How to handle json object in codebehind

How to handle json object in codebehind - c#

I have - var JsonObj = []; and I pushed some data into that and send it to codebehind using JQuery.ajax() method. I am able to receive in a method which has parameter like this
[WebMethod]
public static void SaveInfo(List<Object> userEnteredDetails)
{
}
And i loop thru the collection to get the data something like this,
foreach (object item in userEnteredDetails)
{
Dictionary<string, object> details = item as Dictionary<string, object>;
string name = details["customerName"] as string;
}
The problem here is, I am receiving more than 10 items in the collecton. So i cannot read another property in my above for loop. Something like this,
foreach (object item in userEnteredDetails)
{
Dictionary<string, object> details = item as Dictionary<string, object>;
string name = details["customerName"] as string;
string city= details["city"] as string;
}
Firsttime city wil throw an error, and next time customername. Because item variable will have one variable at a time. How to read all the more than 10 records efficiently since we dont have property, but can read only through an indexer (details["customerName"]).

Try this:
string name = String.Empty;
string city = String.Empty;
foreach (object item in userEnteredDetails)
{
Dictionary<string, object> details = item as Dictionary<string, object>;
if (details.ContainsKey("customerName"))
name = details["customerName"] as string;
if (details.ContainsKey("city"))
city= details["city"] as string;
}

You can enumerate the details Dictionary.
foreach(var kvp in details)
{
// do something with kvp.Key and kvp.Value
}
EDIT:
To get a one merged details dictionairy first, you can try this:
var details = list.Select(item => item as Dictionary<string, object>).SelectMany(d => d).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

One thing you could have a type with fields in them mapping to the list of objects. While making the ajax call stringify the json object. In your web method recieve it as string. Use Json Deserializer and deserialize it to the type you have created.

Theres a very flexible json framework (JSON.NET) which could help with this, definitley worth considering if your doing a lot of work with JSON http://json.codeplex.com/

Related

Can't store multiple items in IDictionary [duplicate]

This question already has an answer here:
How to store multiple items in IDictionary?
(1 answer)
Closed 6 years ago.
I have created this IDictionary:
IDictionary<string, string> trace = new Dictionary<string, string>();
my goal is use it for save the content of json deserialized. I save the content in the IDictionary like this:
var obj = JsonConvert.DeserializeObject<List<RootObject>>(responseText);
foreach (var item in obj)
{
trace["date"] = item.trace.details.date;
trace["type"] = item.trace.details.type;
}
now in the obj variable I have 180 elements, the foreach over all items available in obj. The problem is that in the trace dictionary for each iteration each item is replaced, so I get only the item of the last iteration. How can I save all items in the dictionary? A dictionary shouldn't push each item automatically in the next iteration, instead of replacing it?

As #Santosh pointed out, this is expected behavior. You could instead use a List<Dictionary<String,String>>
var traces = new List<Dictionary<string, string>>();
var obj = JsonConvert.DeserializeObject<List<RootObject>>(responseText);
foreach (var item in obj)
{
var trace = new Dictionary<String,String>();
trace["date"] = item.trace.details.date;
trace["type"] = item.trace.details.type;
...
traces.Add(trace);
}

Try:
IDictionary<string, string> trace = new Dictionary<string, IList<string>>();
trace.Add("date", new List<string>())
trace.Add("type", new List<string>())
var obj = JsonConvert.DeserializeObject<List<RootObject>>(responseText);
foreach (var item in obj)
{
trace["date"].Add(item.trace.details.date)
trace["type"].Add(item.trace.details.type)
}
Plz, feel free to improve this design.

This is not how dictionaries work in C#. As the name suggests it should be one key with one value. You don't have repeated entries in dictionaries, right?
What you're probably trying to do is add to values in each entry, so I'll suggest using Tuple, since I don't know the type of your json parsed data, I'll assume string for everything, but type really won't change anything here :
var list = new List<Tuple<string,string>>();
foreach (var item in obj)
{
list.Add(new Tuple<string, string>(item.trace.details.date, item.trace.details.type));
}
Now you'll reach each entry as list[i].Item1 for a date on a given i index and list[i].Item2 for a type on the same index.

Using LINQ, you can do this:
var obj = JsonConvert.DeserializeObject<List<RootObject>>(responseText);
var traces = obj.Select(item => new Dictionary<string, string> {
{ "date", item.trace.details.date },
{ "type", item.trace.details.type }
});
You will get an IEnumerable<Dictionary<string, string>>. There isn't really a simpler way to do what you ask other than to use a collection of dictionaries.

Perhaps you can use a Lookup<string, string>, this is a one-to-many dictionary. You can create one using ToLookup() extension method:
var dates = obj.Select(o => new { Key = "date", Value = o.trace.details.date });
var types = obj.Select(o => new { Key = "type", Value = o.trace.details.type });
var lookUp = dates.Concat(types).ToLookup(kv => kv.Key, kv => kv.Value);

Alternate of if and foreach for Linq

Could there be a sophisticated LINQ for the following code.
My code is trying to prepare a dictionary of string(key), string(value), by first getting a list of objects from another dictionary and then looping over to that list of objects.
Dictionary<string, string> displayNames = new Dictionary<string, string>();
List<DefDefaultDataSet.dbEnumsRow> enumList;
//allEnums dictionary: Key as string and value as List<DefDefaultDataSet.dbEnumsRow>
//enumID is a string object
if (allEnums.TryGetValue(enumID, out enumList))
{
foreach (DefDefaultDataSet.dbEnumsRow row in enumList)
{
string enumValue = row.Value;
//If already have enumvalue ,no need to add again
if (!string.IsNullOrWhiteSpace(enumValue) && !displayNames.ContainsKey(enumValue))
{
displayNames.Add(enumValue, FindResourceVal(row.ResourceKey, uniqueKey));
}
}
}

You can keep the if statement, then filters using Where and create the dictionary using ToDictinary:
if (allEnums.TryGetValue(enumID, out enumList))
displayNames = enumList.Where(e => !string.IsNullOrWhiteSpace(e.Value) && !displayNames.ContainsKey(e.Value))
.ToDictionary(k => k.ResourceKey, v => FindResourceVal(v.ResourceKey, uniqueKey));

How to convert the following JSON array into IDictionary<string, object>?

Following is the serialized JSON array I want to convert to IDictionary
[
{
"8475": 25532
},
{
"243": 521
},
{
"3778": 15891
},
{
"3733": 15713
}
]
When I tried to use
JsonConvert.DeserializeObject<IDictionary<string, object>>((string)jarray);
I got an error saying:
Cannot cast 'jarray' (which has an actual type of 'Newtonsoft.Json.Linq.JArray') to 'string'
The JSON deserializer requires only a string.

If you already have the JArray, all you have to do is convert it to a dictionary I guess.
Roughly something like this:
IDictionary<string,object> dict = jarray.ToDictionary(k=>((JObject)k).Properties().First().Name, v=> v.Values().First().Value<object>());
Check this for complete code with an example
I think there might be a better way to convert it to a dictionary though. I'll keep looking.

the JsonConvert.DeserializeObject<T> Method takes a JSON string, in other words a serialized object.
You have a deserialized object, so you'll have to serialize it first, which is actually pointless, considering you have all the information you need right there in the JArray object. If you are aiming just to get the objects from the array as key value pairs, you can do something like this:
Dictionary<string, object> myDictionary = new Dictionary<string, object>();
foreach (JObject content in jarray.Children<JObject>())
{
foreach (JProperty prop in content.Properties())
{
myDictionary.Add(prop.Name, prop.Value);
}
}

To turn your JArray into a string, you'll need to assign the key & values of the dictionary for each element. Mario gave a very accurate approach. But there's a somewhat prettier approach as long as you know how to convert each item into your desired type. The below example is for Dictionary<string, string> but can be applied to any Value type.
//Dictionary<string, string>
var dict = jArray.First() //First() is only necessary if embedded in a json object
.Cast<JProperty>()
.ToDictionary(item => item.Name,
item => item.Value.ToString()); //can be modified for your desired type

Assigning Object at Runtime

I want to Achieve Something like this
var mainList = Model.ContentItems;
Dictionary<string, string> dictTerms = new Dictionary<string, string>();
foreach (var outeritems in mainList) {
string page = ".Page";
dynamic Terms = outeritems.ContentItem + page;
}
I am doing this because the object is coming from database and i don't know the object field.
So I will first loop through all the objects and then will do something like this to get the actual value of the field. I know it will convert it to string but is there anything I dont know yet where I can do this.

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.

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

How to handle json object in codebehind - c#

One thing you could have a type with fields in them mapping to the list of objects. While making the ajax call stringify the json object. In your web method recieve it as string. Use Json Deserializer and deserialize it to the type you have created.

Theres a very flexible json framework (JSON.NET) which could help with this, definitley worth considering if your doing a lot of work with JSON http://json.codeplex.com/

Related

Can't store multiple items in IDictionary [duplicate]

Alternate of if and foreach for Linq

How to convert the following JSON array into IDictionary<string, object>?

Assigning Object at Runtime

How to get value from dictionary without knowing key?

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