System.Text.Json

System.Text.Json – How to customize serialization with JsonConverter

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Most of the time JsonSerializer will get you want you want. You can pass in options to control serialization to a certain extent. But sometimes you’ll run into scenarios where you need to customize how it handles serialization for a specific type. This is where JsonConverter comes in. To customize serialization for a specific type, … Read more System.Text.Json – How to customize serialization with JsonConverter

System.Text.Json.JsonException: A possible object cycle was detected which is not supported

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When you use System.Text.Json.JsonSerializer to serialize an object that has a cycle, you’ll 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. This is the same problem … Read more System.Text.Json.JsonException: A possible object cycle was detected which is not supported

C# – Using SqlDataReader to process multiple result sets

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In this article I’ll show how to use the SqlDataReader ADO.NET class in two scenarios involving multiple result sets: Batches – When you execute multiple SELECTs in a single query. Each SELECT returns a different result set. You use a single reader to process the batch. Nested Queries – When you use multiple SqlDataReaders on … Read more C# – Using SqlDataReader to process multiple result sets

C# – Working with tuples

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Here’s how you create a tuple: Tuples are containers for two or more variables. Without tuples, you’d have to use a class/struct, like this: In other words, tuples provide a convenient alternative to class/structs. Instead of having tons of data container classes, you can use tuples. In this article, I’ll show examples of how to … Read more C# – Working with tuples

System.InvalidOperationException: Serializer options cannot be changed once serialization or deserialization has occurred

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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 System.InvalidOperationException: Serializer options cannot be changed once serialization or deserialization has occurred

.NET JsonSerializer is over 200x faster if you reuse JsonSerializerOptions

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When you serialize an object using the built-in .NET JsonSerializer (System.Text.Json), reusing the JsonSerializerOptions object is 200x faster than serializing with a new options object each time. The JsonSerializerOptions object must have some kind of internal caching mechanism that makes subsequent serializations on the same type significantly faster. Note: Creating the new JsonSerializerOptions object adds … Read more .NET JsonSerializer is over 200x faster if you reuse JsonSerializerOptions

C# – How to copy an object

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In this article I’ll explain how to copy an object. First I’ll explain the difference between shallow and deep copying. Then I’ll show how to shallow copy and four different ways to deep copy – including manually copying and using serialization. Finally I’ll show a speed and feature comparison of each approach, and a decision … Read more C# – How to copy an object

C# – How to use enum flags to pass multiple options as a single parameter

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When you need to pass multiple options into a method, normally you would add a bool flag for each parameter, like: Not only is using bool flags a bit of a code smell, but when this list of parameters gets too big, you’ll probably want to refactor by moving the bool flags into an options … Read more C# – How to use enum flags to pass multiple options as a single parameter

JsonException: The JSON value could not be converted to Enum

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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 JsonException: The JSON value could not be converted to Enum

C# – Case sensitivity in JSON deserialization

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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 C# – Case sensitivity in JSON deserialization