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ASP. NET 1. Shopping Cart created with pure asp.net + cookie

Source: Internet
Author: User
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Disadvantage: Use the return button in IE even if the global cache is used
 
(1) Add Global. asax, add the following content to it, and set Global non-Cache
?
Protected void Application_BeginRequest (Object sender, EventArgs e)
{
HttpContext. Current. Response. Cache. SetNoStore ();
}
(2) create a product sales page
 
<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Default8.aspx. cs" Inherits = "Default8" %>

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div>
<Asp: DataList ID = "DataList1" runat = "server" RepeatDirection = "Horizontal" RepeatColumns = "4" AlternatingItemStyle-Wrap = "true" ItemStyle-Width = "100">
<ItemTemplate>
<Asp: Image ID = "Image2" runat = "server" ImageUrl = '<% # DataBinder. Eval (Container. DataItem, "product_pic") %>'/> <br>
<Asp: Label ID = "Label1" runat = "server" Text = '<% # DataBinder. eval (Container. dataItem, "product_name") %> '> </asp: Label> <br>
<Asp: Label ID = "Label2" runat = "server" Text = '<% # DataBinder. eval (Container. dataItem, "product_price") %> '> </asp: Label> <br>
<Asp: Label ID = "Label3" runat = "server" Visible = "false" Text = '<% # DataBinder. eval (Container. dataItem, "product_id") %> '> </asp: Label> <br>
<Asp: TextBox ID = "TextBox1" runat = "server" Width = '35' MaxLength = "3" Text = "1"> 1 </asp: textBox> & nbsp;
<Asp: LinkButton ID = "LinkButton1" runat = "server" OnCommand = "button#command" CommandName = '<% # DataBinder. eval (Container. dataItem, "product_id") %> '> purchase </asp: LinkButton>
</ItemTemplate>
</Asp: DataList> </div>
<Asp: Button ID = "Button1" runat = "server" Text = "clear shopping cart" onclick = "button#click"/>
</Form>
<P> <a href = "shopcar. aspx"> my shopping cart (up to 20 pieces of data) </a> </p>

</Body>
</Html>
 
Add code to the product sales page:
 
Using 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;

Public partial class Default8: System. Web. UI. Page
{
Database db = new database ();
HttpCookie cok = null;

Protected void Page_Load (object sender, EventArgs e)
{
If (! IsPostBack)
{
This. DataList1.DataSource = db. select_db ("select * from product_list ");
This. DataList1.DataBind (); // Convert. ToString ();
}

}
Protected void button#command (object sender, CommandEventArgs e)
{
// Number of products marked by www.2cto.com
Int num = 1;
LinkButton lb = (LinkButton) sender;
String str = lb. ClientID;
String [] str2 = str. Split ('_');
Str2 [1] = str2 [1]. Substring (3, str2 [1]. Length-3 );
Int I = int. Parse (str2 [1]);
If (TextBox) this. DataList1.Items [I]. FindControl ("TextBox1"). Text. Trim (). Length! = 0)
{
Num = int. Parse (TextBox) this. DataList1.Items [I]. FindControl ("TextBox1"). Text );
}

If (Request. Cookies ["CarInfo"] = null)
{
Cok = new HttpCookie ("CarInfo ");
Cok. Expires = DateTime. Now. AddDays (2 );
Response. AppendCookie (cok );
}

Cok = Request. Cookies ["CarInfo"];

If (cok. Values. Count> = 20)
{
Response. Write ("the shopping cart is full! ");
}

// Check whether this item exists in the shopping cart. If so, accumulate
If (cok. Values [e. CommandName] = null)
{
Cok. Values. Add (e. CommandName, num. ToString ());
}
Else
{
Cok. Values [e. CommandName] = int. Parse (cok. Values [e. CommandName]. ToString () + num + "";
}

Cok. Expires = DateTime. Now. AddDays (2 );
Response. AppendCookie (cok );

}
Protected void button#click (object sender, EventArgs e)
{
If (Request. Cookies ["CarInfo"] = null)
{
Return;
}

Cok = Request. Cookies ["CarInfo"];
Cok. Expires = DateTime. Now. AddDays (-1 );
Response. AppendCookie (cok );
}
}
 
(3) create a shopping cart page
 
<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "shopcar. aspx. cs" Inherits = "shopcar" %>

<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div> <asp: Label ID = "car_msg" runat = "server" Text = ""> </asp: Label>
</Div>
<Div>
<Asp: Repeater ID = "Repeater1" runat = "server">
<HeaderTemplate> <table border = "1"> </HeaderTemplate>
<ItemTemplate>
<Tr>
<Td> <asp: CheckBox ID = "CheckBox1" runat = "server" Checked = '<% # DataBinder. eval (Container. dataItem, "select") %> '/> </td>
<Td> <asp: Label ID = "product_id" runat = "server" Text = '<% # DataBinder. eval (Container. dataItem, "id") %> '> </asp: Label> </td>
<Td> <% # DataBinder. Eval (Container. DataItem, "name") %> </td>
<Td> <% # DataBinder. Eval (Container. DataItem, "num") %> </td>
<Td> <asp: LinkButton ID = "LinkButton1" runat = "server" CommandName = '<% # DataBinder. eval (Container. dataItem, "id") %> 'oncommand = "LinkButton2_Command"> Delete </asp: LinkButton> </td>
</Tr>
</ItemTemplate>
<FooterTemplate> </table> </FooterTemplate>
</Asp: Repeater>
</Div>
</Form>
</Body>
</Html>
 
Add code to the shopping cart page:
 
Using System;
Using System. Collections;
Using System. Configuration;
Using System. Data;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. HtmlControls;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;

Public partial class shopcar: System. Web. UI. Page
{
HttpCookie cok = null;
DataTable dt = new DataTable ();
DataTable dt2 = new DataTable ();
Database db = new database ();

Protected void Page_Load (object sender, EventArgs e)
{
This. car_msg.Text = "the shopping cart is empty ";

If (Request. Cookies ["CarInfo"]! = Null)
{
Dt2.Columns. Add ("select", typeof (bool ));
Dt2.Columns. Add ("id ");
Dt2.Columns. Add ("name ");
Dt2.Columns. Add ("num ");
Cok = Request. Cookies ["CarInfo"];

This. car_msg.Text = "Total" + Request. Cookies ["CarInfo"]. Values. Count + "" + "shopping records ";

// When you press the return key incorrectly
// Items in cok do not match
// This error occurs only when the shopping cart is deleted.
If (cok. Values [0]. Length = 0)
{
Cok. Expires = DateTime. Now. AddDays (-1 );
Response. AppendCookie (cok );
This. car_msg.Text = "the shopping cart is empty ";
This. Repeater1.DataBind ();
Return;
}

// Because the cookie does not store the product name, you need to query it once in the database.
String SQL = "select * from product_list where ";
For (int I = 0; I <cok. Values. Count-1; I ++)
{
SQL = SQL + "product_id = '" + cok. Values. Keys [I] + "' or ";
}

SQL = SQL + "product_id = '" + cok. Values. Keys [cok. Values. Count-1] + "'";

Dt = db. select_db (SQL );

// Add the query result to the new dt2 and bind it
For (int I = 0; I <cok. Values. Count; I ++)
{
Dt2.Rows. Add (false, cok. Values. Keys [I], dt. Rows [I] [1]. ToString (), cok. Values [I]);
}

// Response. Write (SQL );

This. Repeater1.DataSource = dt2;
This. Repeater1.DataBind ();
}
}
Protected void LinkButton2_Command (object sender, CommandEventArgs e)
{
If (Request. Cookies ["CarInfo"] = null)
{
Return;
}

// After the cookie is deleted, remember to delete the data in dt2.
Try
{
Cok = Request. Cookies ["CarInfo"];
Cok. Values. Remove (e. CommandName );
Response. AppendCookie (cok );
Dt2.Select ("id = '" + e. CommandName + "'") [0]. Delete ();
}
Catch
{
// Return;
}

This. Repeater1.DataSource = dt2;
This. Repeater1.DataBind ();

If (dt2.Rows. Count> 0)
{
This. car_msg.Text = "Total" + Request. Cookies ["CarInfo"]. Values. Count + "" + "shopping records ";
}
Else
{
This. car_msg.Text = "the shopping cart is empty ";
}
}
}
 


 

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