The JsonIgnoreCondition annotation is lost when moving from 13.2 to 14.1

[maxarm]

Hi,

when using the nswag C# Client generation of v13.2 the model properties had been annotated with [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingDefault)] . And with that the client did not serialize null values, which we appreciated.

After upgrading to v14.1 these annotations were lost in the generated client.cs.

I tried to add the DefaultIgnoreCondition in the OpenApiDocumentGenerator, but that did not change the generated cs-file. Worth mentioning is that the change to PropertyNamingPolicy within the OpenApiDocumentGenerator helped however and added the annotation [System.Text.Json.Serialization.JsonPropertyName("fieldName")] to the generated Client.cs.

internal class OpenApiDocumentGeneratorWrapper(IServiceProvider serviceProvider) : IOpenApiDocumentGenerator {
  public async Task<OpenApiDocument> GenerateAsync(string documentName) {
    var generator = new AspNetCoreOpenApiDocumentGenerator(new AspNetCoreOpenApiDocumentGeneratorSettings {
      SchemaSettings = new SystemTextJsonSchemaGeneratorSettings {
        SchemaType = SchemaType.OpenApi3,
        SerializerOptions = new JsonSerializerOptions {
          PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
          DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
        }
      }
    });
    return await generator.GenerateAsync(serviceProvider);
  }

I also had a look into nswag.json, if a property recommends itself allowing to change the null-serialization behavior. But I found none.

Does anybody have the same issue or even a solution to omit serialization of fields having a null value?

Thanks
Max