What are AddSingleton, AddScoped and Add Transient C# Asp.net Core?

There are three ways to register dependencies in Startup.cs. ie. AddSingleton, AddScoped and AddTransient.

Add Singleton

When we register a type as a singleton, only one instance is available throughout the process. application and for every request.

It is similar to having a static object.

The instance is created for the first request and the same is available throughout the application and every subsequent request.

public void ConfigureServices(IServiceCollection services){
   services.AddSingleton<ILog,Logger>()
}

Add Scoped

When we register a type as Scoped, an instance is used throughout Apply upon request. When a new request comes, New instance created. Adding a scope specifies that one object is available per object ask.

public void ConfigureServices(IServiceCollection services){
   services.AddScoped<ILog,Logger>()
}

Add transient

When we register a type as transient, a new instance will be created every time. Transient Create new instances for each service/controller and for each request per user.

public void ConfigureServices(IServiceCollection services){
   services.AddTransient<ILog,Logger>()
}

Parameters	Add Singleton	Add Scoped	Add Transient
Instance	per request/every

user.One per request. different every time. Disposed Application Close Request Ended Request Ended Used in When a singleton Implementation is required. has different behavior of each user. Light weight, behavior of each user. Lightweight and Stateless service.

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