原文:
操作Json 和 SelectTokens with JsonPath
JsonPath expression:
| $ | the root object |
| @ | the current object |
| .. | recursive descent |
| [] | 下标操作符 |
| * | 通配符 |
| ?() | filter 条件 |
JToken. SelectToken
SelectToken是JToken上的一个方法，它采用字符串路径到child token。如果在路径的位置找不到child token.，则SelectToken将返回子child token或空引用。 该路径由以句点分隔的属性名称和数组索引组成，e.g. Manufacturers[0].Name.
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JObject o = JObject.Parse(@"{
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'Stores': [
-
'Lambton Quay',
-
'Willis Street'
-
],
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'Manufacturers': [
-
{
-
'Name':
'Acme Co',
-
'Products': [
-
{
-
'Name':
'Anvil',
-
'Price':
50
-
}
-
]
-
},
-
{
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'Name':
'Contoso',
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'Products': [
-
{
-
'Name':
'Elbow Grease',
-
'Price':
99.95
-
},
-
{
-
'Name':
'Headlight Fluid',
-
'Price':
4
-
}
-
]
-
}
-
]
-
}
");
-
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string name = (string)o.SelectToken("Manufacturers[
0].Name
");
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// Acme Co
-
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decimal productPrice = (decimal)o.SelectToken("Manufacturers[
0].Products[
0].Price
");
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// 50
-
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string productName = (string)o.SelectToken("Manufacturers[
1].Products[
0].Name
");
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// Elbow Grease
JToken. SelectTokens with jsonPath
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JObject o = JObject.Parse(@"{
-
'Stores': [
-
'Lambton Quay',
-
'Willis Street'
-
],
-
'Manufacturers': [
-
{
-
'Name':
'Acme Co',
-
'Products': [
-
{
-
'Name':
'Anvil',
-
'Price':
50
-
}
-
]
-
},
-
{
-
'Name':
'Contoso',
-
'Products': [
-
{
-
'Name':
'Elbow Grease',
-
'Price':
99.95
-
},
-
{
-
'Name':
'Headlight Fluid',
-
'Price':
4
-
}
-
]
-
}
-
]
-
}
");
-
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// manufacturer with the name 'Acme Co'
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JToken acme = o.SelectToken("$.Manufacturers[?(@.Name ==
'Acme Co')]
");
-
-
Console.WriteLine(acme);
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// { "Name
": "Acme Co
", Products: [{ "Name
": "Anvil
", "Price
": 50 }] }
-
-
// name of all products priced 50 and above
-
IEnumerable<JToken> pricyProducts = o.SelectTokens("$..Products[?(@.Price >=
50)].Name
");
-
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foreach (JToken item in pricyProducts)
-
{
-
Console.WriteLine(item);
-
}
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// Anvil
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// Elbow Grease
select Token with Linq
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IList<string> storeNames = o.SelectToken(
"Stores").Select(
s => (string)s).ToList();
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// Lambton Quay
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// Willis Street
-
-
IList<string> firstProductNames = o[
"Manufacturers"].Select(
m => (string)m.SelectToken(
"Products[1].Name")).ToList();
-
// null
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// Headlight Fluid
-
-
decimal totalPrice = o[
"Manufacturers"].Sum(
m => (decimal)m.SelectToken(
"Products[0].Price"));
-
// 149.95
我在项目中遇到的问题是：model下面有很多id,我需要根据传入的多个id去找：
来源：oschina
链接：https://my.oschina.net/u/4267086/blog/4279713