Rebex Graph

.NET client library for MS Graph API (Exchange Online)

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Advanced features

Impersonate another user

Impersonation makes it possible to use one account to log into the Exchange server, but then act on behalf of a different user. To request impersonation, use GraphClient.Settings.Impersonation property:

// create Graph client instance, connect, log in
// ...

// impersonate the 'other' user
client.Settings.Impersonation = new GraphImpersonation("other@example.org");

// work with impersonated mailbox as usual
var otherMessages = client.GetMessageList(GraphFolderId.Inbox);

To switch back to the logged-on user, disable impersonation by setting GraphClient.Settings.Impersonation property to null:

// turn impersonation off
client.Settings.Impersonation = null;

Accessing shared mailboxes

To perform operations on a shared mailbox (or another mailbox), impersonate the shared mailbox:

// create Graph client instance, connect
// ...

// login with user's OAuth access token
client.Login(token);

// impersonate a shared mailbox using its address
client.Settings.Impersonation = new GraphImpersonation("shared@example.org");

// work with shared mailbox as usual
var sharedMessages = client.GetMessageList(GraphFolderId.Inbox);

Advanced searching

You can perform a fulltext search on a folder using GraphSearchQuery. Either pass the string to search for, or write a graph $search query:

// create Graph client instance, connect, log in
// ...

// find top page of messages including string 'Order' anywhere
var query = new GraphMessageSearchQuery()
{
    RawSearch = "Order"
};
var orders = client.Search(GraphFolderId.Inbox, query);

// print some info about found messages
foreach (GraphMessageInfo info in orders)
{
    Console.WriteLine("[{0}] {1}", info.ReceivedDate, info.Subject);
}