使用 Visual Studio 进行测验
Quiz using Visual Studio
我想用 visual studio 做一个关于我的小测验。我的目标是每题有 10 个问题和 4 个选择。我试过堆叠按钮，然后在不同时间更改 10 个标签，这变得有点复杂......使用数组 or/and 循环我怎样才能提高效率？这就是我的
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.WindowState = FormWindowState.Maximized
Form1.Visible = False
Button2.Visible = False
Button3.Visible = False
Button4.Visible = False
Button5.Visible = False
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If RadioButton4.Checked = True Then
Label3.Text = "1/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "1/10" Then
Button2.Visible = True
End If
If RadioButton1.Checked = True Or RadioButton2.Checked = True Or RadioButton3.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
Button2.Text = "next"
End Sub
Private Sub Button2_click(sender As Object, e As EventArgs) Handles Button2.Click
Label1.Text = "What is Luke Lopez's favorite color?"
RadioButton4.Checked = False
RadioButton1.Text = "Purple"
RadioButton2.Text = "Burgundy"
RadioButton3.Text = "Turqoise"
RadioButton4.Text = "Brown"
If RadioButton1.Checked = True Then
Label3.Text = "2/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "2/10" Then
Button4.Visible = True
End If
If RadioButton3.Checked = True Or RadioButton2.Checked = True Or RadioButton4.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
Button2.Text = "check"
Button4.Text = "next"
If Label3.Text = "2/10" Then
Button3.Text = "next"
Button4.Text = "Check"
End If
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
Button3.Visible = False
Label1.Text = "What is Luke Lopez's shoe size?"
RadioButton1.Checked = False
RadioButton1.Text = "7"
RadioButton2.Text = "8.5"
RadioButton3.Text = "7.5"
RadioButton4.Text = "8"
Button3.Visible = False
If RadioButton2.Checked = True Then
Label3.Text = "3/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "3/10" Then
Button5.Visible = True
Button4.Visible = False
Button3.Visible = False
Button2.Visible = False
Button1.Visible = False
End If
If RadioButton1.Checked = True Or RadioButton4.Checked = True Or RadioButton3.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
End Sub
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
End Sub
这是我的前三个问题，所有按钮、标签和单选按钮都会检查和更改每次点击，但我需要它来提高效率，因为我不想在这上面浪费很多时间和计算机内存迷你项目。
您可以将问题、选项和答案保存到数据库中，然后将它们读取到数据表中，每次要显示问题时，只需使用数据表中的数据行即可。这意味着您无需编辑以下问题：
使用'Label.TextChanged' event处理'Label3.Text':
Private Sub Label3_TextChanged(sender As Object, e As EventArgs) Handles Label3.TextChanged
Select Case Label3.Text
Case "1/10"
Button2.Visible = True
Case "2/10"
Button4.Visible = True
Button3.Text = "next"
Button4.Text = "Check"
Case "3/10"
...
...
End Select
End Sub
使用'If ... Else ...'语句。例如：
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
'...
If RadioButton1.Checked = True Then
Label3.Text = "2/10"
Label4.Text = "Nice! That was Correct! Great job!"
Label4.ForeColor = Color.LimeGreen
Else
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect! Try Again!"
End If
'If RadioButton3.Checked = True Or RadioButton2.Checked = True Or RadioButton4.Checked = True Then
' Label4.ForeColor = Color.DarkRed
' Label4.Text = "Oh no! that was incorrect! Try Again!"
'End If
'...
End Sub
在评论中，我谈到了将您的数据存储在文本文件中。这就是我的文本文件的样子。每条记录都在一行中，每个字段由竖线字符 | 分隔。我选择了一个管道，因为你的问题和答案的文本中不会有任何那个字符。
1|Largest planet?|Jupiter|Venus|Saturn|Mars|1
2|Smallest planet?|Earth|Uranus|Mercury|Neptune|3
3|Comes closest to Earth?|Mars|Venus|Mercury|Jupiter|2
4|What planet is called the red planet?|Venus|Mars|Saturn|Neptune|2
5|What planet is furthest from Earth?|Saturn|Jupiter|Uranus|Neptune|4
6|How many planets in our solar system?|7|8|9|10|2
7|How many planets between Earth and Sun?|1|2|3|4|2
8|Which planet is said to have rings?|Jupiter|Uranus|Saturn|Neptune|3
您一直在使用 classes，因为 Form 是 class。 类 可以包含属性、方法和事件等。现在到class、QuestionAnswer。这些属性非常简单。 Sub New 创建 class 的新实例并使用参数设置 class.
的所有属性
在Form.Load中调用FillQuestionList。此方法使用System.IO中的File class（为此需要添加一个Imports）。 ReadAllLines returns 文件中所有行的数组。我们可以遍历这些行，然后将每一行拆分为字段。 "|" 之后的小 c 告诉编译器您打算使用 Char 而不是 String。现在我们可以调用 QuestionAnswer 的 Sub New 来提供行各部分的所有属性。然后将这个新实例添加到 QuestionList，以便我们可以在程序中使用它。
接下来，Load 事件调用 DisplayQuestion。此方法也将从 btnNext 单击事件中调用。我们从表单级变量CurrentQuestionIndex中获取我们想要显示的索引。看看 class 设置我们需要的值有多方便。循环遍历所有单选按钮，清除最后一个问题中的 Tag 并清除检查。该文件提供了正确答案的数量。这存储在单选按钮的 Tag 属性.
中
当用户单击 btnAnswer 时，我们会获取选择了哪个单选按钮并检查 Tag 属性 以查看答案是否正确。如果是，递增 Score 并显示分数。
btnNext.Click 在递增索引和显示下一个问题之前简单地检查我们是否已经到达列表的末尾。
Public Class QuestionGame
Private QuestionList As New List(Of QuestionAnswer)
Private CurrentQuestionIndex As Integer
Private Score As Integer
Private Sub QuestionGame_Load(sender As Object, e As System.EventArgs) Handles MyBase.Load
FillQuestionList()
DisplayQuestion()
End Sub
Private Sub DisplayQuestion()
Dim QA = QuestionList(CurrentQuestionIndex)
lblQuestion.Text = QA.Question
RadioButton1.Text = QA.Answer1
RadioButton2.Text = QA.Answer2
RadioButton3.Text = QA.Answer3
RadioButton4.Text = QA.Answer4
For Each rb In Controls.OfType(Of RadioButton)
rb.Tag = ""
rb.Checked = False
Next
Select Case QA.Correct
Case 1
RadioButton1.Tag = "Correct"
Case 2
RadioButton2.Tag = "Correct"
Case 3
RadioButton3.Tag = "Correct"
Case 4
RadioButton4.Tag = "Correct"
End Select
End Sub
Private Sub FillQuestionList()
Dim lines = File.ReadAllLines("C:\Users\xxxxxxxx\Questions.txt")
For Each line In lines
Dim parts = line.Split("|"c)
QuestionList.Add(New QuestionAnswer(CInt(parts(0)), parts(1), parts(2), parts(3), parts(4), parts(5), CInt(parts(6))))
Next
End Sub
Private Sub btnAnswer_Click(sender As Object, e As EventArgs) Handles btnAnswer.Click
Dim rb = Controls.OfType(Of RadioButton)().FirstOrDefault(Function(r) r.Checked = True)
If rb IsNot Nothing AndAlso rb.Tag.ToString = "Correct" Then
Score += 1
lblScore.Text = Score.ToString
MessageBox.Show("Correct!")
btnAnswer.Enabled = False 'The user can't increase his score by clicking answer several times
Else
MessageBox.Show("Sorry, wrong answer")
End If
btnNext.Enabled = True
End Sub
Private Sub btnNext_Click(sender As Object, e As EventArgs) Handles btnNext.Click
btnNext.Enabled = False 'user can't move to next question until he answers current question
If CurrentQuestionIndex = QuestionList.Count - 1 Then
MessageBox.Show("This is the last question")
Else
CurrentQuestionIndex += 1
DisplayQuestion()
End If
End Sub
End Class
Public Class QuestionAnswer
Public Property QuestionNumber As Integer
Public Property Question As String
Public Property Answer1 As String
Public Property Answer2 As String
Public Property Answer3 As String
Public Property Answer4 As String
Public Property Correct As Integer
Public Sub New(Num As Integer, Ques As String, Ans1 As String, Ans2 As String, Ans3 As String, Ans4 As String, Cor As Integer)
QuestionNumber = Num
Question = Ques
Answer1 = Ans1
Answer2 = Ans2
Answer3 = Ans3
Answer4 = Ans4
Correct = Cor
End Sub
End Class
我想用 visual studio 做一个关于我的小测验。我的目标是每题有 10 个问题和 4 个选择。我试过堆叠按钮，然后在不同时间更改 10 个标签，这变得有点复杂......使用数组 or/and 循环我怎样才能提高效率？这就是我的
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.WindowState = FormWindowState.Maximized
Form1.Visible = False
Button2.Visible = False
Button3.Visible = False
Button4.Visible = False
Button5.Visible = False
End Sub
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If RadioButton4.Checked = True Then
Label3.Text = "1/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "1/10" Then
Button2.Visible = True
End If
If RadioButton1.Checked = True Or RadioButton2.Checked = True Or RadioButton3.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
Button2.Text = "next"
End Sub
Private Sub Button2_click(sender As Object, e As EventArgs) Handles Button2.Click
Label1.Text = "What is Luke Lopez's favorite color?"
RadioButton4.Checked = False
RadioButton1.Text = "Purple"
RadioButton2.Text = "Burgundy"
RadioButton3.Text = "Turqoise"
RadioButton4.Text = "Brown"
If RadioButton1.Checked = True Then
Label3.Text = "2/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "2/10" Then
Button4.Visible = True
End If
If RadioButton3.Checked = True Or RadioButton2.Checked = True Or RadioButton4.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
Button2.Text = "check"
Button4.Text = "next"
If Label3.Text = "2/10" Then
Button3.Text = "next"
Button4.Text = "Check"
End If
End Sub
Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
Button3.Visible = False
Label1.Text = "What is Luke Lopez's shoe size?"
RadioButton1.Checked = False
RadioButton1.Text = "7"
RadioButton2.Text = "8.5"
RadioButton3.Text = "7.5"
RadioButton4.Text = "8"
Button3.Visible = False
If RadioButton2.Checked = True Then
Label3.Text = "3/10"
Label4.Text = "Nice! That was Correct!
Great job!"
Label4.ForeColor = Color.LimeGreen
End If
If Label3.Text = "3/10" Then
Button5.Visible = True
Button4.Visible = False
Button3.Visible = False
Button2.Visible = False
Button1.Visible = False
End If
If RadioButton1.Checked = True Or RadioButton4.Checked = True Or RadioButton3.Checked = True Then
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect!
Try Again!"
End If
End Sub
Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
End Sub
这是我的前三个问题，所有按钮、标签和单选按钮都会检查和更改每次点击，但我需要它来提高效率，因为我不想在这上面浪费很多时间和计算机内存迷你项目。
您可以将问题、选项和答案保存到数据库中，然后将它们读取到数据表中，每次要显示问题时，只需使用数据表中的数据行即可。这意味着您无需编辑以下问题：
使用'Label.TextChanged' event处理'Label3.Text':
Private Sub Label3_TextChanged(sender As Object, e As EventArgs) Handles Label3.TextChanged
Select Case Label3.Text
Case "1/10"
Button2.Visible = True
Case "2/10"
Button4.Visible = True
Button3.Text = "next"
Button4.Text = "Check"
Case "3/10"
...
...
End Select
End Sub
使用'If ... Else ...'语句。例如：
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
'...
If RadioButton1.Checked = True Then
Label3.Text = "2/10"
Label4.Text = "Nice! That was Correct! Great job!"
Label4.ForeColor = Color.LimeGreen
Else
Label4.ForeColor = Color.DarkRed
Label4.Text = "Oh no! that was incorrect! Try Again!"
End If
'If RadioButton3.Checked = True Or RadioButton2.Checked = True Or RadioButton4.Checked = True Then
' Label4.ForeColor = Color.DarkRed
' Label4.Text = "Oh no! that was incorrect! Try Again!"
'End If
'...
End Sub
在评论中，我谈到了将您的数据存储在文本文件中。这就是我的文本文件的样子。每条记录都在一行中，每个字段由竖线字符 | 分隔。我选择了一个管道，因为你的问题和答案的文本中不会有任何那个字符。
1|Largest planet?|Jupiter|Venus|Saturn|Mars|1
2|Smallest planet?|Earth|Uranus|Mercury|Neptune|3
3|Comes closest to Earth?|Mars|Venus|Mercury|Jupiter|2
4|What planet is called the red planet?|Venus|Mars|Saturn|Neptune|2
5|What planet is furthest from Earth?|Saturn|Jupiter|Uranus|Neptune|4
6|How many planets in our solar system?|7|8|9|10|2
7|How many planets between Earth and Sun?|1|2|3|4|2
8|Which planet is said to have rings?|Jupiter|Uranus|Saturn|Neptune|3
您一直在使用 classes，因为 Form 是 class。 类 可以包含属性、方法和事件等。现在到class、QuestionAnswer。这些属性非常简单。 Sub New 创建 class 的新实例并使用参数设置 class.
在Form.Load中调用FillQuestionList。此方法使用System.IO中的File class（为此需要添加一个Imports）。 ReadAllLines returns 文件中所有行的数组。我们可以遍历这些行，然后将每一行拆分为字段。 "|" 之后的小 c 告诉编译器您打算使用 Char 而不是 String。现在我们可以调用 QuestionAnswer 的 Sub New 来提供行各部分的所有属性。然后将这个新实例添加到 QuestionList，以便我们可以在程序中使用它。
接下来，Load 事件调用 DisplayQuestion。此方法也将从 btnNext 单击事件中调用。我们从表单级变量CurrentQuestionIndex中获取我们想要显示的索引。看看 class 设置我们需要的值有多方便。循环遍历所有单选按钮，清除最后一个问题中的 Tag 并清除检查。该文件提供了正确答案的数量。这存储在单选按钮的 Tag 属性.
当用户单击 btnAnswer 时，我们会获取选择了哪个单选按钮并检查 Tag 属性 以查看答案是否正确。如果是，递增 Score 并显示分数。
btnNext.Click 在递增索引和显示下一个问题之前简单地检查我们是否已经到达列表的末尾。
Public Class QuestionGame
Private QuestionList As New List(Of QuestionAnswer)
Private CurrentQuestionIndex As Integer
Private Score As Integer
Private Sub QuestionGame_Load(sender As Object, e As System.EventArgs) Handles MyBase.Load
FillQuestionList()
DisplayQuestion()
End Sub
Private Sub DisplayQuestion()
Dim QA = QuestionList(CurrentQuestionIndex)
lblQuestion.Text = QA.Question
RadioButton1.Text = QA.Answer1
RadioButton2.Text = QA.Answer2
RadioButton3.Text = QA.Answer3
RadioButton4.Text = QA.Answer4
For Each rb In Controls.OfType(Of RadioButton)
rb.Tag = ""
rb.Checked = False
Next
Select Case QA.Correct
Case 1
RadioButton1.Tag = "Correct"
Case 2
RadioButton2.Tag = "Correct"
Case 3
RadioButton3.Tag = "Correct"
Case 4
RadioButton4.Tag = "Correct"
End Select
End Sub
Private Sub FillQuestionList()
Dim lines = File.ReadAllLines("C:\Users\xxxxxxxx\Questions.txt")
For Each line In lines
Dim parts = line.Split("|"c)
QuestionList.Add(New QuestionAnswer(CInt(parts(0)), parts(1), parts(2), parts(3), parts(4), parts(5), CInt(parts(6))))
Next
End Sub
Private Sub btnAnswer_Click(sender As Object, e As EventArgs) Handles btnAnswer.Click
Dim rb = Controls.OfType(Of RadioButton)().FirstOrDefault(Function(r) r.Checked = True)
If rb IsNot Nothing AndAlso rb.Tag.ToString = "Correct" Then
Score += 1
lblScore.Text = Score.ToString
MessageBox.Show("Correct!")
btnAnswer.Enabled = False 'The user can't increase his score by clicking answer several times
Else
MessageBox.Show("Sorry, wrong answer")
End If
btnNext.Enabled = True
End Sub
Private Sub btnNext_Click(sender As Object, e As EventArgs) Handles btnNext.Click
btnNext.Enabled = False 'user can't move to next question until he answers current question
If CurrentQuestionIndex = QuestionList.Count - 1 Then
MessageBox.Show("This is the last question")
Else
CurrentQuestionIndex += 1
DisplayQuestion()
End If
End Sub
End Class
Public Class QuestionAnswer
Public Property QuestionNumber As Integer
Public Property Question As String
Public Property Answer1 As String
Public Property Answer2 As String
Public Property Answer3 As String
Public Property Answer4 As String
Public Property Correct As Integer
Public Sub New(Num As Integer, Ques As String, Ans1 As String, Ans2 As String, Ans3 As String, Ans4 As String, Cor As Integer)
QuestionNumber = Num
Question = Ques
Answer1 = Ans1
Answer2 = Ans2
Answer3 = Ans3
Answer4 = Ans4
Correct = Cor
End Sub
End Class