一、 將test數據庫附加到數據庫管理系統中；數據庫中的book_info包含下列數據：html
二、 新建一個網站，將images文件夾複製到網站中；
三、 在Default.aspx中，經過DataList控件展現數據庫中的全部數據，以行爲主序，每行3列，單擊購買按鈕時，將商品的ID和數量保存到HashTable中，並將HashTable放置到Session中。sql
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protected
void
DataList1_ItemCommand(
object
source, DataListCommandEventArgs e)
{
string
id = e.CommandArgument.ToString();
Hashtable ht;
if
(Session[
"shopcar"
] ==
null
)
{
ht =
new
Hashtable();
ht.Add(id, 1);
Session[
"shopcar"
] = ht;
}
else
{
ht = (Hashtable)Session[
"shopcar"
];
if
(ht.Contains(id))
{
int
count =
int
.Parse(ht[id].ToString());
ht[id] = count + 1;
Session[
"shopcar"
] = ht;
Response.Write(count + 1);
}
else
{
ht.Add(id, 1);
Session[
"shopcar"
] = ht;
}
}
}
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四、 在Default.aspx中添加一個超連接，連接到shopcart.aspx,在shopcart.aspx中顯示用戶購買的商品信息。
提示：數據庫
A、在shopcart中先定義下列變量：
session
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Hashtable ht;
DataTable dt;
string
connstring=
@"DataSource=.\SQLEXPRESS;Initial Catalog=test;Integrated Security=True"
;
SqlConnection conn;
SqlCommand cmd;
SqlDataReader sdr;
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B、頁面中添加一個GridView。
C、在page_load中，將dt實例化，創建各列。
asp.net
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protected void Page_Load(object sender, EventArgs e)
{
dt = new DataTable();
DataColumn col = new DataColumn();
col.ColumnName= "id";
col.DataType =System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "name";
col.DataType =System.Type.GetType("System.String");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "Num";
col.DataType =System.Type.GetType("System.Int32");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "price";
col.DataType =System.Type.GetType("System.Single");
dt.Columns.Add(col);
col = new DataColumn();
col.ColumnName= "Total";
col.DataType =System.Type.GetType("System.Single");
dt.Columns.Add(col);
if (!IsPostBack)
{
Bind();
}
}
public void Bind()
{
if (Session["shopcar"] == null)
{
Response.Write("<
script
>if(confirm('你沒有登陸')window.location='Default15.aspx';else window.close();</
script
>");
}
else
{
ht = (Hashtable)Session["shopcar"];
foreach (object item in ht.Keys)
{
string id = item.ToString();
int num = int.Parse(ht[item].ToString());
string sql = "selectbook_name,price from book_info where book_id='" + id + "'";
conn = new SqlConnection(connstring);
cmd = new SqlCommand(sql, conn);
conn.Open();
sdr =cmd.ExecuteReader();
if (sdr.HasRows)
{
sdr.Read();
DataRow row = dt.NewRow();
row["id"] = id;
row["Num"] = num;
row["name"] = sdr.GetString(0);
row["price"] =float.Parse(sdr[1].ToString());
row["total"] =num*(float.Parse(sdr[1].ToString()));
dt.Rows.Add(row);
}
sdr.Close();
conn.Close();
}
GridView1.DataSource = dt.DefaultView;
GridView1.DataBind();
}
}
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D、這時能夠看到用戶購買的商品，但不能修改數量，也不能刪除。
E、添加修改數量，刪除商品功能，在aspx頁面中定義GridView中的各列：
網站
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<asp:GridView ID=
"GridView1"
runat=
"server"
AutoGenerateColumns=
"False"
>
<Columns>
<asp:BoundField DataField=
"id"
HeaderText=
"ID"
/>
<asp:BoundField DataField=
"name"
HeaderText=
"名稱"
/>
<asp:BoundField DataField=
"price"
HeaderText=
"價格"
/>
<asp:TemplateField>
<ItemTemplate>
<asp:TextBox runat=
"server"
ID=
"textbox1"
Text=
'<%# Eval("Num") %>'
ontextchanged=
"textbox1_TextChanged"
AutoPostBack=
"True"
></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField=
"total"
HeaderText=
"總計"
/>
<asp:TemplateField>
<ItemTemplate>
<asp:Button runat=
"server"
ID=
"button1"
CommandArgument=
'<%# Eval("id") %>'
Text=
"刪除"
onclick=
"button1_Click"
/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
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F、爲GridView中的文本框添加TextChanged事件：
spa
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protected
void
textbox1_TextChanged(
object
sender, EventArgs e)
{
Hashtable ht =(Hashtable)Session[
"shopcar"
];
if
(ht ==
null
)
return
;
for
(
int
i = 0; i < GridView1.Rows.Count;i++)
{
string
id =GridView1.Rows[i].Cells[0].Text.ToString();
Response.Write(id);
string
num = ((TextBox)GridView1.Rows[i].FindControl(
"textbox1"
)).Text;
Response.Write(
" "
+num+
"<br />"
);
ht[id] = num;
}
Session[
"shopcar"
] = ht;
Bind();
}
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G、爲按鈕添加單擊事件：
.net
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protected
void
button1_Click(
object
sender, EventArgs e)
{
string
id = ((Button)sender).CommandArgument;
Hashtable ht = (Hashtable)Session[
"shopcar"
];
if
(ht ==
null
)
return
;
ht.Remove(id);
Bind();
}
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購物車代碼：showcart.aspx.cs
code
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using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Web;
using
System.Web.UI;
using
System.Web.UI.WebControls;
using
System.Collections;
using
System.Data;
using
System.Data.SqlClient;
public
partial
class
shopcart : System.Web.UI.Page
{
Hashtable ht;
DataTable dt;
string
connstr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=F:
\\test.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";
SqlConnection conn;
SqlCommand cmd;
SqlDataReader sdr;
protected
void
Page_Load(
object
sender, EventArgs e)
{
dt =
new
DataTable();
DataColumn col =
new
DataColumn();
col.ColumnName =
"id"
;
col.DataType = System.Type.GetType(
"System.String"
);
dt.Columns.Add(col);
col =
new
DataColumn();
col.ColumnName =
"name"
;
col.DataType = System.Type.GetType(
"System.String"
);
dt.Columns.Add(col);
col =
new
DataColumn();
col.ColumnName =
"Num"
;
col.DataType = System.Type.GetType(
"System.Int32"
);
dt.Columns.Add(col);
col =
new
DataColumn();
col.ColumnName =
"price"
;
col.DataType = System.Type.GetType(
"System.Single"
);
dt.Columns.Add(col);
col =
new
DataColumn();
col.ColumnName =
"Total"
;
col.DataType = System.Type.GetType(
"System.Single"
);
dt.Columns.Add(col);
if
(!IsPostBack)
{
Bind();
}
}
public
void
Bind()
{
if
(Session[
"shopcar"
] ==
null
)
{
Response.Write(
"<script>if(confirm('你沒有登陸')window.location='Default.aspx';else window.close();</script>"
);
}
else
{
ht = (Hashtable)Session[
"shopcar"
];
foreach
(
object
item
in
ht.Keys)
{
string
id = item.ToString();
int
num =
int
.Parse((ht[item].ToString()));
string
sql =
"select book_name,price from book_info where book_id='"
+ id +
"'"
;
conn =
new
SqlConnection(connstr);
cmd =
new
SqlCommand(sql, conn);
conn.Open();
sdr = cmd.ExecuteReader();
if
(sdr.HasRows)
{
sdr.Read();
DataRow row = dt.NewRow();
row[
"id"
] = id;
row[
"Num"
] = num;
row[
"name"
] = sdr.GetString(0);
row[
"price"
] =
float
.Parse(sdr[1].ToString());
row[
"total"
] = num * (
float
.Parse(sdr[1].ToString()));
dt.Rows.Add(row);
}
sdr.Close();
conn.Close();
}
}
GridView1.DataSource = dt.DefaultView;
GridView1.DataBind();
}
protected
void
textbox1_TextChanged(
object
sender, EventArgs e)
{
Hashtable ht = (Hashtable)Session[
"shopcar"
];
if
(ht ==
null
)
return
;
for
(
int
i = 0; i < GridView1.Rows.Count; i++)
{
string
id = GridView1.Rows[i].Cells[0].Text.ToString();
Response.Write(id);
string
num = ((TextBox)GridView1.Rows[i].FindControl(
"textbox1"
)).Text;
Response.Write(
" "
+ num +
"<br />"
);
ht[id] = num;
}
Session[
"shopcar"
] = ht;
Bind();
}
protected
void
button1_Click(
object
sender, EventArgs e)
{
string
id = ((Button)sender).CommandArgument;
Hashtable ht = (Hashtable)Session[
"shopcar"
];
if
(ht ==
null
)
return
;
ht.Remove(id);
Bind();
}
}
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製做一個簡單的購物車就是這麼簡單，你們能夠按照個人思路進行創做，在此基礎上在添加一些功能。server