다른 답변의 제안을 결합한 후 Ronnie Overby의 답변 과 동일한 내용을 생각해 냈습니다 . 다음은 몇 가지 고려해야 할 사항을 지적하는 테스트입니다.
- 폴더에는 "확장자"가있을 수 있습니다.
C:\Temp\folder_with.dot
- 파일은 디렉토리 구분 기호 (슬래시)로 끝날 수 없습니다
- 기술적으로 플랫폼에 따라 두 개의 디렉토리 구분 기호가 있습니다 (예 : 슬래시 이거나 아닐 수 있음)
Path.DirectorySeparatorChar 및 Path.AltDirectorySeparatorChar)
테스트 (Linqpad)
var paths = new[] {
// exists
@"C:\Temp\dir_test\folder_is_a_dir",
@"C:\Temp\dir_test\is_a_dir_trailing_slash\",
@"C:\Temp\dir_test\existing_folder_with.ext",
@"C:\Temp\dir_test\file_thats_not_a_dir",
@"C:\Temp\dir_test\notadir.txt",
// doesn't exist
@"C:\Temp\dir_test\dne_folder_is_a_dir",
@"C:\Temp\dir_test\dne_folder_trailing_slash\",
@"C:\Temp\dir_test\non_existing_folder_with.ext",
@"C:\Temp\dir_test\dne_file_thats_not_a_dir",
@"C:\Temp\dir_test\dne_notadir.txt",
};
foreach(var path in paths) {
IsFolder(path/*, false*/).Dump(path);
}
결과
C:\Temp\dir_test\folder_is_a_dir
True
C:\Temp\dir_test\is_a_dir_trailing_slash\
True
C:\Temp\dir_test\existing_folder_with.ext
True
C:\Temp\dir_test\file_thats_not_a_dir
False
C:\Temp\dir_test\notadir.txt
False
C:\Temp\dir_test\dne_folder_is_a_dir
True
C:\Temp\dir_test\dne_folder_trailing_slash\
True
C:\Temp\dir_test\non_existing_folder_with.ext
False (this is the weird one)
C:\Temp\dir_test\dne_file_thats_not_a_dir
True
C:\Temp\dir_test\dne_notadir.txt
False
방법
/// <summary>
/// Whether the <paramref name="path"/> is a folder (existing or not);
/// optionally assume that if it doesn't "look like" a file then it's a directory.
/// </summary>
/// <param name="path">Path to check</param>
/// <param name="assumeDneLookAlike">If the <paramref name="path"/> doesn't exist, does it at least look like a directory name? As in, it doesn't look like a file.</param>
/// <returns><c>True</c> if a folder/directory, <c>false</c> if not.</returns>
public static bool IsFolder(string path, bool assumeDneLookAlike = true)
{
// /programming/1395205/better-way-to-check-if-path-is-a-file-or-a-directory
// turns out to be about the same as https://stackoverflow.com/a/19596821/1037948
// check in order of verisimilitude
// exists or ends with a directory separator -- files cannot end with directory separator, right?
if (Directory.Exists(path)
// use system values rather than assume slashes
|| path.EndsWith("" + Path.DirectorySeparatorChar)
|| path.EndsWith("" + Path.AltDirectorySeparatorChar))
return true;
// if we know for sure that it's an actual file...
if (File.Exists(path))
return false;
// if it has an extension it should be a file, so vice versa
// although technically directories can have extensions...
if (!Path.HasExtension(path) && assumeDneLookAlike)
return true;
// only works for existing files, kinda redundant with `.Exists` above
//if( File.GetAttributes(path).HasFlag(FileAttributes.Directory) ) ...;
// no idea -- could return an 'indeterminate' value (nullable bool)
// or assume that if we don't know then it's not a folder
return false;
}