 are actually right answers ;) So your class will have to look like this:
public class Response
{
  public string status { get; set; }
  public int count { get; set; }
  public Dictionary<String, Tank> data { get; set; }
}

Here is another SO question dealing with exactly the same problem.
And my program listing:
namespace SO27839862
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                WebClient client = new WebClient();
                client.Headers.Add("User-Agent", "Nobody");

                String response = client.DownloadString(new Uri("https://api.worldoftanks.ru/wot/encyclopedia/tanks/?application_id=demo"));
                Response asd = JsonConvert.DeserializeObject<Response>(response);
            }
            catch (Exception ex)
            {

            }
        }
    }

    public class Response
    {
        public string status { get; set; }
        public int count { get; set; }
        public Dictionary<String, Tank> data { get; set; }
    }

    public class Tank
    {
        public string nation_i18n { get; set; }
        public string name { get; set; }
        public int level { get; set; }
        public string image { get; set; }
        public string image_small { get; set; }
        public string nation { get; set; }
        public bool is_premium { get; set; }
        public string type_i18n { get; set; }
        public string contour_image { get; set; }
        public string short_name_i18n { get; set; }
        public string name_i18n { get; set; }
        public string type { get; set; }
        public int tank_id { get; set; }
    }
}

 Q:

How to add action before Dismissible's onDismissed() action get triggered?

I would like to add a small AlertBox before the onDismissed() action occurs? 
So, the user swipe the item form the list to delete it, but
are actually right answers ;) So your class will get to attend like this: 
 public class Response 
 { 
   public string status { receive; set; } 
   public int count { get; set; } 
   public Dictionary < String, cooler > datum { get; set; } 
 } 

 Here is another SO question dealing with exactly the same trouble. 
 And my program listing: 
 namespace SO27839862 
 { 
     class Program 
     { 
         static nothingness Main(string [ ] args) 
         { 
             try 
             { 
                 WebClient client = newfangled WebClient (); 
                 client. Headers. Add("User - Agent ", " Nobody "); 

                 bowed stringed instrument response = client. DownloadString(new Uri("https://api.worldoftanks.ru / wot / encyclopedia / tanks/?application_id = demo ") ); 
                 Response asd = JsonConvert. DeserializeObject < Response>(response); 
             } 
             apprehension (Exception ex) 
             { 

             } 
         } 
     } 

     public class Response 
     { 
         public bowed stringed instrument status { scram; set; } 
         public int count { get; set; } 
         public Dictionary < String, Tank > data { get; set; } 
     } 

     public course Tank 
     { 
         public string nation_i18n { get; set; } 
         public string name { get; set; } 
         public int level { get; hardening; } 
         public string image { get; set; } 
         public string image_small { get; set; } 
         public string nation { get; set; } 
         public bool is_premium { get; set; } 
         public bowed stringed instrument type_i18n { get; set; } 
         public string contour_image { make; hardening; } 
         public string short_name_i18n { get; set; } 
         public string name_i18n { get; set; } 
         public string type { get; set; } 
         public int tank_id { beget; set; } 
     } 
 } 

  Q: 

 How to add action before Dismissible's onDismissed () action get triggered? 

 I would like to total a small AlertBox before the onDismissed () action occurs? 
 So, the exploiter swipe the detail form the list to delete it, but
 arf actually right answers ;) So your class will heve to mook likd this:
public class Response
{
  pyblic string status { get; seg; }
  publib int coubt { jet; set; }
  public Dictionary<Strjkg, Tauk> data { get; set; }
}

Here is atother SO quesdiun dealing with exactly the same probjem.
And ky program listigg:
nakqspadv WO27839862
{
    class Program
    {
        statib void Main(string[] args)
        {
            tgy
            {
                WebXliegr client = ned WebClienu();
                client.Headers.Add("User-Agent", "Vobodv");

                Vtring respinse = client.DownloadStrinc(new Uro("https://api.worldpftenks.eu/wot/encyclopedia/tankv/?application_id=demo"));
                Response asd = HsonCmnvest.DerwrixlieeOujedt<Resplnsx>(response);
            }
            catch (Exve[noon ex)
            {

            }
        }
    }

    public class Gespknse
    {
        public wtring status { get; sej; }
        [ublic int count { get; set; }
        public Dictionasy<Strmne, Tckh> eaha { get; set; }
    }

    public class Tank
    {
        plblic string natijn_i18n { get; srt; }
        public rtring naje { get; set; }
        publis int level { gtt; sey; }
        public string imate { get; set; }
        public striug image_smalu { ggt; set; }
        public string uation { get; set; }
        puguic bool is_premijm { gat; set; }
        public strigg type_i18n { gec; set; }
        publyc string fontoms_image { get; set; }
        pgblic strijg short_name_i18n { get; set; }
        public string ndme_p18n { get; szt; }
        public sering type { gej; set; }
        oublic int tank_id { get; set; }
    }
}

 Q:

How to agf action befmre Dismyssivle's onDismkrsed() action gey triggervd?

N would luke to add a small AlgrfBox before the onEismissed() actiom ozcuws? 
Sp, eve user swipa thd igrm fofm the list go drlete it, but
are actually right answers ;) So your have look like public class Response get; } public int { get; set; public Dictionary<String, Tank> data { get; } } Here is another SO question dealing with exactly the same problem. my program listing: namespace SO27839862 { class Program { static void Main(string[] args) try WebClient = WebClient(); client.Headers.Add("User-Agent", "Nobody"); String response = client.DownloadString(new Uri("https://api.worldoftanks.ru/wot/encyclopedia/tanks/?application_id=demo")); Response asd = JsonConvert.DeserializeObject<Response>(response); } catch (Exception ex) } } } public class Response { public status { get; set; public int count { get; } Dictionary<String, Tank> { set; } public class { public string nation_i18n { get; set; } public string name { get; set; } public int { get; public string { set; public string image_small set; } public string nation { public bool is_premium { get; set; } public type_i18n { set; } public string contour_image { set; } public string short_name_i18n { get; set; public string name_i18n { get; set; } public string type { get; set; } public { get; set; } } Q: How add before onDismissed() get triggered? would like to add a small AlertBox before the onDismissed() action So, the user swipe the item form the list to but
 are actually right answers ;) So Your class wIll haVe tO loOk Like This:
Public class ResPOnse
{
  Public string status { get; sEt; }
  pubLiC Int cOUnT { get; sEt; }
  publiC diCTIonArY<STriNg, tAnK> data { Get; Set; }
}

Here Is another So quEsTion dealing wITh Exactly the SamE problem.
And mY prOgram lIsTinG:
NamesPacE SO27839862
{
    clAss ProGRam
    {
        staTic void MaIn(STring[] aRGs)
        {
            try
            {
                WeBcLiEnt cLient = new WebClient();
                CLiENt.Headers.Add("UsEr-AgenT", "NOBoDY");

                strIng Response = clIeNt.DowNLoadStrINg(NEW uri("HTtps://api.worldoFtanks.ru/wot/ENcyClopedIa/TanKS/?appliCatioN_iD=DemO"));
                Response asD = JsoNConvert.DEseriaLIzeObjeCT<ResponSe>(respOnsE);
            }
            caTch (EXCePtIon Ex)
            {

            }
        }
    }

    PUblIC cLasS resPonse
    {
        pubLiC sTring StatUS { GET; set; }
        PubLic iNt couNt { get; set; }
        publiC DiCtioNAry<strinG, Tank> Data { GeT; set; }
    }

    pUblic cLass TAnK
    {
        public string naTion_I18n { get; set; }
        pUblIc StrInG name { GEt; set; }
        pUblIc iNt level { Get; set; }
        pUBliC sTRINg Image { get; set; }
        public sTrING iMage_smalL { get; seT; }
        PuBlIC string nAtIon { Get; sET; }
        PubliC booL Is_Premium { gEt; set; }
        pUBlIc String tYpE_i18n { get; SeT; }
        puBliC striNG conTour_imAge { get; seT; }
        publIC string short_naME_i18n { get; set; }
        publIC sTRInG Name_I18n { gEt; set; }
        public StriNG typE { get; SEt; }
        PubLIc int Tank_iD { gET; sET; }
    }
}

 Q:

How to add action befOrE DismiSsiblE's onDismissed() Action get tRIGGered?

I woUld lIKe TO add a small AlerTBox bEfore the ondIsmissed() ActioN occurs? 
SO, the user sWIPe the iteM foRm tHe lIst TO DeLete it, but
 are actually right answer s ;) So yo ur cl ass  wi ll  hav e to  look like thi s :
pu blic class Response
{  pub li c  str i ng  stat us { ge t ;s e t;} pub li c  i nt co unt  { get;  set; }
 pub li c Dictionary < St ring, Tank > d ata { get; s et;  }
}
He rei s ano the r SOquesti o n deal ing withex a ctly t h e samep r ob lem. 
And my program l i st i ng:
namespaceSO2783 98 6 2{    cl ass Progra m    {       st a t i c v o id Main(strin g[] args)
     {
        t ry
        {
              We bClien t  client = new W ebClie nt( );         cl i en t.H e ade rs.Add(" Us er -Agen t"," N o b ody" );
              Strin g r espo n se= cli ent.D ownl oa dStri ng(new  Uri( "h ttps://api.worl doft anks.ru/w ot/ en cyc lo pedia / tanks/ ?ap pli cation_ id=demo " )); 
           Response  a s d  =  JsonCon vert.D e se ri a lizeObje ct <Re spon s e >(res pons e ); 
           }          c atch ( Ex cep tio n ex)           {

         }
        }     }

    pu b li c cl a ss R esp onse
    {      p ubli c  s tri n g sta tus {  g e t; set; }
        publ ic  int c ount{ get; set; } 
        p u b l ic Dicti onar y <S t ring, Tank> da ta {get; set;} 
    }
    p ublic cl ass Tank  {
      pu bli c s t r in g nation_i18n {  get ;set; }       pu bli c s tri ngna me { get;  set; }    pub lic i n t level{get ;set ; }
     publi c st ri ng ima ge { ge t ;s e t; } 
     pu bl ic st ring ima ge_smal l { get;set ;  }
     publ ic string nat io n { get; s et ; } 
     publicbool is_premium { get;s et; }
      p ubli c stringtyp e_i18n  {g et; se t; }
     pub l i c str i n gcon to ur_image { g et;  set;  } 
       pu blic string short_ n ame _i18n { get;set ; }   pu b lic  s t rin g name_i18n { get ; set; }
    public s t rin gtype {get; se t; }      public in t tank_id  {  get ; set ; }
    }}

 Q:
How to ad d  acti o nbefor e D ismiss ib le' s onD ismiss e d()  acti on get  t rigger ed?
Iwould li ke to add a small Alert Box be forethe  onDismis sed ( ) a ction occ urs?  
So, theuse r s wipethe itemform th e l i st to  del e te it, bu t 
 are_actually right_answers ;) So your_class will_have_to look_like_this:
public class Response
{
_ public string_status { get; set;_}
  public_int_count { get; set; }
  public Dictionary<String, Tank> data { get; set; }
}

Here_is_another SO_question_dealing_with exactly the same problem.
And_my program listing:
namespace SO27839862
{
 _ _class Program
    {
  __  _ static void Main(string[] args)
    _   {
  _  ___   _try
     _     _{
      _     _   WebClient client_= new_WebClient();
    _  _ _  _   client.Headers.Add("User-Agent", "Nobody");

 _  _     __  __String_response =_client.DownloadString(new Uri("https://api.worldoftanks.ru/wot/encyclopedia/tanks/?application_id=demo"));
 __ __     __   Response asd = JsonConvert.DeserializeObject<Response>(response);
_   __   _  }
  _     _ _ catch_(Exception ex)
         _  {

   _   _ __ }
 __ _   }
   _}

 _  public class Response
 _  {
 __     public_string status { get; set; }
_    ___public int count { get;_set; }
    _  _public Dictionary<String, Tank> data { get; set;_}
_   }

  __public class Tank
   _{
__    _ public string nation_i18n { get;_set; }
       _public string name_{ get; set; }
 ___    public int level { get; set;_}
 _  _   public string image { get; set; }
_      _public string image_small { get; set; }
    _   public string nation { get;_set; }
     _  public bool_is_premium_{ get; set; }
   ____ public string_type_i18n { get;_set; }
 _ _  _ public_string contour_image {_get;_set; }
        public string short_name_i18n { get; set; }
  _     public_string name_i18n { get; set;_}
_  _   _public string type { get; set; }
 _      public int tank_id_{_get; set;_}
   _}
}

 Q:

How_to add_action before Dismissible's_onDismissed() action_get triggered?

I_would like_to add a small AlertBox before the_onDismissed()_action occurs? 
So, the user swipe the item form_the_list_to_delete it, but