申请是否有效

Question

我应该如何知道应用程序是否正在运行或处理某些内容？让我们说我正在尝试将大量数据写入文件,那时应用程序没有响应.我想知道应用程序的当前状态.

Answer 1

使用BackgroundWorker组件在后台线程中处理大量数据.通过ProgressChanged事件通知用户进度.

样品:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        backgroundWorker1.WorkerReportsProgress = true;
    }

    private void WriteDataButton_Click(object sender, EventArgs e)
    {
        backgroundWorker1.RunWorkerAsync();
    }

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
         for (int i = 1; i <= numberOfIterations; i++)
         {
             // write part of data
             backgroundWorker1.ReportProgress(i * 100 / numberOfIterations);
         }    
    }

    // This event handler updates the progress. 
    private void backgroundWorker1_ProgressChanged(
                object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
    }

    // This event handler deals with the results of the background operation. 
    private void backgroundWorker1_RunWorkerCompleted(
                object sender, RunWorkerCompletedEventArgs e)
    {
        MessageBox.Show("Huge data was written");
    }
}