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Provides guidance on new System.Text.Json APIs introduced in .NET 11. It covers typed JsonTypeInfo access via GetTypeInfo<T> and TryGetTypeInfo<T> on JsonSerializerOptions, and the new JsonNamingPolicy.PascalCase static property. Use when serializing or deserializing JSON in .NET 11 applications and needing typed metadata access or PascalCase property naming.
npx skill4agent add dotnet/skills system-text-json-net11System.Text.JsonJsonTypeInfo<T>JsonTypeInfoTryGetTypeInfo<T>System.Text.JsonGetTypeInfo(Type)TryGetTypeInfo(Type, ...)<TargetFramework>net11.0</TargetFramework>JsonTypeInfoJsonSerializerOptions.GetTypeInfo<T>()JsonTypeInfo<T>JsonTypeInfo<T> GetTypeInfo<T>()JsonSerializerOptions.TryGetTypeInfo<T>(out JsonTypeInfo<T>?)bool TryGetTypeInfo<T>(out JsonTypeInfo<T>? typeInfo)JsonNamingPolicy.PascalCasestatic JsonNamingPolicy PascalCase { get; }using System.Text.Json;
using System.Text.Json.Serialization.Metadata;
var options = new JsonSerializerOptions(JsonSerializerDefaults.Web);
// Retrieve strongly-typed metadata for MyClass
JsonTypeInfo<MyClass> typeInfo = options.GetTypeInfo<MyClass>();
Console.WriteLine($"Type: {typeInfo.Type.Name}");using System.Text.Json;
using System.Text.Json.Serialization.Metadata;
var options = new JsonSerializerOptions(JsonSerializerDefaults.Web);
if (options.TryGetTypeInfo<MyClass>(out var info))
{
Console.WriteLine($"Resolved type info for {info!.Type.Name}");
}
else
{
Console.WriteLine("Type info not available");
}using System.Text.Json;
var opts = new JsonSerializerOptions
{
PropertyNamingPolicy = JsonNamingPolicy.PascalCase
};
var obj = new { firstName = "John", lastName = "Doe" };
string json = JsonSerializer.Serialize(obj, opts);
Console.WriteLine(json);
// Output: {"FirstName":"John","LastName":"Doe"}using System.Text.Json;
using System.Text.Json.Serialization.Metadata;
var options = new JsonSerializerOptions
{
PropertyNamingPolicy = JsonNamingPolicy.PascalCase
};
JsonTypeInfo<Person> typeInfo = options.GetTypeInfo<Person>();
string json = JsonSerializer.Serialize(new Person("Jane", 30), typeInfo);
Console.WriteLine(json);
// Output: {"Name":"Jane","Age":30}
public record Person(string Name, int Age);