using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System.Xml.Linq;

using System.IO;

using System.Text;

namespace UpDownFile

{

    /// <summary>

    /// Service1 的摘要说明

    /// </summary>

    [WebService(Namespace = "")]

    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

    [ToolboxItem(false)]

    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。

    // [System.Web.Script.Services.ScriptService]

    public class UpDownFile : System.Web.Services.WebService

    {

        private static string filesavepath = System.Configuration.ConfigurationManager.AppSettings.Get("filepath");

        /// <summary>

        /// 下载文件

        /// </summary>

        /// <param name="filename"></param>

        /// <returns></returns>

        [WebMethod]

        public bool DownFile(string filename,out byte[] bytes)

        {

            string filepath = filesavepath + filename;

            LogWrite(filepath);

            if (File.Exists(filepath))

            {

                try

                {

                    FileStream s = File.OpenRead(filepath);

                    bytes = ConvertStreamToByteBuffer(s);

                    s.Close();

                    return true;

                }

                catch

                {

                    bytes = new byte[0];

                    return false;

                }

            }

            else

            {

                bytes = new byte[0];

                return false;

            }

        }

        public byte[] ConvertStreamToByteBuffer(Stream s)

        {

            MemoryStream ms = new MemoryStream();

            int b;

            s.Seek(0, 0);

            while ((b = s.ReadByte()) !=-1)

            {

                ms.WriteByte((byte)b);

            }

            return ms.ToArray();

        }

        [WebMethod]

        public bool UpFile(byte[] data, string filepath, string filename)

        {

            try

            {

                filepath = filesavepath + filepath;

                if (!Directory.Exists(filepath))

                {

                    Directory.CreateDirectory(filepath);

                }

                if (Directory.Exists(filepath))

                {

                    string fullname = filepath + filename;

                    if (File.Exists(fullname))

                    {

                        File.Delete(fullname);

                    }

                    FileStream fs = File.Create(fullname);

                    fs.Write(data, 0, data.Length);

                    fs.Close();

                    return true;

                }

                else return false;

            }

            catch

            {

                return false;

            }

        }

        protected bool LogWrite( string content)

        {

            try

            {

                //读取

                string file = "C:\\11111.txt";

                StreamReader sr = new StreamReader(file, true);

                string s = sr.ReadLine();

                sr.Close();

                //写入 与源文件字符相加

                StreamWriter sw = new StreamWriter(file, true, Encoding.UTF8);

                sw.WriteLine(s + content);

                sw.Close();

                return true;

            }

            catch (Exception ex)

            {

                //Response.Write(ex.Message.ToString());

                return false;

            }

        }

    }

}

 

注意：一定要加 s.Seek(0, 0);否则下载回来的文件数据会有丢失。