Get started with Microsoft Graph
https://developer.microsoft.com/en-us/graph/get-started
Step 1: App registrations in Azure Active Directory
Strep 2: C# code to read User Events
Step 1:
go to http://portal.azure.com/ click on 'Azure Active Directory'
Step 2: Code
https://developer.microsoft.com/en-us/graph/get-started
Step 1: App registrations in Azure Active Directory
Strep 2: C# code to read User Events
Step 1:
go to http://portal.azure.com/ click on 'Azure Active Directory'
click on 'App registration' -> 'New registration' to register new app.
provide required details in app registration page.
from below screen copy client id, tenant id to use in code.
go to 'app permission' -> 'add a permissions' -> 'Microsoft Graph' -> 'Application Permission' -> select below permissions:
Calendars.Read
Calendars.ReadWrite
User.Read
User.Read.All
click on 'Grant admin consent for ' -> click on OK
Click on 'Certification & Secrets' -> 'New client secret' -> provide required details -> click on 'Add' button.
make sure copy below secret now itself to use in code, later it is not visible.
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
namespace graph
{
public partial class WebForm1 : System.Web.UI.Page
{
private const string TenantId = "19d5137a-bf36-xxx";
private string
graphAccessUrl = "https://login.microsoftonline.com/" + TenantId + "/oauth2/v2.0/token";
private string clientId
= "f548e759-fe41-xxx";
private string
clientSecret = "e.e:7E=[QioQfFhTxxx";
private string
grant_type = "client_credentials";
private string scope = "https://graph.microsoft.com/.default";
private string
graphUrl_event = "https://graph.microsoft.com/v1.0/users/sreekanth@sreekanth07.onmicrosoft.com/events?startdatetime=2020-02-28T10:47:27.2680000&enddatetime=2020-02-29T10:47:27.2680000&$select=subject,body,bodyPreview,organizer,attendees,start,end,location,showAs";
private string
graphUrl_createEvent = "https://graph.microsoft.com/v1.0/users/sreekanth@sreekanth07.onmicrosoft.com/events";
private string
accessToken = string.Empty;
private JObject events = null;
protected async void Page_Load(object sender, EventArgs e)
{
accessToken = await GetAppOnlyAccessTokekn();
events = await GetEvents(accessToken);
string strEvent = await
CreateEvent(accessToken);
}
private async Task<string> GetAppOnlyAccessTokekn()
{
try
{
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(graphAccessUrl);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));
List<KeyValuePair<string, string>> values = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("grant_type", grant_type),
new KeyValuePair<string, string>("client_id", clientId),
new KeyValuePair<string, string>("client_secret", clientSecret),
new KeyValuePair<string, string>("scope", scope)
};
try
{
HttpContent httpContent
= new FormUrlEncodedContent(values);
HttpResponseMessage
response = await client.PostAsync(new Uri(graphAccessUrl), httpContent);
if (response.IsSuccessStatusCode)
{
string responseString = await
response.Content.ReadAsStringAsync();
Data reponseObj =
JsonConvert.DeserializeObject<Data>(responseString);
return reponseObj.access_token;
}
else
{
return null;
}
}
catch (Exception)
{
return null;
}
}
}
catch (Exception)
{
return null;
}
}
public async
Task<JObject> GetEvents(string accessToken)
{
try
{
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(graphUrl_event);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
try
{
HttpResponseMessage
response = await client.GetAsync(new Uri(graphUrl_event));
if (response.IsSuccessStatusCode)
{
string responseJSON = await
response.Content.ReadAsStringAsync();
JObject jObj =
JObject.Parse(responseJSON);
return jObj;
}
else
{
return null;
}
}
catch (Exception)
{
return null;
}
}
}
catch (Exception)
{
return null;
}
}
public async Task<string> CreateEvent(string accessToken)
{
try
{
using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(graphUrl_createEvent);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
client.DefaultRequestHeaders.Authorization
= new AuthenticationHeaderValue("Bearer", accessToken);
try
{
string body = "{\"subject\":\"My event
123\",\"start\":{\"dateTime\":\"2020-02-28T10:47:27.268Z\",\"timeZone\":\"UTC\"},\"end\":{\"dateTime\":\"2020-02-29T10:47:27.268Z\",\"timeZone\":\"UTC\"},\"location\":{\"displayName\":\"Harry's
Bar\"},\"attendees\":[{\"emailAddress\":{\"address\":\"user1@sreekanth07.onmicrosoft.com\",\"name\":\"user
1\"},\"type\":\"required\"},{\"emailAddress\":{\"address\":\"user2@sreekanth07.onmicrosoft.com\",\"name\":\"user
2\"},\"type\":\"required\"},{\"emailAddress\":{\"address\":\"user3@sreekanth07.onmicrosoft.com\",\"name\":\"user
3\"},\"type\":\"required\"}]}";
List<KeyValuePair<string, string>> values = new List<KeyValuePair<string, string>>
{
new KeyValuePair<string, string>("application/json", body)
};
HttpContent httpContent
= new StringContent(body, Encoding.UTF32,
"application/json");
HttpResponseMessage
response = await client.PostAsync(new Uri(graphUrl_createEvent),
httpContent);
if (response.IsSuccessStatusCode)
{
string responseJSON = await
response.Content.ReadAsStringAsync();
return responseJSON;
}
else
{
return null;
}
}
catch (Exception)
{
return null;
}
}
}
catch (Exception)
{
return null;
}
}
}
public class Data
{
public string
token_type { get; set; }
public string
expires_in { get; set; }
public string
ext_expires_in { get; set; }
public string
access_token { get; set; }
}
}
