搜索文件或文件内容

public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";

        string strkey = context.Request["key"];

        string path = context.Server.MapPath("~/news_html");
        List<FileInfo> listJs = new List<FileInfo>();
        if (!string.IsNullOrWhiteSpace(strkey))
        {
            GetFiles(path, (FileInfo file) =>
            {
                if (file.Extension.Equals(".html") && file.Name.Contains(strkey))
                {
                    listJs.Add(file);
                }
            });
        }
        else
        {
            GetFiles(path, (FileInfo file) =>
            {
                if (file.Extension.Equals(".html"))
                {

                    listJs.Add(file);
                }
            });
        }
        context.Response.Write(JsonConvert.SerializeObject(listJs));
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="path"></param>
    /// <param name="fileRule"></param>
    public void GetFiles(string path, Action<FileInfo> fileRule)
    {
        Queue<string> queue = new Queue<string>();
        queue.Enqueue(path);
        while (queue.Count > 0)
        {
            DirectoryInfo dirInfo = new DirectoryInfo(queue.Dequeue());
            foreach (DirectoryInfo dirchildInfo in dirInfo.GetDirectories())
            {
                queue.Enqueue(dirchildInfo.FullName);
            }

            foreach (FileInfo dirfileInfo in dirInfo.GetFiles())
            {
                fileRule(dirfileInfo);
            }
        }
    }


    /// <summary>
    /// 从文件中找关键字
    /// </summary>
    /// <param name="filename"></param>
    /// <param name="word"></param>
    public void FindInFile(string filename, string word)
    {
        System.IO.StreamReader sr = System.IO.File.OpenText(filename);
        string s = sr.ReadToEnd();
        sr.Close();
        string[] temp = s.Split('\n');
        for (int i = 0; i < temp.Length; i++)
        {
            if (temp[i].IndexOf(word) != -1)
            {
                Console.WriteLine(string.Format(
                "Found in: {0}\n{1}\nLine: {2} \n",
                filename, temp[i].Trim(), i + 1));
            }
        }
    }
    /// <summary>
    /// 从文件夹中找关键字
    /// </summary>
    /// <param name="foldername"></param>
    /// <param name="word"></param>
    public void FindInDirectory(string foldername, string word)
    {
        System.IO.DirectoryInfo dif = new System.IO.DirectoryInfo(foldername);
        //遍历文件夹中的各子文件夹
        foreach (System.IO.DirectoryInfo di in dif.GetDirectories())
        {
            FindInDirectory(di.FullName, word);
        }
        //查询文件夹中的各个文件
        foreach (System.IO.FileInfo f in dif.GetFiles())
        {
            FindInFile(f.FullName, word);
        }
    }

    public bool IsReusable {
        get {
            return false;
        }
    }