json.net 比jsonIgnore 更好的方法修改源码

浏览数：26 / 时间：2015年06月09日

关于 JsonIgnore 问题，

EF T4 模板中存在主外键关系

namespace WindowsFormsApplication1
{
    using System;
    using System.Collections.Generic;
    using Newtonsoft.Json;
    public partial class MaterielProcedures
    {
        public int Kid { get; set; }
        public Nullable<int> OKid { get; set; }
        public int Node { get; set; }
        public string ProcedureType { get; set; }
        public string ProcedureNeed { get; set; }
        public string Author { get; set; }
        public System.DateTime CreateTime { get; set; }
        public Nullable<System.DateTime> StartTime { get; set; }
        public Nullable<double> PlanHour { get; set; }
        public Nullable<System.DateTime> EndTime { get; set; }
        public Nullable<int> PercentAge { get; set; }
        public string ProcedureState { get; set; }
        public bool IsOut { get; set; }
        [JsonIgnore]
        public virtual bom_2d bom_2d { get; set; }
    }
}

bom_2d 是 MaterielProcedures 的外键，用到 json.net 来把 MaterielProcedures 类变成 json 字符串的时候，会因为这个外键报错。

解决方法是在 public virtual bom_2d bom_2d { get; set; }上面一行加上 [JsonIgnore]。

但是每次重新生成模板，都会重新生成 MaterielProcedures 类。

所以直接找到出问题的源码，进行修改，跟踪了 N 多方法终于

 private void SerializeObject(JsonWriter writer, object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty)
        {
            OnSerializing(writer, contract, value);

            _serializeStack.Add(value);

            WriteObjectStart(writer, value, contract, member, collectionContract, containerProperty);

            int initialDepth = writer.Top;

            for (int index = 0; index < contract.Properties.Count; index++)
            {
                JsonProperty property = contract.Properties[index];
                try
                {
                    object memberValue;
                    JsonContract memberContract;

                    if (!CalculatePropertyValues(writer, value, contract, member, property, out memberContract, out memberValue))
                        continue;
                    #region add by 253
                    if (!memberContract.CreatedType.BaseType.FullName.Contains("System."))
                        continue; 
                    #endregion
                    property.WritePropertyName(writer);
                    SerializeValue(writer, memberValue, memberContract, property, contract, member);
                }
                catch (Exception ex)
                {
                    if (IsErrorHandled(value, contract, property.PropertyName, null, writer.ContainerPath, ex))
                        HandleError(writer, initialDepth);
                    else
                        throw;
                }
            }

            if (contract.ExtensionDataGetter != null)
            {
                IEnumerable<KeyValuePair<object, object>> extensionData = contract.ExtensionDataGetter(value);
                if (extensionData != null)
                {
                    foreach (KeyValuePair<object, object> e in extensionData)
                    {
                        JsonContract keyContract = GetContractSafe(e.Key);
                        JsonContract valueContract = GetContractSafe(e.Value);

                        bool escape;
                        string propertyName = GetPropertyName(writer, e.Key, keyContract, out escape);

                        if (ShouldWriteReference(e.Value, null, valueContract, contract, member))
                        {
                            writer.WritePropertyName(propertyName);
                            WriteReference(writer, e.Value);
                        }
                        else
                        {
                            if (!CheckForCircularReference(writer, e.Value, null, valueContract, contract, member))
                                continue;

                            writer.WritePropertyName(propertyName);

                            SerializeValue(writer, e.Value, valueContract, null, contract, member);
                        }
                    }
                }
            }

            writer.WriteEndObject();

            _serializeStack.RemoveAt(_serializeStack.Count - 1);

            OnSerialized(writer, contract, value);
        }