juipnet/Infrastructure/Hncore.Infrastructure/Serializer/JsonNetSetting.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Hncore.Infrastructure.Common;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;

namespace Hncore.Infrastructure.Serializer
{
    public class NullToEmptyStringResolver : DefaultContractResolver
    {
        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
        {
            return type.GetProperties()
                .Select(p =>
                {
                    var jp = base.CreateProperty(p, memberSerialization);
                    jp.ValueProvider = new NullToEmptyStringValueProvider(p);
                    return jp;
                }).ToList();
        }
    }

    public class NullToEmptyStringValueProvider : IValueProvider
    {
        PropertyInfo _MemberInfo;

        public NullToEmptyStringValueProvider(PropertyInfo memberInfo)
        {
            _MemberInfo = memberInfo;
        }

        public object GetValue(object target)
        {
            object result = _MemberInfo.GetValue(target);
            if (_MemberInfo.PropertyType == typeof(string) && result == null)
            {
                result = "";
            }
            else if ((_MemberInfo.PropertyType == typeof(DateTime) || _MemberInfo.PropertyType == typeof(DateTime?)) &&
                     result != null)
            {
                if (result.ToString() == "0001/1/1 0:00:00" || result.ToString() == "1000/1/1 0:00:00")
                {
                    result = DateTimeHelper.SqlMinTime;
                }

                DateTime time = Convert.ToDateTime(result);

                if (time == DateTimeHelper.SqlMaxTime || time == DateTimeHelper.SqlMinTime || time == DateTime.MaxValue ||
                    time == DateTime.MinValue)
                {
                    result = "";
                }
            }
            else if (_MemberInfo.PropertyType.Name == "List`1" && result == null)
            {
                result = new List<object>();
            }
            else if (_MemberInfo.PropertyType.Name == "Object" && result == null)
            {
                result = new { };
            }

            return result;
        }

        public void SetValue(object target, object value)
        {
            _MemberInfo.SetValue(target, value);
        }
    }
}