDataItem)e.Item;
            MembershipOption m = (MembershipOption)item.DataItem;
            string membershipOptionId = m.Id.ToString();

            EntityDataSource entityDataSource1 = (EntityDataSource)e.Item.FindControl("EntityDataSource1");
            Parameter parameter = entityDataSource1.WhereParameters[0];
            parameter.DefaultValue = membershipOptionId.ToString();

        }

【讨论】：