這篇文章給大家介紹c#中怎么利用Session對(duì)象實(shí)現(xiàn)一個(gè)購(gòu)物車功能,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對(duì)大家能有所幫助。
創(chuàng)新互聯(lián)基于成都重慶香港及美國(guó)等地區(qū)分布式IDC機(jī)房數(shù)據(jù)中心構(gòu)建的電信大帶寬,聯(lián)通大帶寬,移動(dòng)大帶寬,多線BGP大帶寬租用,是為眾多客戶提供專業(yè)服務(wù)器托管報(bào)價(jià),主機(jī)托管價(jià)格性價(jià)比高,為金融證券行業(yè)資陽(yáng)服務(wù)器托管,ai人工智能服務(wù)器托管提供bgp線路100M獨(dú)享,G口帶寬及機(jī)柜租用的專業(yè)成都idc公司。
//shopcart.aspx.csusing System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Text.RegularExpressions; public partial class shopCart : System.Web.UI.Page{ CommonClass ccObj = new CommonClass(); DBClass dbObj = new DBClass(); string strSql; DataTable dtTable; Hashtable hashCar; protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { if (Session["ShopCart"] == null) { //如果沒有購(gòu)物,則給出相應(yīng)信息,并隱藏按鈕 this.labMessage.Text = "您還沒有購(gòu)物!"; this.labMessage.Visible = true; //顯示提示信息 this.lnkbtnCheck.Visible = false; //隱藏“前往服務(wù)臺(tái)”按鈕 this.lnkbtnClear.Visible = false; //隱藏“清空購(gòu)物車”按鈕 this.lnkbtnContinue.Visible = false; //隱藏“繼續(xù)購(gòu)物”按鈕 } else { hashCar = (Hashtable)Session["ShopCart"]; //獲取其購(gòu)物車 if (hashCar.Count == 0) { //如果沒有購(gòu)物,則給出相應(yīng)信息,并隱藏按鈕 this.labMessage.Text = "您購(gòu)物車中沒有商品!"; this.labMessage.Visible = true; //顯示提示信息 this.lnkbtnCheck.Visible = false; //隱藏“前往服務(wù)臺(tái)”按鈕 this.lnkbtnClear.Visible = false; //隱藏“清空購(gòu)物車”按鈕 this.lnkbtnContinue.Visible = false; //隱藏“繼續(xù)購(gòu)物”按鈕 } else { //設(shè)置購(gòu)物車內(nèi)容的數(shù)據(jù)源 dtTable = new DataTable(); DataColumn column1 = new DataColumn("No"); //序號(hào)列 DataColumn column2 = new DataColumn("BookID"); //書籍ID代號(hào) DataColumn column3 = new DataColumn("BookName"); //書籍名稱 DataColumn column4 = new DataColumn("Num"); //數(shù)量 DataColumn column5 = new DataColumn("price"); //單價(jià) DataColumn column6 = new DataColumn("totalPrice");//總價(jià) dtTable.Columns.Add(column1); //添加新列 dtTable.Columns.Add(column2); dtTable.Columns.Add(column3); dtTable.Columns.Add(column4); dtTable.Columns.Add(column5); dtTable.Columns.Add(column6); DataRow row; //對(duì)數(shù)據(jù)表中每一行進(jìn)行遍歷,給每一行的新列賦值 //foreach (object key in hashCar.Keys) //{ // row = dtTable.NewRow(); // row["BookID"] = key.ToString(); // row["Num"] = hashCar[key].ToString(); // dtTable.Rows.Add(row); //} foreach (DictionaryEntry hash in hashCar) { row = dtTable.NewRow(); row["BookID"] = hash.Key.ToString(); row["Num"] = hash.Value.ToString(); dtTable.Rows.Add(row); } //計(jì)算價(jià)格 DataTable dstable; int i = 1; float price;//商品單價(jià) int count; //商品數(shù)量 float totalPrice = 0; //商品總價(jià)格 foreach (DataRow drRow in dtTable.Rows) { strSql = "select BookName,HotPrice from tb_BookInfo where BookID=" + Convert.ToInt32(drRow["BookID"].ToString()); dstable = dbObj.GetDataSetStr(strSql, "tbGI"); drRow["No"] = i;//序號(hào) drRow["BookName"] = dstable.Rows[0][0].ToString();//書籍名稱 drRow["price"] = (dstable.Rows[0][1].ToString());//單價(jià) price = float.Parse(dstable.Rows[0][1].ToString());//單價(jià) count = Int32.Parse(drRow["Num"].ToString()); drRow["totalPrice"] = price * count; //總價(jià) totalPrice += price * count; //計(jì)算合價(jià) i++; } this.labTotalPrice.Text = "總價(jià):" + totalPrice.ToString(); //顯示所有商品的價(jià)格 this.gvShopCart.DataSource = dtTable.DefaultView; //綁定GridView控件 this.gvShopCart.DataKeyNames = new string[] { "BookID" }; this.gvShopCart.DataBind(); } } } } public void bind() { if (Session["ShopCart"] == null) { //如果沒有購(gòu)物,則給出相應(yīng)信息,并隱藏按鈕 this.labMessage.Text = "您還沒有購(gòu)物!"; this.labMessage.Visible = true; //顯示提示信息 this.lnkbtnCheck.Visible = false; //隱藏“前往服務(wù)臺(tái)”按鈕 this.lnkbtnClear.Visible = false; //隱藏“清空購(gòu)物車”按鈕 this.lnkbtnContinue.Visible = false; //隱藏“繼續(xù)購(gòu)物”按鈕 } else { hashCar = (Hashtable)Session["ShopCart"]; //獲取其購(gòu)物車 if (hashCar.Count == 0) { //如果沒有購(gòu)物,則給出相應(yīng)信息,并隱藏按鈕 this.labMessage.Text = "您購(gòu)物車中沒有商品!"; this.labMessage.Visible = true; //顯示提示信息 this.lnkbtnCheck.Visible = false; //隱藏“前往服務(wù)臺(tái)”按鈕 this.lnkbtnClear.Visible = false; //隱藏“清空購(gòu)物車”按鈕 this.lnkbtnContinue.Visible = false; //隱藏“繼續(xù)購(gòu)物”按鈕 } else { //設(shè)置購(gòu)物車內(nèi)容的數(shù)據(jù)源 dtTable = new DataTable(); DataColumn column1 = new DataColumn("No"); //序號(hào)列 DataColumn column2 = new DataColumn("BookID"); //書籍ID代號(hào) DataColumn column3 = new DataColumn("BookName"); //書籍名稱 DataColumn column4 = new DataColumn("Num"); //數(shù)量 DataColumn column5 = new DataColumn("price"); //單價(jià) DataColumn column6 = new DataColumn("totalPrice");//總價(jià) dtTable.Columns.Add(column1); //添加新列 dtTable.Columns.Add(column2); dtTable.Columns.Add(column3); dtTable.Columns.Add(column4); dtTable.Columns.Add(column5); dtTable.Columns.Add(column6); DataRow row; //對(duì)數(shù)據(jù)表中每一行進(jìn)行遍歷,給每一行的新列賦值 foreach (object key in hashCar.Keys) { row = dtTable.NewRow(); row["BookID"] = key.ToString(); row["Num"] = hashCar[key].ToString(); dtTable.Rows.Add(row); } //計(jì)算價(jià)格 DataTable dstable; int i = 1; float price;//商品單價(jià) int count; //商品數(shù)量 float totalPrice = 0; //商品總價(jià)格 foreach (DataRow drRow in dtTable.Rows) { strSql = "select BookName,HotPrice from tb_BookInfo where BookID=" + Convert.ToInt32(drRow["BookID"].ToString()); dstable = dbObj.GetDataSetStr(strSql, "tbGI"); drRow["No"] = i;//序號(hào) drRow["BookName"] = dstable.Rows[0][0].ToString();//書籍名稱 drRow["price"] = (dstable.Rows[0][1].ToString());//單價(jià) price = float.Parse(dstable.Rows[0][1].ToString());//單價(jià) count = Int32.Parse(drRow["Num"].ToString()); drRow["totalPrice"] = price * count; //總價(jià) totalPrice += price * count; //計(jì)算合價(jià) i++; } this.labTotalPrice.Text = "總價(jià):" + totalPrice.ToString(); //顯示所有商品的價(jià)格 this.gvShopCart.DataSource = dtTable.DefaultView; //綁定GridView控件 this.gvShopCart.DataKeyNames=new string[] {"BookID"}; this.gvShopCart.DataBind(); } } } protected void lnkbtnUpdate_Click(object sender, EventArgs e) { hashCar = (Hashtable)Session["ShopCart"]; //獲取其購(gòu)物車 //使用foreach語(yǔ)句,遍歷更新購(gòu)物車中的商品數(shù)量 foreach (GridViewRow gvr in this.gvShopCart.Rows) { TextBox otb = (TextBox)gvr.FindControl("txtNum"); //找到用來輸入數(shù)量的TextBox控件 int count = Int32.Parse(otb.Text);//獲得用戶輸入的數(shù)量值 string BookID = gvr.Cells[1].Text;//得到該商品的ID代 hashCar[BookID] = count;//更新hashTable表 } Session["ShopCart"] = hashCar;//更新購(gòu)物車 Response.Redirect("shopCart.aspx"); } protected void lnkbtnDelete_Command(object sender, CommandEventArgs e) { hashCar = (Hashtable)Session["ShopCart"];//獲取其購(gòu)物車 //從Hashtable表中,將指定的商品從購(gòu)物車中移除,其中,刪除按鈕(lnkbtnDelete)的CommandArgument參數(shù)值為商品ID代號(hào) hashCar.Remove(e.CommandArgument); Session["ShopCart"] = hashCar; //更新購(gòu)物車 Response.Redirect("shopCart.aspx"); } protected void lnkbtnClear_Click(object sender, EventArgs e) { Session["ShopCart"] =null; Response.Redirect("shopCart.aspx"); } protected void lnkbtnContinue_Click(object sender, EventArgs e) { Response.Redirect("Default.aspx"); } protected void lnkbtnCheck_Click(object sender, EventArgs e) { Response.Redirect("checkOut.aspx"); } protected void gvShopCart_PageIndexChanging(object sender, GridViewPageEventArgs e) { gvShopCart.PageIndex = e.NewPageIndex; bind(); } protected void txtNum_TextChanged(object sender, EventArgs e) { hashCar = (Hashtable)Session["ShopCart"]; //獲取其購(gòu)物車 foreach (GridViewRow gvr in this.gvShopCart.Rows) { TextBox otb = (TextBox)gvr.FindControl("txtNum"); //找到用來輸入數(shù)量的TextBox控件 int count = Int32.Parse(otb.Text);//獲得用戶輸入的數(shù)量值 string BookID = gvr.Cells[1].Text;//得到該商品的ID代 hashCar[BookID] = count;//更新hashTable表 } Session["ShopCart"] = hashCar;//更新購(gòu)物車 bind(); }
//shopcart.aspx <table cellSpacing="0" cellPadding="0" width="95%" align="center" border="0" > <tr> <td align="center"> <asp:Label ID="labMessage" runat="server" Visible="False"></asp:Label></td> </tr> <tr> <td align="left" height =30px> <asp:Label ID="labTotalPrice" runat="server" Text="0.00 " ></asp:Label>¥</td> </tr> <tr style =" font :9pt; font-family :宋體;" valign =top > <td align="left" > <asp:GridView ID="gvShopCart" DataKeyNames ="BookID" runat="server" AutoGenerateColumns="False" AllowPaging="True" OnPageIndexChanging="gvShopCart_PageIndexChanging" > <Columns> <asp:BoundField DataField="No" HeaderText="序號(hào)" ReadOnly="True"> <ItemStyle HorizontalAlign="Center" /> <HeaderStyle HorizontalAlign="Center" /> </asp:BoundField> <asp:BoundField DataField="BookID" HeaderText="書籍ID" ReadOnly="True"> <ItemStyle HorizontalAlign="Center" /> <HeaderStyle HorizontalAlign="Center" /> </asp:BoundField> <asp:BoundField DataField="BookName" HeaderText="書籍名稱" ReadOnly="True"> <ItemStyle HorizontalAlign="Center" /> <HeaderStyle HorizontalAlign="Center" /> </asp:BoundField> <asp:TemplateField HeaderText="數(shù)量"> <ItemTemplate > <asp:TextBox ID="txtNum" runat="server" Text =<%#Eval("Num") %> Width =60px OnTextChanged="txtNum_TextChanged"></asp:TextBox> <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtNum" ErrorMessage="×" ValidationExpression="^\+?[1-9][0-9]*$"></asp:RegularExpressionValidator> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText =單價(jià)> <HeaderStyle HorizontalAlign=Center /> <ItemStyle HorizontalAlign =Center /> <ItemTemplate > <%#Eval("price")%>¥ </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText =總價(jià)> <HeaderStyle HorizontalAlign=Center /> <ItemStyle HorizontalAlign =Center /> <ItemTemplate > <%#Eval("totalPrice")%>¥ </ItemTemplate> </asp:TemplateField> <asp:TemplateField> <HeaderStyle HorizontalAlign=Center /> <ItemStyle HorizontalAlign =Center /> <ItemTemplate > <asp:LinkButton ID="lnkbtnDelete" runat="server" CommandArgument ='<%#Eval("BookID") %>' OnCommand ="lnkbtnDelete_Command">刪除</asp:LinkButton> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> </td> </tr> <tr align =left valign =top > <td align="center" > <asp:LinkButton ID="lnkbtnUpdate" runat="server" OnClick="lnkbtnUpdate_Click">更新購(gòu)物車</asp:LinkButton> <asp:LinkButton ID="lnkbtnClear" runat="server" OnClick="lnkbtnClear_Click" >清空購(gòu)物車</asp:LinkButton> <asp:LinkButton ID="lnkbtnContinue" runat="server" OnClick="lnkbtnContinue_Click" >繼續(xù)購(gòu)物</asp:LinkButton> <asp:LinkButton ID="lnkbtnCheck" runat="server" OnClick="lnkbtnCheck_Click" >前往服務(wù)臺(tái)</asp:LinkButton> </td> </tr> <tr> <td align="left" > <br /> <li>如果要修改商品數(shù)量,請(qǐng)單擊“更新購(gòu)物車”按鈕 </li><li>如果要取消某個(gè)商品,請(qǐng)單擊“刪除” <br /> </li> </td> </tr> </table>
Default.aspx.cs //添加物品到購(gòu)物車代碼 protected void dlDiscount_ItemCommand(object source, DataListCommandEventArgs e) { if (e.CommandName == "detailSee") { AddressBack(e); } else if (e.CommandName == "buy") { AddShopCart(e); } } protected void dlHot_ItemCommand(object source, DataListCommandEventArgs e) { if (e.CommandName == "detailSee") { AddressBack(e); } else if (e.CommandName == "buy") { AddShopCart(e); } } /// <summary> /// 向購(gòu)物車中添加新商品 /// </summary> /// <param name="e"> /// 獲取或設(shè)置可選參數(shù), /// 該參數(shù)與關(guān)聯(lián)的 CommandName /// 一起被傳遞到 Command 事件。 /// </param> public void AddShopCart(DataListCommandEventArgs e) { Hashtable hashCar; if (Session["ShopCart"] == null) { //如果用戶沒有分配購(gòu)物車 hashCar = new Hashtable(); //新生成一個(gè) hashCar.Add(e.CommandArgument, 1); //添加一個(gè)商品 Session["ShopCart"] = hashCar; //分配給用戶 } else { //用戶已經(jīng)有購(gòu)物車 hashCar = (Hashtable)Session["ShopCart"];//得到購(gòu)物車的hash表 if (hashCar.Contains(e.CommandArgument))//購(gòu)物車中已有此商品,商品數(shù)量加1 { int count = Convert.ToInt32(hashCar[e.CommandArgument].ToString());//得到該商品的數(shù)量 hashCar[e.CommandArgument] = (count + 1);//商品數(shù)量加1 } else hashCar.Add(e.CommandArgument, 1);//如果沒有此商品,則新添加一個(gè)項(xiàng) } }this.ClientScript.RegisterStartupScript(this.GetType(),"",<script>alert("商品添加成功!")</script>);
HashTable實(shí)現(xiàn)購(gòu)物車,先前我們的購(gòu)物車使用的是數(shù)據(jù)庫(kù)方式實(shí)現(xiàn),每次購(gòu)物都要進(jìn)行數(shù)據(jù)庫(kù)操作,很影響效率。現(xiàn)在我們采用HashTable和Session來實(shí)現(xiàn)購(gòu)物車,這樣便節(jié)省了數(shù)據(jù)庫(kù)的操作,大大的提高效率
private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)//假設(shè)前面購(gòu)買命令是一個(gè)命令名為buy的LinkButton{//關(guān)鍵,建立和加如購(gòu)物車string pid=this.DataGrid1.DataKeys[e.Item.ItemIndex].ToString();//取出編號(hào)if(e.CommandName=="buy")//如果命令名是 buy,說明是購(gòu)買{if(Session["bus"]==null)//先就得檢查購(gòu)物車是否存在,如果不存在,就建立 {System.Collections.Hashtable ht=new Hashtable();//先建立一個(gè)哈希表ht.Add(pid,1);//哈希表中的兩個(gè)列,一個(gè)key,一個(gè)value ,key放編號(hào),value放購(gòu)買數(shù)量好了,預(yù)設(shè)置為1Session["bus"]=ht;//將哈希表賦值給Session對(duì)象}else//如果存在的話{Hashtable ht=(Hashtable)Session["bus"];//使用強(qiáng)制類型轉(zhuǎn)換,再將Session["bus"]賦值給哈希表對(duì)象 htif(ht[pid]==null)//如果哈希表中對(duì)應(yīng)的ID沒有,{ht[pid]=1;//那就直接給他設(shè)為?。眪else//如果已經(jīng)有對(duì)應(yīng)的ID{ht[pid]=(int)ht[pid]+1;//那么就把原來的取出來再加上?。眪Session["bus"]=ht;//最后再更新Session 對(duì)象}} }
而讀取的方法如下:
this.DataList1.DataSource=(Hashtable)Session["bus"];this.DataList1.DataBind();1private void LinkButton1_Click(object sender, System.EventArgs e){ foreach(DataListItem dl in this.DataList1.Items)//遍歷集合{TextBox tb=(TextBox)dl.FindControl("TextBox1");//找到文本框int newpid=Convert.ToInt32(tb.Text.ToString());//查出文本框里面的值 Label label1=(Label)dl.FindControl("key");//找到裝載哈希表key字段的那個(gè)控件string pid=label1.Text.ToString();//把他的值拿出來 Hashtable ht=(Hashtable)Session["bus"];//把session["bus"]對(duì)象賦值給哈希表 htint oldpid=(int)ht[pid];//求得原來的數(shù)量 if(newpid!=oldpid)//如果文本框里的值不等于原來的數(shù)量,就用新的更換到哈希表中的值{ht[pid]=newpid;}Session["bus"]=ht;//最后再更新Session 對(duì)象}}
關(guān)于c#中怎么利用Session對(duì)象實(shí)現(xiàn)一個(gè)購(gòu)物車功能就分享到這里了,希望以上內(nèi)容可以對(duì)大家有一定的幫助,可以學(xué)到更多知識(shí)。如果覺得文章不錯(cuò),可以把它分享出去讓更多的人看到。
分享名稱:c#中怎么利用Session對(duì)象實(shí)現(xiàn)一個(gè)購(gòu)物車功能
標(biāo)題路徑:http://muchs.cn/article40/ihcgho.html
成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián),為您提供標(biāo)簽優(yōu)化、網(wǎng)站設(shè)計(jì)、網(wǎng)站制作、Google、電子商務(wù)、自適應(yīng)網(wǎng)站
聲明:本網(wǎng)站發(fā)布的內(nèi)容(圖片、視頻和文字)以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主,如果涉及侵權(quán)請(qǐng)盡快告知,我們將會(huì)在第一時(shí)間刪除。文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如需處理請(qǐng)聯(lián)系客服。電話:028-86922220;郵箱:631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載,或轉(zhuǎn)載時(shí)需注明來源: 創(chuàng)新互聯(lián)