不区分大小写 [英] Case insensitive

问题描述

If TextBox2.Text = "a" AndAlso TextBox21.Text = "a" Then
        'MessageBox.Show("A")
        totCorrect = totCorrect + corAns
    ElseIf TextBox2.Text = "b" AndAlso TextBox21.Text = "b" Then
        'MessageBox.Show("B")
        totCorrect = totCorrect + corAns
    ElseIf TextBox2.Text = "c" AndAlso TextBox21.Text = "c" Then
        'MessageBox.Show("C")
        totCorrect = totCorrect + corAns
    ElseIf TextBox2.Text = "d" AndAlso TextBox21.Text = "d" Then
        'MessageBox.Show("D")
        totCorrect = totCorrect + corAns
    Else
        totWrong = totWrong + wrgAns
        Label13.Visible = True
    End If

我正在尝试使字母a，b，c ，d用户输入不敏感。尝试使用UCase，但无法正常工作（不确定我是否使用错误）。我在Visual Studio 2012中并使用VB。任何引用都很好。

I am trying to make the letters a,b,c,d that the user enters insensitive. Tried to use the UCase, but it did not work (not sure if I am using it wrong). I am in Visual Studio 2012 and using VB. Any references would be great.

推荐答案

您可以使用 String.Compare 方法： String.Compare（字符串strA，字符串strB，布尔值ignoreCase ）

通过 ignoreCase 参数传递 true 将执行不区分大小写的比较。

Pass ignoreCase argument with true will perform case insensitive comparison.

If String.Compare(TextBox2.Text, "a", true) = 0 AndAlso String.Compare(TextBox21.Text, "a", true) = 0 Then
        'MessageBox.Show("A")
        totCorrect = totCorrect + corAns
    ElseIf String.Compare(TextBox2.Text, "b", true) = 0 AndAlso String.Compare(TextBox21.Text, "b", true) = 0 Then
        'MessageBox.Show("B")
        totCorrect = totCorrect + corAns
    ElseIf String.Compare(TextBox2.Text, "c", true) = 0 AndAlso String.Compare(TextBox21.Text, "c", true) = 0 Then
        'MessageBox.Show("C")
        totCorrect = totCorrect + corAns
    ElseIf String.Compare(TextBox2.Text, "d", true) = 0 AndAlso String.Compare(TextBox21.Text, "d", true) = 0 Then
        'MessageBox.Show("D")
        totCorrect = totCorrect + corAns
    Else
        totWrong = totWrong + wrgAns
        Label13.Visible = True
    End If

另一个想法是使用 ToUpper 或 ToLower 。

If TextBox2.Text.ToUpper() = "A" AndAlso TextBox21.Text.ToUpper() = "A" Then
            'MessageBox.Show("A")
            totCorrect = totCorrect + corAns
        ElseIf TextBox2.Text.ToUpper() = "B" AndAlso TextBox21.Text.ToUpper() = "B" Then
            'MessageBox.Show("B")
            totCorrect = totCorrect + corAns
        ElseIf TextBox2.Text.ToUpper() = "C" AndAlso TextBox21.Text.ToUpper() = "C" Then
            'MessageBox.Show("C")
            totCorrect = totCorrect + corAns
        ElseIf TextBox2.Text.ToUpper() = "D" AndAlso TextBox21.Text.ToUpper() = "D" Then
            'MessageBox.Show("D")
            totCorrect = totCorrect + corAns
        Else
            totWrong = totWrong + wrgAns
            Label13.Visible = True
        End If

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