ListItem.Selected返回true

Question

我有一个CheckBoxList，我循环遍历所有ListItems并查看是否有其中任何一个被检查过。

奇怪的是，虽然只检查了其中一个，但它认为所有这些都已经过检查。

C＃代码：

foreach (ListItem item in cblPermissions.Items)
{
    if (item.Selected)
    {
        // Even though it's not checked on the HTML page - This code still runs.
    }
}

这是我绑定数据的方式：

private void BindPermissions()
{
    var roles =
        RoleInfoProvider.GetAllRoles(
            string.Format("RoleName like 'EmployerAdmin[_]%' AND SiteID = {0} AND RoleName NOT LIKE '%Super_User%'",
                          CMSContext.CurrentSiteID));

    cblPermissions.DataSource = roles;
    cblPermissions.DataBind();
    var userInfo = UserInfoProvider.GetUserInfoByGUID(QueryHelper.GetGuid("guid", Guid.Empty));

    if (userInfo != null)
    {
        var isSuperUser = userInfo.IsInRole(Constants.EmployerAdminSuperUserRole, CMSContext.CurrentSiteName);
        if (!isSuperUser)
        {
            var userRoles = UserInfoProvider.GetUserRoles(userInfo);
            foreach (DataRow row in userRoles.Rows)
            {
                var roleName = row["RoleName"].ToString();
                var roleItem = cblPermissions.Items.FindByValue(roleName);
                if (roleItem != null)
                {
                    roleItem.Selected = true;
                }
            }
        }
        else
        {
            MarkAllPermissionsAsChecked();
        }
    }
}

HTML：

<asp:CheckBoxList runat="server" ID="cblPermissions" DataValueField="RoleName" DataTextField="RoleDescription"/>

为什么会发生这种情况？