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In this video, we'll use the .NET CLI on macOS to create our first console app project.
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Let's create a project using the .NET CLI.
0:00
Here we are at a terminal prompt on macOS.
0:03
We can verify the .NET Core is installed
by running the dotnet command.
0:06
This gives us some basic information
about our .NET Core installation
0:11
including the version number.
0:14
To create a project,
let's first create a new directory, and
0:16
then browse that directory.
0:20
From here,
0:24
we can run the dotnet new command to
create a new console app project.
0:25
If we list the files in our directory,
we can see that two files were created,
0:29
Program.cs and project.json.
0:33
We'll take a look at these
files in just a moment.
0:36
Before we can run our app, we need to
restore any dependencies our app might
0:39
have by running the dotnet
restore command.
0:43
If we list the files again, we'll see that
we now have a project.lock.json file.
0:47
This file, which needs to be
present before we can run our app
0:53
represents the complete
dependency graph for our app.
0:57
Now we can run our app using
the dotnet run command.
1:01
And here's the output from
our console app Hello World.
1:06
Let's review our project
files in Visual Studio Code,
1:10
the cross-platform open source
code editor from Microsoft.
1:13
I'll open our current directory and
code by running the command code.
1:17
Notice that when I open the program
.cs file, Code prompts me to install
1:23
the ms-vscode..csharp extension.
1:28
Out of the bo, Code doesn't provide any
special support for editing C# files.
1:33
But by installing this extension,
we'll have an editor experience
1:39
that's similar to what the full
version of Visual Studio provides.
1:43
I'll click show recommendations to
browse to the extensions panel,
1:46
then click Install on
the extension to install it.
1:51
Once it's installed, we can click
the Enable button to enable it.
1:55
We'll be prompted to restart Code.
2:00
And once it restarts,
we'll now see syntax highlighting and
2:02
reference counting on our class and
method.
2:06
Now that we have the C#
extension installed and
2:10
enabled, Code recognizes that we're
working on a .NET Core application.
2:13
And asks us if we'd like to add
the required assets to build and
2:17
debug our project.
2:21
I'll go ahead and click on yes.
2:23
With all that out of the way, let's take
a closer look at the Program.cs file.
2:25
Not much happening here,
this is just a regular old console app.
2:30
We've got a class named Program and
a public static method named Main
2:34
that writes to the console
the string literal, Hello World.
2:40
Let's look at the project.json file.
2:44
The project.json file is being
replaced with a CS project file.
2:46
So I'm not going to spend a lot of time
explaining the parts of this file, but
2:52
I do want to highlight some things.
2:55
The dependencies property list
the dependencies for our app.
2:58
Our app currently doesn't
have any dependencies.
3:01
But that will change in just a moment
when we convert our project to a web app.
3:04
Each dependency represents NuGet package
3:08
that needs to be restored before
the app can be built and ran.
3:11
Dependencies typically have
their own dependencies.
3:15
So this list doesn't represent the full
list of NuGet packages that your app
3:18
depends upon, but
rather just the top level dependencies.
3:22
The frameworks property list
the frameworks that we're targeting.
3:27
In this case, netcoreapp1.0,
which is .NET Core.
3:30
Overall the project.json file
becomes more complicated when
3:35
working with ASP.NET Core and VC web app.
3:40
After the break,
3:43
we'll see what it takes to convert our
console app project to a simple web app.
3:44
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