68 lines
2.7 KiB
ReStructuredText
68 lines
2.7 KiB
ReStructuredText
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Creating a Cross-Platform Console App with DNX
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==============================================
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By :ref:`Steve Smith <console-author>` | Originally Published: 28 April 2015
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Using the .NET Execution environment (DNX), it's very easy to run a simple console application.
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In this article:
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- `Creating a Console App`_
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- `Specifying Project Settings`_
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- `Running the App`_
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You can `view and download the source <https://github.com/aspnet/Docs/tree/master/samples/CreatingConsoleAppWithDNX>`_ from the project created in this article.
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Creating a Console App
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----------------------
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Before you begin, make sure you have successfully installed DNX on your system:
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- :doc:`Installing on Windows </getting-started/installing-on-windows>`
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- :doc:`Installing on Mac OS X </getting-started/installing-on-mac>`
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Open a console or terminal window in an empty working folder, where ``dnx`` is configured.
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Creating a console application is extremely straightforward. For this article, we're going to use the following C# class, which has just one line of executable code:
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.. literalinclude:: console/sample/Program.cs
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:linenos:
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:language: c#
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It really doesn't get any simpler than this. Create a file with these contents and save it as ``Program.cs`` in your current folder.
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Specifying Project Settings
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---------------------------
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Next, we need to provide the project settings DNX will use. Create a new ``project.json`` file in the same folder, and edit it to match the listing shown here:
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.. literalinclude:: console/sample/project.json
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:linenos:
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:language: javascript
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Save your changes.
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Running the App
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---------------
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At this point, we're ready to run the app. You can do this by simply entering ``dnx . run`` from the command prompt. You should see a result like this one:
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.. image:: console/_static/dnx-run.png
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..note:: ``dnx`` references several `environment variables <https://github.com/aspnet/Home/wiki/Environment-Variables>`_, such as ``DNX_TRACE``, that affect its behavior.
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Set the ``DNX_TRACE`` environment variable to 1, and run the application again. You should see a great deal more output:
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.. image:: console/_static/dnx-trace-run.png
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In this example, running on the Windows platform, the default behavior for DNX is to run on the full .NET Framework. You can switch to use the CoreCLR by running ``dnvm upgrade -r CoreCLR``. To return to using .NET CLR, run ``dnvm upgrade -r CLR``.
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You can see the app continues to run after switching to use CoreCLR:
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.. image:: console/_static/dnx-trace-coreclr-run.png
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Summary
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-------
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Creating and running your first console application on DNX is very simple, and only requires two files.
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.. _console-author:
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.. include:: /_authors/steve-smith.txt
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