自定义实现Json字符串向C#对象转变的方法.doc

计算机交流平台：计算机故障_计算机论坛 wy自定义实现Json字符串向C#对象转变的方法这里使用Atrribute的方式实现了Json字符串向C#对象的转变。因为功能局限，此版本只是针对于Json字符串,如response:Hello,id:21231513,result:100,msg:OK.; 而不是Json数组。这里的Atrribute是作用在属性上，像NHibernate中的Atrribute一样，是在运行时通过反射来获取这个属性对应于Json字符串中的哪个key.csharpnamespace JsonMapperAttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)public class JsonFieldAttribute : Attributeprivate string _Name = string.Empty;public string Nameget return _Name; set _Name = value; 接下来是这个转换工具中的核心代码，主要是分解并且分析Json字符串中key与value, 并且通过反射获得对象中的各个对应属性并且赋值。csharpnamespace JsonMapperpublic class JsonToInstancepublic T ToInstance(string json) where T : new()Dictionary dic = new Dictionary();string fields = json.Split(,);for (int i = 0; i fields.Length; i+ )string keyvalue = fieldsi.Split(:);dic.Add(Filter(keyvalue0), Filter(keyvalue1);PropertyInfo properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);T entity = new T();foreach (PropertyInfo property in properties)object propertyAttrs = property.GetCustomAttributes(false);for (int i = 0; i propertyAttrs.Length; i+)object propertyAttr = propertyAttrsi;if (propertyAttr is JsonFieldAttribute)JsonFieldAttribute jsonFieldAttribute = propertyAttr as JsonFieldAttribute;foreach (KeyValuePair item in dic)if (item.Key = jsonFieldAttribute.Name)Type t = property.PropertyType;property.SetValue(entity, ToType(t, item.Value), null);break;return entity;private string Filter(string str)if (!(str.StartsWith() & str.EndsWith()return str;elsereturn str.Substring(1, str.Length - 2);public object ToType(Type type, string value)if (type = typeof(string)return value;MethodInfo parseMethod = null;foreach (MethodInfo mi in type.GetMethods(BindingFlags.Static| BindingFlags.Public)if (mi.Name = Parse & mi.GetParameters().Length = 1)parseMethod = mi;break;if (parseMethod = null)throw new ArgumentException(string.Format(Type: 0 has not Parse static method!, type);return parseMethod.Invoke(null, new object value );最后这是用于测试的代码csharppublic class Message/ result: 100, response: Who are you?!, id: 13185569, msg: OK. JsonField(Name = result)public int Result get; set; JsonField(Name = response)public string Response get; set; JsonField(Name = id)public int Id get; set; JsonField(Name = msg)public string Msg get; set; csharpclass Programstatic void Main(string args)JsonToInstance u