 => "?áAMKá!J°"Yüf> ¶"},
            {:name => "CertStoreLocation", :type => :binary, :data => ""}
           ]
    action :create
end

A:

For encoding binary data you are probably best off either using a base64'd string literal:
require 'base64'
values [{:data => Base64.decode64("YmluYXJ5ZGF0YQ==")}]

or using the \x escape sequence:
values [{:data => "\x45\xA0\xFF\x00"}]

 Q:

Value cannot be null. Parameter name: connectionString when i run add-migration

I am trying to write my connection string in my appsettings.json file and bring it into my startup file but I keep getting a Value cannot be null. Parameter name: connectionString.
I had the following error in package manager console when Add-Migration.
This is my startup:

namespace WebApi
{

    public class Startup
    {

        private string _connectionString = null;

        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            _connectionString = Configuration["secretConnectionString"];
            services.AddMvc();
  
            services.AddEntityFrameworkNpgsql().AddDbContext<ApiContext>
                (Options => Options.UseNpgsql(_connectionString));

        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
        }
    }
}

appsettings.json:

"connectionString": {
    "_connectionString": " User Id=Pdev; Password=abcd;Server=localhost;Port=5432;Database=Advantage.Api.Dev;Integrated Security=true
= > "? áAMKá!J ° "Yüf > ¶ " }, 
             {: name = > " CertStoreLocation ", : type = >: binary, : data = > " " } 
            ] 
     action: create 
 goal 

 deoxyadenosine monophosphate: 

 For encoding binary data you are probably good off either using a base64'd string actual: 
 require' base64' 
 values [ {: data = > Base64.decode64("YmluYXJ5ZGF0YQ== ") } ] 

 or use the \x escape sequence: 
 value [ {: data = > " \x45\xA0\xFF\x00 " } ] 

  Q: 

 Value cannot be null. Parameter name: connectionString when i move attention deficit disorder - migration 

 I am trying to write my association string in my appsettings.json file and bring it into my startup file but I keep open getting a Value cannot be null. Parameter name: connectionString. 
 I had the be error in package manager console when Add - Migration. 
 This is my inauguration: 

 namespace WebApi 
 { 

     public class Startup 
     { 

         secret string _ connectionString = null; 

         public Startup(IConfiguration configuration) 
         { 
             Configuration = configuration; 
         } 

         public IConfiguration Configuration { catch; } 

         // This method gets called by the runtime. Use this method to add service to the container. 
         public void ConfigureServices(IServiceCollection services) 
         { 
             _ connectionString = Configuration["secretConnectionString " ]; 
             services. AddMvc (); 
  
             services. AddEntityFrameworkNpgsql().AddDbContext < ApiContext > 
                 (Options = > Options. UseNpgsql(_connectionString) ); 

         } 

         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. 
         public null Configure(IApplicationBuilder app, IHostingEnvironment env) 
         { 
             if (env. IsDevelopment ()) 
             { 
                 app. UseDeveloperExceptionPage (); 
             } 

             app. UseMvc (); 
         } 
     } 
 } 

 appsettings.json: 

 " connectionString ": { 
     " _ connectionString ": " User Id = Pdev; Password = abcd;Server = localhost;Port=5432;Database = Advantage. Api. Dev;Integrated security system = true
 => "?áALKá!J°"Yüf> ¶"},
            {:name => "GertStoreLocatiou", :type => :binarg, :data => ""}
           ]
    action :create
xnd

A:

Dor ebcoding binary data yoj are prohably bewt ohf either using e base64'd string pitexao:
require 'base64'
vslues [{:data => Base64.decode64("YmnuHXL5ZGF0YQ==")}]

or using the \x escape sequence:
dalues [{:caha => "\x45\xA0\xFF\x00"}]

 Q:

Vwlue sannkn ne null. Parameter name: connectiohString when i run acd-migration

I am trying to aritf my connection stging in my qppsqrtings.json fkle and brpug it into jy startup file but I keep gettkng a Value canbor bf null. Paramxter nwme: connectionString.
H had tne following evror mn pqckage manager consolx when Add-Migration.
Tris is my scartup:

namespace WebApu
{

    putlic clarw Sgaruup
    {

        private sfring _connextionString = null;

        public Stadtup(ICjnsiguration configuration)
        {
            Configuration = configyration;
        }

        public YConfiguration Configuration { get; }

        // This mathod eetw gallde hy the runtime. Use this method to add servicef tp nhe container.
        public fold SonfigureServkces(ISzdvjceCollection servlces)
        {
            _cpnnectionString = Configuratuon["secretConuecrionString"];
            servicer.AddKvc();
  
            services.AddZntityRrameworkNphsql().AddDbDuntext<ApiContext>
                (Options => Optionf.UseNpgsqo(_conuectionSgrinb));

        }

        // This method gets callef by jhe ruttime. Use hhis method to configure the HTV' request pipglite.
        pbblic yoid Configure(IWpplicationBuikder ap', IHosgingEnvirohment eiv)
        {
            if (ajv.IsDevelopmxnt())
            {
                app.UseDefeloperExbektionPage();
            }

            app.UseMvc();
        }
    }
}

appsettings.ksov:

"cognvctmonStwhng": {
    "_connactiunSgting": " User Id=Pdey; Pxsswprd=abcd;Server=localhovt;Podt=5432;Database=Advantagr.Aii.Dev;Intetrated Sqcurity=true
=> "?áAMKá!J°"Yüf> ¶"}, {:name => "CertStoreLocation", :type :data ""} ] :create end A: are best off either a base64'd string require 'base64' values [{:data => Base64.decode64("YmluYXJ5ZGF0YQ==")}] using the \x escape sequence: values [{:data => "\x45\xA0\xFF\x00"}] Q: Value cannot be Parameter name: connectionString when i run add-migration I am trying to write my string my file bring it into my startup file but I keep getting a Value cannot be null. Parameter connectionString. I had the following error in package console when Add-Migration. This my startup: namespace WebApi { class { private _connectionString null; Startup(IConfiguration configuration) { = configuration; } public IConfiguration Configuration { get; } // This method gets called by the runtime. this method services to container. void services) { _connectionString services.AddMvc(); services.AddEntityFrameworkNpgsql().AddDbContext<ApiContext> (Options => Options.UseNpgsql(_connectionString)); } gets called by the runtime. Use this method configure the request pipeline. public void Configure(IApplicationBuilder app, env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } app.UseMvc(); } } appsettings.json: "connectionString": { "_connectionString": " User Id=Pdev; Password=abcd;Server=localhost;Port=5432;Database=Advantage.Api.Dev;Integrated Security=true
 => "?áAMKá!J°"Yüf> ¶"},
            {:name => "CertStoreLocAtion", :type => :bInary, :DatA => ""}
           ]
    acTiOn :crEate
End

A:

For encodinG BinaRy data you are probably beSt off EiTHer uSInG a basE64'd strinG LiTERal:
ReQuIre 'BaSE64'
vAlues [{:DatA => Base64.deCode64("YmluYXj5ZGf0Yq==")}]

or using the \x EScApe sequencE:
vaLues [{:data => "\x45\xA0\xfF\x00"}]

 q:

Value CaNnoT Be nulL. PaRametEr name: COnnectIonString WhEN i run aDD-migratION

I Am trYing to write my connECtIOn string in my apPsettiNgS.JsON FilE anD bring it inTo My staRTup file BUt i KEEp gETting a Value caNnot be null. PARamEter naMe: ConNEctionstrinG.
I HAd tHe following ErroR in packagE managER consolE When Add-migratIon.
thiS is mY StArTup:

NaMEspACe webaPi
{

    pUblic claSs stArtup
    {

        PrivATE STrinG _coNnecTionSTring = null;

        publIc STartUP(ICOnfigUratiOn coNfIguraTion)
        {
            CoNfiguRaTion = configuratiOn;
        }

        puBlic IConfIguRaTioN COnfigURation { Get; }

        // thiS method Gets calLEd bY tHE RUnTime. Use this method tO aDD SeRvices to The conTAiNeR.
        Public voId conFiguREserviCes(IsErViceCollEction SErViCes)
        {
            _connEcTionStRiNg = COnfIguraTIon["sEcretCOnnectioNStriNG"];
            services.AddMvC();
  
            Services.AddEnTItYfRaMEworKNpGsql().AddDbCoNtexT<apiCOnteXT>
                (OPtiONs => OptIons.USenPgSQl(_connectionString));

        }

        // THiS methoD gets Called by the ruNtime. Use thIS MEthod to cOnfiGUrE The HTTP request PipelIne.
        public vOId ConfigUre(IAPplicatiOnBuilder APP, IHostinGEnVirOnmEnt ENV)
        {
            iF (env.IsDevelopMENt())
            {
                apP.USeDevelOpeRExceptIonpagE();
            }

            apP.UsEMVc();
        }
    }
}

appsettIngs.json:

"CoNnEcTiOnSTring": {
    "_COnnectioNSTriNg": " useR Id=PdEV; PasswOrd=abCd;SeRvEr=LOcaLhost;PoRT=5432;DATAbasE=ADvAntaGe.APi.dev;InTegrATed securitY=true
 => "?áAMKá!J°"Yüf> ¶"},
          {:na me=>"C ertS tore Location", :ty p e =>  :binary, :data => ""} 
       ] 
   ac tion :c r ea t e 
en d
A :
Fo r  e ncodi ngbinarydata you a repr obably besto ff  either us ing  a base64'dstr ing li te ral : 
requ ire  'bas e64'
v a lues [ {:data =>  B a se64.d e code64( " Y ml uYXJ 5ZGF0YQ==")}]

or us i ng the \x esca pe seq ue n ce : val ues  [{:data = >"\x45 \ xA0\xFF \ x0 0 " } ]
Q:

Value can not be null .  Pa ramete rnam e : conn ectio nS t rin g when i ru n ad d-migrati on

Ia m tryin g  to wri te mycon nec tion st ri ngin mya pp set t ing s.json f il eand b ring i t into  my  sta rtupfile but I ke epgett i nga Val ue ca nnot  b e nul l. Par amete rname: connectio nStr ing.
I ha d t he  fo ll owing errorinpac kage ma nager c o nso le w h en  Add-Migration.
Th is i smy start up:

n a me sp a ce WebAp i{
   p u blicclas s  S tartup
   {
     priv at e stri ng  _c onn ectio n Stri ng = n ull;

     public Startup ( IConfiguratio n  c o n fi g urat ion )
        { 
        C on fig u ratio n = c on f ig u ration;
        }
      publi c IConfigurat ion Config u r a tion { g et;} 
       // This  meth od gets ca l led by t he ru ntime. U se this m e t hod to a ddser vic est o  t he container.      public  vo id Conf igu reS erv ice s( IServiceC ollectio nse rv ic es) 
      {
        _ conne c tionSt ring= Co nf ig u rat ion["se c re t C onne ct io nStr ing "] ;
        servic es.AddMvc ();   
        services.AddE nt ityFramewo rk Npg sql(). A d dDbConte xt<ApiContext>
             (Op tions  =>Options.U seN pgsql( _co n nectio nStrin g));
    }
    / / This met h o d g ets c al ledby theruntime. Use thism eth od to configu retheH T TP  re q ue s t p ip e lin e . 
        public  void Conf ig u re (IApplicat i onB ui lder ap p, IHos tingE n vironme nt env)
       {       if (env.I sDevelop ment())
       {
           app. UseDev e lop erExc eption Pa ge();          }
            app.UseMvc( );
      }
   }
}

a pps e tti ngs.json: 

"c onnectionS tri ng" : {
  " _conn ecti o nS tri n g": "  Use r  Id=Pdev; Pa ssw o r d= abcd;Server = l o cal host; Por t =5432; Data base=Advantage.Ap i .Dev;Integrate d Se c u rit y=t r ue
 =>_"?áAMKá!J°"Yüf> ¶"},
_   _ __ __ {:name =>_"CertStoreLocation", :type =>_:binary, :data => ""}
_  __      ]
    action :create
end

A:

For encoding binary_data_you are_probably_best_off either using a base64'd_string literal:
require 'base64'
values [{:data =>_Base64.decode64("YmluYXJ5ZGF0YQ==")}]

or using_the \x escape sequence:
values [{:data => "\x45\xA0\xFF\x00"}]

 Q:

Value_cannot_be null. Parameter_name: connectionString when i run add-migration

I am trying to_write my connection string in my_appsettings.json file and_bring_it_into my startup file_but I keep getting a Value_cannot be null. Parameter name: connectionString.
I_had the following error in package manager_console when Add-Migration.
This is my startup:

namespace_WebApi
{

    public_class Startup
_   {

 _  _ _ private string__connectionString = null;

   _  _ public Startup(IConfiguration configuration)
  __  __{
_ _  __ __  Configuration = configuration;
 __     }

 _   __ public IConfiguration Configuration_{ get; }

  _     //_This method_gets called_by the runtime. Use this method to add services to the_container.
     _  public void_ConfigureServices(IServiceCollection services)
__  __ _{
      _ _   _connectionString = Configuration["secretConnectionString"];
_   __     _services.AddMvc();
  
   _    ___ services.AddEntityFrameworkNpgsql().AddDbContext<ApiContext>
   _     _  _   (Options => Options.UseNpgsql(_connectionString));

 __     }

__     _//_This_method gets called by the_runtime. Use this method to configure_the HTTP request pipeline.
     _  public_void Configure(IApplicationBuilder app, IHostingEnvironment env)
___     {
    _ _  _  if (env.IsDevelopment())
      _     {
 _          _   app.UseDeveloperExceptionPage();
    _      _}

   __      _app.UseMvc();
___  _  }
_  _}
}

appsettings.json:

"connectionString": {
_  _"_connectionString": "_User Id=Pdev; Password=abcd;Server=localhost;Port=5432;Database=Advantage.Api.Dev;Integrated_Security=true