NullableTypeInfo.cs

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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
 
namespace System.Diagnostics.Tracing;
 
internal sealed class NullableTypeInfo : TraceLoggingTypeInfo
{
    private readonly TraceLoggingTypeInfo valueInfo;
 
    [RequiresUnreferencedCode("EventSource WriteEvent will serialize the whole object graph. Trimmer will not safely handle this case because properties may be trimmed. This can be suppressed if the object is a primitive type")]
    public NullableTypeInfo(Type type, List<Type> recursionCheck)
        : base(type)
    {
        Type[] genericTypeArguments = type.GenericTypeArguments;
        valueInfo = TraceLoggingTypeInfo.GetInstance(genericTypeArguments[0], recursionCheck);
    }
 
    public override void WriteMetadata(TraceLoggingMetadataCollector collector, string name, EventFieldFormat format)
    {
        TraceLoggingMetadataCollector traceLoggingMetadataCollector = collector.AddGroup(name);
        traceLoggingMetadataCollector.AddScalar("HasValue", TraceLoggingDataType.Boolean8);
        valueInfo.WriteMetadata(traceLoggingMetadataCollector, "Value", format);
    }
 
    [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2072:UnrecognizedReflectionPattern", Justification = "The underlying type of Nullable<T> must be defaultable")]
    public override void WriteData(PropertyValue value)
    {
        object referenceValue = value.ReferenceValue;
        bool flag = referenceValue != null;
        TraceLoggingDataCollector.AddScalar(flag);
        PropertyValue value2 = valueInfo.PropertyValueFactory(flag ? referenceValue : RuntimeHelpers.GetUninitializedObject(valueInfo.DataType));
        valueInfo.WriteData(value2);
    }
}