.NET Core is a new open-source and cross-platform framework for building modern cloud-based applications. Serverless is a new deployment model that is gaining popularity for its ability to provide on-demand, scalable, and pay-per-use resources. In this article, we will show you how to quickly build a .NET Core database application using the Serverless framework.
First, we need to install the Serverless framework. The Serverless framework is available as a Node.js module, so we need to first install Node.js. We can download the Node.js installer from the official website (https://nodejs.org/en/). Once Node.js is installed, we can use the npm command to install the Serverless framework.
$ npm install -g serverless
Next, we need to create a new directory for our project. We will name our project "MyServerlessApp". In this directory, we will create a file named "serverless.yml" which will contain our Serverless configuration.
serverless.yml
service: my-serverless-app
provider:
name: aws
runtime: dotnetcore2.1
functions:
hello:
handler: HelloWorld::HelloWorld.Handler
events:
- http:
path: /
method: get
In the "serverless.yml" file, we have defined a "hello" function that will be invoked when an HTTP GET request is made to the "/" path. The "HelloWorld::HelloWorld.Handler" specifies the .NET class and method that will be invoked when the function is invoked.
Next, we need to create the "HelloWorld" class and "Handler" method. We will create a new file named "HelloWorld.cs" in the "MyServerlessApp" directory and add the following code.
using System.Threading.Tasks;
public class HelloWorld
{
public static async Task Handler()
{
return await Task.FromResult("Hello, World!");
}
}
The "HelloWorld" class contains a single "Handler" method which returns a string message.
Now that our code is ready, we can deploy our application to AWS Lambda using the Serverless framework. Before we can deploy our application, we need to create an AWS account and configure our AWS credentials. We can follow the instructions in the Serverless documentation (https://serverless.com/framework/docs/providers/aws/guide/credentials/) to create an AWS account and configure our credentials.
Once our AWS credentials are configured, we can deploy our application using the "serverless deploy" command.
$ serverless deploy
After the deployment is complete, we can invoke our "hello" function using the "serverless invoke" command.
$ serverless invoke -f hello
{"message":"Hello, World!"}
We can also invoke our function using an HTTP GET request. We just need to make a GET request to the URL that is returned when we run the "serverless deploy" command.
https://XXXXXXXXXX.execute-api.us-east-1.amazonaws.com/dev/hello
{"message":"Hello, World!"}
In this article, we have shown you how to quickly build a .NET Core database application using the Serverless framework. The Serverless framework makes it easy to deploy and manage cloud-based applications.
