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自從我與VB混淆後,這已經快一年了,但我在第一次分配該學期時遇到了問題,該學期應該是一個複習。我應該做的是製作一個應用程序,我可以通過電子郵件輸入學生姓名,地址,GPA,年齡,以及哪個年級(新生,大二,其他)以及複選框。將陣列ID添加到標籤文本和列表框VB.NET
一旦填寫完成,我需要將這些信息預覽到label.text中。如果它看起來不錯,我需要將textbox.text信息連接到一個列表框中。無論我嘗試做什麼,或者在預覽中顯示String.Array(),或者第57行的程序崩潰,都將不勝感激。
Public Class Form1
'CIS259 Spring 2014 Matthew McQuarrie
'Declare Student Data as a String of 9 arrays
Dim StudentData(8) As String
Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
'Close application
Me.Close()
End Sub
Private Sub btnReset_Click(sender As Object, e As EventArgs) Handles btnReset.Click
'Clear entire form
txtName.Clear()
txtAddress.Clear()
txtGPA.Clear()
txtAge.Clear()
radFreshman.Checked = False
radSophomore.Checked = False
radOther.Checked = False
chkCIS.Checked = False
chkMath.Checked = False
chkScience.Checked = False
chkHistory.Checked = False
lblPreview.Text = ""
End Sub
Public Sub btnPreview_Click(sender As Object, e As EventArgs) Handles btnPreview.Click
StudentData(0) = txtName.Text
StudentData(1) = txtAddress.Text
StudentData(2) = txtGPA.Text
StudentData(3) = txtAge.Text
'Find which radio button is checked to add to StudentData
If radFreshman.Checked = True Then
StudentData(4) = "Freshman"
ElseIf radSophomore.Checked = True Then
StudentData(4) = "Sophomore"
ElseIf radOther.Checked = True Then
StudentData(4) = "Other"
End If
'Find which check boxes are checked to add to StudentData
If chkCIS.Checked = True Then
StudentData(5) = "CIS"
If chkMath.Checked = True Then
StudentData(6) = "Math"
If chkScience.Checked = True Then
StudentData(7) = "Science"
If chkHistory.Checked = True Then
StudentData(8) = "History"
End If
End If
End If
End If
'Show StudentData ino the text of lblPreview
lblPreview.Text = StudentData(0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8)
End Sub
Private Sub btnStudent_Click(sender As Object, e As EventArgs) Handles btnStudent.Click
'Add StudentData elements to Student list
lstStudents.Items.Add(StudentData(0 & 1 & 2 & 3))
End Sub
End Class
定義「程序崩潰」並定義「第57行」。什麼是例外?什麼行引發異常?發生這種情況時的價值是什麼?作爲開發環境的介紹,這是一個與調試器一起工作的非常好的機會。在您的IDE中設置一個調試斷點並逐步瀏覽代碼以觀察其運行時行爲。這應該給你很多關於發生了什麼的線索。 – David
'lblPreview.Text = StudentData(0&1&2&3&4&5&6&7&8)'這不符合你的想法。你必須單獨連接每個元素'StudenData(0)&StudentData(1)...'當它在該行(以及其他人喜歡它)拋出一個exeption時,這是一個線索,那裏有一個錯誤。 'OPTION STRICT ON'也會有所幫助 – Plutonix
感謝Plutonix你是一個拯救生命的人。現在我遇到一個問題,無論選中哪個複選框,即使未檢查,所有信息都會轉到lblPreview.Text。 –