winform 加载窗体时弹出另一个窗体并显示进度条的源码

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//frmA: 源窗体 
//------------------------------------------
//引用 
using System.Threading;

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BackgroundWorker worker;    

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public frmA() 
{ 
    InitializeComponent();
 
    worker =new BackgroundWorker();
    worker.DoWork +=new DoWorkEventHandler(worker_DoWork);
    worker.RunWorkerCompleted +=new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
} 
 
/// <summary> 
/// 异步 开始事件 
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
privatevoid worker_DoWork(objectsender, DoWorkEventArgs e) 
{ 
    //需要执行的代码

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Thread.Sleep(5000); //让进程上卡5秒钟

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} 
 
 
 /// <summary>
 /// 事件: 异步执行完成后 
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 privatevoid worker_RunWorkerCompleted(objectsender, RunWorkerCompletedEventArgs e) 
 {
     MessageBox.Show("执行完成。","run", MessageBoxButtons.OK, MessageBoxIcon.Information);
 }
 
//点击一个按钮后开始执行
privatevoid btnA_Click(objectsender, EventArgs e) 
 {

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//按钮要执行的代码放在 worker_DoWork  事件中执行

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  //异步执行开始
worker.RunWorkerAsync();

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            //显示进度窗体
            frmB frm =new frmB(this.worker);
            frm.StartPosition = FormStartPosition.CenterScreen;
            frm.ShowDialog(this);
        }
  
frmB:  
//里面放了一个loading.gif图片显示进度
------------------------------------------------------------
using System; 
usingSystem.ComponentModel; 
usingSystem.Windows.Forms; 
  
namespacetest 
{ 
    publicpartial classfrmB: Form 
    {
        publicfrmB(BackgroundWorker worker) 
        {
            InitializeComponent();
            worker.ProgressChanged +=newProgressChangedEventHandler(worker_ProgressChanged); 
            worker.RunWorkerCompleted +=newRunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
        }
  
        voidworker_RunWorkerCompleted(objectsender, RunWorkerCompletedEventArgs e) 
        {
            this.Close();
        }
  
        voidworker_ProgressChanged(objectsender, ProgressChangedEventArgs e) 
        {
            //lblStatus.Text = "";
        }
  
        //工作完成后执行的事件  
        publicvoid OnProcessCompleted(objectsender, EventArgs e)   
        {
            this.Close();  
        } 
   
    }

　　二：在弹出的窗体里显示backgroundWorker的进度

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1, backgroundWorker1的WorkerReportsProgress属性设置为true
2, 写如下事件              
privatevoid backgroundWorker1_ProgressChanged(objectsender, ProgressChangedEventArgs e) 
        {
             progressBar.Value = e.ProgressPercentage;   
     }  
  
progressBar是进度条是你定义的变量..可以写在后台执行里面控制
3 .在后台执行里面 
 backgroundWorker1.ReportProgress(50);
其中50就是进度调的百分比.
比如一个循环循环100次 
没次backgroundWorker1.ReportProgress(循环次数);
那么效果出来 。。 哈哈

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