仅显示 CheckBoxList 中最后选择的项目

Question

我正在尝试对 CheckBoxList 进行数据绑定，但只选择了最后一项。

A​​SPX:

<asp:CheckBoxList ID="CityCheckBoxList" runat="server"
    DataSourceID="SqlDS1" DataTextField="City" 
    DataValueField="CityID" AutoPostBack="True">
</asp:CheckBoxList>

<asp:SqlDataSource ID="SqlDS1" runat="server" 
    ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
    SelectCommandType="StoredProcedure">
</asp:SqlDataSource>

隐藏代码：

using (SqlDataReader sdr = cmd.ExecuteReader())
{
    while (sdr.Read())
    {
        EmployeeIdTextBox.Text = sdr["EmployeeID"].ToString();
        EmployeeNameTextBox.Text = sdr["EmployeeName"].ToString();

        CityCheckBoxList.DataBind();
        ListItem currentCheckBox = CityCheckBoxList.Items.FindByValue(sdr["CityID"].ToString());
        if (currentCheckBox != null)
        {
            currentCheckBox.Selected = true;
        }
    }
}

如果员工属于多个城市，CityCheckBoxList 中只会显示最后一个城市。我做错了什么？

Answer 1

我认为是因为您将 CityCheckBoxList 绑定到数据库中的每个员工。复选框的数据绑定应该移到循环之外。试试这个：

using (SqlDataReader sdr = cmd.ExecuteReader())
{
    CityCheckBoxList.DataBind();
    while (sdr.Read())
    {
        EmployeeIdTextBox.Text = sdr["EmployeeID"].ToString();
        EmployeeNameTextBox.Text = sdr["EmployeeName"].ToString();    

        ListItem currentCheckBox = CityCheckBoxList.Items.FindByValue(sdr["CityID"].ToString());
        if (currentCheckBox != null)
        {
            currentCheckBox.Selected = true;
        }
    }
}