(Mono C#) OneDrive -- List Large Directory

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Demonstrates how to get the entire collection of DriveItem children when the collection is large and multiple pages need to be requested. To test this example, I created a DriveItem with 450 children.

Note: This example requires Chilkat v9.5.0.97 or greater.

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

// This example uses the OAuth client credentials flow.
// See How to Create an Azure App Registration for OAuth 2.0 Client Credentials

// Use your client ID, client secret, and tenant ID in the following lines
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("client_id","2871da2c-8176-4b7f-869b-2311aa82e743");
json.UpdateString("client_secret","2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH");
json.UpdateString("scope","https://graph.microsoft.com/.default");
json.UpdateString("token_endpoint","https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token");

Chilkat.Http http = new Chilkat.Http();
http.AuthToken = json.Emit();

// This example will get the DriveItems in /lots-of-files, which has 450 children..
http.SetUrlVar("item_path","/lots-of-files");
http.SetUrlVar("user_id","4fe732c3-322e-4a6b-b729-2fd1eb5c6104");

string resp;
int i;
int numItems;

json.EmitCompact = false;

// This loop will download DriveItems in sets of 25 until no more exist.
bool bGetMore = true;
// (Add the $top query parameter to define the page size, i.e. the max number of results to return).
string nextLink = "https://graph.microsoft.com/v1.0/users/{$user_id}/drive/root:{$item_path}:/children?$top=25";

while ((bGetMore == true)) {

    // Get the next chunk of DriveItems
    resp = http.QuickGetStr(nextLink);
    if (http.LastMethodSuccess != true) {
        Debug.WriteLine(http.LastErrorText);
        return;
    }

    // The response should be JSON.
    json.Load(resp);

    // A successful response should return a status code of 200.
    if (http.LastStatus != 200) {
        Debug.WriteLine(json.Emit());
        Debug.WriteLine("Response status = " + Convert.ToString(http.LastStatus));
        return;
    }

    // Iterate over the DriveItems in the JSON response:
    i = 0;
    numItems = json.SizeOfArray("value");
    while (i < numItems) {
        json.I = i;
        Debug.WriteLine("name: " + json.StringOf("value[i].name"));
        i = i + 1;
    }

    // If a nextLink was included in the JSON, use it to get the next set of 50 DriveItems.
    // Otherwise, exit the loop.
    if (json.HasMember("\"@odata.nextLink\"") == true) {
        nextLink = json.StringOf("\"@odata.nextLink\"");
        Debug.WriteLine("nextLink: " + nextLink);
    }
    else {
        bGetMore = false;
    }

}