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How to: Send a Notification

  • Artykuł

You can use a Notification whenever a user should take action in your application, such as prompting to send data. Typically, you send a notification when an event occurs or a condition is met, but, for simplicity, this example displays a notification when a button is clicked. You can process responses to notifications by providing code to handle the ResponseSubmitted event.

The message in a notification can be plain text or HTML. HTML enables you to send a small HTML form that contains check boxes, buttons, lists, and other HTML elements. This example uses a simple form with Submit and Cancel buttons.

The Cancel button is identified by "cmd:2", which Windows CE uses to dismiss notifications. If cmd:2 is the name of an HTML button or other element in a message balloon, the ResponseSubmitted event is not raised. The notification is dismissed, but its icon is placed on the title bar and can be responded to at a later time.

To send a notification

  1. Create a Pocket PC Windows application.

  2. Add a Notification and a Button to the form.

  3. Create a Notification instance.

    Me.Notification1 = New Microsoft.WindowsCE.Forms.Notification

    this.notification1 = new Microsoft.WindowsCE.Forms.Notification();

  4. Add the following code to handle the Click event of the button.

    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click

    ' Use a StringBuilder for better performance. 
    Dim HTMLString As New StringBuilder

    HTMLString.Append("<html><body>")
    HTMLString.Append("Submit data?")
    HTMLString.Append("<form method=\'GET\' action=notify>")
    HTMLString.Append("<input type='submit'>")
    HTMLString.Append( _
        "<input type=button name='cmd:2' value='Cancel'>")
    HTMLString.Append("</body></html>")

    ' Set the Text property to the HTML string.
    Notification1.Text = HTMLString.ToString()

    Dim IconStream As New FileStream(".\My Documents\notify.ico", _
        FileMode.Open, FileAccess.Read)
    Notification1.Icon = new Icon(IconStream, 16, 16)
    Notification1.Caption="Notification Demo"
    Notification1.Critical = false

    ' Display icon up to 10 seconds.
    Notification1.InitialDuration = 10
    Notification1.Visible = true
End Sub

    private void button1_Click(object sender, System.EventArgs e)
{

    StringBuilder HTMLString = new StringBuilder();
    HTMLString.Append("<html><body>");
    HTMLString.Append("Submit data?");
    HTMLString.Append("<form method=\'GET\' action=notify>");
    HTMLString.Append("<input type='submit'>");
    HTMLString.Append("<input type=button name='cmd:2' value='Cancel'>");
    HTMLString.Append("</body></html>");

    //Set the Text property to the HTML string.
    notification1.Text = HTMLString.ToString();

    FileStream IconStream = new FileStream(".\\My Documents\\notify.ico",
        FileMode.Open, FileAccess.Read);
    notification1.Icon = new Icon(IconStream, 16, 16);
    notification1.Caption="Notification Demo";
    notification1.Critical = false;

    // Display icon up to 10 seconds.
    notification1.InitialDuration = 10;
    notification1.Visible = true;
}

  5. Add the following code to handle the ResponseSubmitted event.

    ' When a ResponseSubmitted event occurs, this event handler 
' parses the response to determine values in the HTML form. 
Private Sub Notification1_ResponseSubmitted(ByVal sender As Object, _
    ByVal resevent As Microsoft.WindowsCE.Forms.ResponseSubmittedEventArgs) _
    Handles Notification1.ResponseSubmitted

    If resevent.Response.Substring(0,6) = "notify" Then 
        ' Add code here to respond to the notification. 
    End If 

End Sub

    // When a ResponseSubmitted event occurs, this event handler 
// parses the response to determine values in the HTML form.
notification1.ResponseSubmitted += 
    delegate (object obj, ResponseSubmittedEventArgs resevent)
    {
        if (resevent.Response.Substring(0,6) == "notify")
        {
            // Add code here to respond to the notification.
        }
    };

Compiling the Code

This example requires references to the following namespaces:

See Also

Tasks

Notification Sample

Reference

Notification

Other Resources

Pocket PC Development and the .NET Compact Framework