一、业务背景
最近项目需要与U8c对接，实现增删改查，借此机会，梳理一下C#解析Json字符串的问题。
这篇文章，先以查询接口为例。
二、查询接口
首先以一个查询接口为例。
访问U8c接口
string res = sendPost(url, strdata, trantype, system, username, password);
查看接口返回的数据
由于方法返回的是字符串
我们查看接口返回数据
我们可以看到，字符串数据。
所以第一步，需要将字符串转为JSON对象
JObject res_obj = JObject.Parse(res);
JObject.Parse 是一个.NET库中的方法，用于将字符串转换为 JSON 对象。它可以解析符合 JSON 格式的字符串，并将其转换为 JObject 对象，以便在代码中进行处理和操作。这个方法在开发中常用于处理 JSON 数据。例如：
string jsonString = “{“name”:“John”,“age”:30,“city”:“New York”}”;
JObject jsonObject = JObject.Parse(jsonString);
通过使用 JObject.Parse，我们可以将 jsonString 字符串解析为 JSON 对象，并且可以通过键值对的方式访问和操作其中的属性。
看一下效果
拿出来看一下
{
{
"status": "success",
"data": "{\"allcount\":2,\"retcount\":2,\"queryallsql\":\"select pk_invbasdoc from bd_invbasdoc where 1=1\",\"datas\":[{\"parentvo\":{\"pk_corp\":\"0001\",\"invcode\":\"TEST01\",\"invname\":\"灭火器\",\"pk_invcl\":\"0001F8100000000009RX\",\"invclcode\":\"39\",\"invclname\":\"安全环保\",\"pk_measdoc\":\"0001F810000000000PM5\",\"meascode\":\"1\",\"measname\":\"台\",\"pk_taxitems\":\"40040000000000000077\",\"taxitemscode\":\"2909\",\"taxitemsname\":\"其它采掘业\",\"unitvolume\":\"0.00000000\",\"unitweight\":\"0.00000000\",\"laborflag\":false,\"discountflag\":false,\"setpartsflag\":false,\"asset\":false,\"iselectrans\":false,\"isretail\":false,\"assistunit\":false,\"autobalancemeas\":false,\"ismngstockbygrswt\":false,\"isstorebyconvert\":false,\"creator\":\"17799197770\",\"creatorname\":\"陈疆\",\"createtime\":\"2023-12-14 20:06:17\",\"sealflag\":false,\"pk_invbasdoc\":\"0001F810000000000PM8\",\"ts\":\"2023-12-14 20:06:17\",\"dr\":\"0\"},\"childrenvo\":[]},{\"parentvo\":{\"pk_corp\":\"0001\",\"invcode\":\"802601001\",\"invname\":\"化工焦\",\"pk_invcl\":\"0001F8100000000009SM\",\"invclcode\":\"802601\",\"invclname\":\"焦炭-化工焦\",\"pk_measdoc\":\"0001F810000000000PM7\",\"meascode\":\"2\",\"measname\":\"吨\",\"pk_taxitems\":\"40040000000000000042\",\"taxitemscode\":\"1101\",\"taxitemsname\":\"生铁\",\"unitvolume\":\"0.00000000\",\"unitweight\":\"0.00000000\",\"laborflag\":false,\"discountflag\":false,\"setpartsflag\":false,\"asset\":false,\"iselectrans\":false,\"isretail\":false,\"assistunit\":false,\"autobalancemeas\":false,\"ismngstockbygrswt\":false,\"isstorebyconvert\":false,\"creator\":\"17799197770\",\"creatorname\":\"陈疆\",\"createtime\":\"2023-12-14 20:07:07\",\"sealflag\":false,\"pk_invbasdoc\":\"0001F810000000000PMB\",\"ts\":\"2023-12-14 20:07:07\",\"dr\":\"0\"},\"childrenvo\":[]}]}",
"taskNumber": "202312150024"
}
}
我们得到JObject对象之后，开始取值
foreach (JObject item in datas)
{
// 在这里可以对 item 进行操作
}
我们取出status,判断状态是否成功，如果成功，将data值拿出
string data = res_obj.Value<string>("data");
其实从返回的数据，我们就可以看到
data里面的数据是字符串，我们再次转成JObject对象。
JObject data_obj = JObject.Parse(data);
然后取值。
JArray datas = data_obj.Value<JArray>("datas");
拿出来看一看
{
[{
"parentvo": {
"pk_corp": "0001",
"invcode": "TEST01",
"invname": "灭火器",
"pk_invcl": "0001F8100000000009RX",
"invclcode": "39",
"invclname": "安全环保",
"pk_measdoc": "0001F810000000000PM5",
"meascode": "1",
"measname": "台",
"pk_taxitems": "40040000000000000077",
"taxitemscode": "2909",
"taxitemsname": "其它采掘业",
"unitvolume": "0.00000000",
"unitweight": "0.00000000",
"laborflag": false,
"discountflag": false,
"setpartsflag": false,
"asset": false,
"iselectrans": false,
"isretail": false,
"assistunit": false,
"autobalancemeas": false,
"ismngstockbygrswt": false,
"isstorebyconvert": false,
"creator": "17799197770",
"creatorname": "xx",
"createtime": "2023-12-14 20:06:17",
"sealflag": false,
"pk_invbasdoc": "0001F810000000000PM8",
"ts": "2023-12-14 20:06:17",
"dr": "0"
},
"childrenvo": []
},
{
"parentvo": {
"pk_corp": "0001",
"invcode": "802601001",
"invname": "化工焦",
"pk_invcl": "0001F8100000000009SM",
"invclcode": "802601",
"invclname": "焦炭-化工焦",
"pk_measdoc": "0001F810000000000PM7",
"meascode": "2",
"measname": "吨",
"pk_taxitems": "40040000000000000042",
"taxitemscode": "1101",
"taxitemsname": "生铁",
"unitvolume": "0.00000000",
"unitweight": "0.00000000",
"laborflag": false,
"discountflag": false,
"setpartsflag": false,
"asset": false,
"iselectrans": false,
"isretail": false,
"assistunit": false,
"autobalancemeas": false,
"ismngstockbygrswt": false,
"isstorebyconvert": false,
"creator": "17799197770",
"creatorname": "xx",
"createtime": "2023-12-14 20:07:07",
"sealflag": false,
"pk_invbasdoc": "0001F810000000000PMB",
"ts": "2023-12-14 20:07:07",
"dr": "0"
},
"childrenvo": []
}
]
}
下面是一个数组
使用for循环，进行取值
foreach (JObject item in datas)
{
}
取出第一个Jobject对象的parentvo的值
JObject parentvo = item.Value<JObject>("parentvo");
拿出字段值
invclcode = parentvo.Value<string>("invcode");
invclname = parentvo.Value<string>("invclname");
看一下是否取成功
成功！！！
三、完整代码
查询方法：
public ActionResult WLQuery()
{
string url = "http://xxxxx/u8cloud/api/uapbd/invbasdoc/query";
string username = "xx";
string password = "5xx70e2bf5xx84exx2c731a";
string system = "xxxx";
string trantype = "undefined";
string strdata = string.Empty;
string invclcode = string.Empty;//cinvclasscode 存货分类编码
string invclname = string.Empty;//cinvclassname存货分类名称
string invshortname = string.Empty;//cinvname 存货简称
string invspec = "";//cinvstd 型号
string meascode = "";//cunit 主计量单位
string creator = string.Empty;//创建人
string creatorname = string.Empty;//cmaker 创建人名称
string createtime = string.Empty;
string sql = string.Empty;
IDatabase db = DataFactory.Database();
DbTransaction trans = db.BeginTrans();
var data_in = new
{
};
strdata = JsonConvert.SerializeObject(data_in);
strdata = strdata.Replace("null", "");
string res = sendPost(url, strdata, trantype, system, username, password);
JObject res_obj = JObject.Parse(res);
if(res_obj.Value<string>("status").ToString() == "success")
{
string data = res_obj.Value<string>("data");
JObject data_obj = JObject.Parse(data);
JArray datas = data_obj.Value<JArray>("datas");
foreach (JObject item in datas)
{
JObject parentvo = item.Value<JObject>("parentvo");
invclcode = parentvo.Value<string>("invcode");
invclname = parentvo.Value<string>("invclname");
invshortname = parentvo.Value<string>("invshortname");
invspec = parentvo.Value<string>("invspec");
meascode = parentvo.Value<string>("measname");
creator = parentvo.Value<string>("creator");
creatorname = parentvo.Value<string>("creatorname");
createtime = parentvo.Value<string>("createtime");
sql = $"insert into ba_inventory_e (id,ddate,cinvclasscode,cinvclassname,cinvname,cinvstd,cunit,cmaker) values(newid(),'{createtime}','{invclcode}','{invclname}','{invshortname }','{invspec}','{meascode}','{creatorname}')";
string isOK = db.ExecuteSql(new StringBuilder(sql));
if (!"OK".Equals(isOK.ToUpper()))
{
return Content(new JsonMessage { Success = false, Code = "-1", Message = "插入物料档案失败！" + isOK }.ToJson());
db.Rollback();
}
}
}
db.Commit();
return Content(new JsonMessage { Success = true, Code = "1", Message = "U8C物料档案查询并录入OA系统成功！" }.ToJson());
}
http访问方法
public string sendPost(string url, string json, string trantype, string system, string usercode, string password)
{
System.IO.Stream stream = null;
StreamReader reader = null;
try
{
Encoding encoding = Encoding.UTF8;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.Accept = "text/html, application/xhtml+xml, */*";
request.ContentType = "application/json";
request.Headers["trantype"] = trantype;
request.Headers["system"] = system;
request.Headers["usercode"] = usercode;
request.Headers["password"] = password;
byte[] buffer = encoding.GetBytes(json);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
return reader.ReadToEnd();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
//if (writer != null) writer.Close();
if (stream != null) stream.Close();
if (reader != null) reader.Close();
}
return null;
}
