曾经为没有vb.net版支付宝接口程序郁闷过很长一段时间，终于忍不住修改 了一下
其主要的3个文件修改为vb.net很容易，直接给出：alipay.rar
下面是接口代码的参数说明：
Private Sub ImageButton1_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
' '按时构造订单号
Dim currentTime As System.DateTime = New System.DateTime
currentTime = System.DateTime.Now
Dim out_trade_no As String
out_trade_no = currentTime.ToString("g")
out_trade_no = out_trade_no.Replace("-", "")
out_trade_no = out_trade_no.Replace(":", "")
out_trade_no = out_trade_no.Replace(" ", "")
'业务参数赋值
Dim gateway As String = "https://www.alipay.com/cooperate/gateway.do?" '支付接口
Dim service As String = "trade_create_by_buyer" '服务参数
Dim sign_type As String = "MD5"
Dim subject, body As String
body = ""
sql = "select cp_name from chanpin where cp_id="& cint(label2.text)
getdata.myconn.Open()
reader = getdata.getdatareader(sql)
While reader.Read
subject = reader.Item(0) '商品名称
body = body & " " & reader.Item(0) '商品描述 ,不能有太多字符
End While
reader.Close()
Dim quantity As String
quantity = "1" '商品数量
Dim payment_type As String
payment_type = "1" '支付类型'1=商品购买，2=服务购买，3=网络拍卖，4=捐赠，5=邮费补偿，6=奖金
Dim price As String
sql = "select cp_money from chanpin where cp_id="& cint(label1.text)
reader = getdata.getdatareader(sql)
If reader.Read Then
price = reader.Item(0) '商品价格
End If
reader.Close()
getdata.myconn.Close()
Dim show_url, seller_email, key, partner As String
show_url = "http://****" '商品描述地址
seller_email = *** '您的支付宝认证Email,必须通过支付宝认证才可以
key = *** '安全校验码,在支付宝网站“商家工具”那里可以获得
partner = *** 'partner合作伙伴ID
Dim return_url As String = "Alipay_Return.aspx" '服务器通知返回接口
Dim notify_url As String = "Alipay_Notify.aspx" '服务器通知接口
Dim _input_charset As String = "utf-8" '服务器编码
Dim logistics_type As String = "POST"
Dim logistics_fee As String = "0" '平邮费 包含在价格中
Dim logistics_fee_1 As String = "0" '快递费 包含在价格中
Dim logistics_payment As String = "BUYER_PAY"
Dim logistics_type_1 As String = "EXPRESS"
Dim logistics_payment_1 As String = "BUYER_PAY"
Dim ap As AliPay = New AliPay
Dim aliay_url As String = ap.CreatUrl(gateway, service, partner, sign_type, out_trade_no, subject, body, payment_type, price, show_url, seller_email, key, return_url, _input_charset, notify_url, logistics_type, logistics_fee, logistics_payment, logistics_type_1, logistics_fee_1, logistics_payment_1, quantity)
Response.Redirect(aliay_url)
End Sub
