.NET - May 2018

How to setup .NET Core 2 on Debian or Ubuntu Linux distro the easy way

Installing .NET Core on Linux the short way
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Many of you who had chance to work docker and .NET Cote on Linux will agree that easiest way of running .NET Core on Linux is to pull microsoft/aspnetcore:2.0 image from docker repository and just setup your app with .Dockerfile. You will be saved of the hassle of setting up the environment and .NET Core on on the Linux machine. But what if that is not an option? What if you really need for some reason to run your application on the specific host and not in the container? ... read more

Google Invisible reCAPTCHA and reCAPTCHA v2 in ASP.NET Core

ASP.NET Core implementation of Google reCAPTCHA and reCAPTCHA v2
 
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Recently I wrote and article about setting up and using Google reCAPTCHA v2, better known as "I'm not a robot" validation. If you were setting up reCAPTCHA v2, you probably noticed that there is an option for "Invisible reCAPTCHA" option. This type of validation, instead of asking user to interact with the UI in order to be identified as a human, does not require any direct interaction which can help building better user experience for your visitors ... read more

Redis health check in ASP.NET Core WebApi

Checking availability of distributed Redis cache instances in ASP.NET Core WebApi
 
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Even before popularity of micro service approach, for even monolithic applications you needed to have health-checks (Google Compute Engine) or health-probes (Microsoft Azure) for load balancing. Basically in load balancing scenario, these endpoints are used to tell load balancer whether instance can handle requests or not. Since handling of requests may consider several components, these endpoints either return 200 OK HTTP response or any other response like 500 Internal Server Error with optional payload message describing the issue and each component status. ... read more

Using strongly typed objects with IDistributedCache instead of byte arrays

An easy way to cache any object to distributed cache store using .NET Core
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Saving an object to distributed cache store in .NET Core requires your object to be serialized to byte array in order for SetAsync method on Microsoft.Extensions.Caching.Distributed.IDistributedCache interface implemented instance to save your object to the injected cache store instance. This means that what ever instance you have, you need to serialize it first to byte array. Similar, just reversed process applies for the process of reading an object from the distributed cache store. ... read more

Seeding data in Entity Framework Core from Visual Studio

Insert sample data from Visual Studio IDE with EF core
 
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Unlike Entity Framework 6, EF Core and whole .NET Core relies on dependency injection. For example, configuration is expected to be injected from the calling assembly instead of being available at any time. This is one of the reasons Migrations in Code First approach do not work out of the box for EF Core ... read more

SETNX with TTL in .NET using StackExchange.Redis

Set key if it does not exist in redis with expiry using StackExchange.Redis
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Recently I needed to set redis key if it is not present with specific expiry time to use it as some logical flag. I knew tat you can use SETNX command for this but did not have any info how to set the expiry time. After some time going through redis documentation and articles found online I found a SET method overload for the redis-cli. ... read more

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