如何创建一个用户控件，显示来自 NotifyIcon 的气球提示，使用计时器以特定间隔重复?

Question

我正在创建一个在用户定义的时间创建通知的应用程序。

基本上我使用两种WinForms：

• 数字 1 用于获取通知数据并创建包含通知数据(如消息、标题、到期时间)NotificationObject类的新实例。
• Form2 用于跟踪通知。

当程序启动时，Form数字 2 打开，并且有一个按钮，我可以在其中打开数字 1Form。当表单编号 1 关闭时，它将通知数据保存到类NotificationObject。Form数字 2 获取在关闭数字 1Form时创建的NotificationObject并将其添加到ObservableCollection中。当某些东西被添加到ObservableCollection时，它会创建一个带有构造函数参数DueTime、Title和Message的UserControl。然后在UserControl内，我使用System.Threading.Timer和NotifyIcon来创建通知。

即使我已经设置了Callback方法来创建NotifyIcon气球，它也没有显示任何内容。

表格编号 1

public partial class NotificationCreator : Form
{
public NotificationObject ntfObj;

public NotificationCreator()
{
InitializeComponent();
}

private void createNotification_Click(object sender, EventArgs e)
{
if (String.IsNullOrEmpty(timeInput.Text))
{
MessageBox.Show(
"Please set the time.",
"Time is not set",
MessageBoxButtons.OK,
MessageBoxIcon.Error
);

return;
}

if (String.IsNullOrEmpty(titleInput.Text))
{
MessageBox.Show(
"Please set the title.",
"Title is not set",
MessageBoxButtons.OK,
MessageBoxIcon.Error
);

return;
}

if (String.IsNullOrEmpty(messageInput.Text))
{
MessageBox.Show(
"Please set the message.",
"Message is not set",
MessageBoxButtons.OK,
MessageBoxIcon.Error
);

return;
}

DateTime time = DateTime.Parse(timeInput.Text);

DateTime dt = new DateTime(dateInput.Value.Year,
dateInput.Value.Month,
dateInput.Value.Day,
time.Hour,
time.Minute,
0
);

ntfObj = new NotificationObject(dt, titleInput.Text, messageInput.Text);

Close();
Dispose();
}

private void timeInput_TextChanged(object sender, EventArgs e)
{
if (timeInput.Text.Length == 5)
{
try
{
DateTime dummy = DateTime.Parse(timeInput.Text);

if (dummy.Hour <= DateTime.Now.Hour && dummy.Minute <= DateTime.Now.Minute && dummy.Hour != 00 && dummy.Minute != 00)
{
MessageBox.Show("Please set the time for future",
"Invalid time",
MessageBoxButtons.OK,
MessageBoxIcon.Error);

return;
}

return;
}
catch
{
MessageBox.Show("Please set a valid time",
"Invalid time",
MessageBoxButtons.OK,
MessageBoxIcon.Error);
return;
}
}
}

private void dateInput_ValueChanged(object sender, EventArgs e)
{
if (dateInput.Value < DateTime.Now.AddDays(-1))
{
MessageBox.Show("Please set the date for future.",
"Invalid date",
MessageBoxButtons.OK,
MessageBoxIcon.Error);

dateInput.Value = DateTime.Now;

return;
}
}
}
}

表格编号 2

public partial class TrackingPanel : Form
{
ObservableCollection<NotificationObject> ntfList = new ObservableCollection<NotificationObject>();
public TrackingPanel()
{
InitializeComponent();
ntfList.CollectionChanged += NtfList_CollectionChanged;
}
private void NtfList_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Add)
{
NotificationObject ntfObj = e.NewItems[0] as NotificationObject;
Notification ntf = new Notification(ntfObj.DueTime, ntfObj.ntfTitle, ntfObj.ntfMessage);
ntfPanel.Controls.Add(ntf);
}
}
private void TrackingPanel_Load(object sender, EventArgs e)
{}
private void TrackingPanel_Resize(object sender, EventArgs e)
{
if (WindowState == FormWindowState.Minimized)
{}
}
private void createNotification_Click(object sender, EventArgs e)
{
NotificationCreator Tool = new NotificationCreator();
Tool.ShowDialog();
ntfList.Add(Tool.ntfObj);
}
}

通知对象

/// <summary>
/// An object that represents the Notification and contains Notification information.
/// </summary>
public class NotificationObject
{
/// <summary>
/// Notification due time.
/// </summary>
public DateTime DueTime { get; set; }
/// <summary>
/// Title of Notification.
/// </summary>
public string ntfTitle { get; set; }
/// <summary>
/// Notification Message.
/// </summary>
public string ntfMessage{ get; set; }
public NotificationObject(DateTime dueTime, string title, string message)
{
DueTime = dueTime;
ntfTitle = title;
ntfMessage = message;
}
}

用户控件

public partial class Notification : UserControl
{
private readonly System.Threading.Timer timer;
public Notification(DateTime dt, string Title, string Message)
{
InitializeComponent();
this.Title.Text = Title;
this.Message.Text = Message;
ntfIco.Visible = false;
timer = new System.Threading.Timer(NotificationOccurs, null, dt - DateTime.Now, TimeSpan.FromSeconds(20));
}
private void NotificationOccurs(object state)
{
ntfIco.Visible = true;
ntfIco.ShowBalloonTip(3500, Title.Text, Message.Text, ToolTipIcon.Info);
ntfIco.Visible = false;
}
private void Notification_Load(object sender, EventArgs e)
{
ntfPic.Image = Properties.Resources.Search_Png;
}
}

编辑

我在UserControl中使用了System.Windows.Forms.Timer，但仍然不起作用。

public partial class Notification : UserControl
{
public Notification(DateTime dt, string Title, string Message)
{
InitializeComponent();
this.Title.Text = Title;
this.Message.Text = Message;
ntfIco.Visible = false;
Timer.Interval = (int)(dt - DateTime.Now).TotalMilliseconds;
Timer.Start();

}
private void Notification_Load(object sender, EventArgs e)
{
ntfPic.Image = Properties.Resources.Search_Png;
}
private void Timer_Tick(object sender, EventArgs e)
{
ntfIco.Visible = true;
ntfIco.ShowBalloonTip(3500, Title.Text, Message.Text, ToolTipIcon.Info);
Timer.Interval = 10 * 1000;
ntfIco.Visible = false;
}
}

Answer 1

从评论讨论：

• 请务必设置通知图标的 Icon 属性。

• 保持 WinForms 计时器与 UI 线程正常。

• 不要在气球提示弹出后将可见的通知图标设置为 false，否则它会关闭。

• 让气球尖端自行褪色。

• 如果要隐藏通知图标，请在 BallonTipClosed 事件上执行此操作。

private void Timer_Tick(object sender, EventArgs e)
{
ntfIco.Visible = true;
ntfIco.ShowBalloonTip(3500, Title.Text, Message.Text, ToolTipIcon.Info);
Timer.Interval = 10 * 1000;
}

public Notification(DateTime dt, string Title, string Message)
{
InitializeComponent();
this.Title.Text = Title;
this.Message.Text = Message;
ntfIco.Visible = false;
ntfIco.BalloonTipClosed += (sender, e) => ntfIco.Visible = false;
Timer.Interval = (int)( dt - DateTime.Now ).TotalMilliseconds;
Timer.Start();
}