System.Text.Json, JsonSerializerOptions, PropertyNameCaseInsensitive

[shawnallen85]

What is the appropriate method for setting PropertyNameCaseInsensitive?

I tried setting it with the following, but no luck:

                services.AddMassTransit(x =>
                {
                    x.AddOptions<JsonSerializerOptions>()
                        .Configure(options =>
                        {
                            options.PropertyNameCaseInsensitive = false; // also tried true
                        });
                    // Rest is removed
                });

This is for a project where I don't have control over how the JSON is formatted.

Error details:

System.Runtime.Serialization.SerializationException: Failed to serialize message
 ---> System.InvalidOperationException: The JSON property name for 'Binance.Common.Ticker.EventTime' collides with another property.
   at System.Text.Json.ThrowHelper.ThrowInvalidOperationException_SerializerPropertyNameConflict(Type type, JsonPropertyInfo jsonPropertyInfo)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember(JsonPropertyInfo jsonPropertyInfo, JsonPropertyDictionary`1 propertyCache, Dictionary`2& ignoredMembers)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember(Type declaringType, Type memberType, MemberInfo memberInfo, Boolean isVirtual, Nullable`1 typeNumberHandling, Boolean& propertyOrderSpecified, Dictionary`2& ignoredMembers)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonConverter converter, Type runtimeType, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializerOptions.<InitializeForReflectionSerializer>g__CreateJsonTypeInfo|112_0(Type type, JsonSerializerOptions options)
   at System.Text.Json.JsonSerializerOptions.GetClassFromContextOrCreate(Type type)
   at System.Text.Json.JsonSerializerOptions.GetOrAddClass(Type type)
   at System.Text.Json.WriteStackFrame.InitializeReEntry(Type type, JsonSerializerOptions options)
   at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.GetMemberAndWriteJson(Object obj, WriteStack& state, Utf8JsonWriter writer)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryWrite(Utf8JsonWriter writer, T value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1.WriteCore(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.JsonSerializer.WriteUsingSerializer[TValue](Utf8JsonWriter writer, TValue& value, JsonTypeInfo jsonTypeInfo)
   at System.Text.Json.JsonSerializer.Serialize[TValue](Utf8JsonWriter writer, TValue value, JsonSerializerOptions options)
   at MassTransit.Serialization.JsonConverters.TypeMappingJsonConverter`2.Write(Utf8JsonWriter writer, TType value, JsonSerializerOptions options) in /_/src/MassTransit/Serialization/JsonConverters/TypeMappingJsonConverter.cs:line 20
   at System.Text.Json.Serialization.JsonConverter`1.TryWrite(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.Serialization.JsonConverter`1.WriteCore(Utf8JsonWriter writer, T& value, JsonSerializerOptions options, WriteStack& state)
   at System.Text.Json.JsonSerializer.WriteUsingSerializer[TValue](Utf8JsonWriter writer, TValue& value, JsonTypeInfo jsonTypeInfo)
   at System.Text.Json.JsonSerializer.WriteBytesUsingSerializer[TValue](TValue& value, JsonTypeInfo jsonTypeInfo)
   at System.Text.Json.JsonSerializer.SerializeToUtf8Bytes[TValue](TValue value, JsonSerializerOptions options)
   at MassTransit.Serialization.SystemTextJsonMessageBody`1.GetBytes() in /_/src/MassTransit/Serialization/SystemTextJsonMessageBody.cs:line 50
   --- End of inner exception stack trace ---
   at MassTransit.Serialization.SystemTextJsonMessageBody`1.GetBytes() in /_/src/MassTransit/Serialization/SystemTextJsonMessageBody.cs:line 56
   at MassTransit.InMemoryTransport.InMemorySendTransport.Send[T](T message, IPipe`1 pipe, CancellationToken cancellationToken) in /_/src/MassTransit/InMemoryTransport/InMemoryTransport/InMemorySendTransport.cs:line 44

Class in question:

public class Ticker
{
    [JsonPropertyName("e")]
    public string EventType { get; set; } = "trade";
    
    [JsonPropertyName("E")]
    public Instant EventTime { get; set; }

    [JsonPropertyName("s")]
    public string Symbol { get; set; } = "";

    [JsonPropertyName("t")]
    public long TradeId { get; set; }

    [JsonPropertyName("p")]
    public decimal Price { get; set; }

    [JsonPropertyName("q")]
    public decimal Quantity { get; set; }

    [JsonPropertyName("b")]
    public long BuyerOrderId { get; set; }

    [JsonPropertyName("a")]
    public long SellerOrderId { get; set; }

    [JsonPropertyName("T")]
    public Instant TradeTime { get; set; }

    [JsonPropertyName("m")]
    public bool BuyerMarketMakerIndicator { get; set; }
}

JSON example:

{
  "e": "trade",     // Event type
  "E": 123456789,   // Event time
  "s": "BNBBTC",    // Symbol
  "t": 12345,       // Trade ID
  "p": "0.001",     // Price
  "q": "100",       // Quantity
  "b": 88,          // Buyer order ID
  "a": 50,          // Seller order ID
  "T": 123456785,   // Trade time
  "m": true,        // Is the buyer the market maker?
  "M": true         // Ignore
}

Thanks,
Shawn

[phatboyg]

To configure the JSON serializer options used by MassTransit, use the code below. MassTransit has its own options, which aren't affected by whatever that configuration above does.

cfg.ConfigureJsonSerializerOptions(options => 
{
    options.PropertyNameCaseInsensitive = false;

    return options;
});

Oh, and this is within the UsingRabbitMq((context, cfg) => or whatever transport you're using.

[shawnallen85]

Awesome, thank you, sir!