在netcoreapp3.0控制台应用程序中，默认情况下会生成myprogram.exe（带扩展名exe）。 它是什么？

Question

I have the following simple project:

<Project Sdk="Microsoft.NET.Sdk">

 <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <LangVersion>8.0</LangVersion>
 </PropertyGroup>
 </Project>

In netcoreapp3.0:

When run 'dotnet build', I find a file myprogram.dll is generated with size 5k plus myprogram.exe is generated with size 239k

In netcoreapp2.2:

The myprogram.exe isn't generated.

I can run the program :

    dotnet myprogram.dll

Or

    myprogram.exe //it need .netcore be installed.

Why are the the two files: myprogram.exe and myprogram.dll is generated in netcoreapp3.0, but in netcoreapp2.2 only myprogram.dll is generated?

Answer 1

From https://devblogs.microsoft.com/dotnet/announcing-net-core-3-preview-1-and-open-sourcing-windows-desktop-frameworks/

NET Core applications are now built with executables. This is new for applications that use a globally installed version of .NET Core. Until now, only self-contained applications had executables. You can see executables produced in the following examples.

You can expect the same things with these executables as you would other native executables, such as:

• You can double click on the executable.
• You can launch the application from a command prompt without using the dotnet tool, using myconsole.exe, on Windows, and ./myconsole, on Linux and macOS, as you can see in the following examples.

So, it is just a more convenient way to use the program. You don't need to use a command line such as dotnet myapp.dll to start the application. You can run the exe.