JsonPath with Newtonsoft.JSON

问题

I tried for nearly an hour different approaches, but I don't get it ;(

my JSON object is this:

"typeOfHair": {
    "value": [
        {
            "code": "Dry Hair",
            "values": [
                {
                    "value": "DryHair",
                    "language": "en"
                },
                {
                    "value": "TrockenesHaar",
                    "language": "de"
                }
            ]
        },
        {
            "code": "Any Type of Hair",
            "values": [
                {
                    "value": "AnyTypeOfHair",
                    "language": "en"
                },
                {
                    "value": "JedenHaartyp",
                    "language": "de"
                }
            ]
        }
    ]
}

And my task is to get with Newtonsoft.JSON all values where the language is "de". My current approach is:

JsonObject.SelectTokens("typeOfHair.value.values[?(@.language == 'de')].value").ToList()

Can someone help me with this?

Kind regards

回答1:

You're very close. You need to account for the outer value array typeOfHair.value[] by using the JsonPATH wildcard operator [*]:

var values = JsonObject.SelectTokens("typeOfHair.value[*].values[?(@.language == 'de')].value")
    // Convert from JValue to string
    .Select(v => (string)v)
    // Save in a list
    .ToList();

And, the result is:

["TrockenesHaar","JedenHaartyp"]

Sample fiddle.

回答2:

I know the OP specified JSONPath explicitly but for the sake of completeness below is how to achieve the same with LINQ to JSON:

var values = jObject["typeOfHair"]["value"]
    .SelectMany(v => v["values"])
    .Where(v => (string)v["language"] == "de")
    .Select(v => (string)v["value"])
    .ToList();

Demo: https://dotnetfiddle.net/1S4sT4

来源：https://stackoverflow.com/questions/43458453/jsonpath-with-newtonsoft-json

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jsonpath