[英]Linq to json filtering results with Where clause
我是json的新手。 我正在尝试使用linq过滤json数据到C#中的json查询。 我正在尝试从json数据中检索多个值:
string json= @"{
"parts": [
{
"attributes": {
"Motherboard": "Gigabyte GA-H81M-S2H",
"Max RAM": "16GB",
"Form Factor": "Micro ATX",
"RAM Slots": 2,
"Socket / CPU": "LGA1150"
},
"type": "Motherboard",
"name": "Gigabyte GA-H81M-S2H",
"slug": "gigabyte-motherboard-gah81ms2h"
},
{
"attributes": {
"Motherboard": "MSI H55-G43",
"Max RAM": "16GB",
"Form Factor": "ATX",
"RAM Slots": 4,
"Socket / CPU": "LGA1156"
},
"type": "Motherboard",
"name": "MSI H55-G43",
"slug": "msi-motherboard-h55g43"
},
{
"url": "http://pcpartpicker.com/part/asus-motherboard-rampageivblackedition",
"attributes": {
"Motherboard": "Asus Rampage IV Black Edition",
"Max RAM": "128GB",
"Form Factor": "EATX",
"RAM Slots": 8,
"Socket / CPU": "LGA2011"
},
"type": "Motherboard",
"name": "Asus Rampage IV Black Edition",
"slug": "asus-motherboard-rampageivblackedition"
}
],
}";
这是我的C#代码:
JObject results = JObject.Parse(json);
var categories = from c in results["parts"]["attributes"].Children()["Motherboard"].Values<string>()
group c by c
into g
orderby g.Count() descending
select new { Category = g.Key, Count = g.Count() };
我尝试使用此代码,但未返回任何结果。请让我知道我在哪里做错了,或者这是编写查询的正确方法。任何人都可以帮助我解决这个问题。
您可以将SelectTokens
用于这种性质的查询。 它支持JSONPath查询语法。 从而:
var categories = from c in results.SelectTokens("parts[*].attributes.Motherboard")
group c by c
into g
orderby g.Count() descending
select new { Category = (string)g.Key, Count = g.Count() };
在您的JSON中, "parts" : [...]
的值"parts" : [...]
是一个数组; 在查询中, "parts[*]"
是通配符,用于搜索数组的所有元素。
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