Design Patterns on InternetException

Integrating my AI assistant with StartPage

Fri, 20 Mar 2026 21:09:48 +0100

Today I was fixing an issue with my assistant having a hard time accessing web search . I fixed that but I was not entirelly satisfied with the result. Browsh is great for that used but I am using StartPage on my PC and on my phone. Ability to see similar or even the same web search result for me and my assistant would be great.

How hard it can be to actually fetch the result od search via CLI? Actually it is not that hard. I was able to figurę it out though it requires very specific set od parameters, headers being sent to very specific address.

Pattern matching

Mon, 24 Oct 2022 14:50:08 +0200

Pattern matching is used for:

testing expression to check if some value have certain characteristics
safer compare because ‘==’ and ‘!=’ can be overloaded

Examples:

a is int number

sequence is IList<T> list

switch statement:

command switch
{
 Operation.SystemTest => RunDiagnostics(),
 Operation.Start => StartSystem(),
 Operation.Stop => StopSystem(),
 Operation.Reset => ResetToReady(),
 _ => throw new ArgumentException("Invalid enum value for command", nameof(command)),
};

switch with ranges:

tempInFahrenheit switch
{
 (> 32) and (< 212) => "liquid",
 < 32 => "solid",
 > 212 => "gas",
 32 => "solid/liquid transition",
 212 => "liquid / gas transition",
};

collection pattern matching:

array is [1,1,2,3,5,8, ..]

Further read:

https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/functional/pattern-matching

Asynchronous programming in .NET

Wed, 19 Oct 2022 09:52:30 +0200

Asynchronous programming patterns in .NET:

Asynchronous Programming Model (BeginOperation/EndOperation)
Event-based Asynchronous Pattern (invoke event with result from async job)
Task-based Asynchronous Pattern (Task<>)

Ways of achieving asynchronous code in .NET

async, await
Task class API (Run, WhenAll, WhenAny, etc.)
ThreadPool.QueueUserWorkItem(ThreadProc);

Further read:

async/await in .NET

https://learn.microsoft.com/en-us/dotnet/standard/asynchronous-programming-patterns/

IDisposable interface pattern

Tue, 18 Oct 2022 14:16:21 +0200

Example implementation of IDisposable

public class MyResource : IDisposable
{
 public MyResource(IntPtr handle)
 {
 this.handle = handle;
 }

 public void Dispose()
 {
 Dispose(disposing: true);
 GC.SuppressFinalize(this);
 }

 protected virtual void Dispose(bool disposing)
 {
 if(!this.disposed)
 {
 if(disposing)
 {
 component.Dispose();
 }

 CloseHandle(handle);
 handle = IntPtr.Zero;
 disposed = true;
 }
 }

 ~MyResource()
 {
 Dispose(disposing: false);
 }
}

MyResource object have pointer which is unmanaged. This is why this class should implement IDisposable interface. Implementation should be correct according to recommended pattern (see below for documentation).

There a re few points to highlight here:

Detecting software keyboard events in Xamarin Android

Fri, 03 Feb 2017 23:31:00 +0100

Introduction

It is quite strange that you can’t easily detect if software keyboard is visible or not on Android. Because of that, it is also complicated thing to do in Xamarin.

Xamarin Android Services Pattern on GPS example

Mon, 30 Jan 2017 04:17:00 +0100

Introduction

In Xamarin if you want to use many Android native service/mechanism you have to implement it in Activity class. Or at least that is how Xamarin documentation wants you to do it.

Xamarin Master-Detail Page

Sun, 24 Apr 2016 07:41:00 +0200

This article as previous ones (Frame With Padding , Frame Outline Problem , Inheritance from Implicit Styles ) also will be about Xamarin. This time we will inspect Master-Detail page control/mechanism. You can find official documentation for this control here . Quick spoiler: I never used this in any production application. Why? I will explain. Whole article will be to explain why this is just not worth your time. In this and subsequent articles I will introduce much better solution.