#1 How to perform email tasks in a WP7 app

published on: 10/29/2010 | Views: N/A | Tags: Tasks

by WindowsPhoneGeek

This post is the first in a series of  articles covering the WP7 Launcher and Choosers APIs.  In my previous post I explained everything you need to know about the different phone tasks.  Now it is time to focus on how to perform email manipulations with : SaveEmailAddressTask, EmailAddressChooserTask and EmailComposeTask .
It is a pretty common scenario for a phone app to :

• compose email

• send emails

• add new email address to the contact details

• select email address from the existing ones.

 

SaveEmailAdress to the contact details

This task can be acomplish by the SaveEmailAddressTask  Class :
     Namespace:  Microsoft.Phone.Tasks
     Assembly:  Microsoft.Phone (in Microsoft.Phone.dll)

It allows your application to launch the Contacts application and enables users to save a new  email address to the Contacts list. This is done by calling the Show() method of the SaveEmailAddressTask  object. You can Obtain the result of the chooser operation by handling the Completed event.

Example:
SaveEmailAddressTask saveEmailAddressTask;

this.saveEmailAddressTask = new SaveEmailAddressTask();
            this.saveEmailAddressTask.Completed += new EventHandler<TaskEventArgs>(saveEmailAddressTask_Completed);

private void btnSaveAddress_Click(object sender, RoutedEventArgs e)
        {
            saveEmailAddressTask.Email = "testmail@test.com";
            saveEmailAddressTask.Show();
        }

private void saveEmailAddressTask_Completed(object sender, TaskEventArgs e)
        {
            if (e.TaskResult == TaskResult.OK)
            {
                MessageBox.Show("Email successfully Saved..");
            }
        }
You can always manipulate the current SaveEmailAddressTask  through its defaultfault properties/methods.

Choose EmailAdress from the existing ones

Choosing email address from the existing ones can be just so easily implemented through the EmailAddressChooserTask. It launches the phone Contacts application and allows the user to select particular email address.

Example:

EmailAddressChooserTask emailAddressChooserTask;

this.emailAddressChooserTask = new EmailAddressChooserTask();
            this.emailAddressChooserTask.Completed += new EventHandler<EmailResult>(emailAddressChooserTask_Completed);

private void btnChoseEmailAddress_Click(object sender, RoutedEventArgs e)
        {
            emailAddressChooserTask.Show();
        }

        private void emailAddressChooserTask_Completed(object sender, EmailResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {
                MessageBox.Show("Selected email :" + e.Email);
            }
        }

Composing email

The third  launcher (EmailComposeTask) allows  you to send email from your application by launching the Email application which displays a new email message. It expects the mail address which could be provided just as a string, but in- real world application user expect to select it from his contacts and if not found enter manually.

Example 1:
private void emailAddressChooserTask_Completed(object sender, EmailResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {
                MessageBox.Show("Selected email :" + e.Email);
        
                //in-real world application user expect to select it from his contacts and if not found enter manually.
                //EmailComposeTask emailComposeTask = new EmailComposeTask();
                //emailComposeTask.To = e.Email;
                //emailComposeTask.To = saveEmailAddressTask.Email;
                //emailComposeTask.Body = "WP7 Emails Demo";
                //emailComposeTask.Cc = "testmail2@test.com";
                //emailComposeTask.Subject = "Windows Phone 7";
                //emailComposeTask.Show();
            }
        }

Example 2:
private void composeMail_Click(object sender, RoutedEventArgs e)
        {
            EmailComposeTask emailComposeTask = new EmailComposeTask();
            emailComposeTask.To = "chris@example.com";
            emailComposeTask.To = saveEmailAddressTask.Email;
            emailComposeTask.Body = "WP7 Emails Demo";
            emailComposeTask.Cc = "testmail2@test.com";
            emailComposeTask.Subject = "Windows Phone 7";
            emailComposeTask.Show();
        }

Note: Unfortunately some Launchers don't work in the emulator.  For example, the EmailComposeTask assumes you have an email account set up on the device.  Because the emulator prevents you from creating email accounts, you won't be able to test this.

That was all about performing email manipulations in a WP7 App. You can download the full source code of this article here.

In the next post I will talk about PhotoChooserTask  and CameraCaptureTask.

You can also follow us on Twitter @winphonegeek

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