1.第一种方法:直接实现
(1)界面
(2)设计一个按钮事件
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private void button1_Click(object sender, EventArgs e)
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{
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progressBar1.Value = 0; //清空进度条
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for (int i = 0; i < 100; i++)
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{
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progressBar1.Value += 1;
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textBox1.AppendText("当前进度:%" + i.ToString() + "\r\n");
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Thread.Sleep(50);
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}
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}
结果为:
2.第二种方法:子窗体实现
(1)先定义一个进度条窗体progressForm.cs,添加函数
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public void AddProgress()
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{
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progressBar1.Value++;
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label1.Text = progressBar1.Value.ToString() + "%";
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label1.Refresh();
(2)主窗体添加一个按钮事件
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private void button1_Click(object sender, EventArgs e)
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{
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progressForm progress = new progressForm();
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progress.Show();
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for (int i = 0; i < 100; i++)
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{
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progress.AddProgress();
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Thread.Sleep(50); // 毫秒ms
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}
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progress.Close();
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}
结果如下:
(3)第三种方法:线程实现
效果如下:
步骤如下:
首先定义一个代理用于更新ProgressBar的值(Value)及在执行方法的时候,返回方法的处理信息。
private delegate void SetPos(int ipos,string vinfo);//代理
相关实现函数如下
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private void button1_Click(object sender, EventArgs e)
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{
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Thread fThread = new Thread(new ThreadStart(SleepT));
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fThread.Start();
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}
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//定义新的线程执行函数
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private void SleepT()
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{
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for (int i = 0; i < 500; i++) //滚动条最大值为500
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{
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System.Threading.Thread.Sleep(10);
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SetTextMsg(100 * i / 500, i.ToString() + "\r\n");
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}
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}
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//进度条值更新函数(参数必须跟声明的代理参数一样)
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private void SetTextMsg(int ipos, string vinfo)
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{
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if (this.InvokeRequired) //InvokeRequired属性为真时,说明一个创建它以以外的线程(即SleepT)想访问它
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{
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SetPos setpos = new SetPos(SetTextMsg);
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this.Invoke(setpos, new object[] { ipos, vinfo });//SleepT线程调用本控件Form1中的方法
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}
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else
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{
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this.label1.Text = ipos.ToString() + "/100";
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this.progressBar1.Value = Convert.ToInt32(ipos);
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this.textBox1.AppendText(vinfo);
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}
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}
以上三种情况都会产生程序假死,即在进度条运行时不能点击。
4.第四种方法:BackgroundWorker控件实现,不会假死
BackgroundWorker可在单独的线程上执行操作
步骤如下:
(1)主窗体设计,为主窗体添加一个BackgroundWorker控件和按钮控件
(2)主窗体后台代码Form1.cs
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namespace progress_backgroundworker
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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this.backgroundWorker1.WorkerReportsProgress = true; //设置能报告进度更新
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this.backgroundWorker1.WorkerSupportsCancellation = true; //设置支持异步取消
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}
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private void button1_Click(object sender, EventArgs e)
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{
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this.backgroundWorker1.RunWorkerAsync(); //运行backgroundWorker组件
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ProgressForm form = new ProgressForm(this.backgroundWorker1); //显示进度条窗体
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form.ShowDialog(this);
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form.Close();
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}
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//在另一个线程上开始运行(处理进度条)
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private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
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{
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BackgroundWorker worker = sender as BackgroundWorker;
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for (int i = 0; i < 100; i++)
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{
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System.Threading.Thread.Sleep(100);
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worker.ReportProgress(i);
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if (worker.CancellationPending) //获取程序是否已请求取消后台操作
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{
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e.Cancel = true;
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break;
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}
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}
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}
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private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
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{
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if (e.Error != null)
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{
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MessageBox.Show(e.Error.Message);
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}
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else if (e.Cancelled)
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{
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MessageBox.Show("取消");
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}
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else
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{
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MessageBox.Show("完成");
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}
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}
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-
-
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}
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}
(3)子窗体设计
(4)子窗体代码实现ProgressForm.cs
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namespace progress_backgroundworker
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{
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public partial class ProgressForm : Form
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{
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private BackgroundWorker backgroundWorker1; //ProgressForm窗体事件(进度条窗体)
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public ProgressForm(BackgroundWorker bgWork)
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{
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InitializeComponent();
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// add my code
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this.backgroundWorker1 = bgWork;
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//绑定进度条改变事件
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this.backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
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//绑定后台操作完成,取消,异常时的事件
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this.backgroundWorker1.RunWorkerCompleted += new RunWorkerCompletedEventHandler(backgroundWorker1_RunWorkerCompleted);
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}
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void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
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{
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this.progressBar1.Value = e.ProgressPercentage; //获取异步任务的进度百分比
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}
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void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
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{
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//this.Close(); //执行完之后,直接关闭页面
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}
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//取消
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private void btnCancel_Click(object sender, EventArgs e)
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{
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this.backgroundWorker1.CancelAsync(); //请求取消挂起的后台操作
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this.btnCancel.Enabled = false;
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this.Close();
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}
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}
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}
效果如下
更多内容见参考资料
https://blog.csdn.net/ym296900664/article/details/52192289
https://www.cnblogs.com/xwzLoveCshap/p/9271592.html
圆形进度条实现
https://jingyan.baidu.com/article/eae0782742aa9d1fec54852f.html