Question

无法将类型"object"隐式转换为"bool".存在一个显式转换(是否缺少强制转换?)

代码如下：
protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
ST_check_Login();

if (Session["ShopCart"] = null) 提示这里错误
{
this.labMessage.Text = "您还没有购物！";
this.labMessage.Visible = true;
this.lnkbtnCheck.Visible = false;
this.lnkbtnClear.Visible = false;
this.lnkbtnContinue.Visible = false;
}
else
{
hashCar = (Hashtable)Session["ShopCart"];
if (hashCar.Count == 0)
{
this.labMessage.Text = "您购物车中没有商品！";
this.labMessage.Visible = true;
this.lnkbtnCheck.Visible = false;
this.lnkbtnClear.Visible = false;
this.lnkbtnContinue.Visible = false;
}

Answer 1

错啦，是两个等号==不是一个等号=，一个等号是赋值。。。。。