浅析ASP.NET万能JSON解析器

using System;
using System.Collections.Generic;
using System.Text;
namespace Pixysoft.Json
{
    public class CommonJsonModelAnalyzer
    {
        protected string _GetKey(string rawjson)
        {
            if (string.IsNullOrEmpty(rawjson))
                return rawjson;
            rawjson = rawjson.Trim();
            string[] jsons = rawjson.Split(new char[] { ':' });
            if (jsons.Length < 2)
                return rawjson;
            return jsons[0].Replace("\"", "").Trim();
        }
        protected string _GetValue(string rawjson)
        {
            if (string.IsNullOrEmpty(rawjson))
                return rawjson;
            rawjson = rawjson.Trim();
            string[] jsons = rawjson.Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries);
            if (jsons.Length < 2)
                return rawjson;
            StringBuilder builder = new StringBuilder();
            for (int i = 1; i < jsons.Length; i++)
            {
                builder.Append(jsons[i]);
                builder.Append(":");
            }
            if (builder.Length > 0)
                builder.Remove(builder.Length - 1, 1);
            string value = builder.ToString();
            if (value.StartsWith("\""))
                value = value.Substring(1);
            if (value.EndsWith("\""))
                value = value.Substring(0, value.Length - 1);
            return value;
        }
        protected List<string> _GetCollection(string rawjson)
        {
            //[{},{}]
            List<string> list = new List<string>();
            if (string.IsNullOrEmpty(rawjson))
                return list;
            rawjson = rawjson.Trim();
            StringBuilder builder = new StringBuilder();
            int nestlevel = -1;
            int mnestlevel = -1;
            for (int i = 0; i < rawjson.Length; i++)
            {
                if (i == 0)
                    continue;
                else if (i == rawjson.Length - 1)
                    continue;
                char jsonchar = rawjson[i];
                if (jsonchar == '{')
                {
                    nestlevel++;
                }
                if (jsonchar == '}')
                {
                    nestlevel--;
                }
                if (jsonchar == '[')
                {
                    mnestlevel++;
                }
                if (jsonchar == ']')
                {
                    mnestlevel--;
                }
                if (jsonchar == ',' && nestlevel == -1 && mnestlevel == -1)
                {
                    list.Add(builder.ToString());
                    builder = new StringBuilder();
                }
                else
                {
                    builder.Append(jsonchar);
                }
            }
            if (builder.Length > 0)
                list.Add(builder.ToString());
            return list;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
namespace Pixysoft.Json
{
    public class CommonJsonModel : CommonJsonModelAnalyzer
    {
        private string rawjson;
        private bool isValue = false;
        private bool isModel = false;
        private bool isCollection = false;
        internal CommonJsonModel(string rawjson)
        {
            this.rawjson = rawjson;
            if (string.IsNullOrEmpty(rawjson))
                throw new Exception("missing rawjson");
            rawjson = rawjson.Trim();
            if (rawjson.StartsWith("{"))
            {
                isModel = true;
            }
            else if (rawjson.StartsWith("["))
            {
                isCollection = true;
            }
            else
            {
                isValue = true;
            }
        }
        public string Rawjson
        {
            get { return rawjson; }
        }
        public bool IsValue()
        {
            return isValue;
        }
        public bool IsValue(string key)
        {
            if (!isModel)
                return false;
            if (string.IsNullOrEmpty(key))
                return false;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    return submodel.IsValue();
                }
            }
            return false;
        }
        public bool IsModel()
        {
            return isModel;
        }
        public bool IsModel(string key)
        {
            if (!isModel)
                return false;
            if (string.IsNullOrEmpty(key))
                return false;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    return submodel.IsModel();
                }
            }
            return false;
        }
        public bool IsCollection()
        {
            return isCollection;
        }
        public bool IsCollection(string key)
        {
            if (!isModel)
                return false;
            if (string.IsNullOrEmpty(key))
                return false;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    return submodel.IsCollection();
                }
            }
            return false;
        }

        /// <summary>
        /// 当模型是对象，返回拥有的key
        /// </summary>
        /// <returns></returns>
        public List<string> GetKeys()
        {
            if (!isModel)
                return null;
            List<string> list = new List<string>();
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                string key = new CommonJsonModel(subjson).Key;
                if (!string.IsNullOrEmpty(key))
                    list.Add(key);
            }
            return list;
        }
        /// <summary>
        /// 当模型是对象，key对应是值，则返回key对应的值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public string GetValue(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                    return model.Value;
            }
            return null;
        }
        /// <summary>
        /// 模型是对象，key对应是对象，返回key对应的对象
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public CommonJsonModel GetModel(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    if (!submodel.IsModel())
                        return null;
                    else
                        return submodel;
                }
            }
            return null;
        }
        /// <summary>
        /// 模型是对象，key对应是集合，返回集合
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public CommonJsonModel GetCollection(string key)
        {
            if (!isModel)
                return null;
            if (string.IsNullOrEmpty(key))
                return null;
            foreach (string subjson in base._GetCollection(this.rawjson))
            {
                CommonJsonModel model = new CommonJsonModel(subjson);
                if (!model.IsValue())
                    continue;
                if (model.Key == key)
                {
                    CommonJsonModel submodel = new CommonJsonModel(model.Value);
                    if (!submodel.IsCollection())
                        return null;
                    else
                        return submodel;
                }
            }
            return null;
        }
        /// <summary>
        /// 模型是集合，返回自身
        /// </summary>
        /// <returns></returns>
        public List<CommonJsonModel> GetCollection()
        {
            List<CommonJsonModel> list = new List<CommonJsonModel>();
            if (IsValue())
                return list;
            foreach (string subjson in base._GetCollection(rawjson))
            {
                list.Add(new CommonJsonModel(subjson));
            }
            return list;
        }
 

        /// <summary>
        /// 当模型是值对象，返回key
        /// </summary>
        private string Key
        {
            get
            {
                if (IsValue())
                    return base._GetKey(rawjson);
                return null;
            }
        }
        /// <summary>
        /// 当模型是值对象，返回value
        /// </summary>
        private string Value
        {
            get
            {
                if (!IsValue())
                    return null;
                return base._GetValue(rawjson);
            }
        }
    }
}