jsonserializeroptions

JsonException: A possible object cycle was detected

by

When you use System.Text.Json.JsonSerializer to serialize an object that has a cycle, you get the following exception: System.Text.Json.JsonException: A possible object cycle was detected which is not supported. This can either be due to a cycle or if the object depth is larger than the maximum allowed depth of 0. In .NET 6+, you can … Read more

C# – Using SqlDataReader to process multiple result sets

by

In this article I’ll show how to use the SqlDataReader ADO.NET class in two scenarios involving multiple result sets: I have a StreamingService database that has Movies, Shows, and Episodes tables (linked to the shows). First I’ll show the model classes I’m mapping the data into. Then I’ll show the two scenarios where I’m using … Read more

C# – Serialize a tuple to JSON

by

When you serialize a tuple to JSON, it uses the the underlying ValueTuple’s field names – Item1 and Item2. It doesn’t matter if you’re using a named tuple, it won’t use the names you specified in the tuple declaration. This behavior is the same with Newtonsoft and System.Text.Json. Here’s an example of serializing a named … Read more

Serializer options cannot be changed once serialization or deserialization has occurred

by

Problem When using System.Text.Json, it’s a good idea to reuse JsonSerializerOptions objects. This leads to a massive 200x speedup in subsequent calls to the serializer. The downside is you can’t change properties on the options object after you’ve passed it in a Serialize()/Deserialize() call. You’ll get the exception: System.InvalidOperationException: Serializer options cannot be changed once … Read more

C# – Reuse JsonSerializerOptions for performance

by

Reusing JsonSerializerOptions (from System.Text.Json) is optimal for performance. It caches type info, which results in a 200x speedup when it deals with the type again. Therefore, always try to reuse JsonSerializerOptions. I’ll show a speed comparison of serializing with and without reusing JsonSerializerOptions. Measuring the performance gains of reusing JsonSerializerOptions To measure the performance gains … Read more

C# – How to copy an object

by

In this article I’ll explain how to copy an object. I’ll explain the difference between shallow and deep copying, and then show multiple ways to do both approaches for copying objects. At the end, I’ll show a performance and feature comparison to help you decide which object copying method to use. Shallow copy vs Deep … Read more

JsonException: The JSON value could not be converted to Enum

by

When you’re using System.Text.Json to deserialize JSON that contains the string representation of an enum, you get the following exception: System.Text.Json.JsonException: The JSON value could not be converted to <Enum Type> The following JSON would cause this exception. Conference is an enum, and this is using the string representation “NFC” instead of the numeric value … Read more

C# – Case sensitivity in JSON deserialization

by

By default Newtonsoft does case insensitive JSON deserialization and System.Text.Json does case sensitive JSON deserialization. Case sensitivity comes into play when a JSON string is being deserialized into an object. If you’re using case sensitive deserialization, then keys in the JSON string must match type names exactly, otherwise it won’t deserialize the class/property with the … Read more