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[release/6.0] Remove redundant allocations from JsonSerializerOptions.GetConverter calls #65898

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Merged
ericstj merged 2 commits into from
Mar 10, 2022
Merged

[release/6.0] Remove redundant allocations from JsonSerializerOptions.GetConverter calls #65898

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b5c85f7
Fix default converter reallocation on each call to JsonSerializerOpti…
eiriktsarpalis Feb 25, 2022
c399afa
ensure package is released
eiriktsarpalis Mar 9, 2022
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35 changes: 19 additions & 16 deletions ...s/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Converters.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,23 +30,26 @@ public sealed partial class JsonSerializerOptions
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
private void RootBuiltInConverters()
{
s_defaultSimpleConverters = GetDefaultSimpleConverters();
s_defaultFactoryConverters = new JsonConverter[]
if (s_defaultSimpleConverters is null)
{
// Check for disallowed types.
new UnsupportedTypeConverterFactory(),
// Nullable converter should always be next since it forwards to any nullable type.
new NullableConverterFactory(),
new EnumConverterFactory(),
new JsonNodeConverterFactory(),
new FSharpTypeConverterFactory(),
// IAsyncEnumerable takes precedence over IEnumerable.
new IAsyncEnumerableConverterFactory(),
// IEnumerable should always be second to last since they can convert any IEnumerable.
new IEnumerableConverterFactory(),
// Object should always be last since it converts any type.
new ObjectConverterFactory()
};
s_defaultSimpleConverters = GetDefaultSimpleConverters();
s_defaultFactoryConverters = new JsonConverter[]
{
// Check for disallowed types.
new UnsupportedTypeConverterFactory(),
// Nullable converter should always be next since it forwards to any nullable type.
new NullableConverterFactory(),
new EnumConverterFactory(),
new JsonNodeConverterFactory(),
new FSharpTypeConverterFactory(),
// IAsyncEnumerable takes precedence over IEnumerable.
new IAsyncEnumerableConverterFactory(),
// IEnumerable should always be second to last since they can convert any IEnumerable.
new IEnumerableConverterFactory(),
// Object should always be last since it converts any type.
new ObjectConverterFactory()
};
}
}

private static Dictionary<Type, JsonConverter> GetDefaultSimpleConverters()
Expand Down