Question

我试图对CheckBoxList进行数据绑定，但只选择了最后一项。

ASPX：

<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>

代码背后：

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，则只会在CityCheckBoxList中显示最后一个城市。我做错了什么？

Answer 1

我认为因为你对数据库中的每个员工都绑定了CityCheckBoxList。复选框的数据绑定应移到循环外部。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;
        }
    }
}

仅显示CheckBoxList中的最后选定项目

1 个答案: