VBA如何在函数中使用可选参数
如何在Visual Basic中使用可选参数来执行应用程序
下面的代码接收一系列的string,并用分隔符将它们连接起来。
Function concat(range, sep) mystring = "" For Each item In range mystring = mystring & sep & item Next mystring = Right(mystring, Len(mystring) - Len(sep)) 'removes preceding separator concat = mystring End Function
我想sep是一个可选参数,所以我可以调用concat(范围),而不是concat(范围;“”)
在Python中的例子:
def concat(range, sep="") mystring = "" for i in range: mystring += sep + i mystring = mystring[len(sep)::] return mystring
你会想要声明的types。
使用关键字Optional
Function concat(rng As range, Optional sep As String = "") Dim mystring As String Dim itm As range mystring = "" For Each itm In rng mystring = mystring & sep & itm Next mystring = Right(mystring, Len(mystring) - Len(sep)) 'removes preceding separator concat = mystring End Function