用c#暂停图像

本文关键字：图像 暂停 | 更新日期: 2023-09-27 18:01:50

我想制作一个程序，每5秒显示一个图像，然后暂停1秒，然后显示下一个，但我有一个问题暂停图像。如果我有消息框代码，它停止显示图像，我必须按确定继续，但如果不是没有显示图像，它跳转到最后一个图像。请帮忙，我要在我的代码中添加什么才能正常工作?

private void button1_Click(object sender, EventArgs e)
{
    string[] arr1 =
        new string[] { "water", "eat", "bath", "tv", "park", "sleep" };
    for (int i = 0; i < 6; i++)
    {
        button1.BackgroundImage = 
            (Image)Properties.Resources.ResourceManager.GetObject(arr1[i]);
        new SoundPlayer(Properties.Resources.nero).Play();
        MessageBox.Show(arr1[i].ToString());
        Thread.Sleep(5000);
    }
}

用c#暂停图像

问题是UI线程没有机会更新显示。即:图像被显示，但是UI不更新。

一个不太好的方法是使用Application.DoEvents让UI像这样自我更新:

for (int i = 0; i < 6; i++)
{
    button1.BackgroundImage = (Image)Properties.Resources.ResourceManager.GetObject(arr1[i]);
    Application.DoEvents();
    new SoundPlayer(Properties.Resources.nero).Play();
    Thread.Sleep(5000);
}

另一个(更干净)的解决方案是改变你的逻辑，这样当按下按钮时，计时器开始改变图片，每5秒运行一次。我假设你正在使用Windows窗体，所以你可以放置一个名为timer的Timer在你的窗体上，附加一个事件处理程序到Elapsed事件，然后使用这个:

// These are instance members outside any methods!!
private int currentImageIndex = 0;
string[] arr1 = new string[] { "water", "eat", "bath", "tv", "park", "sleep" };
private void button1_Click(object sender, EventArgs e)
{
    // EDIT: As per comments changed to turn the button into a Start/Stop button.
    //       When the button is pressed and the timer is stopped, the timer is started,
    //       otherwise it is started.
    // Stop the timer if it runs already
    if (timer.Enabled)
    {
        timer.Stop();
    }
    // Start the timer if it was stopped
    else
    {
        // Make the timer start right away
        currentImageIndex = 0;
        timer.Interval = 1;
        // Start the timer
        timer.Start();
    }
}

在计时器事件中，使用以下代码:

private void timer_Tick(object sender, EventArgs e)
{    
    timer.Stop();
    try
    {
        timer.Interval = 5000; // Next time, wait 5 secs
        // Set the image and select next picture
        button1.BackgroundImage = (Image)Properties.Resources.ResourceManager.GetObject(arr1[currentImageIndex]);
        currentImageIndex++;
    }
    finally
    {
        // Only start the timer if we have more images to show!
        if (currentImageIndex < arr1.Length)   
            timer.Start();
    }
}

做到这一点的最好方法是与计时器控件结合使用。将计时器的间隔设置为1秒，但初始设置为禁用。然后按下按钮代码就可以简单地启用定时器。

public partial class MyForm : Form
{
    private int ImagePosition = 0;
    private string[] arr1 = new string[] { "water", "eat", "bath", "tv", "park", "sleep" };
    private void button1_Click(object sender, EventArgs e)
    {
        ImagePosition = 0;
        RotateImage();
        Timer1.Start();      
    }
    private void RotateImage()
    {
        button1.BackgroundImage = 
        (Image)Properties.Resources.ResourceManager.GetObject(arr1[ImagePosition]);
        new SoundPlayer(Properties.Resources.nero).Play();
        ImagePosition++;
    }
    private void timer1_Tick(object sender, EventArgs e)
    {
        if (ImagePosition > 5)
        {
            timer1.Enabled = false;
            return;
        }
        RotateImage();
    }
}
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