How Can BackgroundWorker Solve UI Freezes During Asynchronous Message Sending?

Use BackgroundWorker to send asynchronous messages

When the button is pressed to send a message, the program delays and freezes. In this case, using BackgroundWorker is an ideal solution. It allows asynchronous execution, ensuring program responsiveness even during message transmission. Here’s how to use it:

Replace the code in the button handler with:

<code>backgroundWorker1.RunWorkerAsync();</code>

In the backgroundWorker1_DoWork event handler, place the code responsible for sending the message. This ensures that these operations are performed in a background thread, allowing the program to continue running smoothly.

To update UI elements (such as a progress bar), use the backgroundWorker1_ProgressChanged event handler. This event is synchronized with the UI thread, allowing safe interaction.

In the backgroundWorker1_RunWorkerCompleted event handler, you can handle the completion of the message sending operation (if necessary).

The following is an example:

<code>public Form1()
{
    InitializeComponent();

    backgroundWorker1.DoWork += backgroundWorker1_DoWork;
    backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
    backgroundWorker1.WorkerReportsProgress = true;
}

private void button1_Click(object sender, EventArgs e)
{
    backgroundWorker1.RunWorkerAsync();
}

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    // 模擬耗時操作
    for (int i = 0; i < 100; i++)
    {
        // 發送訊息的程式碼
        System.Threading.Thread.Sleep(100); // 模擬延遲
        ((BackgroundWorker)sender).ReportProgress(i);
    }
}

private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
    // 更新 UI 元素
    progressBar1.Value = e.ProgressPercentage;
}

private void backgroundWorker1_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
{
    // 處理訊息發送完成
    MessageBox.Show("訊息發送完成！");
}</code>

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