-Fixed JsonTextReader sync read in async method

Src/Newtonsoft.Json.Tests/Issues/Issue1569.cs

@@ -0,0 +1,125 @@
+#region License
+// Copyright (c) 2007 James Newton-King
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+#endregion
+
+#if !(NET20 || NET35 || NET40 || PORTABLE || PORTABLE40) || NETSTANDARD1_3 || NETSTANDARD2_0
+using System;
+using System.IO;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+#if DNXCORE50
+using System.Reflection;
+using Xunit;
+using Test = Xunit.FactAttribute;
+using Assert = Newtonsoft.Json.Tests.XUnitAssert;
+#else
+using NUnit.Framework;
+#endif
+
+namespace Newtonsoft.Json.Tests.Issues
+{
+    [TestFixture]
+    public class Issue1569 : TestFixtureBase
+    {
+        [Test]
+        public async Task Test()
+        {
+            string json = "[1,2,3,456789999999999999999999999999999999999999999999999999999999999999456789999999999999999999999999999999999999999999999999999999999999456789999999999999999999999999999999999999999999999999999999999999]";
+
+            Stream s = new AsyncOnlyStream(new MemoryStream(Encoding.UTF8.GetBytes(json)));
+            StreamReader sr = new StreamReader(s, Encoding.UTF8, true, 2);
+            JsonTextReader reader = new JsonTextReader(sr);
+#if DEBUG
+            reader.CharBuffer = new char[2];
+#endif
+
+            while (await reader.ReadAsync())
+            {   
+            }
+        }
+
+        public class AsyncOnlyStream : Stream
+        {
+            private readonly Stream _innerStream;
+
+            public AsyncOnlyStream(Stream innerStream)
+            {
+                _innerStream = innerStream;
+            }
+
+            public override void Flush()
+            {
+                throw new NotSupportedException();
+            }
+
+            public override Task FlushAsync(CancellationToken cancellationToken)
+            {
+                return _innerStream.FlushAsync(cancellationToken);
+            }
+
+            public override long Seek(long offset, SeekOrigin origin)
+            {
+                return _innerStream.Seek(offset, origin);
+            }
+
+            public override void SetLength(long value)
+            {
+                _innerStream.SetLength(value);
+            }
+
+            public override int Read(byte[] buffer, int offset, int count)
+            {
+                throw new NotSupportedException();
+            }
+
+            public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+            {
+                return _innerStream.ReadAsync(buffer, offset, count, cancellationToken);
+            }
+
+            public override void Write(byte[] buffer, int offset, int count)
+            {
+                throw new NotSupportedException();
+            }
+
+            public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+            {
+                return _innerStream.WriteAsync(buffer, offset, count, cancellationToken);
+            }
+
+            public override bool CanRead => _innerStream.CanRead;
+            public override bool CanSeek => _innerStream.CanSeek;
+            public override bool CanWrite => _innerStream.CanWrite;
+            public override long Length => _innerStream.Length;
+
+            public override long Position
+            {
+                get => _innerStream.Position;
+                set => _innerStream.Position = value;
+            }
+        }
+    }
+}
+#endif

Src/Newtonsoft.Json/JsonTextReader.Async.cs

@@ -362,7 +362,7 @@ namespace Newtonsoft.Json
 
                         if (char.IsNumber(currentChar) || currentChar == '-' || currentChar == '.')
                         {
-                            ParseNumber(ReadType.Read);
+                            await ParseNumberAsync(ReadType.Read, cancellationToken).ConfigureAwait(false);
                             return true;
                         }