public static void UsingTheParentOperator()
{
string jsonString = @"
[
{
""title"": ""A Wild Sheep Chase"",
""reviews"": [{""rating"": 4, ""reviewer"": ""Nan""}]
},
{
""title"": ""The Night Watch"",
""reviews"": [{""rating"": 5, ""reviewer"": ""Alan""},
{""rating"": 3,""reviewer"": ""Anne""}]
},
{
""title"": ""The Comedians"",
""reviews"": [{""rating"": 4, ""reviewer"": ""Lisa""},
{""rating"": 5, ""reviewer"": ""Robert""}]
}
]
";
using JsonDocument doc = JsonDocument.Parse(jsonString);
var serializerOptions = new JsonSerializerOptions()
{
WriteIndented = true
};
Console.WriteLine("Retrieve selected nodes");
IList <JsonElement> results = JsonSelector.Select(doc.RootElement, "$[*].reviews[?(@.rating == 5)]");
Console.WriteLine(JsonSerializer.Serialize(results, serializerOptions));
Console.WriteLine();
Console.WriteLine("Retrieve parents of selected nodes");
IList <JsonElement> results1 = JsonSelector.Select(doc.RootElement, "$[*].reviews[?(@.rating == 5)]^");
Console.WriteLine(JsonSerializer.Serialize(results1, serializerOptions));
Console.WriteLine();
Console.WriteLine("Retrieve grandparents of selected nodes");
IList <JsonElement> results2 = JsonSelector.Select(doc.RootElement, "$[*].reviews[?(@.rating == 5)]^^");
Console.WriteLine(JsonSerializer.Serialize(results2, serializerOptions));
Console.WriteLine();
}
public static void UnionOfSeparateJsonPathExpressions()
{
string jsonString = @"
{
""firstName"": ""John"",
""lastName"" : ""doe"",
""age"" : 26,
""address"" : {
""streetAddress"": ""naist street"",
""city"" : ""Nara"",
""postalCode"" : ""630-0192""
},
""phoneNumbers"": [
{
""type"" : ""iPhone"",
""number"": ""0123-4567-8888""
},
{
""type"" : ""home"",
""number"": ""0123-4567-8910""
}
]
}
";
using JsonDocument doc = JsonDocument.Parse(jsonString);
var serializerOptions = new JsonSerializerOptions()
{
WriteIndented = true
};
Console.WriteLine("Union of separate JSONPath expressions");
IList <JsonElement> results1 = JsonSelector.Select(doc.RootElement, @"$..[@.firstName,@.address.city]");
Console.WriteLine(JsonSerializer.Serialize(results1, serializerOptions));
Console.WriteLine();
}
public static void KeyOfInterest()
{
string jsonString = @"
{
""Data"":[
{
""KeyOfInterest"":true,
""AnotherKey"":true
},
{
""KeyOfInterest"":false,
""AnotherKey"":true
},
{
""KeyOfInterest"":true,
""AnotherKey"":true
}
]
}
";
using JsonDocument doc = JsonDocument.Parse(jsonString);
IList <JsonElement> results1 = JsonSelector.Select(doc.RootElement,
"$.Data[*].KeyOfInterest");
IList <JsonElement> results2 = JsonSelector.Select(doc.RootElement,
"$.Data[*]['KeyOfInterest', 'AnotherKey']");
Console.WriteLine("Key of Interest");
Console.WriteLine("(1)");
Console.WriteLine(JsonSerializer.Serialize(results1));
Console.WriteLine("(2)");
Console.WriteLine(JsonSerializer.Serialize(results2));
Console.WriteLine();
}
public static void StoreExample()
{
string jsonString = @"
{ ""store"": {
""book"": [
{ ""category"": ""reference"",
""author"": ""Nigel Rees"",
""title"": ""Sayings of the Century"",
""price"": 8.95
},
{ ""category"": ""fiction"",
""author"": ""Evelyn Waugh"",
""title"": ""Sword of Honour"",
""price"": 12.99
},
{ ""category"": ""fiction"",
""author"": ""Herman Melville"",
""title"": ""Moby Dick"",
""isbn"": ""0-553-21311-3"",
""price"": 8.99
},
{ ""category"": ""fiction"",
""author"": ""J. R. R. Tolkien"",
""title"": ""The Lord of the Rings"",
""isbn"": ""0-395-19395-8"",
""price"": 22.99
}
],
""bicycle"": {
""color"": ""red"",
""price"": 19.95
}
}
}
";
using JsonDocument doc = JsonDocument.Parse(jsonString);
var serializerOptions = new JsonSerializerOptions()
{
WriteIndented = true
};
Console.WriteLine(@"(1) The authors of all books in the store");
IList <JsonElement> results1 = JsonSelector.Select(doc.RootElement, "$.store.book[*].author");
Console.WriteLine(JsonSerializer.Serialize(results1, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(2) All authors");
IList <JsonElement> results2 = JsonSelector.Select(doc.RootElement, "$..author");
Console.WriteLine(JsonSerializer.Serialize(results2, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(3) All things in store - some books and a red bicycle");
IList <JsonElement> results3 = JsonSelector.Select(doc.RootElement, "$.store.*");
Console.WriteLine(JsonSerializer.Serialize(results3, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(4) The price of everything in the store.");
IList <JsonElement> results4 = JsonSelector.Select(doc.RootElement, "$.store..price");
Console.WriteLine(JsonSerializer.Serialize(results4, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(5) The third book");
IList <JsonElement> results5 = JsonSelector.Select(doc.RootElement, "$..book[2]");
Console.WriteLine(JsonSerializer.Serialize(results5, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(6) The last book");
IList <JsonElement> results6 = JsonSelector.Select(doc.RootElement, "$..book[-1]");
Console.WriteLine(JsonSerializer.Serialize(results6, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(7) The first two books");
IList <JsonElement> results7 = JsonSelector.Select(doc.RootElement, "$..book[:2]");
Console.WriteLine(JsonSerializer.Serialize(results7, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(8) Filter all books with isbn number");
IList <JsonElement> results8 = JsonSelector.Select(doc.RootElement, "$..book[?(@.isbn)]");
Console.WriteLine(JsonSerializer.Serialize(results8, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(9) Filter all books with prices between 5 and 10");
IList <JsonElement> results9 = JsonSelector.Select(doc.RootElement, "$..book[?(@.price >= 5 && @.price < 10)]");
Console.WriteLine(JsonSerializer.Serialize(results9, serializerOptions));
Console.WriteLine();
Console.WriteLine(@"(10) All books with authors that match ""evelyn"" (ignore case)");
IList <JsonElement> results10 = JsonSelector.Select(doc.RootElement, "$..book[?(@.author =~ /evelyn.*?/i)]");
Console.WriteLine(JsonSerializer.Serialize(results10, serializerOptions));
Console.WriteLine();
}
public static void UsingFunctionsInFilters()
{
string jsonString = @"
{
""books"":
[
{
""category"": ""fiction"",
""title"" : ""A Wild Sheep Chase"",
""author"" : ""Haruki Murakami"",
""price"" : 22.72
},
{
""category"": ""fiction"",
""title"" : ""The Night Watch"",
""author"" : ""Sergei Lukyanenko"",
""price"" : 23.58
},
{
""category"": ""fiction"",
""title"" : ""The Comedians"",
""author"" : ""Graham Greene"",
""price"" : 21.99
},
{
""category"": ""fiction"",
""author"": ""J. R. R. Tolkien"",
""title"": ""The Lord of the Rings""
}
]
}
";
using JsonDocument doc = JsonDocument.Parse(jsonString);
var serializerOptions = new JsonSerializerOptions()
{
WriteIndented = true
};
Console.WriteLine("(1) All books whose author's last name is 'Tolkien'");
IList <JsonElement> results1 = JsonSelector.Select(doc.RootElement, @"$.books[?(tokenize(@.author,'\\s+')[-1] == 'Tolkien')]");
Console.WriteLine(JsonSerializer.Serialize(results1, serializerOptions));
Console.WriteLine();
Console.WriteLine("(2) All titles whose price is greater than the average price");
IList <JsonElement> results2 = JsonSelector.Select(doc.RootElement, @"$.books[?(@.price > avg($.books[*].price))].title");
Console.WriteLine(JsonSerializer.Serialize(results2, serializerOptions));
Console.WriteLine();
Console.WriteLine("(3) All titles whose price is greater than the average price (alternative)");
IList <JsonElement> results3 = JsonSelector.Select(doc.RootElement, @"$.books[?(@.price > sum($.books[*].price)/length($.books[*].price))].title");
Console.WriteLine(JsonSerializer.Serialize(results3, serializerOptions));
Console.WriteLine();
Console.WriteLine("(4) All books that don't have a price");
IList <JsonElement> results4 = JsonSelector.Select(doc.RootElement, @"$.books[?(!contains(keys(@),'price'))]");
Console.WriteLine(JsonSerializer.Serialize(results4, serializerOptions));
Console.WriteLine();
Console.WriteLine("(5) All books that have a price that rounds up to 23.6");
IList <JsonElement> results5 = JsonSelector.Select(doc.RootElement, @"$.books[?(ceil(@.price*10) == 236)]");
Console.WriteLine(JsonSerializer.Serialize(results5, serializerOptions));
Console.WriteLine();
Console.WriteLine("(6) All books that have a price that rounds down to 22.7");
IList <JsonElement> results6 = JsonSelector.Select(doc.RootElement, @"$.books[?(floor(@.price*10) == 227)]");
Console.WriteLine(JsonSerializer.Serialize(results6, serializerOptions));
Console.WriteLine();
}