ASP.NET：DataValueField中的DropDownList [英] ASP.NET: DataValueField in DropDownList

问题描述

我试图创建两个的dropdownlist，第一个与用户的列表，并且仅当我点击OK按钮，显示占所述用户的列表中的第二一个可见。 ASPX页面具有以下code：

I'm trying to create two dropdownlist, the first one with a list of users, and the second one visible only when i click the OK button, showing a list of accounts for the user. The aspx page has the following code:

User:
<asp:SqlDataSource id="sourceUsers" runat="server" ConnectionString="<%$ ConnectionStrings:ct2012 %>"
    SelectCommand="SELECT name, id FROM users" />
<asp:DropDownList id="codUsers" runat="server" DataSourceID="sourceUsers"
    DataTextField="name" DataValueField="id" AutoPostBack="true" >
</asp:DropDownList>
<br />
Conto:
<asp:SqlDataSource id="sourceAccounts" runat="server" ConnectionString="<%$ ConnectionStrings:ct2012 %>" />
<asp:DropDownList id="accUsers" runat="server" DataSourceID="sourceAccounts"
    DataTextField="code" DataValueField="id" Visible="false" >
</asp:DropDownList>
<br />
<asp:Button ID="btOK" text="OK" OnClick="cmdNew_Click" runat="server" />

在C＃code处理按钮事件是：

The c# code to handle the button event is:

protected void cmdNew_Click(object sender, EventArgs e)
    {
        sourceAccounts.SelectCommand = "SELECT code, id FROM accounts WHERE ID_user=" + codUsers.DataValueField;
        accUsers.Visible = true;
    }

问题在于codUsers.DataValueField返回我的字符串ID，而不是指数值....

The problem is that codUsers.DataValueField returns me the string "id" instead of the value of the index....

推荐答案

尝试

codUsers.SelectedValue;

这应该为你工作。

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