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  • Winform 下载文件进度条设计

    后台load事件 

    DownloadFile("http://localhost:2484/123.rar", @"C:\123.rar", progressBar1, label1);

     /// <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 void DownloadFile(string URL, string filename, System.Windows.Forms.ProgressBar prog, System.Windows.Forms.Label label1)
            {
                float  percent = 0;
                try
                {
                    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)
                    {
                        prog.Value = 0;
                        prog.Maximum = (int)totalBytes;
                    }
                    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)
                        {
                            prog.Value = (int)totalDownloadedByte;
                        }
                        osize = st.Read(by, 0, (int)by.Length);

                        percent = (float)totalDownloadedByte / (float)totalBytes * 100;
                        label1.Text = "当前补丁下载进度" + percent.ToString() + "%";
                        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();
                    MessageBox.Show("下载成功!");
                }
                catch (System.Exception ex)
                {
                    MessageBox.Show(ex.ToString(),"错误提示");
                }
            }


     

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  • 原文地址:https://www.cnblogs.com/swarb/p/9924431.html
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