Working With Contacts in Windows Phone 7

Now we will add some code to the code behind page for querying the data from the contacts database. To do that go to the button click event and write the code below. Basically the Windows Phone 7 Emulator has some default contacts which can be tested by pulling to the list in this article. We need to add the namespace in order to access the data.

Now in the button click event add the below code. From the code we can see the Contact class been used to query the details. Here we will be using the SearchAsyc method to do the search with the object and provide the result set to the list as shown in the code below.

C# Code

private void btnContacts_Click(object sender, RoutedEventArgs e)
{
Contacts cContacts = new Contacts();
cContacts.SearchCompleted += new EventHandler<ContactsSearchEventArgs>(ContactsSearch);
cContacts.SearchAsync(String.Empty, FilterKind.DisplayName, null);
}
void ContactsSearch(object sender, ContactsSearchEventArgs e)
{
try
{
lstcontacts.DataContext = e.Results;
}
catch (System.Exception)
{
txtResults.Text = "No Results Available";
}
if (lstcontacts.Items.Any())
{
txtResults.Text = "Below is the List of Contacts";
}
else
{
txtResults.Text = "No Results Available";
}
}

In the above code if we see we are querying the contacts class object and bind it to the list box using the data context and do some small user information with the message. In the SearchAsync method we provide different filters that can be used to access the data. Below is the list of filters that can be provided based on the requirement.

• Search All Contacts - SearchAsync(String.Empty, FilterKind.None, null).
• Get Pinned Contacts - SearchAsync(String.Empty, FilterKind.PinnedToStart, null).
• Search by Display Name - SearchAsync("Karthik", FilterKind.DisplayName, null).
• Search by Email ID - SearchAsync("[email protected]", FilterKind.EmailAddress, null).
• Search by Phone No - SearchAsync("123-456-7890″, FilterKind.PhoneNumber, null).

Now we are done with the application just to build and execute the application to check in the emulator press F5 or click on Build and execute the solution. We can see the end result by pressing the button once the application is loaded as shown in the screen below.

The list of contacts which are shown in the above screen is the default contacts available with the Emulator for testing purposes. We can use these contacts to do the testing and add or delete it based on the requirement.

Conclusion

So in this article we have seen how to use the contacts data search using the AddressChoosertask and list the data to the list view.