C# 来自其他窗体的计时器未停止

建筑

我有一个

ParentForm

和一个

面板

，其中包含

子表单

遇到的问题

我想从

子窗体

停止

父窗体

的计时器，但计时器从未停止

我试过的

---

在子窗体中创建事件并在父窗体中订阅事件。单击子窗体中的按钮将引发事件。在父窗体上的事件处理程序中，停止计时器

ParentForm.cs

public partial class ParentForm : Form
{
    ChildForm childForm = null;

    public ParentForm()
    {
        InitializeComponent();
    }

    private void ParentForm_Load(object sender, EventArgs e)
    {
        timer1.Start();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        toolStripStatusLabel2.Text = DateTime.Now.ToString("HH:mm:ss");
        statusStrip1.Refresh();
    }

    private void btnOpenChildForm_Click(object sender, EventArgs e)
    {
        if (childForm == null || childForm.IsDisposed)
        {
            childForm = new ChildForm();

            //subscribe to events
            childForm.FormClosed += ChildForm_FormClosed;
            childForm.StopTimerButtonClicked += ChildForm_StopTimerButtonClicked;
            
            childForm.Show();
        }
        else
        {
            childForm.WindowState = FormWindowState.Normal;
            childForm.Activate();
        }
        
    }

    private void ChildForm_FormClosed(object sender, FormClosedEventArgs e)
    {
        //unsubscribe from events
        childForm.FormClosed -= ChildForm_FormClosed;
        childForm.StopTimerButtonClicked -= ChildForm_StopTimerButtonClicked;

        childForm = null;
    }

    private void ChildForm_StopTimerButtonClicked(object sender, bool e)
    {
        //stop timer
        timer1.Stop();
    }
}

public partial class ChildForm : Form
{
    public delegate void EventHandlerStopTimerButtonClicked(object sender, bool e);


    //event that subscribers can subscribe to
    public event EventHandlerStopTimerButtonClicked StopTimerButtonClicked;

    public ChildForm()
    {
        InitializeComponent();
    }

    private void btnStop_Click(object sender, EventArgs e)
    {
        if (StopTimerButtonClicked != null)
        {
            //raise event
            StopTimerButtonClicked(this, true);
        }
    }
}

ChildForm.cs

public partial class ParentForm : Form
{
    ChildForm childForm = null;

    public ParentForm()
    {
        InitializeComponent();
    }

    private void ParentForm_Load(object sender, EventArgs e)
    {
        timer1.Start();
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        toolStripStatusLabel2.Text = DateTime.Now.ToString("HH:mm:ss");
        statusStrip1.Refresh();
    }

    private void btnOpenChildForm_Click(object sender, EventArgs e)
    {
        if (childForm == null || childForm.IsDisposed)
        {
            childForm = new ChildForm();

            //subscribe to events
            childForm.FormClosed += ChildForm_FormClosed;
            childForm.StopTimerButtonClicked += ChildForm_StopTimerButtonClicked;
            
            childForm.Show();
        }
        else
        {
            childForm.WindowState = FormWindowState.Normal;
            childForm.Activate();
        }
        
    }

    private void ChildForm_FormClosed(object sender, FormClosedEventArgs e)
    {
        //unsubscribe from events
        childForm.FormClosed -= ChildForm_FormClosed;
        childForm.StopTimerButtonClicked -= ChildForm_StopTimerButtonClicked;

        childForm = null;
    }

    private void ChildForm_StopTimerButtonClicked(object sender, bool e)
    {
        //stop timer
        timer1.Stop();
    }
}

public partial class ChildForm : Form
{
    public delegate void EventHandlerStopTimerButtonClicked(object sender, bool e);


    //event that subscribers can subscribe to
    public event EventHandlerStopTimerButtonClicked StopTimerButtonClicked;

    public ChildForm()
    {
        InitializeComponent();
    }

    private void btnStop_Click(object sender, EventArgs e)
    {
        if (StopTimerButtonClicked != null)
        {
            //raise event
            StopTimerButtonClicked(this, true);
        }
    }
}

---

您正在创建一个新的父窗体，而不是获取现有的父窗体。您可以编写如下内容：

（this.ParentForm作为[parent form class]）。[Timer Instance].Stop（）

。当然，计时器需要是公共的，

StopButton

类需要知道其父类的类型。不太好。单击按钮时，

StopButton

可能引发公共事件，让创建

StopButton

的表单订阅此事件并在其处理程序中停止计时器。或者使用界面。使

ParentForm

类实现定义

StopTimer（）

方法的已知/公共接口。在

StopButton

中，检查

this.ParentForm

是否实现了该接口，如果实现了，则强制转换该接口并调用该方法。--您可能应该使用UserControls而不是Forms（只是IMO）。非常感谢大家的帮助。它完全有效，@Jimi！我现在要实现

接口

和

用户控件

。很好的建议，你太好了。我只是在学习如何正确使用它。@user9938，你的很完美！谢谢你教我，我希望它将来能帮助别人。我祝你一切顺利。