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

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;
    }

  }

}

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)) 
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));
          }
     }
}

这样不行吗?

var isFile = Regex.IsMatch(path, @"\w{1,}\.\w{1,}$");

我在遇到类似的问题时遇到过这个问题,只不过我需要检查一个文件或文件夹的路径是否为文件或文件夹,而该文件或文件夹可能实际上并不存在。上面有一些关于答案的评论,提到它们不适用于这种情况。我找到了一个解决方案(我使用VB。NET,但你可以转换,如果你需要),这似乎很适合我:

Dim path As String = "myFakeFolder\ThisDoesNotExist\"
Dim bIsFolder As Boolean = (IO.Path.GetExtension(path) = "")
'returns True

Dim path As String = "myFakeFolder\ThisDoesNotExist\File.jpg"
Dim bIsFolder As Boolean = (IO.Path.GetExtension(path) = "")
'returns False

希望这能对别人有所帮助!

用这个怎么样?

if(File.Exists(data.path))
{
    // is file
}
else if(Directory.Exists(data.path))
{
   // is Folder 
}
else
{
   // invalid path
}

file。exists()如果不是文件将返回false即使目录确实存在,如果它返回true,我们就知道我们得到了一个文件,如果它返回false,我们就得到了一个目录或一个无效路径接下来我们用directory。exists()测试它是否是一个有效目录如果返回true,我们就有一个目录如果不是,它是一个无效路径。