(.NET Core C#) Outlook -- Get Number of Emails

Gets the number of emails in an Outlook folder. This uses the OData $count system query option. See OData System Query Option $count for general information.

This example first gets the combined total number of messages across all folders.

Note: This example requires Chilkat v9.5.0.68 or greater.

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

// Use your previously obtained access token here:
// See the following examples for getting an access token:
//    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
//    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
//    Refresh Access Token (Azure AD v2.0 Endpoint).
//    Refresh Access Token (Azure AD Endpoint).

http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN";

Chilkat.StringBuilder sbResponse = new Chilkat.StringBuilder();

// This gets the combined total number of emails in all folders.
bool success = http.QuickGetSb("https://graph.microsoft.com/v1.0/me/messages/$count",sbResponse);
if ((success != true) && (http.LastStatus == 0)) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.EmitCompact = false;

// If the status code was not 200, then it failed and the response is likely JSON:
if (http.LastStatus != 200) {
    Debug.WriteLine("Status code = " + Convert.ToString(http.LastStatus));
    json.LoadSb(sbResponse);
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed.");
    return;
}

// A success response payload contains just the integer value (it is not JSON)
Debug.WriteLine("Combined Total Number of Emails = " + sbResponse.GetAsString());
Debug.WriteLine("--");

// ---------------------------------------------------------------------------
// To get the number of emails in a particular folder, we need to use the folder id.
// 

// In this example, we'd like to get number of messages in the folder "/Inbox/abc",
// but we must specify the corresponding folder_id.  The best way to do this is to create
// a local map of folderPaths-to-folderIds.
// We'll use the map created by this example:  Create Outlook Folder Map)
Chilkat.Hashtable htFolderMap = new Chilkat.Hashtable();
Chilkat.StringBuilder sbMap = new Chilkat.StringBuilder();
sbMap.LoadFile("qa_data/outlook/folderMap.xml","utf-8");
htFolderMap.AddFromXmlSb(sbMap);

// Get the ID for the "/Inbox/abc" folder:
string folderId = htFolderMap.LookupStr("/Inbox/abc");
if (htFolderMap.LastMethodSuccess != true) {
    Debug.WriteLine("Folder ID not found");
    return;
}

http.SetUrlVar("folder_id",folderId);

// Send the request get the folder information.
// In this case we are NOT using the $count system query option.
success = http.QuickGetSb("https://graph.microsoft.com/v1.0/me/mailFolders/{$folder_id}",sbResponse);
if ((success != true) && (http.LastStatus == 0)) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

json.LoadSb(sbResponse);
Debug.WriteLine(json.Emit());
Debug.WriteLine("--");

if (http.LastStatus != 200) {
    Debug.WriteLine("Status code = " + Convert.ToString(http.LastStatus));
    Debug.WriteLine("Failed.");
    return;
}

// The successful JSON response looks like this;

// 	{
// 	  "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('me')/mailFolders/$entity",
// 	  "id": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAL8huv8AAAA=",
// 	  "displayName": "abc",
// 	  "parentFolderId": "AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgAuAAADsVyfxjDU406Ic4X7ill8xAEA5_vF7TKKdE6bGCRqXyl2PQAAAgEMAAAA",
// 	  "childFolderCount": 2,
// 	  "unreadItemCount": 0,
// 	  "totalItemCount": 3
// 	}
// 

// Get the integer value from the JSON like this:
int totalItemCount = json.IntOf("totalItemCount");
Debug.WriteLine("totalItemCount = " + Convert.ToString(totalItemCount));

int childFolderCount = json.IntOf("childFolderCount");
Debug.WriteLine("childFolderCount = " + Convert.ToString(childFolderCount));

// etc..