将json格式的string转化为对象

Posted 2020-09-16 王炜忠

 

（1）

       private void button1_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");
            sb.Append("\"search\": null,");
            sb.Append("\"totalCount\": 2,");
            sb.Append("\"list\": [");
            sb.Append("{");
            sb.Append("\"id\": \"DE\",");
            sb.Append("\"name\": \"Herz\"");
            sb.Append("},");
            sb.Append("{");
            sb.Append("\"id\": \"E_0\",");
            sb.Append("\"name\": \"Sciences\"");
            sb.Append("}");
            sb.Append("],");
            sb.Append("\"indexId\": null,");
            sb.Append("\"success\": true");
            sb.Append("}");
            //将json对象解析成一个类，注意名称和数据类型必须相符。简便方法：VS的“编辑”-->“选择性粘贴”-->“将JSON粘贴为类”，系统自动生成

            #region 方法一:Newtonsoft.Json.JsonConvert.DeserializeObject<>
            ClassObject co = Newtonsoft.Json.JsonConvert.DeserializeObject<ClassObject>(sb.ToString());
            MessageBox.Show(co.list.Length.ToString());//输出2
            #endregion

            #region 方法二：System.Runtime.Serialization.Json.DataContractJsonSerializer
            //存储流
            System.IO.MemoryStream mstream = new System.IO.MemoryStream(Encoding.UTF8.GetBytes(sb.ToString()));
            //指定反序列化对象
            System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = new System.Runtime.Serialization.Json.DataContractJsonSerializer(typeof(ClassObject));
            //进行解析
            ClassObject cccoo = (ClassObject)serializer.ReadObject(mstream);
            MessageBox.Show(cccoo.list.Length.ToString());//输出
            #endregion
        }

        //电脑生成的：根据json格式的string解析的对象ClassObject和List
        public class ClassObject
        {
            public object search { get; set; }
            public int totalCount { get; set; }
            public List[] list { get; set; }
            public object indexId { get; set; }
            public bool success { get; set; }
        }

        public class List
        {
            public string id { get; set; }
            public string name { get; set; }
        }

 

（2）但是，电脑自动生成对象，在解析时并不全是能解析成功的。如下

        private void button1_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("[");
            sb.Append("{");
            sb.Append("\"code\": \"BL\",");
            sb.Append("\"title\": \"生物\"");
            sb.Append("},");
            sb.Append(" {");
            sb.Append("\"code\": \"CP\",");
            sb.Append("\"title\": \"外文\"");
            sb.Append("},");
            sb.Append("{");
            sb.Append("\"code\": \"GP\",");
            sb.Append("\"title\": \"计算\"");
            sb.Append("}");
            sb.Append("]");

             List<CodeTitle> ctlist = Newtonsoft.Json.JsonConvert.DeserializeObject<List<CodeTitle>>(sb.ToString());
             MessageBox.Show(ctlist.Count.ToString());//输出3


            //此处会报错：电脑自动生成的对象并不全是对的。
            Rootobject r = Newtonsoft.Json.JsonConvert.DeserializeObject<Rootobject>(sb.ToString());


        }

        //自己手动写的：根据json格式的string解析的对象ClassObject和List
        class CodeTitle
        {
            public string code { get; set; }
            public string title { get; set; }
        }

        //电脑自动生成的Rootobject和Class1
        public class Rootobject
        {
            public Class1[] Property1 { get; set; }
        }

        public class Class1
        {
            public string code { get; set; }
            public string title { get; set; }
        }

 

完！