ConstantField bug.cs

ConstantField bug.cs

using System;
using System.Linq.Expressions;
using System.Reflection;

namespace MyConsoleHelper
{
    class PropertyAndFields
    {
        public string StringProperty { get; set; }
        public string StringField;
        public readonly string ReadonlyStringField;
        public string ReadonlyStringProperty => "";
        public static string StaticStringProperty { get; set; }
        public static string StaticStringField;
        public static string StaticReadonlyStringProperty => "";
        public static readonly string StaticReadonlyStringField = "";
        public const string ConstantString = "Constant";
    }

    class Program
    {
        static void Main(string[] args)
        {
            MemberInfo member = typeof(PropertyAndFields).GetMember(nameof(PropertyAndFields.ConstantString))[0];
            Expression<Func<PropertyAndFields>> attemptAssignToConstant = Expression.Lambda<Func<PropertyAndFields>>(
                Expression.MemberInit(
                    Expression.New(typeof(PropertyAndFields)),
                    Expression.Bind(member, Expression.Constant(""))
                    )
                );

            attemptAssignToConstant.Compile(true);

            //netcore:  System.NotSupportedException: Specified method is not supported.
            //mono: System.MissingFieldException: Field 'MyConsoleHelper.PropertyAndFields.ConstantString' not found.
        }
    }
}