internal static Action CreateSetter()

in src/OpenTelemetryEngine/Traces/ActivityExtensions.cs [71:91]

• 17 lines of code
• 4 McCabe index (conditional complexity)

        internal static Action<TTarget, TValue> CreateSetter<TTarget, TValue>(this FieldInfo fieldInfo)
        {
            if (fieldInfo == null)
            {
                throw new ArgumentNullException(nameof(fieldInfo));
            }

            ParameterExpression targetExp = Expression.Parameter(typeof(TTarget), "target");
            Expression source = targetExp;

            if (typeof(TTarget) != fieldInfo.DeclaringType && fieldInfo.DeclaringType is not null)
            {
                source = Expression.Convert(targetExp, fieldInfo.DeclaringType);
            }

            // Creating the setter to set the value to the field
            ParameterExpression valueExp = Expression.Parameter(typeof(TValue), "value");
            MemberExpression fieldExp = Expression.Field(source, fieldInfo);
            BinaryExpression assignExp = Expression.Assign(fieldExp, valueExp);
            return Expression.Lambda<Action<TTarget, TValue>>(assignExp, targetExp, valueExp).Compile();
        }