最初不返回值的函数是否应该返回Nothing（因为 Visual Studio 在End Function语句中添加了一个绿色曲线，询问您是否忘记返回值），或者我可以忽略 VS 的提示？回国有什么影响Nothing，或者有什么影响吗？
tl;dr：这个示例代码应该返回Nothing还是不需要？真的很欢迎解释！
Public Shared sCaminhoGravacaoXML As String = "C:\\XMLData\\"\n\n Public Shared Function VerificaPastasXML()\n\n If Not IsNothing(sCaminhoGravacaoXML) And sCaminhoGravacaoXML <> "" Then\n\n Dim sRaiz As String = sCaminhoGravacaoXML\n\n If Not FileIO.FileSystem.DirectoryExists(sRaiz) Then\n FileIO.FileSystem.CreateDirectory(sRaiz)\n End If\n\n If Not Directory.Exists(sRaiz & "tempXML") Then\n Dim diInfo As DirectoryInfo = Directory.CreateDirectory(sRaiz & "tempXML")\n diInfo.Attributes = FileAttributes.Directory Or FileAttributes.Hidden\n End If\n\n Else\n sErroBaixaXML = "N\xc3\xa3o foi poss\xc3\xadvel montar a estrutura …