vb.net - 检查字符串变量是否具有整数值

Question

我正在做一个允许 children 向圣诞老人发送信息的项目。不幸的是，如果他们在 AGE 字段中输入字符串而不是整数，程序会崩溃并返回从字符串“[exampleString]”到类型“Double”的转换无效。
有没有办法检查他们是否输入了整数？这是代码。

If childAge > 0 And childAge < 150 Then
    fmSecA2 = "Wow! You are already " & childAge & " years old? You're growing to be a big " & childGender & " now! "
Else
    fmSecA2 = "Erm, I couldn't really understand your age. Are you making this up? Ho ho ho!"
End If

谢谢，
凯:)

Answer 1

一个非常简单的技巧是 try parse字符串作为整数。如果成功，它是一个整数(惊喜惊喜)。

Dim childAgeAsInt As Integer
If Integer.TryParse(childAge, childAgeAsInt) Then
    ' childAge successfully parsed as Integer
Else
    ' childAge is not an Integer
End If