C#でJsonを扱う DynamicJson編

2019-12-092020-06-07

・C#でJsonを扱う DynamicJson編
・C#でJsonを扱う Json.Net JToken/JObject/JArray編
・C#でJsonを扱う Json.Net DeserializeObject編
・C#でJsonを扱う System.Text.Json編

DynamicJsonについて

neue cc – DynamicJson – C# 4.0のdynamicでスムーズにJSONを扱うライブラリ

App.xaml

<Application x:Class="WpfApp13.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WpfApp13"
             StartupUri="ViewMainView.xaml">
    <Application.Resources>
         
    </Application.Resources>
</Application>

MainView.xaml

<Window x:Class="WpfApp13.View.MainView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
        xmlns:l="http://schemas.livet-mvvm.net/2011/wpf"
        xmlns:local="clr-namespace:WpfApp13.View"
        xmlns:vm="clr-namespace:WpfApp13.ViewModel"
        mc:Ignorable="d"
        Title="MainView" Height="200" Width="300">

    <Window.DataContext>
        <vm:MainViewModel/>
    </Window.DataContext>

    <i:Interaction.Triggers>
        <i:EventTrigger EventName ="ContentRendered">
            <l:LivetCallMethodAction MethodTarget="{Binding}" MethodName="OnContentRendered" />
        </i:EventTrigger>
    </i:Interaction.Triggers>

    <DataGrid ItemsSource="{Binding arrayWeather}">

    </DataGrid>
</Window>

MainViewModel.cs

using Codeplex.Data;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text.RegularExpressions;

namespace WpfApp13.ViewModel
{
    public class MainViewModel : Livet.ViewModel
    {
        private ObservableCollection<Entity.WeatherEntity> _arrayWeather;
        public ObservableCollection<Entity.WeatherEntity> arrayWeather
        {
            get
            {
                return _arrayWeather;
            }
            set
            {
                _arrayWeather = value;
                RaisePropertyChanged();
            }
        }

        public void OnContentRendered()
        {
            string strSource = "";

            using (System.Net.WebClient objWebClient = new System.Net.WebClient())
            {
                // JSONデータの取得
                strSource = objWebClient.DownloadString("http://weather.livedoor.com/forecast/webservice/json/v1?city=130010");
            }

            // Unicodeエスケープ文字を元に戻す
            strSource = Regex.Unescape(strSource);

            strSource = strSource.Replace("
", "");

            // DynamicJsonでパース
            dynamic dynJson = DynamicJson.Parse(strSource);

            dynamic dynForecasts = dynJson.forecasts;

            List<Entity.WeatherEntity> lstWeather = new List<Entity.WeatherEntity>();

            // 配列か否かの判定はIsArray
            if(dynForecasts.IsArray == true)
            {
                foreach(dynamic dynData in dynForecasts)
                {
                    Entity.WeatherEntity objWeatherEntity = new Entity.WeatherEntity();

                    // 定義の有無はIsDefined
                    if (dynData.IsDefined("dateLabel"))
                    {
                        // インデクサでアクセス
                        objWeatherEntity.DataLabel = dynData["dateLabel"];
                    }

                    // プロパティを直接指定してアクセス
                    objWeatherEntity.Telop = dynData.telop;
                    objWeatherEntity.Date = dynData.date;

                    lstWeather.Add(objWeatherEntity);
                }
            }

            arrayWeather = new ObservableCollection<Entity.WeatherEntity>(lstWeather);
        }
    }
}

WeatherEntity.cs

namespace WpfApp13.Entity
{
    public class WeatherEntity
    {
        public string DataLabel { get; set; }

        public string Telop { get; set; }

        public string Date { get; set; }

    }
}