\"User.Read\"<\/code>, \"Calendars.Read\"<\/code>, \"Calendars.ReadWrite\"<\/code>.\u00a0Once app registration is complete, make a note of the Client iD and URLs.<\/p>\nDisplaying Meetings<\/h2>\n
When the\u00a0user authenticates, a list of the last five meetings can be displayed on the page. The following XAML code example shows how this can be accomplished using a ListView:<\/p>\n
\n \n \n \n \n \n \n \n \n \n \n \n \n\n<\/pre>\n<\/code>\nThe OnAppearing()<\/code> override is executed when the page appears, as shown in the following code example:<\/p>\nprotected async override void OnAppearing()\n{\n base.OnAppearing();\n WelcomeText.Text = $\"Welcome {((User)App.Me).DisplayName}, your latest meetings:\";\n var client = new GraphServiceClient(\"https:\/\/graph.microsoft.com\/v1.0\",\n new DelegateAuthenticationProvider(\n async (requestMessage) =>\n {\n var tokenRequest = await App.IdentityClientApp.AcquireTokenSilentAsync(App.Scopes, App.IdentityClientApp.Users.FirstOrDefault());\n requestMessage.Headers.Authorization = new AuthenticationHeaderValue(\"bearer\", tokenRequest.AccessToken);\n })); \n var events = await client.Me.Events.Request().GetAsync();\n var list = events.ToList();\n MeetingsListView.ItemsSource = list.Take(5);\n}<\/pre>\nCreating Meetings<\/h2>\n
As well as displaying meetings, a mobile meeting app must be able to schedule meetings. This can be accomplished by using the DatePicker<\/code> and TimePicker<\/code> controls from Xamarin.Forms to set the meeting date and time. The following XAML code example shows a basic form for scheduling a meeting:<\/p>\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n<\/pre>\n<\/code>\nWhen the toolbar button is clicked, the following code is executed:<\/p>\n
private async void MenuItem_OnClicked(object sender, EventArgs e)\n {\n var calEvent = new Event\n {\n Subject = Subject.Text,\n Start = new DateTimeTimeZone\n {\n DateTime = StartDate.Date.Add(StartTime.Time).ToString(\"yyyy-MM-ddTHH:mm:ss\"),\n TimeZone = \"Asia\/Kolkata\"\n },\n End = new DateTimeTimeZone()\n {\n DateTime = EndDate.Date.Add(EndTime.Time).ToString(\"yyyy-MM-ddTHH:mm:ss\"),\n TimeZone = \"Asia\/Kolkata\"\n },\n Location = new Location() {DisplayName = Location.Text},\n Attendees = new List\n {\n new Attendee() {EmailAddress = new EmailAddress() {Address = Attendee.Text}},\n }\n };\n var client = new GraphServiceClient(\"https:\/\/graph.microsoft.com\/v1.0\",\n new DelegateAuthenticationProvider(\n async (requestMessage) =>\n {\n var tokenRequest = await App.IdentityClientApp.AcquireTokenSilentAsync(App.Scopes, App.IdentityClientApp.Users.FirstOrDefault());\n requestMessage.Headers.Authorization = new AuthenticationHeaderValue(\"bearer\", tokenRequest.AccessToken);\n }));\n await client.Me.Events.Request().AddAsync(calEvent);\n await DisplayAlert(\"Event added\", \"Calendar invite added and sent to attendees\", \"Ok\");\n }<\/pre>\nThe App<\/h3>\n
Once your code is complete, you can run the app and schedule meetings!<\/p>\n
![\"\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/44\/2019\/03\/Graph-API-Events.gif\")
<\/p>\n
Wrapping Up<\/h3>\n
The Microsoft Graph APIs allow you to send email and schedule meetings using unified app registration, among other functionality. Xamarin.Forms can consume these APIs, making it possible to build cross-platform apps to schedule meetings. You can find the sample used in this blog post on GitHub<\/a><\/p>\n