牛腩购物26:购物车页面的整合，判断是否是验证了登陆用户

点击立即购买-> 把商品加入到购物车中->弹出一个选择框，选择 是到 购物车还是继续购物->

shopcart.aspx->order_modify.aspx->order_confirm.aspx->order_ok.aspx

1:是否是登陆用户 User.Identity.IsAuthenticated





2:在tool.cs 工具类里面增加一个后台执行 js 的方法。(要注意这里的 js 加了一个 defer 表示网页全部执行之后，再执行 js。相当于是 body加载完之后，才执行js，这样可以避免，图片还没有加载完就弹出了js，那样的话，就会显示空白的图或者是空白的背景，所以要加 defer )

.codearea{ color:black; background-color:white; line-height:18px; border:1px solid #4f81bd; margin:0; width:auto !important; width:100%; overflow:auto; text-align:left; font-size:12px; font-family: "Courier New","Consolas","Fixedsys","BitStream Vera Sans Mono", courier,monospace,serif}
.codearea pre{ color:black; line-height:18px; padding:0 0 0 12px !important; margin:0em; background-color:#fff !important}
.linewrap pre{white-space:pre-wrap; white-space:-moz-pre-wrap; white-space:-pre-wrap; white-space:-o-pre-wrap; word-wrap:break-word; word-break:normal}
.codearea pre.alt{ background-color:#f7f7ff !important}
.codearea .lnum{color:#4f81bd;line-height:18px}

/// <summary>后台执行alert方法
///
/// </summary>
/// <param name="mes"></param>
/// <param name="_page"></param>
public static void alert(string mes, Page _page)
{
_page.ClientScript.RegisterStartupScript(_page.GetType(), "message", "<script language='javascript' defer>

alert('" + mes + "');</script>");
}

/// <summary>后台执行javascript代码
///
/// </summary>
/// <param name="js">js代码,不需要写外面的script type·</param>
/// <param name="_page"></param>
public static void ExecJs(string js, Page _page)
{
_page.ClientScript.RegisterStartupScript(_page.GetType(), "ExecJs", "<script language='javascript' defer>

" + js + "</script>");
}

/// <summary>后台执行alert方法,并跳转到指定页面
///
/// </summary>
/// <param name="mes">alert的语句</param>
/// <param name="url">跳转到的页面</param>
/// <param name="_page"></param>
public static void alert(string mes,string url, Page _page)
{
if (!string.IsNullOrEmpty(url))
{
_page.ClientScript.RegisterStartupScript(_page.GetType(), "message", "<script language='javascript' defer>

alert('" + mes + "');location.href='" + url + "'</script>");
}
else
{
_page.ClientScript.RegisterStartupScript(_page.GetType(), "message", "<script language='javascript' defer>

alert('" + mes + "');</script>");
}
}

3：用户注销退出

FormsAuthentication.SignOut();

Session["cart"] = null; //退出登录的时候，要把购物车给清空掉

Response.Redirect("~/default.aspx");

4：批量添加进购物车，用到 checkbox

//批量添加进购物车
protected void btnAdd_Click(object sender, EventArgs e)
{
//我们在批量添加进购物的时候，需要对 收藏的 rep 进行循环，来判断到底是 哪个 checkbox 被选中了，选中的话，获取商品id

foreach (RepeaterItem item in repFav.Items)
{
CheckBox chk = item.FindControl("chkId") as CheckBox;
if (chk.Checked==true)
{
string proid = (item.FindControl("hfProid") as HiddenField).Value;

Model.Product pt = new DAL.ProductDAO().GetModel(int.Parse(proid));

Model.User u = new DAL.UserDAO().GetModel(User.Identity.Name);
decimal price = 0;
if (pt != null && u != null)
{
if (u.type == "vip")    //如果是会员，则是会员价
{
price = pt.vipprice;
}
else
{
price = pt.memberprice;
}
}

if (Session["cart"] != null)
{
//如果不等于空的话，我们就先取出来，然后再加进去
Niunan.Shop.Model.ShopCart sc = Session["cart"] as Niunan.Shop.Model.ShopCart;
sc.Add(int.Parse(proid), new Model.ShopItem
{
proid = int.Parse(proid),
price = price,
quantity = 1
});
Session["cart"] = sc;

}
else
{
Niunan.Shop.Model.ShopCart sc = new Model.ShopCart();
sc.Add(int.Parse(proid), new Model.ShopItem
{
proid = int.Parse(proid),
price = price,
quantity = 1
});

//然后把购物车，放到session里面
Session["cart"] = sc;
}

//最后弹出提示  是继续购买，还是去购物车
Utility.Tool.ExecJs("if(confirm('添加成功，是否跳转到购物车？')){location.href='/shopcart.aspx'}

else{location.href='" + Request.Url.ToString() + "'}", this.Page);
}
}
}

5：Repeater.ItemDataBound 事件

该事件在 Repeater 控件中的某一项被数据绑定后但尚未呈现在页面上之前发生。

//当rep循环绑定的时候，执行的事件
protected void rep_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
{
string proid = (e.Item.FindControl("hfProid") as HiddenField).Value;

Model.Product pt = new DAL.ProductDAO().GetModel(int.Parse(proid));
if (pt != null)
{
//再在  rep 里面找控件
Literal proname = e.Item.FindControl("litProName") as Literal;
Literal litMember = e.Item.FindControl("litMember") as Literal;
Literal litVip = e.Item.FindControl("litVip") as Literal;
Literal litXiaoJi = e.Item.FindControl("litXiaoJi") as Literal;

proname.Text = pt.proname;
litMember.Text = pt.memberprice.ToString("c2");
litVip.Text = pt.vipprice.ToString("c2");
}
}
}

.codearea{ color:black; background-color:white; line-height:18px; border:1px solid #4f81bd; margin:0; width:auto !important; width:100%; overflow:auto; text-align:left; font-size:12px; font-family: "Courier New","Consolas","Fixedsys","BitStream Vera Sans Mono", courier,monospace,serif}
.codearea pre{ color:black; line-height:18px; padding:0 0 0 12px !important; margin:0em; background-color:#fff !important}
.linewrap pre{white-space:pre-wrap; white-space:-moz-pre-wrap; white-space:-pre-wrap; white-space:-o-pre-wrap; word-wrap:break-word; word-break:normal}
.codearea pre.alt{ background-color:#f7f7ff !important}
.codearea .lnum{color:#4f81bd;line-height:18px}