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原文出处：http://www.oschina.net/code/snippet_222150_11129

        FileInfo fi = new FileInfo("C:\\test.txt");

        Console.WriteLine(fi.CreationTime.ToString());
        Console.WriteLine(fi.LastWriteTime.ToString());
        Console.WriteLine(fi.LastAccessTime.ToString());


        // 改变（设置）文件的创建、修改、访问时间
        File.SetCreationTime("C:\\test.txt", DateTime.Now.AddYears(-1));
        File.SetLastWriteTime("C:\\test.txt", DateTime.Now.AddYears(-2));
        File.SetLastAccessTime("C:\\test.txt", DateTime.Now.AddYears(-3));