vb.net 不区分大小写
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Case insensitive
提问by Brandon
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
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.
我试图让用户输入的字母 a,b,c,d 不敏感。尝试使用 UCase，但它不起作用（不确定我是否使用错误）。我在 Visual Studio 2012 中使用 VB。任何参考都会很棒。
回答by Iswanto San
You can use String.Comparemethod : String.Compare (String strA, String strB, Boolean ignoreCase)
您可以使用String.Compare方法：String.Compare (String strA, String strB, Boolean ignoreCase)
Pass ignoreCaseargument with truewill perform case insensitive comparison.
传递ignoreCase参数 withtrue将执行不区分大小写的比较。
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
Another idea is to uppercase or lowercase the input using ToUpperor ToLower.
另一个想法是使用ToUpper或ToLower将输入大写或小写。
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
回答by beppe9000
According to MSDN in VB.NET, you can use the Option Compare Statementby simply adding 1 line of code to your file:
根据 VB.NET 中的 MSDN，您Option Compare Statement只需在文件中添加 1 行代码即可使用：
Option Compare Text
If you add the above line to the beginning of your code you are telling the CLR to switch from default (Option Compare Binary) to the case-insensitive comparison as the new default for the =operator.
如果将上述行添加到代码的开头，则是在告诉 CLR 从默认值 ( Option Compare Binary)切换到不区分大小写的比较，作为=运算符的新默认值。
I don't know if there is any C# alternative.
我不知道是否有任何 C# 替代方案。
