Accessing google calendar api v3 in .net

Question

I'm trying to connect my asp.net (vb.net) app to google calendar so I can post events on google calendars.

So far, I've managed to get an access token, and refresh token. I plan on storing the refresh token so my app can access a particular google calendar long after the user has logged out.

So, i've got my access token and refresh token, now what? I can't find any examples where i can connect to google calendar api v3 with just an access token - all the examples, even on googles site, involve using the client library to get an access token (which i've already got), and creating a new CalendarService() object with no parameters passed.

Is it possible to create a CalendarService class and give it an access token i already have?

zxed zxed · Accepted Answer · 2013-12-19T17:47:01

It took a while to figure out the oauth workflow so I created a small project that had the basic concepts coded

Get access via oauth
refresh expired token
do some event using the access token

The project is hosted here https://code.google.com/p/csharp-googlecalendar-api-v3-oauth2/ and its in csharp BUT I did make it as simple as I could

You will probably want to look at this specific file https://code.google.com/p/csharp-googlecalendar-api-v3-oauth2/source/browse/CalChecker/simpleEvent.aspx.cs

string accesstoken = "usersaccesstoken";
string client_id = "getclientidfromcloud";
string client_secret = "getclientsecretfromcould";
string useremailaccount = "[email protected]";

var httpWebRequest1 = (HttpWebRequest)WebRequest.Create("https://www.googleapis.com/calendar/v3/calendars/" + WebUtility.HtmlEncode(useremailaccount) + "/events");
httpWebRequest1.ContentType = "text/json";
httpWebRequest1.Method = "GET";
httpWebRequest1.Headers["Authorization"] = "Bearer " + accesstoken;
var httpResponse1 = (HttpWebResponse)httpWebRequest1.GetResponse();
using (var streamReader = new StreamReader(httpResponse1.GetResponseStream()))
{
    var result = streamReader.ReadToEnd();
}

All the code is doing is creating a GET WebRequest, notice the Authorization Header.. Thats how you pass the access token to call an event that requires Auth.

Hope it helps

Accessing google calendar api v3 in .net

1 Answers