How to extract numbers from string array/dictionary using c#? - c#

I have a string where its a string of a array of dictionaries.
An example of the format is:
[{"id":1,"items":[5,8]},{"id":2,"items":[6]},{"id":3,"items":[7]}]
(Note: all the above code is a string)
So here it is a string of an array of dictionaries that has two keys, the value of the first key is a number, and the value of the second key is a array of numbers.
Using c# (out of the box assemblies), how can I iterate through all the id values, and then all the item array values.
So I would expect like a double for loop. One to iterate through the id's and extract the number, and then for each iteration it would need to iterate through all the values of the items array.
Does anyone know how to go about parsing and extracting the numbers?
Thanks.
The output would be like ( for example )
1
5 8
2
6
3
7
EDIT:
I tried this:
string dataString = JSONValue.Text;
JavaScriptSerializer jss = new JavaScriptSerializer();
var json = new JavaScriptSerializer();
var data = json.Deserialize<List<Dictionary<string, Object>>>(dataString);
int sectionID;
List<int> itemIDS;
foreach (Dictionary<string, Object> dict in data)
{
sectionID = (int)dict["id"];
itemIDS = (List<int>)dict["items"];
ReportObject.log(sectionID.ToString());
foreach (int itemID in itemIDS)
{
ReportObject.log(itemID.ToString());
}
}
But am getting
(6/27/2013 12:02:04 AM) - Error Message: Unable to cast object of type 'System.Collections.ArrayList' to type 'System.Collections.Generic.List`1[System.Int32]'.


try this
using using System.Web.Script.Serialization;
var jsonStr = "[{\"id\":1,\"items\":[5,8]},{\"id\":2,\"items\":[6]},{\"id\":3,\"items\":[7]}]";
var json = new JavaScriptSerializer();
var data = json.Deserialize<List<dynamic>>(jsonStr);
this will generate a list of dynamic object with two properties id and items, then you can loop through that list and retrieve the info which you want.
The dynamic keyword only available from .net 4.0 or later. Otherwise you can use the following option.
create a class like this
public class Info{
public int Id { get; set; }
public int[] Items { get; set; }
}
and then var data = json.Deserialize<List<Info>>(jsonStr);


try getting the int value of string, if it's an array, get the object on the index specifically and try to the ToInt() or cast the string object to int. it can be done both ways.

Related

How to find particular json element from txt file in c# using xpath/jsonpath?

I have a lot of JSON format data into text file and format is like:
[{"ev":"AM","sym":"TMHC","v":1000,"av":74917,"op":18.92,"vw":19.1305,"o":19.13,"c":19.15,"h":19.15,"l":19.13,"a":19.143,"z":90,"n":1,"s":1549380300000,"e":1549380360000},{"ev":"AM","sym":"SPYG","v":7103,"av":184266,"op":35.27,"vw":35.3148,"o":35.3264,"c":35.34,"h":35.34,"l":35.3258,"a":35.3345,"z":710,"n":1,"s":1549380300000,"e":1549380360000},
{"ev":"AM","sym":"AAPL","v":73,"av":1866,"op":35.27,"vw":35.3148,"o":35.3264,"c":35.34,"h":35.34,"l":35.3258,"a":35.3345,"z":710,"n":1,"s":1549380300000,"e":1549380360000}]
So I need to find json element of particular symbol. Like if I use AAPL then it gives us all AAPL element data from txt file. Like
{"ev":"AM","sym":"AAPL","v":73,"av":1866,"op":35.27,"vw":35.3148,"o":35.3264,"c":35.34,"h":35.34,"l":35.3258,"a":35.3345,"z":710,"n":1,"s":1549380300000,"e":1549380360000}
So please can you help me to how should I make it ?
static void xPathUsing()
{
const string filePath = #"D:\Aggregate_Minute_AAPL.txt";
using (StreamReader r = new StreamReader(filePath))
{
string json = r.ReadToEnd();
}
}

As you need to run multiple operations on the data, the best way would be to read the data into memory once (or again whenever the data changes) and hold them in a way that supports fast querying. In order to find a row by the symbol, you could create a dictionary that holds the data.
The following samples use the widely used JSON.NET library for parsing the JSON.
First, you need to define a class that ressembles the schema of your JSON objects, e.g.:
class Row
{
[JsonProperty("sym")]
public string Symbol { get; set; }
public decimal vw { get; set; }
// ...
}
Please note that you can use the JsonProperty attribute in order to be able to assign different names to the properties of the class than in the JSON.
The following sample shows how to read the data from a file and how to convert it to a dictionary:
var input = File.ReadAllText("C:\\Temp\\abc.json");
var rows = JsonConvert.DeserializeObject<IEnumerable<Row>>(input);
var dict = rows.ToDictionary(x => x.Symbol, x => x, StringComparer.OrdinalIgnoreCase);
After preparing your dictionary once, you can get the corresponding row by using the indexer:
var aaplRow = dict["AAPL"];

Json newtonsoft : Deserialize string array from an Object

My JSON is a very long one and i am fetching only one section "parent_crumbs" from the long JSON
...................,
"parent_crumbs":["Platforms","New platform"],
"promise_by":"2016-08-01",
....
The code I used to fetch value of "parent_crumbs" is
JObject lp_p = JObject.Parse(response_json);
string val= lp_p["parent_crumbs"].ToString();
This returns the following value
"[\r\n \"Platforms\",\"New platform\"\r\n]"
Now I have to do a comparison with the first value from the array as the string is available in a Dictionary as key value and if available return ID
Packages = new Dictionary<string, int>();
Packages.Add("Platforms", 10212);
Packages.Add("New platform", 10202);
Packages.Add("Unknown platform", 10203);
int category=
if(Packages.ContainsKey(val))
{
Packages.TryGetValue(val, out category);
}
So with current code I can't do the comparison straight away due to presence of [\r\n etc.
How to get the value as a string Array without special chars like [\r\n .
Making Model Classes for the JSON for deserialization is not preferred way for me. Since creating class is a big job for me as lot of properties are there in JSON and is dynamic of nature

We can use the below code
var input = "[\r\n \"Platforms\",\"New platform\"\r\n]";
var array =(JArray) JsonConvert.DeserializeObject(input);
bool isEqual = array[0].Value<string>() == "Platforms";

you could also convert it to array with Linq
using System.Linq;
var tmp = lp_p["parent_crumbs"].Select(x => x.ToString());
foreach (var x in tmp)
{
Console.WriteLine(x.ToString());
}
By using Select, it will help you convert it to array rather than to string

You can use DeserializeAnonymousType method for that:
var myType = new
{
parent_crumbs = new []{ "" },
promise_by = default(DateTime)
};
var result = JsonConvert.DeserializeAnonymousType(json, myType);
int category = 0;
string key = result.parent_crumbs[0];
if(Packages.ContainsKey(key))
{
Packages.TryGetValue(key, out category);
}
References: DotNetFiddle Example, DeserializeAnonymousType

Unable to perform for loop on json response object

I have dictionary of categories & their types in .cs file such as
Dictionary<string, List<string>> jsonDic
I have converted it into the json object string using following logic:
JavaScriptSerializer jss = new JavaScriptSerializer();
string barJson = jss.Serialize(jsonDic);
string js = "TypesArray(" + barJson + ")";
ScriptManager.RegisterStartupScript(this, this.GetType(), "Startup1", js, true);
Now, in .js file I am getting following response
As we can see result is not in the form of array I am not able to index tpoints since it is not an array. What should I do? I want to index categories also types assosiated with each category..

You can access any of the attributes by name
tpoints["Foods"]
and that returns you an array of strings, in the foods case
[Restaurant, Cafe, Bakery]
If you want to iterate,
for (var property in tpoints ) {
if (tpoints.hasOwnProperty(property)) {
// do stuff
}
}

I think you are getting very confused with the kind of data structure you're working with. First, you're question title is false...
Unable to perform for loop on json response object
because you are indeed looping through the json objects. When you serialize the object below...
Dictionary<string, List<string>> jsonDic;
the serializer is actually mapping each KeyValuePair object inside the dictionary to a json array item, that is tPoint. So, to iterate through this array all you have to do is the following...
for (var tpoint in tpoints ) {
tpoint.Foods; //get food array
tpoint.Foods[0]; //get the first food item
}
and so on, you could even add a nested for loop to iterate through each inner array as below...
for (var tpoint in tpoints ) {
for(var i = 0; i < tpoint.Foods.length;i++){
console.log(tpoint.Foods[i]);
}
}
this will iterate through all food items in every tpoints

How to get value from dictionary without knowing key?

I want to get value from dictionary but i don't know key(Because dynamic generate dictionary from database) how can i get dictionary value.
If you some idea share me ...
For Example my database string value like
string jsonString = " "FB": "[{\"title\":\"sheet1\",\"rows\":[{\"height\":\"undefined\",\"columns\":[{\"value\":\"Cover Group \"},{\"value\":\"Sample Variable\"},{\"value\":\"Coverpoint Name\"},{\"value\":\"Crossed cover points\"},{\"value\":\"Coverpoint Comment\"},{\"value\":\"Bin Type\"},{\"value\":\"Bin Id\"},{\"value\":\"Sample Value\"},{\"value\":\"Expected Bin Count\"},{\"value\":\"Set Max Bin\"},{\"value\":\"Not Used\"}]},{\"height\":\"undefined\",\"columns\":[{\"value\":\"allCg,allSi\"},{\"value\":\"exSingle\"},{\"value\":\"exSingle\"},{},{\"value\":\"Example for single bin\"},{\"value\":\"single\"},{\"value\":\"valZero\"},{\"value\":\"1'b0\"},{\"formula\":\"1\",\"value\":1},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{\"value\":\"single\"},{\"value\":\"valOne\"},{\"value\":\"1'b1\"},{\"formula\":\"1\",\"value\":1},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{\"value\":\"ex1Bus[3:0]\"},{\"value\":\"exMulti\"},{},{\"value\":\"Example for multibin\"},{\"value\":\"multi\"},{},{\"value\":\"[0:15]\"},{\"formula\":\"16\",\"value\":16},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{\"value\":\"exCross\"},{\"value\":\"exSingle,exMulti\"},{\"value\":\"Example for cross\"},{\"value\":\"Implicit\"},{},{},{\"formula\":\"32\",\"value\":32},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{\"value\":\"ex2Bus[15:0]\"},{\"value\":\"exWildcard\"},{},{\"value\":\"example for wildcard\"},{\"value\":\"wildcard\"},{\"value\":\"ex_wildcard\"},{\"value\":\"16'bxxxxxxxxxxxxxx1\"},{\"formula\":\"1\",\"value\":1},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{\"value\":\"ex3Bus[4:0]\"},{\"value\":\"exImplicit\"},{},{\"value\":\"example for implicit & set max bin\"},{\"value\":\"Implicit\"},{},{},{\"formula\":\"8\",\"value\":8},{\"formula\":\"8\",\"value\":8},{}]},{\"height\":\"undefined\",\"columns\":[{},{\"value\":\"ex4Bus[3:0]\"},{\"value\":\"ex4Bus\"},{},{\"value\":\"setup for ignore example\"},{\"value\":\"multi\"},{},{\"value\":\"[0:15]\"},{\"formula\":\"16\",\"value\":16},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{\"value\":\"exIgnore\"},{\"value\":\"exSingle,ex4Bus\"},{\"value\":\"example for ignore\"},{\"value\":\"ignore\"},{},{\"value\":\"ex4Bus([12:15])\"},{\"formula\":\"24\",\"value\":24},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{\"value\":\"ex5Bus[3:0]\"},{\"value\":\"exIllegal\"},{},{\"value\":\"example for illegal\"},{\"value\":\"illegal\"},{},{\"value\":\"[12:15]\"},{\"formula\":\"16\",\"value\":16},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{},{},{},{},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{},{},{},{},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{},{},{},{},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{},{},{},{},{},{}]},{\"height\":\"undefined\",\"columns\":[{},{},{},{},{},{},{},{},{},{},{}]}],\"metadata\":{\"widths\":[\"200\",\"200\",\"200\",\"200\",\"200\",\"200\",\"200\",\"200\",\"200\",\"200\",\"200\"],\"frozenAt\":{\"row\":0,\"col\":0}}}]""
FB is dynamic key and after it's value title all value i need

If you don't have the key, but have the value and trying to get hold of the key, you can do this:
Dictionary<string, string> testData = new Dictionary<string, string>();
testData.Add("name", "Latheesan");
testData.Add("age", "26");
KeyValuePair<string, string> searchResult
= testData.FirstOrDefault(s => s.Value == "Latheesan");
string key = searchResult.Key; // returns "name" here

To get a sequence of all the Key/Value pairs where the value matches a target:
var dict = new Dictionary<string, int>
{
{"One", 1},
{"Two", 2},
{"Another One", 1},
{"Three", 3},
{"Yet Another One", 1}
};
int target = 1; // For example.
var matches = dict.Where(item => item.Value == target);
foreach (var kvp in matches)
Console.WriteLine("Key = " + kvp.Key);

The sample data you posted isn't a flat key-value dictionary. It contains embedded dictionaries - the base dictionary contains a title and a rows, which in turn consists of height and columns and so on, and at some point are key-value pairs who keys are, confusingly, named 'value'. Are you asking how to parse this data structure to get all the values whose key is value?
What you first need to do, since this appears to be a JSON-formatted entry, is parse the JSON into a .NET data structure, using libraries like JSON.NET or System.Web.Helpers.Json. These libraries will convert the JSON string into a hierarchy of dictionaries, all of them implementing IEnumerable, so you can iterate over it, more or less like this (this is not compilable code, just a demonstration!):
public void Main()
{
var jsonObject = Json.Decode(FB); // FB is your JSON string.
var values = new List<string>();
FindValues(jsonObject);
}
public void FindValues(jsonObject, values)
{
foreach (var child in jsonObject)
{
if (child.key == 'value')
{
values.Add(child.value);
}
// Recursively call FindValues on child objects.
FindValues(child, values);
}
}
This C#-ish pseudo-code shows you how to go over a dictionary, then optionally drill down deeper into internal dictionaries.

This code use for get value from dictionary value without knowing key and value..
var json = Newtonsoft.Json.JsonConvert.SerializeObject(jsonString );
var javSer = new JavaScriptSerializer();
var dfi = javSer.Deserialize<Dictionary<string, string>>(json);
string dataString= dfi.Values.First();

How can you possibly know which value you need if you don't have the key?
A Dictionary in .NET does contain a Keys and Values collection, so if you are only interested in the values, you can use that.

Serialize into a key-value dictionary with Json.Net?

Hello I'm trying to serialize an object into a hash, but I'm not getting quite what I want.
Code:
class Data{
public string Name;
public string Value;
}
//...
var l=new List<Data>();
l.Add(new Data(){Name="foo",Value="bar"});
l.Add(new Data(){Name="biz",Value="baz"});
string json=JsonConvert.SerializeObject(l);
when I do this the json result value is
[{"Name":"foo","Value":"bar"},{"Name":"biz","Value":"baz"}]
The result I want however is this:
[{"foo":"bar"},{"biz":"baz"}]
How do I made the JSON come out like that?

Try this for the last line of your method:
string json = JsonConvert.SerializeObject(l.ToDictionary(x=>x.Name, y=>y.Value));
Result: {"foo":"bar", "biz":"baz"}
For result: [{"foo":"bar"},{"biz":"baz"}] you can do this...
string json = JsonConvert.SerializeObject(new object[]{new {foo="bar"}, new {biz = "baz"} });
OR
string json = JsonConvert.SerializeObject(new object[]{new Data1{foo="bar"}, new Data2{biz = "baz"} });
The first result assumes same data type, so results are part of same array. The second is different data types, so you get a different array

you can create your own key value list
like
class mylist:Dictionary<string,object>
{
}
var l=new mylist<Data>();
l.Add("foo","bar");
it should solve your problem

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