ASP.NET---ch17 線上購物、線上考試

M9153325 吳宗憲

線上購物

Main.aspx

#059: If Not Sel Is Nothing Then#060: Response.Redirect( “Buy.aspx? 類別名稱 =” _#061: & Sel.Text & "& 類別編號 =" & Sel.Value )#062: End If

Buy.aspx #107: For I = 0 To MyGrid.Items.Count - 1#108: Dim cb As CheckBox = MyGrid.Items(I).FindControl("BuyIt")#109: Dim lb As Label = MyGrid.Items(I).FindControl("ProductID")#110: Dim tb As TextBox = MyGrid.Items(I).FindControl("Quantity")#111: #112: If cb.Checked And Val(tb.Text) > 0 Then#113: If Not Hash.ContainsKey(lb.Text) Then#114: Hash.Add( lb.Text, CInt(Val(tb.Text)) )#115: Else#116: Hash(lb.Text) += CInt(Val(tb.Text))#117: End If#118: End If #119: Next

#120: Session(" 購物袋 ") = Hash#121: Response.Redirect( "List.aspx" )

List.aspx

#093: Dim X As String #094: For Each X In Hash.Keys#095: Table1.Rows.Find( X ).Item(" 數量 ") = Hash.Item(X)#096: Next#097: Table1.Columns.Add(New DataColumn(" 總價 ", GetType(Long), _#098: " 價格 * 數量 "))#099: Dim I As Integer#100: For I = 0 To Table1.Rows.Count - 1#101: 總價格 += Table1.Rows(I).Item(" 總價 ") #102: Next

Clear.aspx Hash.Clear()

HashTable 的使用1. 建立： Dim A As New HashTable2. 加入資料 : A.Add(“key”, 值 )3. 刪除單筆： A.Remove(“key”)4. 清除所有： A.Clear5. 檢查是否存在： A.ContainsKey(“key”)

線上考試

Enter.aspx #042: SQL = "Select * From 成績單 Where 學號 =“ & _#043: Number.Text & ” And 姓名 =‘“ & Name.Text & ”’“#044: Cmd = New OleDbCommand( SQL, Conn )#045: Rd = Cmd.ExecuteReader()#046: If Rd.Read() Then#047: If Rd.Item( Lesson.SelectedItem.Text ) <> ” 尚未考試“ Then#048: Msg.Text = ” 你已經考過本科目了 !“#049: Else#050: Dim URL As String#051: URL = "Test.aspx" & _#052: "? 姓名 =" & Name.Text & _#053: "& 學號 =" & Number.Text & _#054: "& 科目 =" & Lesson.SelectedItem.Text#055: Response.Redirect( URL )#056: End If#057: Else#058: Msg.Text = " 學號或姓名欄位錯誤 !"#059: End If

Test.aspx

#041: ' 列出題目#042: While Rd.Read()

#045: Dim Rlist #046: If Rd.Item(" 類型 ") = " 單選 " Then#047: RList = New RadioButtonList#048: Else#049: RList = New CheckBoxList#050: End If

#080: While Rd.Read()#081: Answer = ""#082: I = Rd.Item(" 題號 ")#083: Dim List As ListControl = MyPanel.Controls(1 + 3*(I-1))#084: If Rd.Item(" 類型 ") = " 單選 " Then#085: If Not List.SelectedItem Is Nothing Then#086: Answer = List.SelectedItem.Value#087: End If#088: Else#089: For K = 0 To List.Items.Count - 1#090: If List.Items(K).Selected Then#091: If Answer = "" Then #092: Answer = List.Items(K).Value#093: Else#094: Answer &= ", " & List.Items(K).Value#095: End If#096: End If#097: Next#098: End If#099: If Answer = Rd.Item(" 解答 ") Then Score += Rd.Item(" 分數 ")#100: End While

Test.aspx( 評分 )

Score.aspx

#052: Dim SQL = "Select * From 成績單 Where 學號 =" & Request(" 學號 ")

注意：本程式並非作為評分之用，而只是作分數的查詢，真正的分數計算及將成績寫入資料庫是利用 Test.aspx

簡報完畢敬請指教