c# - Dependency injection, inject with parameters

Question

I'm using vNext implementation of DI. How to pass parameters to constructor? For example, i have class:

public class RedisCacheProvider : ICacheProvider
{
    private readonly string _connectionString;

    public RedisCacheProvider(string connectionString)
    {
        _connectionString = connectionString;
    }
    //interface methods implementation...
}

And service register:

services.AddSingleton<ICacheProvider, RedisCacheProvider>();

How to pass parameter to constructor of RedisCacheProvider class? For example for Autofac:

builder.RegisterType<RedisCacheProvider>()
       .As<ICacheProvider>()
       .WithParameter("connectionString", "myPrettyLocalhost:6379");

Answer 1

You can either provide a delegate to manually instantiate your cache provider or directly provide an instance:

services.AddSingleton<ICacheProvider>(provider => new RedisCacheProvider("myPrettyLocalhost:6379"));

services.AddSingleton<ICacheProvider>(new RedisCacheProvider("myPrettyLocalhost:6379"));

Please note that the container will not explicitly dispose of manually instantiated types, even if they implement IDisposable. See the ASP.NET Core doc about Disposal of Services for more info.