What method can be used in VB to determine if a number is an integer?

In VB, you can use the IsNumeric function to determine if a string is an integer. The specific method is as follows:

Dim inputStr As String
inputStr = "1234"

If IsNumeric(inputStr) Then
    If Int(inputStr) = CDbl(inputStr) Then
        MsgBox "是整数"
    Else
        MsgBox "不是整数"
    End If
Else
    MsgBox "不是数字"
End If

The above code first uses the IsNumeric function to check if the input string is a number. It then converts the string to an integer and a double precision floating point number using the Int and CDbl functions for comparison. If they are equal, it means the string is an integer.