Develop Reference

How to Get index of a Character in an Unknown Line of a Multiline string in c#

I'm trying to get covid-19 results (only information about Iran) from an Api and show it on a textbox.
and the full result (all countries) that i get from the Api is a json format.
so to get only Iran section i made a Function that loops through lines of the string one by one and check if in that line there is a "{" and if yes get index of that and continue checking if in another line there is a "}" and get index of that too then check if between these, there is "Iran" then add this text (from "{" to "}") in a string:
private string getBetween(string strSourceText, string strStartingPosition, string strEndingPosition)
{
int Starting_CurlyBracket_Index = 0;
int Ending_CurlyBracket_Index = 0;
string FinalText = null;
bool isTurnTo_firstIf = true;
foreach (var line in strSourceText.Split('\r', '\n'))
{
if (isTurnTo_firstIf == true)
{
if (line.Contains(strStartingPosition))
{
Starting_CurlyBracket_Index = line.IndexOf(strStartingPosition); //i think problem is here
isTurnTo_firstIf = false;
}
}
else if (isTurnTo_firstIf == false)
{
if (line.Contains(strEndingPosition))
{
Ending_CurlyBracket_Index = line.IndexOf(strEndingPosition); //i think problem is here
if (strSourceText.Substring(Starting_CurlyBracket_Index, Ending_CurlyBracket_Index - Starting_CurlyBracket_Index).Contains("Iran")) //error here
{
FinalText = strSourceText.Substring(Starting_CurlyBracket_Index, Ending_CurlyBracket_Index - Starting_CurlyBracket_Index);
break;
}
else
{
isTurnTo_firstIf = true;
}
}
}
}
return FinalText;
}
and i call the function like this:
string OnlyIranSection = getBetween(Sorted_Covid19_Result, "{", "}"); //Sorted_Covid19_Result is the full result in json format that converted to string
textBox1.Text = OnlyIranSection;
but i get this Error:
and i know.. its because it gets indexes in the current line but what i need is getting that index in the strSourceText so i can show only this section of the whole result:

USING JSON
As per the comments I read it was really needed to use JSON utility to achieve your needs easier.
You can start with this basic example:
static void Main(string[] args)
{
string jsonString = #"{
""results"": [
{""continent"":""Asia"",""country"":""Indonesia""},
{""continent"":""Asia"",""country"":""Iran""},
{""continent"":""Asia"",""country"":""Philippines""}
]
}";
var result = JsonConvert.DeserializeObject<JsonResult>(jsonString);
var iranInfo = result.InfoList.Where(i => i.Country.ToString() == "Iran").FirstOrDefault();
}
public class JsonResult
{
[JsonProperty("results")]
public List<Info> InfoList { get; set; }
}
public class Info
{
public object Continent { get; set; }
public object Country { get; set; }
}
UPDATE: USING INDEX
As long as the structure of the JSON is consistent always then this kind of sample solution can give you hint.
Console.WriteLine("Original JSON:");
Console.WriteLine(jsonString);
Console.WriteLine();
Console.WriteLine("Step1: Make the json as single line,");
jsonString = jsonString.Replace(" ", "").Replace(Environment.NewLine, " ");
Console.WriteLine(jsonString);
Console.WriteLine();
Console.WriteLine("Step2: Get index of country Iran. And use that index to get the below output using substring.");
var iranIndex = jsonString.ToLower().IndexOf(#"""country"":""iran""");
var iranInitialInfo = jsonString.Substring(iranIndex);
Console.WriteLine(iranInitialInfo);
Console.WriteLine();
Console.WriteLine("Step3: Get inedx of continent. And use that index to get below output using substring.");
var continentIndex = iranInitialInfo.IndexOf(#"""continent"":");
iranInitialInfo = iranInitialInfo.Substring(0, continentIndex-3);
Console.WriteLine(iranInitialInfo);
Console.WriteLine();
Console.WriteLine("Step4: Get the first part of the info by using. And combine it with the initialInfo to bring the output below.");
var beginningIranInfo = jsonString.Substring(0, iranIndex);
var lastOpenCurlyBraceIndex = beginningIranInfo.LastIndexOf("{");
beginningIranInfo = beginningIranInfo.Substring(lastOpenCurlyBraceIndex);
var iranInfo = beginningIranInfo + iranInitialInfo;
Console.WriteLine(iranInfo);
OUTPUT USING INDEX:

Problem in Xamarin.Forms with GetAsync(url) and JsonConvert

This case should be very simple, but I have a little bug that I don't know how to solve. I'm working with a Xamarin.Forms app that does some API calls to a localhost API running in my PC. This is the main part of the API call:
try
{
HttpClient client = new HttpClient();
client.MaxResponseContentBufferSize = BUFFER_SIZE;
client.DefaultRequestHeaders.Add(CULTURE_ID, "es");
client.DefaultRequestHeaders.Add(VALUE, LAST_WEEK_VALUE);
client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(BEARER, token);
var content = new StringContent("", System.Text.Encoding.UTF8, APPLICATION_JSON);
HttpResponseMessage response = await client.GetAsync(url);
var result = await response.Content.ReadAsStringAsync();
List<SubProductParser> prices;
try
{
prices = JsonConvert.DeserializeObject<List<SubProductParser>>(result);
}
catch
{
// exception missin the final character in JSON "]"
}
return prices.ElementAt(0);
}
catch
{
return null;
}
The content of the result variable before trying to do the deserialize:
As you can see is not a valid JSON format, is strange because as you can see in the next screenshot when I do the same API call with POSTMAN is working always perfectly, but I don't know why sometimes doesn't receive all the JSON content when I do the call in the app.
Any idea, seeing the variable result content in debug, sometimes doesn't have the final character of the JSON "]", the API call is made after a button tapped in this way:
private async void Handle_Item_Tapped(object sender, ItemTappedEventArgs e)
{
var selected = e.Item as ProductParser;
var lastPrice= await ApiConnector.GetLastWeekSubProductPrices(
App.ViewModel.LoginViewModel.SesionToken,
subCatViewModel.Selected.ProductId,
subCatViewModel.Selected.Id);
await subCatViewModel.IsFavorite();
subCatViewModel.BarViewModel.Selected = selected;
subCatViewModel.BarViewModel.Categories = _categories;
subCatViewModel.LinearViewModel.Selected = selected;
subCatViewModel.LinearViewModel.Categories = _categories;
await Navigation.PushAsync(new Graphs(subCatViewModel));
}
The API functions that implement this API call, the API is developed in Larvael using php. I tried to simplify them as much as possible:
public static function getLastWeekPrices($cultureId)
{
self::initialize();
$year = self::getLastYear();
$prejson = json_encode(DB::table('product')
->join(SOME_CONDITIONS..)
...
->where(SOME_CONDITIONS..)
...
->select(SOME_ROWS)
->get());
$currentWeek = self::getCurrentWeek();
$json_decoded = json_decode($prejson, true);
$json_final = array();
foreach ($json_decoded as $slider_value)
{
$max_week= DB::table(SOME_CONDITIONS)
->max(SOME_CONDITIONS);
$last_week_price = json_encode(SOME_CONDITIONS)
...
->get());
...
//ADDING SOME VALUES TO $slider_value
...
array_push($json_final, $slider_value);
}
return json_encode($json_final);
}
public static function subProductsPricesQuery($id, $subId, $cultureId, $values)
{
self::initialize();
if (self::doesCultureExist($cultureId)){
if ($values == self::LAST_WEEK) {
$json = self::getLastWeekSubProductPrices($id, $subId, $cultureId);
}
....
}
}
public function FunctionCalledInAPIRoute(Request $request, $id, $subId)
{
try{
$user = JWTAuth::parseToken()->toUser();
$json = DatabaseQuerys::subProductsPricesQuery($id, $subId, $request->header("cultureId"), $request->header("value"));
return self::jsonIsEmpty($json);
}catch(JWTException $e){
return $this->respondInternalError("Any token found!");
}
}
public static function jsonIsEmpty($products)
{
self::initialize();
$initial = $products[0] === "[" ? TRUE : FALSE;
$final = $products[1] === "]" ? TRUE : FALSE ;
if (strlen($products) === 0 || ($initial == TRUE && $final == TRUE))
{
header('Content-type:application/json;charset=utf-8');
return (new self)->respondNotFound("Any result found in this category");
} else {
header('Content-type:application/json;charset=utf-8');
return $products;
}
}
The JsonIsEmpty is a little method that I create to control if the database return something, if not as the functions return json_encoder($array), always will be [].
The content of the variable result when receives the faulty JSON:
[
{
"id": 19,
"name": "Conejo de más de 2125 gr",
"units": "€/Kg",
"price": "1.91",
"week": 10,
"year": 2019,
"last_price": "1.79",
"difference": "0.12",
"arrow": "up_arrow.png"
}
As you can see is missing the closing "]".
I implemented a little test to see if the app is working fine, the test function and the function that calls it:
public static function jsonIsEmptyTest($products)
{
self::initialize();
$initial = $products[0] === "[" ? TRUE : FALSE;
$final = $products[1] === "]" ? TRUE : FALSE ;
if (strlen($products) === 0 || ($initial == FALSE && $final == FALSE))
{
return 1;
} else {
return 0;
}
}
public static function the foo(....)
{
$correct = 0;
$wrong = 0;
for($x = 0; $x < 1000; $x++)
{
$json = DatabaseQuerys::subProductsPricesQuery($id, $subId, $request->header("cultureId"), $request->header("value"));
print_r($json);
print_r("\n\n");
$result = JsonController::jsonIsEmptyTest($json);
if($result == 0)
{
$correct = $correct + 1;
}
if($result == 1)
{
$wrong = $wrong + 1;
}
}
print_r("Correct: ");
print_r($correct);
print_r("\n");
print_r("Wrong: ");
print_r($wrong);
exit();
}
Doing the API call with postman the result is:

SimpleJSON Unity Exception: Error deserializing JSON. Unknown tag: 123

I'm Getting this error when accessing data from a json file.
I'm trying to follow the following tutorial: http://wiki.unity3d.com/index.php/SimpleJSON
and created a test.json file, that I want to extract data from containing:
{
"version": "1.0",
"data": {
"sampleArray": [
"string value",
5,
{
"name": "sub object"
}
]
}
}
using the following code in Unity:
void LoadFiles()
{
FileInfo f = m_info[0]; //Array of Files in Folder
// I had a foreach loop here, but wanted to specify the file for testing before I tried to parse through one of my own
print("I Found : " + f);
var N = JSONNode.LoadFromFile(f.FullName);
var versionString = N["version"].Value; // versionString will be a string containing "1.0"
var versionNumber = N["version"].AsFloat; // versionNumber will be a float containing 1.0
var name = N["data"]["sampleArray"][2]["name"];// name will be a string containing "sub object"
print("vs=" + versionString + " vn=" + versionNumber + " name=" + name);
}
and all i get is Unknown tags, from what I gather from the source :
public static JSONNode Deserialize(System.IO.BinaryReader aReader)
{
JSONBinaryTag type = (JSONBinaryTag)aReader.ReadByte();
switch(type)
{
case JSONBinaryTag.Array:
{
int count = aReader.ReadInt32();
JSONArray tmp = new JSONArray();
for(int i = 0; i < count; i++)
tmp.Add(Deserialize(aReader));
return tmp;
}
case JSONBinaryTag.Class:
{
int count = aReader.ReadInt32();
JSONClass tmp = new JSONClass();
for(int i = 0; i < count; i++)
{
string key = aReader.ReadString();
var val = Deserialize(aReader);
tmp.Add(key, val);
}
return tmp;
}
case JSONBinaryTag.Value:
{
return new JSONData(aReader.ReadString());
}
case JSONBinaryTag.IntValue:
{
return new JSONData(aReader.ReadInt32());
}
case JSONBinaryTag.DoubleValue:
{
return new JSONData(aReader.ReadDouble());
}
case JSONBinaryTag.BoolValue:
{
return new JSONData(aReader.ReadBoolean());
}
case JSONBinaryTag.FloatValue:
{
return new JSONData(aReader.ReadSingle());
}
default:
{
throw new Exception("Error deserializing JSON. Unknown tag: " + type);
}
}
}
I'm falling all the way through the Switch, but with .Value or .AsFloat I should hit those case statements. Any Idea what's going on, is this code to old for Unity 5.0 ?

It seems like I was under false pretenses, that the JSON file was like XML, text, well it seems it is not, or at least assumed to be binary by SimpleJson when reading files. I tried writing the "Text" to a file, and then reading it and it worked fine. So this is an error where I assumed the data in the examples to be text.

JSONNode.LoadFromFile function instead to JSONNode.Parse(string) convert stream to string
System.IO.FileStream fs = System.IO.File.OpenRead(f.FullName);
long length = fs.Length;
byte[] stream = new byte[length];
fs.Read(stream, 0, (int)length);
string json = System.Text.Encoding.UTF8.GetString(stream);
var N = JSONNode.Parse(json);

Format values as a valid json file in C#

I'm trying to write lines in a valid JSON format using C# in a efficient way
What the file should look like:
[
{
"uuid": "c92161ba-7571-3313-9b59-5c615d25251c",
"name": "thijmen321"
},
{
"uuid": "3b90891d-e6fc-44cc-a1a8-e822378ec148",
"name": "TehGTypo"
},
{
"uuid": "5f820c39-5883-4392-b174-3125ac05e38c",
"name": "CaptainSparklez"
}
]
I already have the names and the UUIDs, but I need a way to write them to a file. I want to do this one by one, so, first the file looks like this:
[
{
"uuid": "c92161ba-7571-3313-9b59-5c615d25251c",
"name": "thijmen321"
}
]
Then like this:
[
{
"uuid": "c92161ba-7571-3313-9b59-5c615d25251c",
"name": "thijmen321"
},
{
"uuid": "3b90891d-e6fc-44cc-a1a8-e822378ec148",
"name": "TehGTypo"
}
]
etc. But of course, the UUIDs and the names are different, so how can I do this in a efficient way without using any APIs etc.?
My current (really inefficient) code:
public void addToWhitelist()
{
if (String.IsNullOrEmpty(whitelistAddTextBox.Text)) return;
string player = String.Empty;
try
{
string url = String.Format("https://api.mojang.com/users/profiles/minecraft/{0}", whitelistAddTextBox.Text);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));
request.Credentials = CredentialCache.DefaultCredentials;
using (WebResponse response = request.GetResponse())
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
player = reader.ReadToEnd();
}
catch (WebException ex)
{
Extensions.ShowError("Cannot connect to http://api.mojang.com/! Check if you have a valid internet connection. Stacktrace: " + ex, MessageBoxIcon.Error);
}
catch (Exception ex)
{
Extensions.ShowError("An error occured! Stacktrace: " + ex, MessageBoxIcon.Error);
}
if (String.IsNullOrWhiteSpace(player)) { Extensions.ShowError("This player doesn't seem to exist.", MessageBoxIcon.Error); return; }
player = player.Replace(",\"legacy\":true", "")
.Replace("\"id", " \"uuid")
.Replace("\"name", " \"name")
.Replace(",", ",\n")
.Replace("{", " {\n")
.Replace("}", "\n },");
File.WriteAllText(Program.programPath + #"\Servers\" + servers[currentIndex].Name + #"\whitelist.json", "");
try
{
using (StreamWriter sw = File.AppendText(Program.programPath + #"\Servers\" + servers[currentIndex].Name + #"\whitelist.json"))
{
sw.WriteLine("[");
foreach (string s in File.ReadAllLines(Program.programPath + #"\Servers\" + servers[currentIndex].Name + #"\whitelist.json"))
if (s.Contains("[") || s.Contains("]") || s.Equals(Environment.NewLine)) continue;
else sw.WriteLine(s);
sw.WriteLine(player);
sw.WriteLine("]");
whitelistListBox.Items.Add("\n" + whitelistAddTextBox.Text);
}
}
catch (Exception ex) { Extensions.ShowError("An error occured while update whitelist.json! Stacktrace: " + ex); }
whitelistAddTextBox.Clear();
}

The recommand "Microsoft" way is with a data contract and the DataContractJsonSerializer.. see here
https://msdn.microsoft.com/de-de/library/system.runtime.serialization.json.datacontractjsonserializer%28v=vs.110%29.aspx
an example of the contact would be:
[DataContract]
internal class Person
{
[DataMember]
internal string name;
[DataMember]
internal string Uuid ;
}
you use the class in the following way (obviously)
Person p = new Person();
p.name = "John";
p.Uuid = "3b90891d-e6fc-44cc-a1a8-e822378ec148";
and serialize it with the Contract Serializer
MemoryStream stream1 = new MemoryStream();
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Person));
ser.WriteObject(stream1, p);
example to show the serialzed data:
stream1.Position = 0;
StreamReader sr = new StreamReader(stream1);
Console.WriteLine(sr.ReadToEnd());

Try json.net it will do the serialization job for you: http://www.newtonsoft.com/json

I would use a JSON Serializer like http://www.newtonsoft.com/json
This would allow you to roll your uuid/name as a class, instead of doing the parsing yourself
So something like:
internal class UuidNamePair
{
string Uuid { get; set; }
string Name { get; set; }
}
Then when calling this, you would just do something like this:
List<UuidNamePair> lst = new List<UuidNamePair>();
lst.Add(new UuidNamePair() { Name = "thijmen321", Uuid = "c92161ba-7571-3313-9b59-5c615d25251c" });
lst.Add(new UuidNamePair() { Name = "TehGTypo", Uuid = "3b90891d-e6fc-44cc-a1a8-e822378ec148" });
string json = JsonConvert.SerializeObject(lst, Formatting.Indented);
Console.WriteLine(json);
Instead of the Console.WriteLine, you could do your POST to a web service or however you're trying to use this json.

trouble comparing strings in wp7 application

Here is a sample of my code.
Here I recieve a string variable from another page.
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
string newparameter = this.NavigationContext.QueryString["search"];
weareusingxml();
displayResults(newparameter);
}
private void displayResults(string search)
{
bool flag = false;
try
{
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("People.xml", FileMode.Open))
{
XmlSerializer serializer = new XmlSerializer(typeof(List<Person>));
List<Person> data = (List<Person>)serializer.Deserialize(stream);
List<Result> results = new List<Result>();
for (int i = 0; i < data.Count; i++)
{
string temp1 = data[i].name.ToUpper();
string temp2 = "*" + search.ToUpper() + "*";
if (temp1 == temp2)
{
results.Add(new Result() {name = data[i].name, gender = data[i].gender, pronouciation = data[i].pronouciation, definition = data[i].definition, audio = data[i].audio });
flag = true;
}
}
this.listBox.ItemsSource = results;
}
catch
{
textBlock1.Text = "error loading page";
}
if(!flag)
{
textBlock1.Text = "no matching results";
}
}
Nothing is loaded into the list when the code is run, I just get the message "no matching results".

Looks like you are trying to do a contains search (my guess based on your addition of the * around the search string. You can remove the '*' and do a string.Contains match.
Try this.
string temp1 = data[i].name.ToUpper();
string temp2 = search.ToUpper()
if (temp1.Contains(temp2))
{

It looks like you are trying to check if one string contains another (ie substring match) and not if they are equal.
In C#, you do this like this:
haystack = "Applejuice box";
needle = "juice";
if (haystack.Contains(needle))
{
// Match
}
Or, in your case (and skip the * you added to the string temp2)
if (temp1.Contains(temp2))
{
// add them to the list
}

Have you checked to make sure data.Count > 0?