需要先引用     Newtonsoft.Json.dll
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   | public void Test_json()         {             string a = "{\"input\":{\"size\":193156,\"type\":\"image/png\"},\"output\":{\"size\":59646,\"type\":\"image/png\",\"width\":487,\"height\":284,\"ratio\":0.3088,\"url\":\"https://api.tinify.com/output/hrqtghqtv0ab4qgv.png\"}}";                          Newtonsoft.Json.Linq.JObject jobject =                 (Newtonsoft.Json.Linq.JObject)Newtonsoft.Json.JsonConvert.DeserializeObject(a);             string input_size = Convert.ToString(jobject["output"]);             Console.WriteLine(input_size);         }
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