如何在LiteDb中设置自定义类型？

using LiteDB;

// 创建自定义类型
public class MyCustomType : BsonValue
{
    private string _value;

    public MyCustomType(string value)
    {
        _value = value;
    }

    public override BsonType Type => BsonType.String;

    public override string ToString()
    {
        return _value;
    }
}

// 设置自定义类型映射
var mapper = new BsonMapper();
mapper.CustomTypeMapper = new Dictionary<Type, Func<object, BsonValue>>
{
    { typeof(MyCustomType), obj => new BsonValue(((MyCustomType)obj).ToString()) }
};

// 使用自定义类型
using (var db = new LiteDatabase("myDatabase.db", mapper))
{
    var collection = db.GetCollection("myCollection");

    var myObject = new
    {
        Id = 1,
        CustomValue = new MyCustomType("Custom Data")
    };

    collection.Insert(myObject);
}