c# http下载2 创建多个下载任务

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using httpTool;
using System.Threading;

namespace HttpDownLoad
{
    public partial class ListItem : UserControl
    {
        private string urlValue;
        private string savePathValue;
        private bool stateValue; //false=>未下载完成；true=>下载完成

        HttpHelper downLoadManager;

        //下载文件信息
        public class downLoadFileInfo
        {
            public string id;
            public string name;
            public string path;
            public string url;
            public bool state;
        }

        public ListItem()
        {
            InitializeComponent();
        }

        private void ListItem_Load(object sender, EventArgs e)
        {
            this.label5.Text = IdValue;
        }

        //下载地址
        public string UrlValue
        {
            get
            {
                return urlValue;
            }

            set
            {
                urlValue = value;
            }
        }

        //任务编号
        public string IdValue
        {
            get
            {
                return label5.Text;
            }

            set
            {
                label5.Text = value;
            }
        }

        //文件名称
        public string NameValue
        {
            get
            {
                return GetFileName(savePathValue);
            }
        }

        //文件保存位置
        public string SavePathValue
        {
            get
            {
                return savePathValue;
            }

            set
            {
                savePathValue = value;
            }
        }

        //下载状态
        public bool StateValue
        {
            get
            {
                return stateValue;
            }

            set
            {
                stateValue = value;
            }
        }

        //下载开始
        public void DownLoadStart()
        {
            //下载状态
            this.StateValue = false;
            //下载初始化
            downLoadManager = new HttpHelper(UrlValue, SavePathValue);
            downLoadManager.timer = new System.Windows.Forms.Timer();
            downLoadManager.processShow += processShow;
            downLoadManager.processCompleted += processComplete;
            downLoadManager.processFailed += processFailed;
            downLoadManager.init();
            Thread.Sleep(1000);
            downLoadManager.DownLoadStart();

        }

        //更新暂停、继续
        private void button1_Click(object sender, EventArgs e)
        {
            if (this.StateValue == false)
            { //下载状态
                this.button1.Text = "继续";
                downLoadManager.DownLoadPause();
            }
            else
            { //停止状态
                this.button1.Text = "暂停";
                downLoadManager.DownLoadContinue();
            }
            this.StateValue = !this.StateValue;
        }

        //下载信息显示
        private void processShow(string totalNum, string num, int proc, string speed, string remainTime, string msg)
        {
            this.label2.Text = speed;
            this.label7.Text = remainTime;
            this.progressBar1.Value = proc;
        }

        //下载完成回调
        private void processComplete()
        {
            this.StateValue = true;
            MessageBox.Show(string.Format("文件：{0} 下载完成", NameValue));
        }

        //下载失败回调
        private void processFailed(string msg)
        {
            this.StateValue = true;
            MessageBox.Show(string.Format("文件：{0} 下载失败", NameValue));
        }

        //根据文件地址获取名称
        private string GetFileName(string path)
        {

            return System.IO.Path.GetFileName(path);
        }

        //文件信息
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            downLoadFileInfo fileInfo = new downLoadFileInfo();

            fileInfo.id = IdValue;
            fileInfo.name = NameValue;
            fileInfo.path = savePathValue;
            fileInfo.url = UrlValue;
            fileInfo.state = StateValue;

            InfoDialog info = new InfoDialog(fileInfo);
            info.ShowDialog();
        }

        //显示文件名称
        private void pictureBox1_MouseHover(object sender, EventArgs e)
        {
            this.toolTip1.SetToolTip(this.pictureBox1, NameValue);
        }


    }
}

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