.net 写文件上传下载webservice

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 = "http://tempuri.org/")]
??? [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,data.Length);
??????????????????? fs.Close();
??????????????????? return true;
??????????????? }
??????????????? else return false;
??????????? }
??????????? catch
??????????? {
??????????????? return false;
??????????? }
??????? }

??????? protected bool LogWrite( string content)
??????? {
??????????? try
??????????? {
??????????????? //读取
??????????????? string file = "C:22222.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。