Create a net core console application

Create A Net Core Console Application

In Visual Studio 2017 go to .NET Core Then Console Application and give it a name like “MyCoreConsoleApp” Next, add a JSON configuration file with the name of appsettings.json as the first source of configuration keys. Be sure the property “Copy to Output Directory” is set to “Copy Always” for the newly added JSON file. This will ensure that the file is published with Replace the contents of the appsettings.json file with the following content: `"Message":"Hello from appsettings.json"` This will set the property “Message” to the value of “Hello……” ### Create a .net core console application This command generates the basic structure of an application and has just

enough code to run the application but nothing else. Let’s look at the structure of the project file: As you can tell there is basically a reference to the `Target Framework` and that is about it. No other dependencies have been added. Taking a look at `Program.cs` file we’ll see that the only thing the application can do at this point is print out `"Hello World!"` to the

Its possible to Pass arguments to a console application when running it from a command line. If we alter the code slightly to use any arguments passed in. The Main method is the entry point of a C# Application, typically when an application is started the Main method is the first method that is invoked. There can only be one entry point in a C# Program. The `Main` method can be declared with or without a `string[]` parameter that contains command-line arguments. Parameters are read as zero-indexed command-line arguments. Unlike C

and C++, the name of the program is not treated as the first command-line argument in the `args` array, but it is the first element of the `GetCommandLineArgs()` We can now create application stubs with the command `dotnet build` and then execute the FizzBuzz.dll in` bin/Debug//netcoreapp3.1/` or we can now execute the application using the command ` dotnet FizzBuzz "Gary" ` and we should see the following result: This works great if you want to pass in additional arguments to a Console application, for instance, we could configure our simple

Console application to run as a Linux daemon, by creating what is commonly called systemd user The above process is one way to pass configuration or data that the application may require to run. For instance, you may want to pass in a Url string you want the application to run or any other crucial information that may be needed.

** This article is old and is about .Net Core 1.0. Updated the title to make it clear and not mislead anyone. ** .Net Core 1.0 and ASP.NET Core 1.0 have been released more than three months ago and a lot has been written/spoken on how to do stuff with ASP.NET Core. But what about .NET Core Console Applications? Don’t they deserve the same kind of love? I believe they do. Although most of .Net developers focus on ASP.NET, UWP or Xamarin, there are still a lot of

developers who use/implement console applications to be used as scheduled task or as simple applications that are needed now and then to do I felt the “lack of love” for .NET Core console applications when about three months ago I was assigned the task of implementing Dept’s gravatar server. One of the requirements of the “gravatar server” was to have a simple console app to download images from the Dept’s own Workplace (back then it was still in beta phase and was known by the name of

Facebook @ Work) every night. These images would then be served by a web application. As geeks and technology addicts as we are at Dept, we felt the need to implement all this in ASP.NET Core and .NET Core. While ASP.NET Core has built-in support for dependency injection, logging and environment configurations, you don’t have this by default on regular .NET Core console apps. Of course you can live and work without these features but I felt this was not the way I wanted to implement the

console app and I went on searching for documentation, examples and/or tips on how to have these features on console apps. After a few hours of searching for different terms/keywords, most of the results that I got referred to ASP.NET core RC versions or to ASP.NET 5 (the pre ASP.NET core RC1 name). Luckily, after a few hours I came across this StackOverflow question and answer that saved my life! I have to give credit to the user that replied to that question , it helped me

a lot! How I did it? continue reading to find out!


Example Creating A Console Application Using Net Core Cli

Running A Net Core Console Application As A Windows Service

September 2019 update: This subject has been an ever-moving feast since this article was first published in the early days of .Net Core, but there are now four main approaches to this that are each discussed below. Building an application to run as a Windows Service was pretty straightforward with the .Net Framework. You either implemented ServiceBase in a console application or used a helper library like TopShelf. Both approaches provided a programming model that covered the full life cycle of the service, from initial registration to running, pausing and stopping. When .Net Core was first released it didnât have any direct support for creating Windows Services in .Net Core. The ServiceBase class was left out of the initial implementation, presumably because it contained too much Windows implementation detail for what was supposed to be a cross-platform framework.

Since then several different approaches to creating a service have emerged:


Build Pipeline Build The Net Core Console App

Implement Ihost In Net Core Console Applications

The IHost interface and the HostBuilder class provide similar experience to the respective IWebHost and WebHostBuilder .net core web developers are IHost and HostBuilder are components of a new feature set of .NET Core 2.1, to simplify the creation of console based services by providing a pattern for adding cross-cutting concerns such as dependency injection, configuration and logging. You need to bear in mind that applications which will implement the IHost require marking the Main method as async. public static async Task Main(string[] args) await host.RunAsync(); If you’ve generated your Console Application using the

dotnet new console you may need to update your project file to include latest more package references dotnet add package Microsoft.Extensions.Configuration.CommandLine dotnet add package Microsoft.Extensions.Configuration.EnvironmentVariables dotnet add package Microsoft.Extensions.Configuration.Json dotnet add package Microsoft.Extensions.Hosting dotnet add package Microsoft.Extensions.Hosting.Abstractions dotnet add package Microsoft.Extensions.Logging dotnet add package Microsoft.Extensions.Logging.Configuration dotnet add package Microsoft.Extensions.Logging.Console HostBuilder does not provide an extension method enabling the use of a StartUp * ConfigureAppConfiguration – Application Configuration * ConfigureContainer – Configure the instantiated dependency injection container * ConfigureLogging – Configure Logging * ConfigureServices – Adds services to the Dependency Injection container The RunConsoleAsync

will start services and wait on an exit signal in the

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