[英]How do you parse a JSON file using JSON.net
我試圖讀取一個JSON文件並解析它。 我有這個代碼從我的文件中讀取
StreamReader re = new StreamReader("artists.json");
JsonTextReader reader = new JsonTextReader(re);
但是我現在如何從讀者解析它以便我可以從文件中搜索數據?
我試過閱讀文檔但找不到任何東西
using Newtonsoft.Json;
//..
JsonSerializer se = new JsonSerializer();
object parsedData = se.Deserialize(reader);
回應“有關如何實施這一點的一些細節會有所幫助。 - aknatn”
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
public class Program
{
public static void Main()
{
//JSON = {"Property1":"as","CollectionProperty":[{"prop1":"1","prop2":"2","prop3":"3"}]}
//This Top part is just to build a stream
//- No need to do this if you are accessing a file
string JSON = "{\"Property1\":\"SomePropName\",\"CollectionProperty\":"+
"[{\"prop1\":\"1\",\"prop2\":\"2\",\"prop3\":\"3\"}]}";
byte[] byteArray = Encoding.UTF8.GetBytes(JSON);
//byte[] byteArray = Encoding.ASCII.GetBytes(contents);
MemoryStream stream = new MemoryStream(byteArray);
// convert stream to string
JsonSerializer se = new JsonSerializer();
StreamReader re = new StreamReader(stream);
JsonTextReader reader = new JsonTextReader(re);
var DeserializedObject = se.Deserialize<Collections>(reader);
Console.WriteLine(DeserializeObject.Property1);
//"...so I can search data from the file?"
//This is up to you and how you wanna handle it, but you now have JSON
//Deserialized and stored in memory. 'How to search' depends on objects class
//Also, Original question said he had the JSON. I would recommend using
//json2csharp.com/ or jsonutils.com/
//to retrieve the classes in order to Deserialize it to your object.
//Note 1: You don't always have to cast it
//- I just always try to if and when I can
//Note 2: Because you are using a StreamReader,
//this will account for Large JSON Objects
}
public class Collections
{
public List<CollectionProperty> CollectionProperty = new List<CollectionProperty>();
public string Property1;
}
public class CollectionProperty
{
public string prop1 { get; set; }
public string prop2 { get; set; }
public string prop3 { get; set; }
}
}
如果要將其加載到JObject或動態類型(而不是將其反序列化為.NET類型),可以使用JObject.Load方法
using(var sr = new StreamReader("artists.json"))
{
var reader = new JsonTextReader(sr);
var jObject = JObject.Load(reader);
//Get property from JObject
var someValue = jObject.GetValue("someProperty").Value<string>();
// JObject can be cast into a dynamic
var dObject = (dynamic)jObject;
someValue = (string)dObject.someProperty;
}
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