Question

 var dir1Files = dir1.GetFiles("*", SearchOption.AllDirectories);
 var dir2Files = dir2.GetFiles("*", SearchOption.AllDirectories);

 var difference = dir1Files.ToHashSet(); 
 difference.SymmetricExceptWith(dir2Files);

 string[] foo1 = difference.Select(c => c.Name).ToArray();
 File.WriteAllLines(@"d:\log1.txt", foo1);

这里我将基于名称和文本文件中的两个文件进行比较...但我需要将名称和目录名称一起写为comparing two folders for non identical files? ...

有任何建议吗？

修改我有两个文件夹A和B ..里面有两个文件夹，有很多文件夹和文件... 我将这两个文件夹与具有对称差异的非相同文件进行比较，并将名称和目录名称写入文本文件...我的问题是对称差异工作正常，并且将两个不相同的文件名写入日志文件...但我必须用该目录名写出文件名......

此代码工作正常

var dir1Files = dir1.GetFiles("*", SearchOption.AllDirectories).Select(x => new { x.Name, x.Length });
var dir2Files = dir2.GetFiles("*", SearchOption.AllDirectories).Select(x => new { x.Name, x.Length });
var difference = dir1Files.ToHashSet();      
difference.SymmetricExceptWith(dir2Files);
string[] foo1 = difference.Select(c => c.Name).ToArray();
File.WriteAllLines(@"d:\log1.txt", foo1);

这里我不能这样给予

string[] foo1 = difference.Select(c => c.Name+""+c.DirectoryName).ToArray();

Answer 1

我认为最好的方法是编写自己的IEqualityComparer<FileInfo>实现，强制执行两个文件之间的相等定义。

public class FileInfoNameLengthEqualityComparer : EqualityComparer<FileInfo>
{
    public override bool Equals(FileInfo x, FileInfo y)
    {
        if (x == y)
            return true;

        if (x == null || y == null)
            return false;

        // 2 files are equal if their names and lengths are identical.
        return x.Name == y.Name && x.Length == y.Length;
    }

    public override int GetHashCode(FileInfo obj)
    {
        return obj == null
               ? 0  : obj.Name.GetHashCode() ^ obj.Length.GetHashCode();
    }
}

然后其余部分看起来像（未经测试）：

// Construct custom equality-comparer.
var comparer = new FileInfoNameLengthEqualityComparer();

// Create sets of files from each directory.
var sets = new[] { dir1, dir2 }
                 .Select(d => d.GetFiles("*", SearchOption.AllDirectories))
                 .Select(files => new HashSet<FileInfo>(files, comparer))
                 .ToArray();

// Make the first set contain the set-difference as determined 
// by the equality-comparer.
sets[0].SymmetricExceptWith(sets[1]);

// Project each file to its full name and write the file-names
// to the log-file.
var lines = sets[0].Select(fileInfo => fileInfo.FullName).ToArray();
File.WriteAllLines(@"d:\log1.txt", lines);

使用SymmetricDifference比较非相同文件的两个文件夹

1 个答案: