delphi - System.IOUtils.TDirectory.GetParent 奇怪的行为？

Question

GetParent('c:\1\2\') 的结果是 'c:\1\2'。

GetParent('c:\1\2') 的结果是 'c:\1'。

这是正常/预期的行为吗？如果是，其背后的逻辑是什么？

Answer 1

这种行为可能看起来有点奇怪，但这是设计使然。该类以 .net 类 Directory 为模型。 documentation对于 Directory.GetParent 说:

The string returned by this method consists of all characters in the path up to, but not including, the last DirectorySeparatorChar or AltDirectorySeparatorChar. For example, passing the path "C:\Directory\SubDirectory\test.txt" to GetParent returns "C:\Directory\SubDirectory". Passing "C:\Directory\SubDirectory" returns "C:\Directory". However, passing "C:\Directory\SubDirectory\" returns "C:\Directory\SubDirectory", because the ending directory separator is after "SubDirectory".