Question

从网站metcheck我可以获取天气预报的json文件。 http://ws1.metcheck.com/ENGINE/v9_0/json.asp?lat=52.380&lon=0.060&Fc=Av

该文件回来了，但我无法读取该文件以获取所需的信息。我想我不了解metcheckData，predictLocation和Forecast之间的关系：

{
   "metcheckData":{
      "forecastLocation":{
         "forecast":[
            {
               "temperature":"18",
               "dewpoint":"13",
               "rain":"0.0",
               "freezinglevel":"3049",
               "uvIndex":"1",
               "totalcloud":"65",
               "lowcloud":"55",
               "medcloud":"43",
               "highcloud":"11",
               "humidity":"79",
               "windspeed":"11",
               "meansealevelpressure":"1012.77",
               "windgustspeed":"17",
               "winddirection":"249",
               "windletter":"WSW",
               "icon":"PC",
               "iconName":"Partly Cloudy",
               "chanceofrain":"0",
               "chanceofsnow":"0",
               "dayOfWeek":"4",
               "weekday":"Wednesday",
               "sunrise":"6:02",
               "sunset":"18:09",
               "cumulusBaseHeight":"540",
               "stratusBaseHeight":"549",
               "dayOrNight":"N",
               "utcTime":"2019-07-31T19:00:00.00"
            },
            {
               "temperature":"17",
               "dewpoint":"13",
               "rain":"0.1",
               "freezinglevel":"3192",
               "uvIndex":"0",
               "totalcloud":"91",
               "lowcloud":"66",
               "medcloud":"39",
               "highcloud":"35",
               "humidity":"82",
               "windspeed":"11",
               "meansealevelpressure":"1013.29",
               "windgustspeed":"17",
               "winddirection":"245",
               "windletter":"WSW",
               "icon":"RO",
               "iconName":"Intermittent Rain",
               "chanceofrain":"47",
               "chanceofsnow":"0",
               "dayOfWeek":"4",
               "weekday":"Wednesday",
               "sunrise":"6:02",
               "sunset":"18:09",
               "cumulusBaseHeight":"512",
               "stratusBaseHeight":"520",
               "dayOrNight":"N",
               "utcTime":"2019-07-31T20:00:00.00"
            }
         ],
         "continent":"",
         "country":"",
         "location":"52.4/0.1",
         "latitude":52.4,
         "longitude":0.1,
         "timezone":0
      }
      // Many other similar array entries omitted
   },
   "feedCreation":"2019-07-31T20:26:10.00",
   "feedCreator":"Metcheck.com",
   "feedModel":"GHX5",
   "feedModelRun":"00Z",
   "feedModelRunInitialTime":"2019-07-31T00:00:00.00",
   "feedResolution":"0.01"
}

使用使用Newtonsoft.Json; 使用Newtonsoft.Json.Linq;

我尝试了以下代码来读取诸如特定时间的温度预报之类的信息。

 JObject jo = JObject.Parse(File.ReadAllText(@"C:\temp\Weather.json", Encoding.UTF8));
 Dictionary<string, List<string>> values =
            jo.SelectToken("forecast", true).ToObject<Dictionary<string, List<string>>>();

 foreach (var kv in values)
 {
     rchtxtbx_output.AppendText(kv.Value[0] + "\r");

依此类推，以kv.Value [0]为温度，我将四舍五入并获取每小时的温度。不幸的是，情况并非如此，我在

时遇到错误

Dictionary<string, List<string>> values =
                jo.SelectToken("forecast", true).ToObject<Dictionary<string, List<string>>>();

所以一些“预测”是不正确的。我还尝试了metcheckData.forecastLocation.forecast然后预报Forecast.forecast，但是都出错了。

请问我如何从json文件中获取数据并将其写入每小时预测的丰富文本框中。

Answer 1

您要通过其父标记导航到所需的标记。然后获取令牌的子级列表。

JObject jo = JObject.Parse(File.ReadAllText(@"C:\temp\Weather.json", Encoding.UTF8));

// navigate to the token via its parents
List<JToken> items = jo.SelectToken("metcheckData", true).SelectToken("forecastLocation", true).SelectToken("forecast", true).Children().ToList();

foreach (JToken token in items)    
{
    string temperature = token["temperature"].Value<string>();
    string dewpoint = token["dewpoint"].Value<string>();
    // etc...
}

Answer 2

为什么不创建映射类并将JSON解析到该对象。完成之后，您可以浏览所有属性并选择所需的所有内容。

var data = JsonConvert.DeserializeObject<Rootobject>(File.ReadAllText(@"C:\temp\Weather.json", Encoding.UTF8));

public class Rootobject
{
    public Metcheckdata metcheckData { get; set; }
    public DateTime feedCreation { get; set; }
    public string feedCreator { get; set; }
    public string feedModel { get; set; }
    public string feedModelRun { get; set; }
    public DateTime feedModelRunInitialTime { get; set; }
    public string feedResolution { get; set; }
}

public class Metcheckdata
{
    public Forecastlocation forecastLocation { get; set; }
}

public class Forecastlocation
{
    public Forecast[] forecast { get; set; }
    public string continent { get; set; }
    public string country { get; set; }
    public string location { get; set; }
    public float latitude { get; set; }
    public float longitude { get; set; }
    public int timezone { get; set; }
}

public class Forecast
{
    public string temperature { get; set; }
    public string dewpoint { get; set; }
    public string rain { get; set; }
    public string freezinglevel { get; set; }
    public string uvIndex { get; set; }
    public string totalcloud { get; set; }
    public string lowcloud { get; set; }
    public string medcloud { get; set; }
    public string highcloud { get; set; }
    public string humidity { get; set; }
    public string windspeed { get; set; }
    public string meansealevelpressure { get; set; }
    public string windgustspeed { get; set; }
    public string winddirection { get; set; }
    public string windletter { get; set; }
    public string icon { get; set; }
    public string iconName { get; set; }
    public string chanceofrain { get; set; }
    public string chanceofsnow { get; set; }
    public string dayOfWeek { get; set; }
    public string weekday { get; set; }
    public string sunrise { get; set; }
    public string sunset { get; set; }
    public string cumulusBaseHeight { get; set; }
    public string stratusBaseHeight { get; set; }
    public string dayOrNight { get; set; }
    public DateTime utcTime { get; set; }
}

Answer 3

如果您从链接中获取json并忽略def appName = "Engage"; /** * Get the version name from command line param * * @return int If the param -PversionName is present then return int value or -1 */ def getAppName = { env -> return (env ? appName + " ("+ env + ")" : appName); } /** * Get the version name from command line param * * @return int If the param -PversionName is present then return int value or -1 */ def getLauncher = { env -> return (env ? "engage-" + env + ".nfib.org" : "engage.nfib.org"); } android { compileSdkVersion rootProject.ext.compileSdkVersion compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } flavorDimensions "default" defaultConfig { applicationId "com.nfib.engage" minSdkVersion rootProject.ext.minSdkVersion targetSdkVersion rootProject.ext.targetSdkVersion versionCode 1 versionName "1.0" } splits { abi { reset() enable enableSeparateBuildPerCPUArchitecture universalApk false // If true, also generate a universal APK include "armeabi-v7a", "x86", "arm64-v8a", "x86_64" } } signingConfigs { debug { storeFile file('debug.keystore') storePassword 'android' keyAlias 'androiddebugkey' keyPassword 'android' } } buildTypes { debug { signingConfig signingConfigs.debug } release { // Caution! In production, you need to generate your own keystore file. // see https://facebook.github.io/react-native/docs/signed-apk-android. signingConfig signingConfigs.debug minifyEnabled enableProguardInReleaseBuilds proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro" } } productFlavors { dev { dimension 'default' resValue "string", "app_name", getAppName("INT") resValue "string", "link_launcher", getLauncher("dv") applicationIdSuffix ".dv" manifestPlaceholders = [onesignal_app_id: "b78285eb-f1ec-46f3-9ad0-c7efe691a401", onesignal_google_project_number: "584236827312"] } qa { dimension 'default' resValue "string", "app_name", getAppName("QA") resValue "string", "link_launcher", getLauncher("qa") applicationIdSuffix ".qa" manifestPlaceholders = [onesignal_app_id: "e4280f5e-62ec-41a4-bd86-f5b94e471a36", onesignal_google_project_number: "162802054510"] } ua { dimension 'default' resValue "string", "app_name", getAppName("UA") resValue "string", "link_launcher", getLauncher("ua") applicationIdSuffix ".ua" manifestPlaceholders = [onesignal_app_id: "2ffd8dc0-9c6b-4035-999d-fc694194725a", onesignal_google_project_number: "594905904045"] } prod { dimension 'default' resValue "string", "app_name", getAppName() resValue "string", "link_launcher", getLauncher() manifestPlaceholders = [onesignal_app_id: "82dcb42f-1d35-4b79-bc28-2d1d02dbda36", onesignal_google_project_number: "601125149914"] } }部分，您将获得以下信息：

forecast

由此，（对我而言）变得更加明显，{ "metcheckData": { "forecastLocation": { "forecast": [], "continent": "", "country": "", "location": "52.4/0.1", "latitude": 52.4, "longitude": 0.1, "timezone": 0 } }, "feedCreation": "2019-07-31T20:17:52.00", "feedCreator": "Metcheck.com", "feedModel": "GHX5", "feedModelRun": "00Z", "feedModelRunInitialTime": "2019-07-31T00:00:00.00", "feedResolution": "0.01" }和metacheckData都是对象，而forecastLocation数组是forecast的属性。 / p>

我将使用forecastLocation。选中this和this post

所以它可能会变成这样（未经测试）：

dynamics

从嵌套的json文件中获取信息

3 个答案: