C# progressbar 用法
最近由于工作的需要，开始接触c#，发现c#语言真的很强大，本人java出身，学起来没什么难度，但是做网络爬虫的时候遇到一个问题，就是c#的progressbar （进度条）
下面是我参考的内容，希望能有帮助：
原文摘自：http://www.cnblogs.com/kingwangzhen/archive/2010/01/23/1654925.html
http://www.cnblogs.com/tlnature/archive/2009/02/27/1399298.html
界面：
1 namespace ProgressBar_01 2 { 3 partial class Form1 4 { 5 /// <summary> 6 /// 必需的设计器变量。 7 /// </summary> 8 private System.ComponentModel.IContainer components = null; 9 10 /// <summary> 11 /// 清理所有正在使用的资源。 12 /// </summary> 13 /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> 14 protected override void Dispose(bool disposing) 15 { 16 if (disposing && (components != null)) 17 { 18 components.Dispose(); 19 } 20 base.Dispose(disposing); 21 } 22 23 #region Windows 窗体设计器生成的代码 24 25 /// <summary> 26 /// 设计器支持所需的方法 - 不要 27 /// 使用代码编辑器修改此方法的内容。 28 /// </summary> 29 private void InitializeComponent() 30 { 31 this.progressBar1 = new System.Windows.Forms.ProgressBar(); 32 this.label1 = new System.Windows.Forms.Label(); 33 this.button1 = new System.Windows.Forms.Button(); 34 this.label2 = new System.Windows.Forms.Label(); 35 this.label3 = new System.Windows.Forms.Label(); 36 this.SuspendLayout(); 37 // 38 // progressBar1 39 // 40 this.progressBar1.Location = new System.Drawing.Point(157, 142); 41 this.progressBar1.Name = "progressBar1"; 42 this.progressBar1.Size = new System.Drawing.Size(365, 35); 43 this.progressBar1.TabIndex = 0; 44 this.progressBar1.Click += new System.EventHandler(this.progressBar1_Click); 45 // 46 // label1 47 // 48 this.label1.AutoSize = true; 49 this.label1.Location = new System.Drawing.Point(98, 153); 50 this.label1.Name = "label1"; 51 this.label1.Size = new System.Drawing.Size(41, 12); 52 this.label1.TabIndex = 1; 53 this.label1.Text = "进度："; 54 this.label1.Click += new System.EventHandler(this.label1_Click); 55 // 56 // button1 57 // 58 this.button1.Location = new System.Drawing.Point(157, 217); 59 this.button1.Name = "button1"; 60 this.button1.Size = new System.Drawing.Size(75, 23); 61 this.button1.TabIndex = 2; 62 this.button1.Text = "提交"; 63 this.button1.UseVisualStyleBackColor = true; 64 this.button1.Click += new System.EventHandler(this.button1_Click); 65 // 66 // label2 67 // 68 this.label2.AutoSize = true; 69 this.label2.Location = new System.Drawing.Point(480, 124); 70 this.label2.Name = "label2"; 71 this.label2.Size = new System.Drawing.Size(0, 12); 72 this.label2.TabIndex = 3; 73 // 74 // label3 75 // 76 this.label3.AutoSize = true; 77 this.label3.Location = new System.Drawing.Point(397, 124); 78 this.label3.Name = "label3"; 79 this.label3.Size = new System.Drawing.Size(77, 12); 80 this.label3.TabIndex = 4; 81 this.label3.Text = "进度百分比："; 82 this.label3.Click += new System.EventHandler(this.label3_Click); 83 // 84 // Form1 85 // 86 this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 87 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 88 this.ClientSize = new System.Drawing.Size(604, 368); 89 this.Controls.Add(this.label3); 90 this.Controls.Add(this.label2); 91 this.Controls.Add(this.button1); 92 this.Controls.Add(this.label1); 93 this.Controls.Add(this.progressBar1); 94 this.Name = "Form1"; 95 this.Text = "Form1"; 96 this.ResumeLayout(false); 97 this.PerformLayout(); 98 99 } 100 101 #endregion 102 103 private System.Windows.Forms.ProgressBar progressBar1; 104 private System.Windows.Forms.Label label1; 105 private System.Windows.Forms.Button button1; 106 private System.Windows.Forms.Label label2; 107 private System.Windows.Forms.Label label3; 108 } 109 }
进度条处理：
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 10 namespace ProgressBar_01 11 { 12 public partial class Form1 : Form 13 { 14 public Form1() 15 { 16 InitializeComponent(); 17 } 18 19 private void progressBar1_Click(object sender, EventArgs e) 20 { 21 22 } 23 public void StartDownload() 24 { 25 Downloader downloader = new Downloader(); 26 downloader.onDownLoadProgress += new Downloader.dDownloadProgress(downloader_onDownLoadProgress); 27 downloader.Start(); 28 } 29 //同步更新UI 30 void downloader_onDownLoadProgress(long total, long current) 31 { 32 if (this.InvokeRequired) 33 { 34 this.Invoke(new Downloader.dDownloadProgress(downloader_onDownLoadProgress), new object[] { total, current }); 35 long test = current + 1; 36 label2.Text = test + "%"; 37 label2.Show(); 38 if (test == 100) 39 { 40 this.Close(); 41 MessageBox.Show("本次任务已完成\n 谢谢使用"); 42 } 43 } 44 else 45 { 46 this.progressBar1.Maximum = (int)total; 47 this.progressBar1.Value = (int)current; 48 } 49 } 50 public class Downloader 51 { 52 //委托 53 public delegate void dDownloadProgress(long total, long current); 54 //事件 55 public event dDownloadProgress onDownLoadProgress; 56 //开始模拟工作 57 public void Start() 58 { 59 for (int i = 0; i < 100; i++) 60 { 61 if (onDownLoadProgress != null) 62 onDownLoadProgress(100, i); 63 System.Threading.Thread.Sleep(100); 64 } 65 } 66 } 67 68 private void button1_Click(object sender, EventArgs e) 69 { 70 //用子线程工作 71 new System.Threading.Thread(new System.Threading.ThreadStart(StartDownload)).Start(); 72 } 73 } 74 }
运行实际效果：
1 private void btnRun_Click(object sender, EventArgs e) 2 { 3 btnRun.Enabled = false; 4 5 if (txtBoxTarget.Text.Equals(String.Empty) || txtBoxTimes.Text.Equals(String.Empty)) 6 { 7 MessageBox.Show("请输入连接的URL和连接次数！", "提示", 8 MessageBoxButtons.OK, MessageBoxIcon.Information); 9 return; 10 } 11 12 int length = Int32.Parse(txtBoxTimes.Text.Trim()); 13 string url = txtBoxTarget.Text.Trim(); 14 double process = 0; 15 int show = 0; 16 17 DateTime rightNow = DateTime.Now; 18 DateTime end; 19 TimeSpan interval; 20 21 22 toolStripStatusLabel.Text = "连接中"; 23 progressBar.Visible = true; 24 progressBar.Minimum = 0; 25 progressBar.Maximum = length; 26 27 for (int i = 1; i <= length; i++) 28 { 29 try 30 { 31 32 // 这两句是连接某个网页的。 33 WebRequest myRequest = WebRequest.Create(url); 34 WebResponse myResponse = myRequest.GetResponse(); 35 myResponse.Close(); 36 } 37 catch 38 { 39 txtBoxReport.Text = "网络连接有误！"; 40 return; 41 } 42 43 progressBar.PerformStep(); 44 45 process = i / length; 46 show = (int)process * 100; 47 } 48 49 progressBar.Visible = false; 50 toolStripStatusLabel.Text = "已就绪"; 51 txtBoxReport.Text = "连接 " + url + " " + length + "次。"; 52 53 end = DateTime.Now; 54 interval = end - rightNow; 55 txtBoxReport.Text += "\r\n共耗时" + interval.TotalMilliseconds + "毫秒。"; 56 57 btnRun.Enabled = true; 58 }
没有过多的讲解，因为这个我研究的不深，因为c#的牛人很多，但是我会把我的错误进行分享，以此为戒
