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)) 

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。

也许是UWP c#

public static async Task<IStorageItem> AsIStorageItemAsync(this string iStorageItemPath)
    {
        if (string.IsNullOrEmpty(iStorageItemPath)) return null;
        IStorageItem storageItem = null;
        try
        {
            storageItem = await StorageFolder.GetFolderFromPathAsync(iStorageItemPath);
            if (storageItem != null) return storageItem;
        } catch { }
        try
        {
            storageItem = await StorageFile.GetFileFromPathAsync(iStorageItemPath);
            if (storageItem != null) return storageItem;
        } catch { }
        return storageItem;
    }

我知道这游戏太迟了，但我还是想分享这个。如果你只是将路径作为字符串来处理，这很容易:

private bool IsFolder(string ThePath)
{
    string BS = Path.DirectorySeparatorChar.ToString();
    return Path.GetDirectoryName(ThePath) == ThePath.TrimEnd(BS.ToCharArray());
}

例如: ThePath == "C:\SomeFolder\File1.txt"将结束如下:

return "C:\SomeFolder" == "C:\SomeFolder\File1.txt" (FALSE)

另一个例子: ThePath == "C:\SomeFolder\"将结束如下:

return "C:\SomeFolder" == "C:\SomeFolder" (TRUE)

这也可以在没有后面的反斜杠的情况下工作: ThePath == "C:\SomeFolder"将结束如下:

return "C:\SomeFolder" == "C:\SomeFolder" (TRUE)

请记住，这只适用于路径本身，而不适用于路径和“物理磁盘”之间的关系……所以它不能告诉你路径/文件是否存在或类似的东西，但它肯定能告诉你路径是文件夹还是文件……

很晚才到这里，但我发现Nullable<Boolean>返回值相当难看- IsDirectory(字符串路径)返回null并不等于没有详细注释的不存在的路径，所以我提出了以下内容:

public static class PathHelper
{
    /// <summary>
    /// Determines whether the given path refers to an existing file or directory on disk.
    /// </summary>
    /// <param name="path">The path to test.</param>
    /// <param name="isDirectory">When this method returns, contains true if the path was found to be an existing directory, false in all other scenarios.</param>
    /// <returns>true if the path exists; otherwise, false.</returns>
    /// <exception cref="ArgumentNullException">If <paramref name="path"/> is null.</exception>
    /// <exception cref="ArgumentException">If <paramref name="path"/> equals <see cref="string.Empty"/></exception>
    public static bool PathExists(string path, out bool isDirectory)
    {
        if (path == null) throw new ArgumentNullException(nameof(path));
        if (path == string.Empty) throw new ArgumentException("Value cannot be empty.", nameof(path));

        isDirectory = Directory.Exists(path);

        return isDirectory || File.Exists(path);
    }
}

这个helper方法写得足够冗长和简洁，以便在第一次阅读时就能理解其意图。

/// <summary>
/// Example usage of <see cref="PathExists(string, out bool)"/>
/// </summary>
public static void Usage()
{
    const string path = @"C:\dev";

    if (!PathHelper.PathExists(path, out var isDirectory))
        return;

    if (isDirectory)
    {
        // Do something with your directory
    }
    else
    {
        // Do something with your file
    }
}

使用这篇文章中所选的答案，我看了评论并给予了信任 @ŞafakGür， @Anthony和@Quinn Wilson，他们的信息让我得到了这个改进的答案，我写了并测试了:

    /// <summary>
    /// Returns true if the path is a dir, false if it's a file and null if it's neither or doesn't exist.
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    public static bool? IsDirFile(this string path)
    {
        bool? result = null;

        if(Directory.Exists(path) || File.Exists(path))
        {
            // get the file attributes for file or directory
            var fileAttr = File.GetAttributes(path);

            if (fileAttr.HasFlag(FileAttributes.Directory))
                result = true;
            else
                result = false;
        }

        return result;
    }