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   源码介绍

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此购物车实例主要有三大功能：1.折扣方案调整 2.商品列表 3.购物车

商品列表：

购物车:

using System;
using System.Collections.Generic;
using System.Web.UI.WebControls;

public partial class Default : System.Web.UI.Page {

	public ShopCartSet ShopCart {
		get {
			return (ShopCartSet)Session["ShopCartSet"];
		}
		set {
			Session["ShopCartSet"] = value;
		}
	}

	public List<IDiscountable> DiscountsUsing {
		get {
			return (List<IDiscountable>)Application["DiscountsUsing"];
		}
	}

	protected void Page_Load(object sender, EventArgs e) {
		if (!this.IsPostBack) {
			this.SetDataBind();
			this.SetShopCartDataBind();
			this.SetDiscountDataBind();
		}
	}

	private void SetDataBind() {
		ProductBLL bllProduct = new ProductBLL();
		this.gvProducts.DataSource = bllProduct.GetAllProducts();
		this.gvProducts.DataBind();
	}

	private void SetShopCartDataBind() {
		this.gvShopCart.DataSource = this.ShopCart;
		this.gvShopCart.DataBind();
	}

	private void SetDiscountDataBind() {
		if (this.DiscountsUsing.Count > 0)
			this.lblDiscountsDescriptions.Text = "现在，您可以享受以下折扣方案：";
		this.lstDiscountsUsing.DataSource = this.DiscountsUsing;
		this.lstDiscountsUsing.DataTextField = "Description";
		this.lstDiscountsUsing.DataBind();

	}

	protected void gvProducts_RowCommand(object sender, System.Web.UI.WebControls.GridViewCommandEventArgs e) {
		int id = int.Parse((string)e.CommandArgument);
		ProductBLL bllProduct = new ProductBLL();
		Product product = bllProduct.GetProductById(id);
		ShopCartItem item = new ShopCartItem(product, 1);
		this.ShopCart.Add(item);
		this.SetShopCartDataBind();
	}

	protected void gvShopCart_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e) {
		if (e.Row.RowType == DataControlRowType.Footer) {
			e.Row.Cells[0].ColumnSpan = 3;
			e.Row.Cells[1].Visible = false;
			e.Row.Cells[2].Visible = false;
			Label lblTotalPrice = e.Row.Cells[3].FindControl("lblTotalPrice") as Label;
			lblTotalPrice.Text = string.Format("{0:F2} 元", this.ShopCart.TotalPrice);
			Label lblPrice = e.Row.Cells[4].FindControl("lblPrice") as Label;
			lblPrice.Text = string.Format("{0:F2} 元", this.ShopCart.Price);
		}
	}

	protected void gvShopCart_RowCommand(object sender, GridViewCommandEventArgs e) {
		int id = int.Parse((string)e.CommandArgument);
		ShopCartItem item = this.ShopCart[id];
		if (e.CommandName == "AddOne")
			item.Count  ;
		if (e.CommandName == "RemoveOne") {
			if (item.Count > 1) 
				item.Count--;
			else 
				this.ShopCart.Remove(item);
		}
		if (e.CommandName == "SetCount") {
			LinkButton btnSetCount = (LinkButton)e.CommandSource;
			int newCount = int.Parse(((TextBox)btnSetCount.Parent.FindControl("txtCount")).Text);
			item.Count = newCount;
		}
		if (e.CommandName == "DeleteItem")
			this.ShopCart.Remove(item);
		this.SetShopCartDataBind();
	}
}