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Filtering Nested array with linq

I have an array like this coming from API response and I want to filter by nested property products to returns product with only id 11
"assets": [
{
"name": "abc",
"products": [
{
"id": "11",
"status": true
},
{
"id": "14",
"status": null
}
]
},
{
"name": "xyz",
"products": [
{
"id": "11",
"status": true
},
{
"id": "28",
"status": null
}
]
},
{
"name": "123",
"products": [
{
"id": "48",
"status": null
}
]
},
{
"name": "456",
"products": [
{
"id": "11",
"status": true
}
]
}
]
the resulting output should look like this,
"assets": [
{
"name": "abc",
"products": [
{
"id": "11",
"status": true
}
]
},
{
"name": "xyz",
"products": [
{
"id": "11",
"status": true
}
]
},
{
"name": "123",
"products": []
},
{
"name": "456",
"products": [
{
"id": "11",
"status": true
}
]
}
]
I'm trying to return filter output with the C# LINQ method. but, getting an error when filtering a nested array with the following method
"Cannot convert lambda expression to intended delegate type because some of the return types in the block are not implicitly convertible to the delegate return type"
assets.Select(asset => asset.products.Where(product => product.id == "11")).ToArray();

You can just remove all items from every products array, whose id doesn't equal 11. Parse JSON to JObject, iterate over assets array, find products with id different from 11 and remove them form original array
var json = JObject.Parse(jsonString);
foreach (var asset in json["assets"])
{
var productsArray = asset["products"] as JArray;
if (productsArray == null)
continue;
var productsToRemove = productsArray
.Where(o => o?["id"]?.Value<int>() != 11)
.ToList();
foreach (var product in productsToRemove)
productsArray.Remove(product);
}
Console.WriteLine(json);

Instead of Select and Applying a, Where try to remove the Products that you do not want.
Following is a sample code.
class Program
{
static void Main(string[] args)
{
var json = #"
{
'assets': [
{
'name': 'abc',
'products': [
{
'id': '11',
'status': true
},
{
'id': '14',
'status': null
}
]
},
{
'name': 'xyz',
'products': [
{
'id': '11',
'status': true
},
{
'id': '28',
'status': null
}
]
},
{
'name': '123',
'products': [
{
'id': '48',
'status': null
}
]
},
{
'name': '456',
'products': [
{
'id': '11',
'status': true
}
]
}
]}";
var root = JsonConvert.DeserializeObject<Root>(json);
var assets = root.Assets;
assets.ForEach(a =>
{
a.Products.RemoveAll(p => p.Id != 11);
});
}
}
public partial class Root
{
[JsonProperty("assets")]
public List<Asset> Assets { get; set; }
}
public partial class Asset
{
[JsonProperty("name")]
public string Name { get; set; }
[JsonProperty("products")]
public List<Product> Products { get; set; }
}
public partial class Product
{
[JsonProperty("id")]
public long Id { get; set; }
[JsonProperty("status")]
public bool? Status { get; set; }
}

To filter the list, you will need to create a new list with products whose ID == YourId. Following linq query does the necessary steps to create the list you want.
Filter out any assets that dont have any product with ID == 11. This is necessary to skip nulls in the new list that will be generated (Where statement)
Create a collection / list of new assets that only have the products whose ID == 11 (Select statement)
var list = assets.Where(x => x.Products.Where(y => y.Id.Equals("11")).Count() > 0)
.Select(asset => {
return new Asset() {
Name = asset.Name,
Products = asset.Products.Where(x => x.Id == "11").ToList()
};
}).ToList();
// Create the RootObject that holds a list of all the arrays if you want.
Rootobject newAssetCollection = new Rootobject() { Assets = list };
Below is the Json that was printed
Console.WriteLine(JsonConvert.SerializeObject(newAssetCollection, Formatting.Indented));
{
"assets": [
{
"name": "abc",
"products": [
{
"id": "11",
"status": true
}
]
},
{
"name": "xyz",
"products": [
{
"id": "11",
"status": true
}
]
},
{
"name": "456",
"products": [
{
"id": "11",
"status": true
}
]
}
]
}

Get nested fieldNames from JSON object

I have a JSON that contains a list of types. These types have some name and some fields.
Fields have a property of dataType and if it's value is object, it refers to a another type. That type could be found by its name specified in referenceType property.
There is also a property named parentType which means the type is a child of the parentType and it contains some additional properties, but have to be considered as an object of parentType only.
I am trying to process this JSON to get all the nested property names for all the types present in the array.
{
"types": [
{
"name": "User1",
"fields": [
{
"name": "name",
"dataType": "string"
},
{
"name": "address",
"dataType": "object",
"referenceType": "Address",
"isArray": true
},
{
"name": "weeklyRoles",
"dataType": "object",
"isArray": true,
"referenceType": "Role"
}
]
},
{
"name": "User2",
"fields": [
{
"name": "name",
"dataType": "string"
},
{
"name": "address",
"dataType": "object",
"referenceType": "Address",
"isArray": true
}
]
},
{
"name": "Address",
"fields": [
{
"name": "AddressLine1",
"dataType": "string"
},
{
"name": "AddressLine2",
"dataType": "string"
}
]
},
{
"name": "BusinessAddress",
"parentType": "Address",
"fields": [
{
"name": "headquarters",
"dataType": "string"
}
]
},
{
"name": "ServiceAddress",
"parentType": "Address",
"fields": [
{
"name": "servicePartner",
"dataType": "string"
},
{
"name": "serviceType",
"dataType": "string"
}
]
},
{
"name": "Role",
"fields": [
{
"name": "roleName",
"dataType": "string"
},
{
"name": "accessCountsObj1",
"dataType": "object",
"referenceType": "Role2"
}
]
},
{
"name": "Role2",
"fields": [
{
"name": "roleName2",
"dataType": "string"
},
{
"name": "accessCountsObj2",
"dataType": "object",
"referenceType": "Role3"
}
]
},
{
"name": "Role3",
"fields": [
{
"name": "roleName3",
"dataType": "string"
},
{
"name": "accessCountsObj3",
"dataType": "object",
"referenceType": "Role4"
}
]
},
{
"name": "Role4",
"fields": [
{
"name": "roleName4",
"dataType": "string"
}
]
}
]
}
Pattern in which I am expecting the result is <typeName>;<fieldName>.<nestedFieldName>
Expected Output
[
"User1;address.AddressLine1",
"User1;address.AddressLine2",
"User1;address.headquarters",
"User1;address.servicePartner",
"User1;address.serviceType",
"User1;weeklyRoles.roleName",
"User1;weeklyRoles.accessCountsObj1.roleName2",
"User1;weeklyRoles.accessCountsObj1.accessCountsObj2.roleName3",
"User1;weeklyRoles.accessCountsObj1.accessCountsObj2.accessCountsObj3.roleName4",
"User2;address.AddressLine1",
"User2;address.AddressLine2",
"User2;address.headquarters",
"User2;address.servicePartner",
"User2;address.serviceType",
"Role;accessCountsObj1.roleName2",
"Role;accessCountsObj1.accessCountsObj2.roleName3",
"Role;accessCountsObj1.accessCountsObj2.accessCountsObj3.roleName4",
"Role2;accessCountsObj2.roleName3",
"Role2;accessCountsObj2.accessCountsObj3.roleName4",
]
I have tried to write a recursive function to process it but it is not giving me the expected result and also does not have terminating condition.
public IList<string> GetKeys(JArray types, string parentType = null)
{
var nestedKeys = new List<string>();
foreach (var type in types)
{
var fields = type[Constants.Fields].ToObject<List<JObject>>();
var typeName = type.Value<string>("name");
var nestedKeyBuilder = new StringBuilder($"{typeName};");
if (!string.IsNullOrEmpty(parentType))
{
nestedKeyBuilder = new StringBuilder($"{parentType};");
}
foreach (var field in fields)
{
var datatype = field.Value<string>("dataType");
if (string.Equals(datatype,"object"))
{
var fieldName = field.Value<string>("name");
var referenceTypeName = field.Value<string>("referenceType");
var referenceTypeObject = types.Where(t => string.Equals(t.Value<string>("name"), referenceTypeName))?.First();
if (referenceTypeObject != null)
{
var refTypeFields = referenceTypeObject["fields"].ToObject<List<JObject>>();
foreach (var refTypeField in refTypeFields)
{
var refTypeFieldName = refTypeField.Value<string>("name");
var refTypeDataType = refTypeField.Value<string>("dataType");
var refTypeReferenceTypeName = refTypeField.Value<string>("referenceType");
if (string.Equals(refTypeDataType, "object") && string.Equals(refTypeReferenceTypeName, currentReferenceType))
{
var refTypeNestedKeys = GetKeys(types, typeName);
nestedKeys.AddRange(refTypeNestedKeys);
}
else
{
nestedKeyBuilder.Append($"{fieldName}.{refTypeFieldName}");
nestedKeys.Add(nestedKeyBuilder.ToString());
}
}
}
}
}
}
return nestedKeys;
}

There is a NuGet that you can use to handle JSON files.
Search for Newtonsoft.Json
https://www.newtonsoft.com/json
All your problems should be solved with that

You can use Newtonsoft library to do this.
This is your POCO class.
{
public string name { get; set; }
public string dataType { get; set; }
public string referenceType { get; set; }
public bool? isArray { get; set; }
}
public class Type
{
public string name { get; set; }
public List<Field> fields { get; set; }
public string parentType { get; set; }
}
public class RootObject
{
public List<Type> types { get; set; }
}
and write the function to DeserializeObject
[TestMethod]
public void Read()
{
var sample1 = #"X:\JsonFilePath\data.json";
var jsonString=File.ReadAllText(sample1);
var result =JsonConvert.DeserializeObject<RootObject>(jsonString);
Assert.IsNotNull(result);
}

Use newtonsoft JSON to Deseriliaze the JSON string.
JSON.Deserialize<IEnumerable<Type>>(jsonString);
This should give you an IEnumerable to process it however you want. Types is the class you create with the JSON properties as class properties. You can use something like this
NOTE: Type and Field are very vague names. Type is a c# class and therefore you should not use it to create a class of your own. You will face ambiguous errors and you will need to qualify the namespace in full to use your class. Strongly suggesting to name it something else and use the attributes to map it to the JSON string.
[JsonObject(Title="People")]
public class Type
{
[JsonProperty("name")]
string Name{ get; set; }
[JsonProperty("fields")]
Field FieldValue[]{ get; set; }
}

How do I sort a list based on its child object attributes?

I'm wondering if someone can elucidate a method to sort a list of objects based on a child object's attribute.
I'm working with the following model:
public class Content
{
public string Id { get; set; }
public List<ContentAttribute> Attributes { get; set; }
}
public class ContentAttribute
{
public string Value { get; set; }
public string Id { get; set; }
public string Name { get; set; }
}
Some sample data:
[
{
"Id": "123",
"Attributes": [
{
"Value": "abc",
"Id": "1a",
"Name": "name1"
},
{
"Value": "ghi",
"Id": "2b",
"Name": "name2"
}
]
},
{
"Id": "456",
"Attributes": [
{
"Value": "abc",
"Id": "1a",
"Name": "name2"
},
{
"Value": "def",
"Id": "2b",
"Name": "name3"
}
]
},
{
"Id": "789",
"Attributes": [
{
"Value": "abc",
"Id": "1a",
"Name": "name1"
},
{
"Value": "def",
"Id": "2b",
"Name": "name2"
}
]
}
]
How can I sort the Content objects by the Value of a specific attribute Name? For example, I would like to sort the above data by the Value of 'name2',
meaning the result would be
[
{"Id" : "456"},
{"Id" : "789"},
{"Id" : "123"}
]
Any help is greatly appreciated. (Using c#).

If Attributes always has an element with name name2 and you want an exception if it doesn't then:
var sorted = contents.OrderBy(c => c.Attributes.First(a => a.Name == "name2").Value).ToList();
Or if name2 could be missing and it's not deal breaker then use FirstOrDefault
var sorted = contents.OrderBy(c => c.Attributes.FirstOrDefault(a => a.Name == "name2")?.Value).ToList();

Using C# Nest API to get nested json data is not retrieving data

I have the following json coming through the elasticsearch:
{
"_index": "data-2016-01-14",
"_type": "type-data",
"_id": "AVJBBNG-TE8FYIA1rf1p",
"_score": 1,
"_source": {
"#message": {
"timestamp": 1452789770326461200,
"eventID": 1452789770326461200,
"eventName": "New",
"Price": "38.34",
"Qty": 100,
"statistic_LatencyValue_ns": 1142470,
"statistic_LatencyViolation": false,
"statistic_LossViolation": false
},
"#timestamp": "2016-01-14T16:42:50.326Z",
"#fields": {
"timestamp": "1452789770326"
}
},
"fields": {
"#timestamp": [
1452789770326
]
}
}
I'm using Nest to try to get the eventName data i created the class and marked the property:
public class ElasticTest
{
[ElasticProperty(Type = FieldType.Nested)]
public string eventName { get; set; }
}
But the following query is returning 0 results, what am i doing wrong?
var result = client.Search<CorvilTest>(s => s
.From(0)
.Size(10000)
.Query(x => x
.Term(e => e.eventName,"New"))
);
var r = result.Documents;
Mapping definition:
{
"data-2016-01-14": {
"mappings": {
"type-data": {
"properties": {
"#fields": {
"properties": {
"timestamp": {
"type": "string"
}
}
},
"#message": {
"properties": {
"OrderQty": {
"type": "long"
},
"Price": {
"type": "string"
},
"eventID": {
"type": "long"
},
"eventName": {
"type": "string"
},
"statistic_LatencyValue_ns": {
"type": "long"
},
"statistic_LatencyViolation": {
"type": "boolean"
},
"statistic_LossViolation": {
"type": "boolean"
},
"timestamp": {
"type": "long"
}
}
},
"#timestamp": {
"type": "date",
"format": "dateOptionalTime"
}
}
}
}
}
}

I see that the field #message.eventName is using a standard analyzer which means that its value is lower-cased and split at word boundaries before indexing. Hence the value "new" is indexed and not "New". Read more about it here. You need to be mindful about this fact when using a Term Query. Another thing is that the field eventName is not of nested type. So the code below should work for you.
var result = client.Search<CorvilTest>(s => s
.From(0)
.Size(10000)
.Query(x => x
.Term(e => e.Message.EventName, "new"))); // Notice I've used "new" and not "New"
var r = result.Documents;
For the above code to work the definition of CorvilTest class should be something like below:
public class CorvilTest
{
[ElasticProperty(Name = "#message")]
public Message Message { get; set; }
/* Other properties if any */
}
public class Message
{
[ElasticProperty(Name = "eventName")]
public string EventName { get; set; }
}

Generate c# classes from json dynamically

I usually use json2csharp to generate json classes to c#. But I do have problem. My json is have dynamic depth like this
{
"kategori": [
{
"id": "1",
"namakategori": "Tips & Trick",
"parent_id": "0",
"children": [
{
"id": "348",
"namakategori": "Fotografi",
"parent_id": "1",
"children": []
},
{
"id": "370",
"namakategori": "Hacking",
"parent_id": "1",
"children": []
}
]
},
{
"id": "12",
"namakategori": "Aplikasi",
"parent_id": "0",
"children": [
{
"id": "13",
"namakategori": "Tools",
"parent_id": "12",
"children": [
{
"id": "14",
"namakategori": "Toolsorder",
"parent_id": "13",
"children":[]
},
]
},
]
},
]
}
So how do I generate json classes dynamically so it can be used for my json? In above example I have 3 depth. But if I go to different page maybe it have 4 or more depth.

You don't need to declere your classes dynamically. This should work:
public class Child
{
public string id { get; set; }
public string namakategori { get; set; }
public string parent_id { get; set; }
public List<Child> children { get; set; } // <-- See this
}
public class RootObj
{
public List<Child> kategori { set; get; }
}
To deserialize I'll use Json.Net
var res = JsonConvert.DeserializeObject<RootObj>(json);

You can always use the Newtonsoft.Json
For Instance,
JObject result = (JObject) JsonConvert.DeserializeObject(yourJsonDataHere);
var katObject = result.Property("kategori").Value;
and so on...
PS: Not sure if Newtonsoft.Json is supported on WP7.