LitedbEnumDemo.cs

// The type to be persisted
using System;
using Newtonsoft.Json;

namespace Demo
{
    public class SomeConfiguration
    {
        /// <summary>
        /// Gets or sets the identifier for this record.
        /// </summary>
        [JsonIgnore]
        public Guid Id { get; set; }

        /// <summary>
        /// Gets or sets the environment.
        /// </summary>
        public Environment Environment { get; set; }

        /// <summary>
        /// Gets or sets the 
        /// </summary>
        public string Accept { get; set; }
        
        /// <summary>
        /// Gets or sets the 
        /// </summary>
        public string AcceptEncoding { get; set; }
  }
}

// the Enum
using System.ComponentModel;

namespace Demo
{
    /// <summary>
    /// The environment context for the configuration data
    /// </summary>
    public enum Environment
    {
        /// <summary> The development environment </summary>
        [Description("Development")]
        Development,

        /// <summary> The test environment </summary>
        [Description("Test")]
        Test,

        /// <summary> The regression environment </summary>
        [Description("Regression")]
        Regression,

        /// <summary> The production environment </summary>
        [Description("Production")]
        Production
    }
}

// Save to LiteDB as ususal

// This works
SomeConfiguration configuration = someConfigurationCollection.Find(
      Query.EQ(nameof(SomeConfiguration.Environment), Environment.Development.ToString())).FirstOrDefault();
      
// This doesn't
SomeConfiguration configuration = someConfigurationCollection.Find(
      item => item.Environment == Environment.Development).FirstOrDefault();