If you have a table you can point ServiceFeatureTable to that and use QueryAsync to retrieve the data.
var serviceUri = new Uri("url to the table");
ServiceFeatureTable requestsFeatureTable = new ServiceFeatureTable(serviceUri);
requestsFeatureTable.FeatureRequestMode = FeatureRequestMode.OnInteractionCache;
await requestsFeatureTable.LoadAsync();
var results = await requestsFeatureTable.QueryFeaturesAsync(
new QueryParameters() { WhereClause = "1=1" }, QueryFeatureFields.LoadAll);
var firstRequest = results.First();