Get Connection String through Dependency Injection

Question

I am developing a blazor application. I want to have connection string and some other key in a class as service.

For that I have created an interface

interface IDbConnector
{
    string ConnectionString { get; set; }

    bool SomeKey { get; set; }
}

and in my class I want to have something like that

using Microsoft.Extensions.Configuration;
    public class DbConnector : IDbConnector
    {
        private IConfiguration Configuration { get; set; }

        public DbConnector(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        public string ConnectionString = Configuration.GetConnectionString();

        public bool SomeKey = Configuration.GetSection("xyz");
    }

I can register it as a service with

services.AddScoped<IDbConnector, DbConnector>();

But inside DbConnector class it says

A fiels initializer can not refrence the non static field ,method or property DbConnector.Configuration

Pardon for my coding pattern as I am new to DI concept. Please suggest if there is another and better way to do this.

You can do ConnectionString = configuration.GetConnectionString(); in your constructor. — JohanP
– JohanP, Commented Jun 16, 2019 at 6:33
@JohanP , Error: ConnectionString does not exist in current context — Saurabh
– Saurabh, Commented Jun 16, 2019 at 6:36
You need to declare it. public string ConnectionString {get;set;} — JohanP
– JohanP, Commented Jun 16, 2019 at 6:39
Possible duplicate of Configure connection string from controller (ASP.NET Core MVC 2.1) — user4864425
– user4864425, Commented Jun 16, 2019 at 8:11

Avin Kavish · Accepted Answer · 2019-06-16 12:40:13Z

3

You've made a syntax error, these should be expression bodied property accessors. = to =>

public string ConnectionString => Configuration.GetConnectionString();

public bool SomeKey => Configuration.GetSection("xyz");

Instead you've tried to initialise them as fields. Fields initialise pre-constructor, therefore cannot access the configuration.

answered Jun 16, 2019 at 12:40

Avin Kavish

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Comments

behzad sayyarpour · Accepted Answer · 2019-06-16 12:31:49Z

-1

      services.AddConfiguration()  // enable Configuration Services

       var config = new WeblogConfiguration();
       Configuration.Bind("Weblog", config);      //  <--- This
       services.AddSingleton(config);

answered Jun 16, 2019 at 12:31

behzad sayyarpour

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1 Comment

Eric Leschinski Over a year ago

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