Generics in C# class in constructor?

Question

I have a C# class with a constructor. The constructor currently requires a logger<myObject>. The code looks like this:

public class MyClass
{
   private ILogger<MyObject> _logger;

   public MyClass(ILogger<MyOjbect> logger)
   {
     _logger = logger; 
   }
}

I would like ILogger to take a generic, that way I can instantiate an instance of MyClass anywhere I want and pass in any type of ILogger<T> that I want, however, when I change <MyObject> to <T> I'm getting:

The type or namespace 'T' cannot be found. Are you missing a directive or assembly reference?

Meaning, I'd like the code to look like this:

public class MyClass
    {
       private ILogger<T> _logger;
    
       public MyClass(ILogger<T> logger)
       {
         _logger = logger; 
       }
    }

and to create it:

var myClass = new MyClass(ILogger<Something> logger);

It's always best to read the docs when learning a new part of the language. Microsoft docs these days are pretty good. — Kirk Woll
– Kirk Woll, Commented Mar 21, 2022 at 22:19
You can never just use made up types. You always have to declare them. Where have you declared T? — Enigmativity
– Enigmativity, Commented Mar 21, 2022 at 22:44
When you post questions about generics, make sure that any non code mentions of <Something> in angle brackets are surrounded by backticks ` otherwise they get interpreted as html tags and disappear, making for quite confusing reading — Caius Jard
– Caius Jard, Commented Mar 22, 2022 at 6:11

pm100 · Accepted Answer · 2022-03-21 21:49:53Z

6

You need to do this

public class MyClass<T>
--------------------^^^
{
   private ILogger<T> _logger;

   public MyClass(ILogger<T> logger)
   {
     _logger = logger; 
   }
}

answered Mar 21, 2022 at 21:49

pm100

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1 Comment

Jeremy Lakeman Over a year ago

And maybe ILogger<MyClass<T>>

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