c# – 存储复合/嵌套对象图

发布时间：2020-12-15 17:19:20 所属栏目：百科来源：网络整理

导读：我目前正在Mongo DB中开发一个文档存储库,其中包含特定项目的完整材料明细.计算细分并包含复合结构. 域名模型： public interface IReagent{ int ItemId { get; set; } int Quantity { get; set; } ConcurrentBagIReagent Reagents { get; set; }}public cla

我目前正在Mongo DB中开发一个文档存储库,其中包含特定项目的完整材料明细.计算细分并包含复合结构.

域名模型：

public interface IReagent
{
    int ItemId { get; set; }
    int Quantity { get; set; }
    ConcurrentBag<IReagent> Reagents { get; set; }
}

public class Craft : IReagent
{
    public int ItemId { get; set; }
    public int Quantity { get; set; }
    public int SpellId { get; set; }
    public int Skill { get; set; }
    public Profession Profession { get; set; }
    public ConcurrentBag<IReagent> Reagents { get; set; }
}

public class Reagent : IReagent
{
    public int ItemId { get; set; }
    public int Quantity { get; set; }
    public ConcurrentBag<IReagent> Reagents { get; set; }
}

现在的问题是复合结构没有正确存储. mongodb中的试剂保持为空.

/* 28 */
{
  "_id" : ObjectId("4e497efa97e8b617f0d229d4"),"ItemId" : 52186,"Quantity" : 0,"SpellId" : 0,"Skill" : 475,"Profession" : 8,"Reagents" : { }
}

它的外观示例

{
    "_id" : ObjectId("4e497efa97e8b617f0d229d4"),"Reagents" : [
        {
            "ItemId" : 521833,"Quantity" : 3,"Skill" : 400,"Profession" : 7,"Reagents" : [
                {
                    "ItemId" : 52186,"Reagents" : [
                        {
                            "ItemId" : 52183,"Quantity" : 2,"Reagents" : []
                        },{
                            "ItemId" : 521832,"Quantity" : 1,"Reagents" : []
                        }
                    ]
                },{
                    "ItemId" : 52386,"Quantity" : 2
                    "SpellId" : 0,"Reagents" : [
                        {
                            "ItemId" : 52383,{
                            "ItemId" : 523832,"Reagents" : []
                        }
                    ]
                }
            ]
        }
    ]
}

可能是什么问题呢？

解决方法

问题是你正在使用抽象列表,它不能将这些序列化为JSON,所以基本上你需要编写自己的自定义序列化.这是我写的自定义序列化的示例：

public class FieldsWrapper : IBsonSerializable
    {
        public List<DataFieldValue> DataFieldValues { get; set; }


        public object Deserialize(MongoDB.Bson.IO.BsonReader bsonReader,Type nominalType,IBsonSerializationOptions options)
        {
        if (nominalType != typeof(FieldsWrapper)) throw new ArgumentException("Cannot deserialize anything but self");
        var doc = BsonDocument.ReadFrom(bsonReader);
        var list = new List<DataFieldValue>();
        foreach (var name in doc.Names)
        {
            var val = doc[name];
            if (val.IsString)
                list.Add(new DataFieldValue {LocalIdentifier = name,Values = new List<string> {val.AsString}});
            else if (val.IsBsonArray)
            {
                DataFieldValue df = new DataFieldValue {LocalIdentifier = name};
                foreach (var elem in val.AsBsonArray)
                {
                    df.Values.Add(elem.AsString);
                }
                list.Add(df);
            }
        }
        return new FieldsWrapper {DataFieldValues = list};
        }


        public void Serialize(MongoDB.Bson.IO.BsonWriter bsonWriter,IBsonSerializationOptions options)
        {
            if (nominalType != typeof (FieldsWrapper))
                throw new ArgumentException("Cannot serialize anything but self");
            bsonWriter.WriteStartDocument();
            foreach (var dataFieldValue in DataFieldValues)
            {

                bsonWriter.WriteName(dataFieldValue.LocalIdentifier);
                if (dataFieldValue.Values.Count != 1)
                {
                    var list = new string[dataFieldValue.Values.Count];
                    for (int i = 0; i < dataFieldValue.Values.Count; i++)
                        list[i] = dataFieldValue.Values[i];
                    BsonSerializer.Serialize(bsonWriter,list); 
                }
                else
                {
                    BsonSerializer.Serialize(bsonWriter,dataFieldValue.Values[0]); 
                }
            }
            bsonWriter.WriteEndDocument();
        }

    }

在您的情况下,我会在Reagent类的级别上编写自定义序列化

（编辑：李大同）

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