如何在VB 2010控制台应用程序中取两个字符串的前三个字母来创建某种用户名？

Question

How do you take first three letters of two strings in VB 2010 Console App to make a Username of some sort?

For example

Dim FName As String
Dim SName As String
Dim Username As String

FName = Jonhson
SName = Robertson

Outcome:

Username = JonRob

Answer 1

So you want to take 3 characters from each string and concat both to the UserName ?

One way Substring :

Username = FName.Substring(0, If(FName.Length >= 3, 3, FName.Length)) &
           SName.Substring(0, If(SName.Length >= 3, 3, SName.Length))

Another, Take + Concat + Join :

Username = String.Join("", FName.Take(3).Concat(SName.Take(3)))

Answer 2

您可以使用子字符串

Username = FName.Substring(0, 3) + SName.Substring(0, 3)

Answer 3

Username = String.Format("{0}{1}", FName.SubString(0,3), SName.SubString(0,3))