ASP.NET 5 Console Application (package) - How to create DBContext from connection string?

ASP.NET 5 Console Application (package) - How to create DBContext from connection string?

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ASP.NET 5 Console Application (package) - How to create DBContext from connection string?
Tag : chash , By : user187383
Date : November 26 2020, 09:01 AM

I wish this helpful for you DbContext doesn't have this constructor anymore. You can specify the connection string in OnConfiguring method overload:
public class BloggingContext : DbContext
    public DbSet<Blog> Blogs { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)


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Get connection string in console application

Tag : .net , By : Edo
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Your connection string is called DBEntities
Use this line in your code instead:
String connString = ConfigurationManager.ConnectionStrings["DBEntities"].ConnectionString;

How to pass connection string to DBContext in Onion architecture application?

Tag : asp.net-mvc , By : robinator
Date : March 29 2020, 07:55 AM
will help you
How do I pass this connection string to Repository or DBContext so that it can be passed to DBContext constructor?
string conStr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

container.Register<DBContext>(() => new DBContext(conStr));

Create a console application that opens a TCP/IP connection and print the inputted string - in C++, C# or Java

Tag : java , By : cmhudson
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further This tutorial has everything you need to know, and in fact very closely matches your specificationlet:
    String hostName = args [0];
    int portNumber = Integer.parseInt(args [1]);
    String transmit = args [2];

    try (
        Socket echoSocket = new Socket(hostName, portNumber);
        PrintWriter out = new PrintWriter(echoSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
        BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in))
            String response = in.readLine ();
            while (response != null) {
                System.out.println("echo: " + response);
                response = in.readLine ();

Can't run EF migration where DbContext connection string is set at runtime and separate project from application

Tag : chash , By : Stephen Dewar
Date : March 29 2020, 07:55 AM
wish helps you Okay, so after much looking, you can't do this by default. No tooling for class libraries since January at all, which seems horrible to me. And no tooling as the link I posted mentions for a .NET CORE class library targeted at 461 using EF6, because EF6 tools do not recognize project.json dependency format.
However, blessed be, a gentleman by the name of Mohammad Rahhal created such a library to accomplish this: https://github.com/mrahhal/Migrator.EF6/blob/master/README.md
  "version": "1.0.0-*",

  "dependencies": {
    "EntityFramework": "6.1.3",
    "Migrator.EF6.Tools": "1.0.5"

  "frameworks": {
    "net461": {}

  "buildOptions": {
    "emitEntryPoint": true

  "tools": {
    "Migrator.EF6.Tools": {
      "imports": "portable-net45+win8+dnxcore50",
      "version": "1.0.5"
public class Program
    public static void Main(string[] args)

What's a good pattern to create DbContext when dynamic data determines connection string

Tag : chash , By : fstender
Date : March 29 2020, 07:55 AM
To fix the issue you can do You can move your logic for creating ClientContext into another responsible class (according to SOLID principles), something like DbContextFactory and store there created DbContext's for each client. Like this:
public class DbContextFactory
    private readonly IConfiguration _configuration;
    private readonly Dictionary<string, ClientDbContext> _clientContexts = new Dictionary<string, ClientDbContext>();

    public DbContextFactory(IConfiguration configuration)
        _configuration = configuration;

    public ClientDbContext GetOrCreateClientContext(string clientNumber)
        // if you have context already created - return it
        if (_clientContexts.ContainsKey(clientNumber))
            return _clientContexts[clientNumber];

        var optionsBuilder = new DbContextOptionsBuilder<ClientDbContext>();
        var clientConnection = string.Format(_configuration.GetConnectionString("clientConnection"), clientNumber);

        var clientDbContext = new ClientDbContext(optionsBuilder.Options);
        _clientContexts[clientNumber] = clientDbContext;

        return clientDbContext;
public class Worker
    private readonly DbContextFactory _factory;

    public Worker(DbContextFactory factory)
        _factory = factory;

    public async Task DoWorkAsync()
        // group by ClientNumber
        var groupedCases = caseList.GroupBy(x => x.ClientNumber);

        foreach (var groupedCase in groupedCases)
            // For each client create context and repository
            var clientContext = _factory.GetOrCreateClientContext(groupedCase.Key);
            var clientRepository = new ClientRepository(clientContext);

            foreach (var @case in groupedCases)
                var updatedCase = // transform case here
                await clientRepository.CreateCases(updatedCase);
var factory = new DbContextFactory(yourConfiguration);
var worker = new Worker(factory);
await worker.DoWorkAsync();
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