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Fragment cannot find variable from other Fragment

I have a problem. I have 2 Android.Support.V4.App.Fragments
In the first Framgent I use this code:
AgentSpinnerAdapter = new ArrayAdapter<string>(Context, Android.Resource.Layout.SimpleSpinnerDropDownItem);
AgentSpinner.Adapter = AgentSpinnerAdapter;
foreach (string[] str in NamesArray)
{
string AgentId = str[0];
string Owner = str[1];
string Exchange = str[2];
string Remark = str[3];
AgentSpinnerAdapter.Add("Agent " + AgentId + " - " + Owner + " - " + Remark);
}
In the second Fragment I call this line:
dbValue = Fragment1.AgentSpinnerAdapter.GetItem(0);
But it says that AgentSpinnerAdapter is a nullreference, which is weird, because it get's filled. I have set the AgentSpinnerAdapter to Public static. Also in my MainActivity I first create Fragment1 and then Fragment2 like this:
Fragment1 = Fragment1.NewInstance();
Fragment2 = Fragment2.NewInstance();
What am I doing wrong?
UPDATE
Here is the full Fragment1.cs method
public void LoadAgentSpinner()
{
string json = "";
try
{
string html = string.Empty;
string url = "https://www.efy.nl/app/getagents.php";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
IgnoreBadCertificates();
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (Stream stream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(stream))
{
json = reader.ReadToEnd();
}
}
catch (Exception ex1)
{
try
{
WebClient client = new WebClient();
NameValueCollection fields = new NameValueCollection();
fields.Add("error", ex1.GetBaseException().ToString());
string url = "https://www.mywebsite.com";
IgnoreBadCertificates();
byte[] respBytes = client.UploadValues(url, fields);
string resp = client.Encoding.GetString(respBytes);
SelectedQuantity.Text = "";
SelectedLimit.Text = "";
}
catch (Exception ex2)
{
string exFullName = (ex2.GetType().FullName);
string ExceptionString = (ex2.GetBaseException().ToString());
}
}
//Parse json content
var jObject = JObject.Parse(json);
//Create Array from everything inside Node:"Coins"
var agentPropery = jObject["Agents"] as JArray;
//Create List to save Coin Data
agentList = new List<agent>();
//Find every value in Array: coinPropery
foreach (var property in agentPropery)
{
//Convert every value in Array to string
var propertyList = JsonConvert.DeserializeObject<List<agent>>(property.ToString());
//Add all strings to List
agentList.AddRange(propertyList);
}
//Get all the values from Name, and convert it to an Array
string[][] NamesArray = agentList.OrderBy(i => i.AgentId)
.Select(i => new string[] { i.AgentId.ToString(), i.Owner, i.Exchange, i.Remark })
.Distinct()
.ToArray();
AgentSpinnerAdapter = new ArrayAdapter<string>(Context, Android.Resource.Layout.SimpleSpinnerDropDownItem);
AgentSpinner.Adapter = AgentSpinnerAdapter;
foreach (string[] str in NamesArray)
{
string AgentId = str[0];
string Owner = str[1];
string Exchange = str[2];
string Remark = str[3];
AgentSpinnerAdapter.Add("Agent " + AgentId + " - " + Owner + " - " + Remark); // format your string here
}
if(MainActivity.db.CheckExistTableSettings("Default Agent") == true)
{
string Value = MainActivity.db.SelectValueFromTableSettings("Default Agent");
int spinnerPosition = AgentSpinnerAdapter.GetPosition(Value);
AgentSpinner.SetSelection(spinnerPosition);
}
else
{
AgentSpinner.SetSelection(0);
}
}

In a few of my applications it's necessary to access the other fragments from my main Activity, so we do the following:
public class MainActivity : AppCompatActivity, BottomNavigationView.IOnNavigationItemSelectedListener
{
public static Dictionary<string, Fragment> FragmentList { get; set; }
private Fragment currentFragment = null;
private BottomNavigationView navigation;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.layout_mainactivity);
// create our fragments and initialise them early.
if (FragmentList == null)
{
FragmentList = new Dictionary<string, Fragment>
{
{ "main", MainFragment.NewInstance() },
{ "bugreport", BugReportFragment.NewInstance() },
{ "settings", SettingsFragment.NewInstance() }
};
}
navigation = FindViewById<BottomNavigationView>(Resource.Id.bottom_nav);
navigation.SetOnNavigationItemSelectedListener(this);
navigation.SelectedItemId = Resource.Id.navigation_main;
}
public bool OnNavigationItemSelected(IMenuItem item)
{
if (!popAction)
{
navigationResourceStack.Push(item.ItemId);
}
switch (item.ItemId)
{
case Resource.Id.navigation_main:
currentFragment = FragmentList["main"];
break;
case Resource.Id.navigation_settings:
currentFragment = FragmentList["settings"];
break;
case Resource.Id.navigation_bugreport:
currentFragment = FragmentList["bugreport"];
break;
}
if (currentFragment == null)
{
return false;
}
else
{
FragmentManager.BeginTransaction().Replace(Resource.Id.frame_content, currentFragment).Commit();
return true;
}
}
}
What this means is you could do something like MainActivity.FragmentList["main"] and then call any public method on the actual initialized class because a pointer to it is stored within the dictionary.

Take 1gb ram to parse json object and give System.OutOfMemoryException after performing any other filter [duplicate]

This question already has answers here:
How to parse huge JSON file as stream in Json.NET?
(5 answers)
Closed 4 years ago.
public void ReadJsonFile()
{
try
{
string json = string.Empty;
using (StreamReader r = new StreamReader(val))
{
json = r.ReadToEnd();
var test = JObject.Parse(json);
JArray items = (JArray)test["locations"];
int length = items.Count;
data = new List<Info>();
for (int i = 0; i < items.Count; i++)
{
var d = test["locations"][i]["timestampMs"];
double dTimeSpan = Convert.ToDouble(d);
DateTime dtReturn = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(Math.Round(dTimeSpan / 1000d)).ToLocalTime();
string printDate = dtReturn.DayOfWeek.ToString() + "," + " " + dtReturn.ToShortDateString() + " " + dtReturn.ToShortTimeString();
day = dtReturn.DayOfWeek.ToString();
date = dtReturn.ToShortDateString();
time = dtReturn.ToShortTimeString();
var e = test["locations"][i]["latitudeE7"];
var f = test["locations"][i]["longitudeE7"];
var n = test["locations"][i]["accuracy"];
accuracy = n.ToString();
// getLocationByGeoLocation(e.ToString(), f.ToString());
var g = test["locations"][i]["activity"] != null;
if (g == true)
{
JArray items1 = (JArray)test["locations"][i]["activity"];
int length1 = items1.Count;
while (j < items1.Count)
{
if (j == 0)
{
var h = test["locations"][i]["activity"][j]["activity"][j]["type"];
type = h.ToString();
j = 1;
}
else { }
j++;
}
j = 0;
}
else { }
Info ddm = new Info(day, date, time, lat, longi, address, accuracy, type);
data.Add(ddm);
type = "";
}
}
return;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
I am trying to parse JSON file. val is the name of my file to parse. Using StreamReader I am reading each line when I am trying to parse using jObject I will take around 1gb memory and give me System.OutOfMemoryException how can I parse JObject using small memory.
Please help me with this I don't have much idea of JSON.

Please read about JSON thoroughly. NewtonSof.JSON is are very famous library and it is well documented. Let us get back to your problem. As mentioned in comments you have lots of unnecessary middle steps while trying to parse your file. Moreover, you are trying to parse a big file in one go!. First thing first, this is the layout for your JSON
public partial class Data
{
[JsonProperty("locations")]
public Location[] Locations { get; set; }
}
public partial class Location
{
[JsonProperty("timestampMs")]
public string TimestampMs { get; set; }
[JsonProperty("latitudeE7")]
public long LatitudeE7 { get; set; }
[JsonProperty("longitudeE7")]
public long LongitudeE7 { get; set; }
[JsonProperty("accuracy")]
public long Accuracy { get; set; }
}
And while you are deserilazing you should do it object by object, not all at once
The following assumes that your stream is made of Data type of objects, if it is, made up of Location type of objects you have to change it
using (StreamReader streamReader = new StreamReader(val))
using (JsonTextReader reader = new JsonTextReader(streamReader))
{
reader.SupportMultipleContent = true;
var serializer = new JsonSerializer();
while (reader.Read())
{
if (reader.TokenType == JsonToken.StartObject)
{
var data = serializer.Deserialize<Data>(reader);
//data.locations etc etc..
}
}
}

I could fix the System.OutOfMemoryException with the following steps:
If you are not using Visual Studio Hosting Process:
Uncheck the option:
Project->Properties->Debug->Enable the Visual Studio Hosting Process
if still the problem remains:
Go to Project->Properties->Build Events->Post-Build Event Command line and paste this 2 lines
call "$(DevEnvDir)..\..\vc\vcvarsall.bat" x86
"$(DevEnvDir)..\..\vc\bin\EditBin.exe" "$(TargetPath)" /LARGEADDRESSAWARE
Now, build the project

Instagram API: How to insert all user media in c# asp.net mvc?

I am trying the get all user media from the instagram api and store into database but how can do that i don't know. i am write the code but using this code just add one media in the database. any one have the idea then please let me know how can do that. here below list the my code.
This is my C# method :
public string makePostFromInstagram()
{
var serializer1 = new System.Web.Script.Serialization.JavaScriptSerializer();
var nodes1 = serializer1.Deserialize<dynamic>(GetData(strInstagramUserId));
foreach (var date in nodes1)
{
if (date.Key == "data")
{
string theKey = date.Key;
var thisNode = date.Value;
int userCount = 0;
foreach (var post in thisNode)
{
if (thisNode[userCount]["username"] == strInstagramUserId)
{
id = thisNode[userCount]["id"].ToString();
}
userCount++;
}
}
}
var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
Dictionary<string, object> csObj = serializer.Deserialize<Dictionary<string, object>>(GetRecentPost(id, accessToken));
int length = ((ArrayList)csObj["data"]).Count;
var nodes = serializer.Deserialize<dynamic>(GetRecentPost(id, accessToken));
foreach (var date in nodes)
{
if (date.Key == "data")
{
string theKey = date.Key;
var thisNode = date.Value;
foreach (var post in thisNode)
{
UsersOnInstagram objUserInsta = new UsersOnInstagram();
string result = null;
//here i am add just one image so i want to here add multiple image insert
if (post["type"] == "image")
result = UsersOnInstagram.addInstagramPost(strPtId, HttpUtility.UrlEncode(post["caption"]["text"]), post["images"]["standard_resolution"]["url"], UnixTimeStampToDateTime(Convert.ToDouble(post["created_time"])), null, post["type"]);
else if (post["type"] == "video")
result = objUserInsta.addInstagramPost(HttpUtility.UrlEncode(post["caption"]["text"]), strPtId, post["images"]["standard_resolution"]["url"], UnixTimeStampToDateTime(Convert.ToDouble(post["created_time"])), post["videos"]["standard_resolution"]["url"], post["type"]);
}
}
}
Response.End();
}
this is my api method :
public static string GetRecentPost(string instagramaccessid, string instagramaccesstoken)
{
Double MAX_TIMESTAMP = DateTimeToUnixTimestamp(DateTime.Today.AddDays(-1));
Double MIN_TIMESTAMP = DateTimeToUnixTimestamp(DateTime.Today.AddDays(-2));
string url = "https://api.instagram.com/v1/users/" + instagramaccessid + "/media/recent?access_token=" + instagramaccesstoken + "&min_timestamp=" + MIN_TIMESTAMP + "&maz_timestamp=" + MAX_TIMESTAMP;
var webClient = new System.Net.WebClient();
string d = webClient.DownloadString(url);
return d;
}
any one know how can do that please let me know.

How do I get an array in JSON and loop through it to get its elements

In C# I make a GET reqeust to get som JSON data. In this JSON data there is an array, which I want to return the elements in this data. I'm using Json.NET to try to achieve this.
Here is my C# code to get a property in the JSON file.
public static string sendRequest(string url, string method)
{
try
{
// Set reqiued information for api
var httpWebRequest = (HttpWebRequest)WebRequest.Create(main_url + url);
httpWebRequest.ContentType = "application/x-www-form-urlencoded";
httpWebRequest.Headers.Add("Authorization", "Bearer " + Current_Access_Token);
httpWebRequest.Accept = "application/json;v=1";
httpWebRequest.Method = method;
// Get adn return responses
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
string respStr = new StreamReader(httpResponse.GetResponseStream()).ReadToEnd();
return respStr;
}
catch (Exception e)
{
MessageBox.Show("No response");
}
return "";
}
public static string GetUserName()
{
string resp = sendRequest("api.php/currentCustomer/", "GET");
JObject jObject = JObject.Parse(resp);
JToken Juser = jObject["response"];
string UserName = (string)Juser["data"]["customer"]["name"];
return UserName;
}
The code above is how I return the name of a customer under customer. But under customer there is an array, "active_digital_subscriptions". In this array there is 2 elements which I want to access and save in setting.setting. "active_digital_subscriptions" only contains string.
JSON data:
{
"response":{
"code":200,
"status":"success",
"data":{
"customer":{
"id":"109701",
"email":"ahjune152#one.com",
"name":"ahjune152",
"first_name":"Loc",
"last_name":"Dai Le",
"registration_date":"2015-06-17",
"last_login_date":"2015-11-05",
"is_newsletter_subscriber":"1",
"digital_password":"YOtI1cuzL18dO3i9T9CBVCiX3lQa3iIPhcWDgiwHxxI=",
"language":{
"id":"1",
"name":"American english",
"code":"en"
},
"currency":{
"id":"1",
"name":"Danske kroner",
"sign":"DKK",
"code":"DKK",
"number":"208"
},
"preferred_platforms":[
],
"active_digital_subscriptions":[
{
"plan_id":"246",
"plan_title":"VIP Partner"
}
]
}
}
}
}

You can use SelectToken and SelectTokens for this purpose. Both support JSONPath query syntax:
var userName = (string)Juser.SelectToken("data.customer.name");
var customersItems = Juser.SelectTokens("data.customer.customers_items[*]")
.Select(t => (string)t)
.ToArray();
[*] is a wildcard that selects all elements in the array.
Update
Given your revised JSON, you can get the active user and active subscriptions like so:
var userName = (string)Juser.SelectToken("data.customer.name");
var activeSubscriptions = Juser.SelectTokens("data.customer.active_digital_subscriptions[*]")
.Select(t => new { PlanId = (string)t["plan_id"], PlanTitle = (string)t["plan_title"] })
.ToArray();
Note that the active subscriptions are in an array, so it would appear possible that there could be more than one. If you know there is only one, you can do
var activeSubscription = activeSubscriptions.SingleOrDefault();
Here I am returning the subscriptions in an anonymous type but you could define an explicit class if you prefer:
public class Subscription
{
public string PlanId { get; set; }
public string PlanTitle { get; set; }
}
And then do:
var activeSubscriptions = Juser.SelectTokens("data.customer.active_digital_subscriptions[*]")
.Select(t => new Subscription { PlanId = (string)t["plan_id"], PlanTitle = (string)t["plan_title"] })
.ToArray();

You could try this -
var subs = (JArray)JObject.Parse(json)["response"]["data"]["customer"]["active_digital_subscriptions"];
for (var i = 0; i < subs.Count; ++i)
{
var id = ((JValue)subs[i]["plan_id"]).Value;
var title = ((JValue)subs[i]["plan_title"]).Value;
}

error Object reference not set to an instance of an object when check Facebook Like?

I had error
Object reference not set to an instance of an object
at:
string[] sB64String = payload.Split('.');
When check if user like the my Facebook page, my code-
protected void Page_Load(object sender, EventArgs e)
{
pageLike();
}
public bool ValidateSignedRequest()
{
string facebooksecret =
System.Configuration.ConfigurationManager.AppSettings["FacebookSecret"];
var VALID_SIGNED_REQUEST = Request.Form["signed_request"];
string applicationSecret = facebooksecret;
string[] signedRequest = VALID_SIGNED_REQUEST.Split('.');
string expectedSignature = signedRequest[0];
string payload = signedRequest[1];
// Attempt to get same hash
var Hmac = SignWithHmac(UTF8Encoding.UTF8.GetBytes(payload), UTF8Encoding.UTF8.GetBytes(applicationSecret));
var HmacBase64 = ToUrlBase64String(Hmac);
return (HmacBase64 == expectedSignature);
}
private string ToUrlBase64String(byte[] Input)
{
return Convert.ToBase64String(Input).Replace("=", String.Empty)
.Replace('+', '-')
.Replace('/', '_');
}
private byte[] SignWithHmac(byte[] dataToSign, byte[] keyBody)
{
using (var hmacAlgorithm = new HMACSHA256(keyBody))
{
hmacAlgorithm.ComputeHash(dataToSign);
return hmacAlgorithm.Hash;
}
}
public Dictionary<string, string> DecodePayload(string payload)
{
//Remove the bad part of signed_request
//Begin
string[] sB64String = payload.Split('.');
payload = payload.Replace((sB64String[0] + "."), string.Empty);
//End
var encoding = new UTF8Encoding();
var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 - decodedJson.Length % 4) % 4, '='));
var json = encoding.GetString(base64JsonArray);
var jObject = JObject.Parse(json);
var parameters = new Dictionary<string, string>();
parameters.Add("page", ((bool)jObject["page"]["liked"]).ToString());
parameters.Add("admin", ((bool)jObject["page"]["admin"]).ToString());
return parameters;
}
protected void pageLike()
{
string pageLiked = string.Empty;
var signed_request = Request.Form["signed_request"];
var json = DecodePayload(signed_request);
foreach (KeyValuePair<string, string> objKVP in json)
{
//Note You can also see if a user is an admin by replacing the objKVP.Key with admin
if (objKVP.Key == "page" && objKVP.Value == "True")
{
Response.Redirect("https://facebookapp.elarabygroup.com/instruction.aspx");
//litJson.Text += objKVP.Key + " - " + objKVP.Value + "<br />";
}
}
}

I can't see anything fundamentally wrong with your code, what I suspect is happening is the request form variable is null i.e.
var signed_request = Request.Form["signed_request"];
the payload variable is being set to a null or empty string. I'd check this and make sure the value is what you expect.
A good idea here is to add a guard clause in DecodePayload to make sure the payload variable has a value before calling the Split method.
e.g.
if (string.IsNullOrEmpty(payload))
throw new ArgumentNullException();