class library creation

[ghlouwho]

P 162 #1. Needs better explanation, this failed "dotnet new classlib CalculatorLib", Found this... https://docs.microsoft.com/en-us/dotnet/core/tutorials/library-with-visual-studio-code?pivots=dotnet-6-0, and then changed to "dotnet new classlib -o CalculatorLib"

[ghlouwho]

It is also confusing as to what folder we should be working in. Are we creating the class library in the Instrumenting folder, or a new CalculatorLib folder. This is not written for people new to this.

[markjprice]

I instruct readers to follow the detailed steps in Chapter 1 whenever they create a new project. They are the same steps regardless of if you are creating a console app or class library (except the name of the template to use of course).

1. Create a folder for the project named CalculatorLib.
2. Change to that folder.
3. Create the project using dotnet new [templatename] i.e. dotnet new classlib.

But I agree it'd be worth repeating the detailed steps for this exercise since the change from console to classlib could make a reader not realize it is the same process as creating a console app. I also plan to explain the use of -o flag in Chapter 1 for readers who might prefer that way of creating a project.

I have added an erratum item: https://github.com/markjprice/cs10dotnet6/blob/main/errata.md#page-162---creating-a-class-library-that-needs-testing