Check exception status even if TF_SessionRun throws an exception (#4755)

Author: sharwell

src/Microsoft.ML.TensorFlow/TensorflowUtils.cs

@@ -3,7 +3,6 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Security.AccessControl;
@@ -488,9 +487,26 @@ public Tensor[] Run()
 
                 unsafe
                 {
-                    c_api.TF_SessionRun(_session, null, _inputs, _inputValues,
-                         _inputs.Length, _outputs, _outputValues, _outputValues.Length, _operations,
-                        _operations.Length, IntPtr.Zero, _status);
+                    try
+                    {
+                        c_api.TF_SessionRun(_session, null, _inputs, _inputValues,
+                             _inputs.Length, _outputs, _outputValues, _outputValues.Length, _operations,
+                            _operations.Length, IntPtr.Zero, _status);
+                    }
+                    catch (Exception ex)
+                    {
+                        try
+                        {
+                            _status.Check(throwException: true);
+                        }
+                        catch (Exception statusException)
+                        {
+                            throw new AggregateException(statusException, ex);
+                        }
+
+                        // _status didn't provide more information, so just rethrow the original exception
+                        throw;
+                    }
                 }
 
                 _status.Check(true);