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private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)//假设前面购买命令是一个命令名为buy的LinkButton
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{//关键,建立和加如购物车
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string pid=this.DataGrid1.DataKeys[e.Item.ItemIndex].ToString();//取出宠物编号
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if(e.CommandName=="buy")//如果命令名是 buy,说明是购买
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{
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if(Session["bus"]==null)//先就得检查购物车是否存在,如果不存在,就建立呗
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{
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System.Collections.Hashtable ht=new Hashtable();//先建立一个哈希表
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ht.Add(pid,1);//哈希表中的两个列,一个key,一个value ,我们就前面放宠物编号,后面放购买数量好了,预设置为1
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Session["bus"]=ht;//将哈希表赋值给Session对象
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}
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else//如果存在的话
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{
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Hashtable ht=(Hashtable)Session["bus"];//使用强制类型转换,再将Session["bus"]赋值给哈希表对象 ht
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if(ht[pid]==null)//如果哈希表中对应的ID没有,
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{
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ht[pid]=1;//那就直接给他设为 1
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}
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else//如果已经有对应的ID
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{
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ht[pid]=(int)ht[pid]+1;//那么就把原来的取出来再加上 1
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}
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Session["bus"]=ht;//最后再更新Session 对象
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}
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}
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}
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而读取的方法更简单了,如下:
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更新数量
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private void LinkButton1_Click(object sender, System.EventArgs e)
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{
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foreach(DataListItem dl in this.DataList1.Items)//遍历集合
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{
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TextBox tb=(TextBox)dl.FindControl("TextBox1");//找到文本框
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int newpid=Convert.ToInt32(tb.Text.ToString());//查出文本框里面的值
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Label label1=(Label)dl.FindControl("key");//找到装载哈希表key字段的那个控件
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string pid=label1.Text.ToString();//把他的值拿出来
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Hashtable ht=(Hashtable)Session["bus"];//把session["bus"]对象赋值给哈希表 ht
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int oldpid=(int)ht[pid];//求得原来的数量
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if(newpid!=oldpid)//如果文本框里的值不等于原来的数量,就用新的更换到哈希表中的值
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{
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ht[pid]=newpid;
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}
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Session["bus"]=ht;//最后再更新Session 对象
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}
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}
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