In bearloga/dotnet: 'knitr' Engine for C# and F# Languages and Wrapper for 'dotnet' CLI

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

First, register the dotnet knitr engine:

dotnet::register_engine()

For single-chunk programs, new .NET app is created either in a temporary directory or in the chunk's cache (if cache chunk option is set to TRUE). For multi-chunk programs, we will need to manage the app directory ourselves and keep it consistent between the chunks.

app_name <- "multiChunkProgram"
app_dir <- file.path(tempdir(), app_name)

Also, until the app is ready to be run we will need to specify run_app = FALSE in each chunk's engine.opts:

```{dotnet MyClass, engine.opts = list(file = 'MyClass', name = app_name, dir = app_dir, run_app = FALSE)}
class MyClass {
}
```

Once we're ready to define the Main() method, we conclude with:

```{dotnet Program, engine.opts = list(name = app_name, dir = app_dir)}
class Program {
  static void Main(string[] args) {
    // Code to be executed
  }
}
```

Notice the missing file and run_app in engine.opts. That's because file is "Program" and run_app = TRUE by default, since single-chunk programs are the default.

Example

```{dotnet author, engine.opts = list(file = 'Author', name = app_name, dir = app_dir, run_app = FALSE)} class Author { public string name; public int dob; // date of birth public int dod; // date of death public Author(string name, int dob, int dod) { this.name = name; this.dob = dob; this.dod = dod; } public int age { get { return dod - dob; } } }

```{dotnet book, engine.opts = list(file = 'Book', name = app_name, dir = app_dir, run_app = FALSE)}
class Book {
  public string title;
  public int year;
  public Author author;
  public Book(string title, int year, Author author) {
    this.title = title;
    this.year = year;
    this.author = author;
  }
}

```{dotnet program, engine.opts = list(file = 'Program', name = app_name, dir = app_dir, run_app = TRUE)} using System;

class Program { static void Main(string[] args) { Author kv = new Author("Kurt Vonnegut Jr.", 1922, 2007); Book cc = new Book("Cat's Cradle", 1963, kv); Console.WriteLine("'{0}' ({1}) by {2}", cc.title, cc.year, cc.author.name); Console.WriteLine("{0} was {1} or so when he died in {2}", kv.name, kv.age, kv.dob); } } ```

bearloga/dotnet documentation built on April 5, 2022, 5:33 p.m.