VB.NET的隐藏功能？

Question

我已经学习了很多浏览C＃的隐藏功能，当我找不到类似于VB.NET的东西时，我感到很惊讶。那么它的一些隐藏或鲜为人知的特征是什么？

Answer 1

该Exception When条款基本上未知。

考虑一下：

Public Sub Login(host as string, user as String, password as string, _

                            Optional bRetry as Boolean = False)

Try

   ssh.Connect(host, user, password)

Catch ex as TimeoutException When Not bRetry

   ''//Try again, but only once.

   Login(host, user, password, True)

Catch ex as TimeoutException

   ''//Log exception

End Try

End Sub

Answer 2

你有没有注意到Like比较运算符？

    Dim b As Boolean = "file.txt" Like "*.txt"

更多来自MSDN

Dim testCheck As Boolean

' The following statement returns True (does "F" satisfy "F"?)'

testCheck = "F" Like "F"

' The following statement returns False for Option Compare Binary'

'    and True for Option Compare Text (does "F" satisfy "f"?)'

testCheck = "F" Like "f"

' The following statement returns False (does "F" satisfy "FFF"?)'

testCheck = "F" Like "FFF"

' The following statement returns True (does "aBBBa" have an "a" at the'

'    beginning, an "a" at the end, and any number of characters in '

'    between?)'

testCheck = "aBBBa" Like "a*a"

' The following statement returns True (does "F" occur in the set of'

'    characters from "A" through "Z"?)'

testCheck = "F" Like "[A-Z]"

' The following statement returns False (does "F" NOT occur in the '

'    set of characters from "A" through "Z"?)'

testCheck = "F" Like "[!A-Z]"

' The following statement returns True (does "a2a" begin and end with'

'    an "a" and have any single-digit number in between?)'

testCheck = "a2a" Like "a#a"

' The following statement returns True (does "aM5b" begin with an "a",'

'    followed by any character from the set "L" through "P", followed'

'    by any single-digit number, and end with any character NOT in'

'    the character set "c" through "e"?)'

testCheck = "aM5b" Like "a[L-P]#[!c-e]"

' The following statement returns True (does "BAT123khg" begin with a'

'    "B", followed by any single character, followed by a "T", and end'

'    with zero or more characters of any type?)'

testCheck = "BAT123khg" Like "B?T*"

' The following statement returns False (does "CAT123khg" begin with'

'    a "B", followed by any single character, followed by a "T", and'

'    end with zero or more characters of any type?)'

testCheck = "CAT123khg" Like "B?T*"