我正在处理目录和文件的TreeView。用户可以选择一个文件或目录，然后对其进行操作。这要求我有一个方法，根据用户的选择执行不同的操作。
目前，我正在做这样的事情，以确定路径是文件还是目录:
bool bIsFile = false;
bool bIsDirectory = false;
try
{
string[] subfolders = Directory.GetDirectories(strFilePath);
bIsDirectory = true;
bIsFile = false;
}
catch(System.IO.IOException)
{
bIsFolder = false;
bIsFile = true;
}
我不禁觉得有更好的方法可以做到这一点!我希望找到一个标准的。net方法来处理这个问题，但我还没有能够这样做。是否存在这样的方法，如果不存在，确定路径是文件还是目录的最直接的方法是什么?
当前回答
我使用以下，它还测试扩展，这意味着它可以用于测试，如果提供的路径是一个文件，但一个文件不存在。
private static bool isDirectory(string path)
{
bool result = true;
System.IO.FileInfo fileTest = new System.IO.FileInfo(path);
if (fileTest.Exists == true)
{
result = false;
}
else
{
if (fileTest.Extension != "")
{
result = false;
}
}
return result;
}
其他回答
如果你想找到目录，包括那些标记为“hidden”和“system”的目录，试试这个(需要。net V4):
FileAttributes fa = File.GetAttributes(path);
if(fa.HasFlag(FileAttributes.Directory))
最准确的方法是使用shlwapi.dll中的一些互操作代码
[DllImport(SHLWAPI, CharSet = CharSet.Unicode)]
[return: MarshalAsAttribute(UnmanagedType.Bool)]
[ResourceExposure(ResourceScope.None)]
internal static extern bool PathIsDirectory([MarshalAsAttribute(UnmanagedType.LPWStr), In] string pszPath);
然后你可以这样调用它:
#region IsDirectory
/// <summary>
/// Verifies that a path is a valid directory.
/// </summary>
/// <param name="path">The path to verify.</param>
/// <returns><see langword="true"/> if the path is a valid directory;
/// otherwise, <see langword="false"/>.</returns>
/// <exception cref="T:System.ArgumentNullException">
/// <para><paramref name="path"/> is <see langword="null"/>.</para>
/// </exception>
/// <exception cref="T:System.ArgumentException">
/// <para><paramref name="path"/> is <see cref="F:System.String.Empty">String.Empty</see>.</para>
/// </exception>
public static bool IsDirectory(string path)
{
return PathIsDirectory(path);
}
这是我的解决方案，注意，我正在寻找一个函数，严格避免任何不必要的文件系统访问，但这里只允许字符串操作(路径可能不存在):
public static bool IsFolder(string path)
{
if (string.IsNullOrEmpty(path)) return false;
if (path.EndsWith("\\")) return true;
return (path.Contains("\\") && string.IsNullOrEmpty(Path.GetExtension(path)));
}
下面是我们使用的:
using System;
using System.IO;
namespace crmachine.CommonClasses
{
public static class CRMPath
{
public static bool IsDirectory(string path)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
string reason;
if (!IsValidPathString(path, out reason))
{
throw new ArgumentException(reason);
}
if (!(Directory.Exists(path) || File.Exists(path)))
{
throw new InvalidOperationException(string.Format("Could not find a part of the path '{0}'",path));
}
return (new System.IO.FileInfo(path).Attributes & FileAttributes.Directory) == FileAttributes.Directory;
}
public static bool IsValidPathString(string pathStringToTest, out string reasonForError)
{
reasonForError = "";
if (string.IsNullOrWhiteSpace(pathStringToTest))
{
reasonForError = "Path is Null or Whitespace.";
return false;
}
if (pathStringToTest.Length > CRMConst.MAXPATH) // MAXPATH == 260
{
reasonForError = "Length of path exceeds MAXPATH.";
return false;
}
if (PathContainsInvalidCharacters(pathStringToTest))
{
reasonForError = "Path contains invalid path characters.";
return false;
}
if (pathStringToTest == ":")
{
reasonForError = "Path consists of only a volume designator.";
return false;
}
if (pathStringToTest[0] == ':')
{
reasonForError = "Path begins with a volume designator.";
return false;
}
if (pathStringToTest.Contains(":") && pathStringToTest.IndexOf(':') != 1)
{
reasonForError = "Path contains a volume designator that is not part of a drive label.";
return false;
}
return true;
}
public static bool PathContainsInvalidCharacters(string path)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
bool containedInvalidCharacters = false;
for (int i = 0; i < path.Length; i++)
{
int n = path[i];
if (
(n == 0x22) || // "
(n == 0x3c) || // <
(n == 0x3e) || // >
(n == 0x7c) || // |
(n < 0x20) // the control characters
)
{
containedInvalidCharacters = true;
}
}
return containedInvalidCharacters;
}
public static bool FilenameContainsInvalidCharacters(string filename)
{
if (filename == null)
{
throw new ArgumentNullException("filename");
}
bool containedInvalidCharacters = false;
for (int i = 0; i < filename.Length; i++)
{
int n = filename[i];
if (
(n == 0x22) || // "
(n == 0x3c) || // <
(n == 0x3e) || // >
(n == 0x7c) || // |
(n == 0x3a) || // :
(n == 0x2a) || // *
(n == 0x3f) || // ?
(n == 0x5c) || // \
(n == 0x2f) || // /
(n < 0x20) // the control characters
)
{
containedInvalidCharacters = true;
}
}
return containedInvalidCharacters;
}
}
}
using System;
using System.IO;
namespace FileOrDirectory
{
class Program
{
public static string FileOrDirectory(string path)
{
if (File.Exists(path))
return "File";
if (Directory.Exists(path))
return "Directory";
return "Path Not Exists";
}
static void Main()
{
Console.WriteLine("Enter The Path:");
string path = Console.ReadLine();
Console.WriteLine(FileOrDirectory(path));
}
}
}
