一个JArray数组由JObject对象组成，往每个JObject对象添加一个键，怎么加呢

[goodgame365]

比如我有一个JArray数组 如下
[ {"a":1,"b":2}, {"a":1,"b":2},{"a":1,"b":2},]
现在我想需要加成这样
[ {"a":1,"b":2，"C":3}, {"a":1,"b":2，"C":3}, {"a":1,"b":2，"C":3}]

怎么加呢，请高人指点

[楠小南]

将对象数组投影到新的集合

   var Jarray = [ {"a":1,"b":2}, {"a":1,"b":2},{"a":1,"b":2},];

   var T = Jarray.Select(a=>new{a.a,a.b,c=3 }).tolist();

[shawn xia]

            JArray array = new JArray();
            array.Add(JObject.Parse("{ \"a\":1,\"b\":2}"));
            array.Add(JObject.Parse("{ \"a\":1,\"b\":2}"));
            array.Add(JObject.Parse("{ \"a\":1,\"b\":2}"));

            string json = array.ToString();
            //[{ "a":1,"b":2}, { "a":1,"b":2},{ "a":1,"b":2}]
            Console.WriteLine(json);

            array.ToList().ForEach(x=>((JObject)x).Add("c","3"));

            //[ { "a":1,"b":2，"c":3},  { "a":1,"b":2，"c":3}, { "a":1,"b":2，"c":3}]
            Console.WriteLine(array.ToString());

[MangGo雨]

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
 var str = "[ {\"a\":1,\"b\":2}, {\"a\":1,\"b\":2},{\"a\":1,\"b\":2}]";
            JArray j = JArray.Parse(str);
            for (int a = 0; a < j.Count; a++)
            {
                j.Add(new JProperty("c", 3));
            }
            string str2 = JsonConvert.SerializeObject(j);