c# winform通过webservice下载文件

来源：互联网发布：尊宝比萨加盟知乎编辑：程序博客网时间：2024/06/01 19:50

1）winform 窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace winform
{
    public partial class Form1 : Form
    {
        private ws.WebService1 lws = new winform.ws.WebService1();
        public Form1()
        {
            InitializeComponent();

this.Load+=new EventHandler(Form1_Load);
}

        private void Form1_Load(object sender, EventArgs e)
        {
            DownloadImage();
        }
        /// <summary>
        /// 下载图片附件
        /// </summary>
        /// <param name="attachments"></param>
        /// <returns></returns>
        private void DownloadImage()
        {
            string path = @"image\img2.jpg";//服务器图片路径
            string directoryPath = @"c:\test";//本地文件夹路径
            string downloadPath = @"c:\test\img2.jpg";//本地图片路径
            try
            {
                byte[] bytes = lws.DownloadFile(path);
                if (bytes != null)
                {
                    if (!Directory.Exists(directoryPath)) { Directory.CreateDirectory(directoryPath); }//如果不存在完整的上传路径就创建
                    FileInfo downloadInfo = new FileInfo(directoryPath);
                    if (downloadInfo.IsReadOnly) { downloadInfo.IsReadOnly = false; }
                    //定义并实例化一个内存流，以存放提交上来的字节数组。
                    MemoryStream ms = new MemoryStream(bytes);
                    //定义实际文件对象，保存上载的文件。
                    FileStream fs = new FileStream(downloadPath, FileMode.Create);
                    ///把内内存里的数据写入物理文件
                    ms.WriteTo(fs);
                    fs.Flush();
                    ms.Flush();
                    ms.Close();
                    fs.Close();
                    fs = null;
                    ms = null;
                }
            }
            catch
            {
            }
        }
    }
}

2）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;

namespace web
{
    /// <summary>
    /// WebService1 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 WebService1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld()
        {
            return "Hello World";
        }
        /// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>返回文件流</returns>
        [WebMethod]
        public byte[] DownloadFile(string path)
        {
            FileStream fs = null;
            path = Server.MapPath(path);
            if (File.Exists(path))
            {
                try
                {
                    ///打开现有文件以进行读取。
                    fs = File.OpenRead(path);
                    return ConvertStreamToByteBuffer(fs);

                }
                catch (Exception ex)
                {
                    return new byte[0];
                }
                finally
                {
                    fs.Close();
                }
            }
            else
            {
                return new byte[0];
            }
        }
        /// <summary>
        /// 把给定的文件流转换为二进制字节数组。
        /// </summary>
        /// <param name="stream">文件流</param>
        /// <returns>返回二进制数组</returns>
        public static byte[] ConvertStreamToByteBuffer(System.IO.Stream stream)
        {
            int b1;
            System.IO.MemoryStream tempStream = new System.IO.MemoryStream();
            while ((b1 = stream.ReadByte()) != -1)
            {
                tempStream.WriteByte(((byte)b1));
            }
            return tempStream.ToArray();
        }

}
}