Json 操作

先將需要Deserialize的文件檔案建立類別Class
generate c# classes from json

線上的工具如
http://json2csharp.com/


讀取Json檔案
NuGet 下載Newtonsoft.Json套件

using (StreamReader r = new StreamReader(@"F:\Download\temp.json"))
{
       string json = r.ReadToEnd();
       RootObject items = JsonConvert.DeserializeObject<RootObject>(json);
}

解下來的item就可以使用

即時水位資料擷取範例：

網址：https://data.gov.tw/dataset/25768

Json格式資料網址：
https://data.wra.gov.tw/Service/OpenData.aspx?format=json&id=2D09DB8B-6A1B-485E-88B5-923A462F475C

資料內容：
{"RealtimeWaterLevel_OPENDATA":[
{"StationIdentifier":"1140H048","RecordTime":"2017-10-31T14:20:00","WaterLevel":"29.10"}
,{"StationIdentifier":"1140H049","RecordTime":"2017-10-31T14:00:00","WaterLevel":"22.24"}
,{"StationIdentifier":"1140H058","RecordTime":"2017-10-31T14:20:00","WaterLevel":"4.20"}
,{"StationIdentifier":"1140H066","RecordTime":"2017-10-31T14:20:00","WaterLevel":"2.11"}
]}
json2csharp 轉換為class

public class RealtimeWaterLevelOPENDATA
{
    public string StationIdentifier { get; set; }
    public DateTime RecordTime { get; set; }
    public string WaterLevel { get; set; }
}

public class RootObject
{
    public List<RealtimeWaterLevelOPENDATA>     RealtimeWaterLevel_OPENDATA { get; set; }
}

即時水位擷取程式碼：