这个json winform怎么编写实体类，如何解析

winform把这个json编写一个实体类
{
"errcode":0,
"errmsg":"ok",
"datas":[
{
"base_info":{
"date":1599062400,
"record_type":1,
"name":"张三",
"name_ex":"Three Zhang",
"departs_name":"有家企业/realempty;有家企业;有家企业/部门A4",
"acctid":"ZhangSan",
"rule_info":{
"groupid":10,
"groupname":"规则测试",
"scheduleid":0,
"schedulename":"",
"checkintime":[
{
"work_sec":38760,
"off_work_sec":38880
}
]
},
"day_type":0
},
"summary_info":{
"checkin_count":2,
"regular_work_sec":31,
"standard_work_sec":120,
"earliest_time":38827,
"lastest_time":38858
},
"holiday_infos":[
{
"sp_description":{
"data":[
{
"lang":"zh_CN",
"text":"09/03 10:0009/03 10:01"
}
]
},
"sp_number":"202009030002",
"sp_title":{
"data":[
{
"lang":"zh_CN",
"text":"请假0.1小时"
}
]
}
},
{
"sp_description":{
"data":[
{
"lang":"zh_CN",
"text":"08/25 14:3709/10 14:37"
}
]
},
"sp_number":"202008270004",
"sp_title":{
"data":[
{
"lang":"zh_CN",
"text":"加班17.0小时"
}
]
}
}
],
"exception_infos":[
{
"count":1,
"duration":60,
"exception":1
},
{
"count":1,
"duration":60,
"exception":2
}
],
"ot_info":{
"ot_status":1,
"ot_duration":3600,
"exception_duration":[

            ]
        },
        "sp_items":[
            {
                "count":1,
                "duration":360,
                "time_type":0,
                "type":1,
                "vacation_id":2,
                "name":"年假",
            },
            {
                "count":0,
                "duration":0,
                "time_type":0,
                "type":100,
                "vacation_id":0，
                "name":"外勤次数"
            }
        ]
    }
]

}

大致过程是这样

string json = "";
var rj = JsonConvert.DeserializeObject<ReturnData>(json);  //根据对象解析对应的json 

//根据json 定义对应的字段名（注意类型，数组或是对象）无需解析所有字段，只取你需要读取数据的字段即可
public class ReturnData
{
     public List<xx> xx { get; set; }
}