// Get an access token for the given context and resourceId. An attempt is first made to
// acquire the token silently. If that fails, then we try to acquire the token by prompting the user.
public static async Task <GraphServiceClient> GetAuthenticatedClientAsync()
{
if (graphClient == null)
{
var authenticationProvider = new OAuth2AuthenticationProvider(
new AppConfig
{
ClientId = clientId,
ReturnUrl = returnUrl,
Scopes = new string[]
{
"openid",
"offline_access",
"https://graph.microsoft.com/User.Read",
"https://graph.microsoft.com/Mail.Send",
},
});
await authenticationProvider.AuthenticateAsync();
graphClient = new GraphServiceClient(authenticationProvider);
}
return(graphClient);
}
// Get a Graph client.
public static async Task <GraphServiceClient> GetAuthenticatedClientAsync()
{
if (graphClient == null)
{
var authenticationProvider = new OAuth2AuthenticationProvider(
clientId,
returnUrl,
new string[]
{
"offline_access",
"https://graph.microsoft.com/Mail.Read",
});
await authenticationProvider.AuthenticateAsync();
graphClient = new GraphServiceClient(authenticationProvider);
}
return(graphClient);
}
