知识大全购物车的C#实现及结算处理

Posted 2022-07-17 知

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　　本示例利用Session对象来实现一个简单的购物车主要用于教学演示

　　Book类此类主是代表购物车的一本书using System;

　　namespace CartTest /// <summary> /// Books 的摘要说明 /// </summary> public class Book string bookid; string title; decimal price; int num;

　　public Book()

　　/// <summary> /// ID /// </summary> public string BookID getreturn bookid; setbookid=value; /// <summary> /// 书名 /// </summary> public string Title getreturn title; settitle=value; /// <summary> /// 金额 /// </summary> public decimal Price getreturn price; setprice=value; sum=price*num; /// <summary> /// 数量 /// </summary> public int Num getreturn num; setnum=value; sum=price*num; decimal sum= m; //一种书的总金额 public decimal Sum getreturn sum; setsum=value;

　　//购物车集合//Books 用户所有订购的书实现IEnumerable接口我们可以将其绑定到datagrid控件using System;using System Collections;namespace CartTest /// <summary> /// /// </summary> public class Books :IEnumerable Hashtable ht=null; public Books() ht=new Hashtable();

　　public Books(int count) ht=new Hashtable(count);

　　public void Add(Book b) //如果集合中有相同ID的书则对书的数量进行相加 if(ht ContainsKey(b BookID)) ((Book)ht[b BookID]) Num=((Book)ht[b BookID]) Num+b Num; else ht Add(b BookID b);

　　public void Remove(string bookid) if(ht ContainsKey(bookid)) ht Remove(bookid); //统计有多少种书 public int Count get return ht Count;

　　public void Clear() ht Clear();

　　public Book this[string bookid] get if(ht ContainsKey(bookid)) return (Book)ht[bookid]; return null; #region IEnumerable 成员

　　public IEnumerator GetEnumerator() // TODO: 添加 Books GetEnumerator 实现 return ht Values GetEnumerator();

　　#endregion

　　//此页面主要是用于显示所有的书用的是DataList来自定义显示模板但是实际上可以使用DataGrid来处理 DataGrid也可以实现分页功能及自定义模板只要将dDatagrid设为一个模板列然后将DataList里的模板列代码Copy过去即可 //此页面中每本书都要显示封面这个问题我们可以通过一个过渡页来处理图片数据

　　<%@ Page language= c# Codebehind= BookList aspx cs AutoEventWireup= false Inherits= CartTest BookList %><!DOCTYPE HTML PUBLIC //W C//DTD HTML Transitional//EN ><HTML> <HEAD> <title>BookList</title> <meta content= Microsoft Visual Studio NET name= GENERATOR > <meta content= C# name= CODE_LANGUAGE > <meta content= javascript name= vs_defaultClientScript > <meta content= name= vs_targetSchema > <LINK text/css rel= stylesheet > </HEAD> <body MS_POSITIONING= GridLayout > <form id= Form method= post runat= server > <asp:datalist id= DataList runat= server DataKeyField= BookGuid Width= > <ItemTemplate> <TABLE id= Table cellSpacing= cellPadding= border= > <TR> <TD> <a <%# BookView aspx?BookID= +DataBinder Eval(Container DataItem BookGuid ) %> > <! imageview aspx页面专用来处理书的图片 > <asp:Image id=Image runat= server Width= px Height= px ImageUrl= <%# ImageView aspx?imgid= +DataBinder Eval(Container DataItem BookGuid ) %> > </asp:Image> </a> </TD> <TD vAlign= top > <TABLE id= Table cellSpacing= cellPadding= width= border= > <TR> <TD>书名 <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem BookTitle ) %> > </asp:Label></TD> </TR> <TR> <TD>图书简介 <asp:Label id=Label runat= server Width= Text= <%# <nobr> +DataBinder Eval(Container DataItem BookComment )+ /<nobr> %> Height= px > </asp:Label></TD> </TR> <TR> <TD>金额 <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem Price :C ) %> > </asp:Label></TD> </TR> </TABLE> </TD> </TR> <TR> <TD> <asp:Label id= Label runat= server >日期 </asp:Label> <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem PublishDate :D ) %> > </asp:Label></TD> <TD align= right > <asp:ImageButton id= Imagebutton runat= server ImageUrl= a gif CommandName= AddCart ></asp:ImageButton></TD> </TR> </TABLE> </ItemTemplate> <AlternatingItemTemplate> <TABLE id= Table cellSpacing= cellPadding= bgColor= #eefeff border= > <TR> <TD> <a <%# BookView aspx?BookID= +DataBinder Eval(Container DataItem BookGuid ) %> > <! imageview aspx页面专用来处理书的图片 > <asp:Image id=Image runat= server Width= px Height= px ImageUrl= <%# ImageView aspx?imgid= +DataBinder Eval(Container DataItem BookGuid ) %> > </asp:Image></a></TD> <TD vAlign= top > <TABLE id= Table cellSpacing= cellPadding= width= border= > <TR> <TD>书名 <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem BookTitle ) %> > </asp:Label></TD> </TR> <TR> <TD>图书简介 <asp:Label id=Label runat= server Width= px Text= <%# DataBinder Eval(Container DataItem BookComment ) %> Height= px > </asp:Label></TD> </TR> <TR> <TD>金额 <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem Price ) %> > </asp:Label></TD> </TR> </TABLE> </TD> </TR> <TR> <TD> <asp:Label id= Label runat= server >日期 </asp:Label> <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem PublishDate ) %> > </asp:Label></TD> <TD align= right > <asp:ImageButton id= Imagebutton runat= server ImageUrl= a gif ></asp:ImageButton></TD> </TR> </TABLE> </AlternatingItemTemplate> </asp:datalist></form> </body></HTML>

　　//CS CODEusing System;using System Collections;using System ComponentModel;using System Data;using System Drawing;using System Web;using System Web SessionState;using System Web UI;using System Web UI WebControls;using System Web UI HtmlControls;using System Data SqlClient;namespace CartTest /// <summary> /// BookList 的摘要说明 /// </summary> public class BookList : System Web UI Page protected System Web UI WebControls DataList DataList ; private void Page_Load(object sender System EventArgs e) if(!this IsPostBack) SqlConnection cn=new SqlConnection(); cn ConnectionString= server= ;uid=sa;pwd=;database=p ; cn Open(); SqlCommand cmd=new SqlCommand(); cmd Connection=cn; cmd CommandText= select * from books ; SqlDataAdapter da=new SqlDataAdapter(); da SelectCommand=cmd; DataSet ds=new DataSet(); da Fill(ds); cn Close(); this DataList DataSource=ds Tables[ ]; this DataBind();

　　 #endregion

　　private void DataList _ItemCommand(object source System Web UI WebControls DataListCommandEventArgs e) //用户选中一本书后默认订一本书 string bookGuid=this DataList DataKeys[e Item ItemIndex] ToString(); Book b=new Book(); //首先获得自己的购物车 Books bs=(Books)Session[ MyCart ]; b BookID=bookGuid; b Num= ; //根据ITEM的类型取值 if(e Item ItemType==ListItemType Item) b Price=Convert ToDecimal(((Label)e Item FindControl( Label )) Text Substring( )); b Title=((Label)e Item FindControl( Label )) Text; else if(e Item ItemType==ListItemType AlternatingItem) b Price=Convert ToDecimal(((Label)e Item FindControl( Label )) Text Substring( )); b Title=((Label)e Item FindControl( Label )) Text; //将书加入到购物车 bs Add(b); Session[ MyCart ]=bs; //打开购物车页面 Response Write( <script>window open( webform aspx )</script> );

　　//图片处理页using System;using System Collections;using System ComponentModel;using System Data;using System Drawing;using System Web;using System Web SessionState;using System Web UI;using System Web UI WebControls;using System Web UI HtmlControls;using System Data SqlClient;namespace CartTest /// <summary> /// ImageView 的摘要说明 /// </summary> public class ImageView : System Web UI Page private void Page_Load(object sender System EventArgs e) SqlConnection cn=new SqlConnection(); cn ConnectionString= server= ;uid=sa;pwd=;database=p ; cn Open(); SqlCommand cmd=new SqlCommand(); cmd Connection=cn; cmd CommandText= select cover from books where bookguid= + this Request QueryString[ imgid ] ToString() + ; //cmd CommandText= select cover from books where bookguid= bc a d c b e e e e ; SqlDataAdapter da=new SqlDataAdapter(); da SelectCommand=cmd; DataSet ds=new DataSet(); da Fill(ds); cn Close(); Response Clear(); Response ClearContent(); Response ContentType= Image/jpg ; Response BinaryWrite((byte[])ds Tables[ ] Rows[ ][ ]);

　　 #endregion

　　//当用户选取其中一本书时获得用户当前选中书的ID 将此ID传到具体察看页面<%@ Page language= c# Codebehind= BookView aspx cs AutoEventWireup= false Inherits= CartTest BookView %><!DOCTYPE HTML PUBLIC //W C//DTD HTML Transitional//EN ><HTML> <HEAD> <title>BookView</title> <meta name= GENERATOR Content= Microsoft Visual Studio NET > <meta name= CODE_LANGUAGE Content= C# > <meta name= vs_defaultClientScript content= javascript > <meta name= vs_targetSchema content= > </HEAD> <body MS_POSITIONING= GridLayout > <form id= Form method= post runat= server > <FONT face= 宋体 > <asp:Label id= Label runat= server Width= px Height= px ></asp:Label> <asp:Image id= Image runat= server Width= px Height= px ></asp:Image> <asp:Label id= Label runat= server Width= px ></asp:Label> <asp:Label id= Label runat= server Width= px >Label</asp:Label><asp:Panel id=Panel runat= server Height= px Width= px ></asp:Panel><asp:Label id=Label runat= server Width= px >Label</asp:Label></FONT> </form> </body></HTML>

　　namespace CartTest /// <summary> /// BookView 的摘要说明 /// </summary> public class BookView : System Web UI Page protected System Web UI WebControls Label Label ; protected System Web UI WebControls Image Image ; protected System Web UI WebControls Label Label ; protected System Web UI WebControls Label Label ; protected System Web UI WebControls TextBox TextBox ; protected System Web UI WebControls Label Label ; protected System Web UI WebControls Panel Panel ; protected System Web UI WebControls Label Label ; protected System Web UI WebControls Panel Panel ; private void Page_Load(object sender System EventArgs e) if(!this IsPostBack) if(this Request[ BookID ]!=null) this Image ImageUrl= ImageView aspx?imgid= +this Request[ BookID ] ToString(); SqlConnection cn=new SqlConnection(); cn ConnectionString= server= ;uid=sa;pwd=;database=p ; cn Open(); SqlCommand cmd=new SqlCommand(); cmd Connection=cn; cmd CommandText= select * from books where bookguid= + this Request QueryString[ BookID ] ToString() + ; //cmd CommandText= select cover from books where bookguid= bc a d c b e e e e ; SqlDataAdapter da=new SqlDataAdapter(); da SelectCommand=cmd; DataSet ds=new DataSet(); da Fill(ds); cn Close(); this Label Text=ds Tables[ ] Rows[ ][ ] ToString(); this Label Text=ds Tables[ ] Rows[ ][ ] ToString(); this Label Text=ds Tables[ ] Rows[ ][ ] ToString(); this Panel Controls Add(new LiteralControl(ds Tables[ ] Rows[ ][ ] ToString()));

　　 #endregion

　　//购物车页面实现此功能主要使用DataGrid来显示总计功能

　　<%@ Page language= c# Codebehind= WebForm aspx cs AutoEventWireup= false Inherits= CartTest WebForm %><!DOCTYPE HTML PUBLIC //W C//DTD HTML Transitional//EN ><HTML> <HEAD> <title>WebForm </title> <meta name= GENERATOR Content= Microsoft Visual Studio NET > <meta name= CODE_LANGUAGE Content= C# > <meta name= vs_defaultClientScript content= javascript > <meta name= vs_targetSchema content= > <script>//此JS主要是防止用户输入非数字 function checkNum() var chr=String fromCharCode(event keyCode); if(isNaN(chr)) event keyCode= ; </script> </HEAD> <body MS_POSITIONING= GridLayout > <form id= Form method= post runat= server > <asp:DataGrid id= DataGrid runat= server AutoGenerateColumns= False PageSize= Font Size= XX Small CellPadding= DataKeyField= BookID BorderStyle= Solid BorderColor= SkyBlue BorderWidth= px ShowFooter= True Width= px > <ItemStyle BackColor= #EEEEEE ></ItemStyle> <HeaderStyle Font Size= pt Font Bold= True BackColor= SkyBlue ></HeaderStyle> <Columns> <asp:TemplateColumn HeaderText= 书名 > <ItemTemplate> <asp:Label id=Label runat= server Text= <%# DataBinder Eval(Container DataItem Title ) %> > </asp:Label> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText= 单价 > <ItemTemplate> <asp:TextBox id=txtPrice runat= server Text= <%# DataBinder Eval(Container DataItem Price ) %> ReadOnly= True > </asp:TextBox> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText= 数量 > <ItemTemplate> <asp:TextBox id=txtNum onkeypress= checkNum() runat= server Text= <%# DataBinder Eval(Container DataItem Num ) %> > </asp:TextBox> </ItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText= 总金额 > <ItemTemplate> <asp:TextBox id=txtSum runat= server ReadOnly= True Text= <%# DataBinder Eval(Container DataItem Sum ) %> > </asp:TextBox> </ItemTemplate> <FooterTemplate> <asp:TextBox id= txtSumPrice runat= server ReadOnly= True ></asp:TextBox> </FooterTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText= 操作 > <ItemTemplate> <asp:LinkButton id= LinkButton runat= server CommandName= editBook >修改</asp:LinkButton><FONT face= 宋体 > </FONT> <asp:LinkButton id= LinkButton runat= server CommandName= delBook >删除</asp:LinkButton> </ItemTemplate> </asp:TemplateColumn> </Columns> <PagerStyle NextPageText= Font Size= pt Font Names= webdings PrevPageText= BackColor= SkyBlue ></PagerStyle> </asp:DataGrid> </form> </body></HTML>

　　//购物车察看页里的数据是Session里所存放的Books集合对象可以将其绑定到网格控件

　　using System;using System Collections;using System ComponentModel;using System Data;using System Drawing;using System Web;using System Web SessionState;using System Web UI;using System Web UI WebControls;using System Web UI HtmlControls;using System Data SqlClient;namespace CartTest /// <summary> /// WebForm 的摘要说明 /// </summary> public class WebForm : System Web UI Page protected System Web UI WebControls DataGrid DataGrid ; private void Page_Load(object sender System EventArgs e) if(!this IsPostBack) Books bs=(Books)Session[ MyCart ]; this DataGrid DataSource=bs; this DataBind();

　　#region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) // // CODEGEN: 该调用是 ASP NET Web 窗体设计器所必需的 // InitializeComponent(); base OnInit(e); /// <summary> /// 设计器支持所需的方法不要使用代码编辑器修改 /// 此方法的内容 /// </summary> private void InitializeComponent() this DataGrid ItemCreated += new System Web UI WebControls DataGridItemEventHandler(this DataGrid _ItemCreated); this DataGrid ItemCommand += new System Web UI WebControls DataGridCommandEventHandler(this DataGrid _ItemCommand); this DataGrid ItemDataBound += new System Web UI WebControls DataGridItemEventHandler(this DataGrid _ItemDataBound); this Load += new System EventHandler(this Page_Load);

　　 #endregion

　　//利用此事件对网格控件的外观进行控件（合并列） private void DataGrid _ItemCreated(object sender System Web UI WebControls DataGridItemEventArgs e) ListItemType itemType = e Item ItemType; if (itemType == ListItemType Footer) // e Item BackColor = Color SeaGreen; // e Item Font Bold = true; e Item Cells RemoveAt( ); e Item Cells RemoveAt( ); e Item Cells[ ] ColumnSpan = ; e Item Cells[ ] HorizontalAlign = HorizontalAlign Right;

　　private void DataGrid _ItemCommand(object source System Web UI WebControls DataGridCommandEventArgs e) Books bs=(Books)Session[ MyCart ]; if(e CommandName== editBook ) int num=Convert ToInt (((TextBox)e Item FindControl( txtNum )) Text); decimal p=Convert ToDecimal(((TextBox)e Item FindControl( txtPrice )) Text); bs[this DataGrid DataKeys[e Item ItemIndex] ToString()] Sum=p*num; bs[this DataGrid DataKeys[e Item ItemIndex] ToString()] Num=num; else if(e CommandName== delBook ) bs Remove(this DataGrid DataKeys[e Item ItemIndex] ToString()); this DataGrid DataSource=bs; this DataBind(); Session[ MyCart ]=bs;

　　private void DataGrid _ItemDataBound(object sender System Web UI WebControls DataGridItemEventArgs e) ListItemType itemType = e Item ItemType; if (itemType == ListItemType Footer) decimal sum= ; foreach(DataGridItem item in this DataGrid Items) decimal p=Convert ToDecimal(((TextBox) item FindControl( txtPrice )) Text); int n=Convert ToInt (((TextBox) item FindControl( txtNum )) Text); sum+=p*n; ((TextBox)e Item FindControl( txtSumPrice )) Text=sum ToString();

　　此外我们还要在Global asax CS文件中将变量进行初始化确保每个客户端访问网站时都有一个购物车当然里面是没有书的

cha138/Article/program/net/201311/11934

知识大全 购物车的C#实现及结算处理

知识大全购物车的C#实现及结算处理