Enable FR StarTraining (Azure#11322)

* starttraining

* no null

sdk/formrecognizer/Azure.AI.FormRecognizer/src/FormTrainingClient.cs

@@ -58,22 +58,10 @@ public FormTrainingClient(Uri endpoint, AzureKeyCredential credential, FormRecog
         [ForwardsClientCalls]
         public virtual TrainingOperation StartTraining(Uri trainingFiles, bool useLabels = false, TrainingFileFilter filter = default, CancellationToken cancellationToken = default)
         {
-            throw new NotImplementedException();
-
-            //TrainRequest_internal trainRequest = new TrainRequest_internal() { Source = trainingFiles.AbsoluteUri };
-
-            //// TODO: Q1 - if there's a way to default a property value, set filter.Path ="" and set it here in a nicer way.
-            //// https://github.com/Azure/autorest.csharp/issues/467
-            //// When this is complete, we will be able to default filter.Path to "".
-            //// Decision to make, do we always send filter, or only if needed?
-            //// Tracking with https://github.com/Azure/azure-sdk-for-net/issues/10359
-            //if (filter != default)
-            //{
-            //    trainRequest.SourceFilter = filter;
-            //}
-
-            //ResponseWithHeaders<TrainCustomModelAsyncHeaders> response = ServiceClient.RestClient.TrainCustomModelAsync(trainRequest);
-            //return new TrainingOperation(ServiceClient, response.Headers.Location);
+            var trainRequest = new TrainRequest_internal(trainingFiles.AbsoluteUri, filter, useLabels);
+
+            ResponseWithHeaders<ServiceTrainCustomModelAsyncHeaders> response = ServiceClient.RestClient.TrainCustomModelAsync(trainRequest);
+            return new TrainingOperation(response.Headers.Location, ServiceClient);
         }
 
         /// <summary>
@@ -88,20 +76,10 @@ public virtual TrainingOperation StartTraining(Uri trainingFiles, bool useLabels
         [ForwardsClientCalls]
         public virtual async Task<TrainingOperation> StartTrainingAsync(Uri trainingFiles, bool useLabels = false, TrainingFileFilter filter = default, CancellationToken cancellationToken = default)
         {
-            await Task.Run(() => { }).ConfigureAwait(false);
-            throw new NotImplementedException();
-
-            //TrainRequest_internal trainRequest = new TrainRequest_internal() { Source = trainingFiles.AbsoluteUri };
-
-            //// TODO: Q1 - if there's a way to default a property value, set filter.Path ="" and set it here in a nicer way.
-            //// https://github.com/Azure/azure-sdk-for-net/issues/10359
-            //if (filter != default)
-            //{
-            //    trainRequest.SourceFilter = filter;
-            //}
+            var trainRequest = new TrainRequest_internal(trainingFiles.AbsoluteUri, filter, useLabels);
 
-            //ResponseWithHeaders<TrainCustomModelAsyncHeaders> response = await ServiceClient.RestClient.TrainCustomModelAsyncAsync(trainRequest).ConfigureAwait(false);
-            //return new TrainingOperation(ServiceClient, response.Headers.Location);
+            ResponseWithHeaders<ServiceTrainCustomModelAsyncHeaders> response = await ServiceClient.RestClient.TrainCustomModelAsyncAsync(trainRequest).ConfigureAwait(false);
+            return new TrainingOperation(response.Headers.Location, ServiceClient);
         }
 
         /// <summary>

sdk/formrecognizer/Azure.AI.FormRecognizer/src/TrainingFileFilter.cs

@@ -13,5 +13,12 @@ public partial class TrainingFileFilter
         internal TrainingFileFilter()
         {
         }
+
+        /// <inheritdoc />
+        public string Prefix { get; set; } = string.Empty;
+
+        /// <inheritdoc />
+        public bool IncludeSubFolders { get; set; } = false;
+
     }
 }