C# 调用API接口
参考链接：https://blog.csdn.net/qq_35913274/article/details/79194046
get post 请求两种方式，我挑选了一种简单的方式
关于C#代码调用API接口获取到json数据的简单方法：
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
string serviceAddress = "http://t.weather.sojson.com/api/weather/city/"+ 101270101;//请求URL地址
var data = client.DownloadString(serviceAddress);
var obj = JsonConvert.DeserializeObject<JObject>(data);
Console.Write(obj);
Console.ReadKey();
}
如果只是获取到json数据并没多大用处 需要对其解析;
http://json2csharp.chahuo.com/ 转json格式为C#类;
http://tool.chinaz.com/tools/jsonescape.aspx json格式的各种操作;
https://www.sojson.com/blog/305.html 天气API
下面以获取天气API信息为例：
该API返回数据格式如下：
{
"time": "2018-09-22 12:37:21",//系统更新时间
"cityInfo": {
"city": "天津市", //请求城市
"cityId": "101030100",//请求ID
"parent": "天津", //上级，一般是省份
"updateTime": "12:32"//天气更新时间
},
"date": "20180922", //当前天气的当天日期
"message": "Success !", //返回message
"status": 200, //返回状态
"data": {
"shidu": "22%", //湿度
"pm25": 15.0, //pm2.5
"pm10": 46.0, //pm10
"quality": "优", //空气质量
"wendu": "24", //温度
"ganmao": "各类人群可自由活动",//感冒提醒（指数）
"forecast": [//今天+未来14天
{
"date": "22",
"ymd": "2018-09-22", //年月日 （新增）
"week": "星期六", //星期 （新增）
"sunrise": "05:57",
"high": "高温 26.0℃",
"low": "低温 15.0℃",
"sunset": "18:10",
"aqi": 55.0,
"fx": "西北风",
"fl": "4-5级",
"type": "晴",
"notice": "愿你拥有比阳光明媚的心情"
},
{
"date": "23",
"ymd": "2018-09-22", //年月日 （新增）
"week": "星期日", //星期 （新增）
"sunrise": "05:58",
"high": "高温 23.0℃",
"low": "低温 14.0℃",
"sunset": "18:09",
"aqi": 29.0,
"fx": "西北风",
"fl": "4-5级",
"type": "晴",
"notice": "愿你拥有比阳光明媚的心情"
},
{
"date": "24",
"ymd": "2018-09-22", //年月日 （新增）
"week": "星期一", //星期 （新增）
"sunrise": "05:59",
"high": "高温 24.0℃",
"low": "低温 15.0℃",
"sunset": "18:07",
"aqi": 25.0,
"fx": "西北风",
"fl": "<3级",
"type": "晴",
"notice": "愿你拥有比阳光明媚的心情"
},
{
"date": "25",
"ymd": "2018-09-22", //年月日 （新增）
"week": "星期二", //星期 （新增）
"sunrise": "06:00",
"high": "高温 24.0℃",
"low": "低温 16.0℃",
"sunset": "18:05",
"aqi": 56.0,
"fx": "西南风",
"fl": "<3级",
"type": "晴",
"notice": "愿你拥有比阳光明媚的心情"
},
{
"date": "26",
"ymd": "2018-09-22", //年月日 （新增）
"week": "星期三", //星期 （新增）
"sunrise": "06:01",
"high": "高温 24.0℃",
"low": "低温 17.0℃",
"sunset": "18:04",
"aqi": 86.0,
"fx": "西南风",
"fl": "3-4级",
"type": "阴",
"notice": "不要被阴云遮挡住好心情"
}
]
}
}
生成接受返回数据的类
public class CityInfo
{
public string city { get; set; }
public string citykey { get; set; }
public string parent { get; set; }
public string updateTime { get; set; }
}
public class Forecast
{
public string date { get; set; }
public string high { get; set; }
public string low { get; set; }
public string ymd { get; set; }
public string week { get; set; }
public string sunrise { get; set; }
public string sunset { get; set; }
public string aqi { get; set; }
public string fx { get; set; }
public string fl { get; set; }
public string type { get; set; }
public string notice { get; set; }
}
public class Yesterday
{
public string date { get; set; }
public string high { get; set; }
public string low { get; set; }
public string ymd { get; set; }
public string week { get; set; }
public string sunrise { get; set; }
public string sunset { get; set; }
public string aqi { get; set; }
public string fx { get; set; }
public string fl { get; set; }
public string type { get; set; }
public string notice { get; set; }
}
public class Data
{
public string shidu { get; set; }
public string pm25 { get; set; }
public string pm10 { get; set; }
public string quality { get; set; }
public string wendu { get; set; }
public string ganmao { get; set; }
public List<Forecast> forecast { get; set; }
public Yesterday yesterday { get; set; }
}
public class RootObject
{
public string message { get; set; }
public string status { get; set; }
public string date { get; set; }
public string time { get; set; }
public CityInfo cityInfo { get; set; }
public Data data { get; set; }
}
然后调用接口获取指定格式的数据
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
string serviceAddress = "http://t.weather.sojson.com/api/weather/city/"+ 101270101;
var data = client.DownloadString(serviceAddress);
RootObject datas = JsonConvert.DeserializeObject<RootObject>(data);
Console.Write(datas.data.forecast[0].date);
Console.ReadKey();
}
然后就可以获取json里面的各种值;
Console.Write("更新时间是："+datas.time);
Console.Write("现在所处位置是："+datas.cityInfo.city);
foreach (var re in datas.data.forecast)
{
Console.WriteLine("现在是" + re.ymd + " " + re.week);
Console.WriteLine("最高温度" + re.high + "最低温度" + re.low);
}
读取json文件获取里面的城市code：
public static string Readjson(string city_name)
{
//读取自定目录下的json文件
StreamReader sr = new StreamReader(@"F:*****.json");
string json = sr.ReadToEnd();
//json文件转为 对象 T 创建的类 字段名 应该和json文件中的保持一致
var data = JsonConvert.DeserializeObject<RootObject>(json);
foreach(var re in data.re)
{
if(re.city_name.Contains(city_name))
{
return re.city_code;
}
}
return null;
}
城市文件的json类
public class Re
{
public string id { get; set; }
public string pid { get; set; }
public string city_code { get; set; }
public string city_name { get; set; }
public string post_code { get; set; }
public string area_code { get; set; }
public string ctime { get; set; }
}
public class RootObject
{
public List<Re> re { get; set; }
}
城市json文件:
链接：https://pan.baidu.com/s/1oWnQVRebpGNN43Bde_gDHA
提取码：5slx
又知道了新方法
其实可以不用生成类 直接用dynamic强类型转化 超方便
在 NuGet里面引用jil，而且jil效率还贼快 当然还是转化成类后面使用方便些.
using (var client = new WebClient())
{
client.Encoding = Encoding.UTF8;
string serviceAddress = "http://t.weather.sojson.com/api/weather/city/" + 101270101;
var data = client.DownloadString(serviceAddress);
//RootObject datas = JsonConvert.DeserializeObject(data);
var result = JSON.Deserialize<dynamic>(data);
Console.Write("更新时间是：" + result.time);
Console.Write("现在所处位置是：" + result.cityInfo.city);
}