LeCall/Lecall/FrmDownLoad.cs

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

namespace Lecall
{
    public partial class FrmDownLoad : Form
    {
        public FrmDownLoad()
        {
            InitializeComponent();
        }
        public string filename = "";
        public string originalurl = "";
        private void btnDown_Click(object sender, EventArgs e)
        {
            DownloadFile(this .Text , @"C:\123.rar");
        }
        /// <summary>        
        /// c#,.net 下载文件        
        /// </summary>        
        /// <param name="URL">下载文件地址</param>       
        /// 
        /// <param name="Filename">下载后的存放地址</param>        
        /// <param name="Prog">用于显示的进度条</param>        
        /// 
        public bool DownloadFile(string URL, string filename)
        {
            
            bool downfinished = false;
            float percent = 0;
            try
            {

                if (URL.Contains("application/vnd.ms-excel;base64"))
                {
                    string tmpContent = URL;//获取传递上来的文件内容  
                    string contentHead = "data:application/vnd.ms-excel;base64,";
                    int startIndex = tmpContent.IndexOf(contentHead);
                    int name_StartIndex = tmpContent.IndexOf(contentHead) + contentHead.Length;
                    int name_EndIndex = tmpContent.IndexOf('#');
                    
                    string fileName = filename;// "Excel表格";
                    if (name_EndIndex != -1)
                    {
                        fileName = Uri.UnescapeDataString(tmpContent.Substring(name_StartIndex, name_EndIndex - name_StartIndex));
                        tmpContent = tmpContent.Substring(name_EndIndex + 1);
                    }
                    else
                    {
                        tmpContent = tmpContent.Substring(name_StartIndex);
                    }
                    byte[] output = Convert.FromBase64String(tmpContent);
                    //SaveFileDialog dialog = new SaveFileDialog();
                    //dialog.FileName = fileName + ".xls";
                    //dialog.Filter = "(Excel文件)|*.xls";
                    //DialogResult result = dialog.ShowDialog();
                    //if (result == DialogResult.OK)
                    //{
                    using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
                    {
                        fs.Write(output, 0, output.Length);
                        fs.Flush();
                    }
                    return true;
                    //}
                }
                else
                {
                    

                    #region
                    System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);
                    System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse();
                    long totalBytes = myrp.ContentLength;
                    if (prog != null && totalBytes > 0)
                    {
                        prog.Maximum = (int)totalBytes;
                    }
                    #region 保存文件对话框
                    SaveFileDialog saveFileDialog1 = new SaveFileDialog();

                    //设置文件类型  
                    saveFileDialog1.Filter = "*.wav|*.wav";//|*.mp3|*.mp3
                                                           //设置文件名称：
                    saveFileDialog1.FileName = filename;

                    //设置默认文件类型显示顺序  
                    //saveFileDialog1.FilterIndex = 2;

                    //保存对话框是否记忆上次打开的目录  
                    saveFileDialog1.RestoreDirectory = true;

                    //点了保存按钮进入  
                    //if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                    //{

                    //}
                    //else
                    //{
                    //    this.Close();
                    //    return;
                    //}
                    #endregion

                    System.IO.Stream st = myrp.GetResponseStream();
                    System.IO.Stream so = new System.IO.FileStream(filename, System.IO.FileMode.Create);
                    long totalDownloadedByte = 0;
                    byte[] by = new byte[1024];
                    int osize = st.Read(by, 0, (int)by.Length);
                    while (osize > 0)
                    {
                        totalDownloadedByte = osize + totalDownloadedByte;
                        System.Windows.Forms.Application.DoEvents();
                        so.Write(by, 0, osize);
                        if (prog != null && totalDownloadedByte > 0)
                        {
                            if (prog.Maximum > (int)totalDownloadedByte)
                            {
                                prog.Value = (int)totalDownloadedByte;
                            }
                        }
                        osize = st.Read(by, 0, (int)by.Length);

                        percent = (float)totalDownloadedByte / (float)totalBytes * 100;

                        System.Windows.Forms.Application.DoEvents(); //必须加注这句代码，否则label1将因为循环执行太快而来不及显示信息
                    }
                    so.Close();
                    st.Close();
                    downfinished = true;
                    #endregion
                }
            }
            catch (System.Exception)
            {
                throw;
            }
            return downfinished;
        }


        private void FrmDownLoad_Load(object sender, EventArgs e)
        {
            if (File.Exists(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + filename))
            {
                filename = filename + "(1)";
            }
            #region
            int index = 0;//匹配计数器
            string strKey = filename ;//匹配字符串

            DirectoryInfo myDir = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory));
            FileInfo[] _fileList = myDir.GetFiles();
            for (int i = 0; i < _fileList.Length; i++)
            {
                if (_fileList[i].Name.Contains(strKey))
                {
                    Console.WriteLine(_fileList[i].Name);
                    index++;
                }
            }
            int pindex = filename.IndexOf(".");

            if (index > 0)
            {
                string insertStr= "(" + index.ToString() + ")";
                filename = filename.Insert(filename.LastIndexOf('.'), insertStr);
                
            }
            #endregion

            this.Text = "下载文件---"+filename;
            //this.txtPath.Text = @"C:\Users\Administrator\Desktop";
            this.txtPath.Text = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory); 
        }

        FolderBrowserDialog folderBrowserDialog1 = new FolderBrowserDialog();
        private void btnScan_Click(object sender, EventArgs e)
        {
            
            if (this.folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                if (this.folderBrowserDialog1.SelectedPath.Trim() != "")
                    this.txtPath.Text = this.folderBrowserDialog1.SelectedPath.Trim();
            }
        }

        private void btnDownLoad_Click(object sender, EventArgs e)
        {
            bool Downl=DownloadFile(originalurl, this.txtPath.Text + @"\" + filename);//Application.StartupPath+@"\"+
            if (Downl)
            { MessageBox.Show("下载完成！"); }
            else
            { MessageBox.Show("下载失败！"); }
            this.Close();
            //this.Close();
            
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}