比较两个文件夹中的内容

[c#]代码库
using System.IO;
using System.Collections.Generic;
namespace QueryCompareTwoDirs
{
class CompareDirs
{
    static void Main ( string[] args )
    {
        // Create two identical or different temporary folders
        // on a local drive and change these file paths.
        string pathA = @"C:\TestDir";
        string pathB = @"C:\TestDir2";
        DirectoryInfo dir1 = new DirectoryInfo ( pathA );
        DirectoryInfo dir2 = new DirectoryInfo ( pathB );
        // Take a snapshot of the file system.
        IEnumerable list1 = dir1.GetFiles ( "*.*", SearchOption.AllDirectories );
        IEnumerable list2 = dir2.GetFiles ( "*.*", SearchOption.AllDirectories );
        //A custom file comparer defined below
        FileCompare myFileCompare = new FileCompare();
        // This query determines whether the two folders contain
        // identical file lists, based on the custom file comparer
        // that is defined in the FileCompare class.
        // The query executes immediately because it returns a bool.
        bool areIdentical = list1.SequenceEqual ( list2, myFileCompare );
        if ( areIdentical == true )
        {
            Console.WriteLine ( "the two folders are the same" );
        }
        else
        {
            Console.WriteLine ( "The two folders are not the same" );
        }
        // Find the common files. It produces a sequence and doesn't
        // execute until the foreach statement.
        var queryCommonFiles = list1.Intersect ( list2, myFileCompare );
        if ( queryCommonFiles.Count() > 0 )
        {
            Console.WriteLine ( "The following files are in both folders:" );
            foreach ( var v in queryCommonFiles )
            {
                Console.WriteLine ( v.FullName ); //shows which items end up in result list
            }
        }
        else
        {
            Console.WriteLine ( "There are no common files in the two folders." );
        }
        // Find the set difference between the two folders.
        // For this example we only check one way.
        var queryList1Only = ( from file in list1
                               select file ).Except ( list2, myFileCompare );
        Console.WriteLine ( "The following files are in list1 but not list2:" );
        foreach ( var v in queryList1Only )
        {
            Console.WriteLine ( v.FullName );
        }
        // Keep the console window open in debug mode.
        Console.WriteLine ( "Press any key to exit." );
        Console.ReadKey();
    }
}
// This implementation defines a very simple comparison
// between two FileInfo objects. It only compares the name
// of the files being compared and their length in bytes.
class FileCompare : IEqualityComparer
{
    public FileCompare() { }
    public bool Equals ( FileInfo f1, FileInfo f2 )
    {
        return ( f1.Name == f2.Name &&
                 f1.Length == f2.Length );
    }
    // Return a hash that reflects the comparison criteria. According to the
    // rules for IEqualityComparer, if Equals is true, then the hash codes must
    // also be equal. Because equality as defined here is a simple value equality, not
    // reference identity, it is possible that two or more objects will produce the same
    // hash code.
    public int GetHashCode ( FileInfo fi )
    {
        string s = String.Format ( "{0}{1}", fi.Name, fi.Length );
        return s.GetHashCode();
    }
}
}
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