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public static bool IsNullOrEmpty([NotNullWhen(false)] this string? str) => str?.Length is null or 0;

public static bool IsNullOrEmpty([NotNullWhen(false)] this string? str) => str is null or { Length: 0 };

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using Autofac;
using Autofac.Extensions.DependencyInjection;

using HanyCo.Infra;

using Library.Cqrs;
using Library.Mapping;

namespace BlazorApp;

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public class Monad<TValue>
{
    private readonly TValue? _value;

    public Monad(TValue? value)
        => this._value = value;

    public Monad<TResult?> AnyWay<TResult>(in Func<TValue?, TResult?> func)
        => new(func(this._value));

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using System.Linq.Expressions;

namespace Library.Data.Linq;

//! Reference: http://www.albahari.com/nutshell/predicatebuilder.aspx
public static class PredicateBuilder
{
    public static Expression<Func<T, bool>> True<T>() => f => true;
    public static Expression<Func<T, bool>> False<T>() => f => false;

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/// <summary>
    /// Resize the image to the specified width and height.
    /// </summary>
    /// <param name="image">The image to resize.</param>
    /// <param name="width">The width to resize to.</param>
    /// <param name="height">The height to resize to.</param>
    /// <returns>The resized image.</returns>
    public static Bitmap ResizeImage(Image image, int width, int height)
    {
        //a holder for the result

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<Project>
	<PropertyGroup>
		<TargetFramework>net6.0</TargetFramework>
		<LangVersion>preview</LangVersion>
		<EnablePreviewFeatures>true</EnablePreviewFeatures>
		<GenerateRequiresPreviewFeaturesAttribute>true</GenerateRequiresPreviewFeaturesAttribute>
		<Nullable>enable</Nullable>
		<ImplicitUsings>enable</ImplicitUsings>
	</PropertyGroup>
	<PropertyGroup>

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    public static class SystemHostsFileManager
    {
        private static readonly string _filePath = @"C:\Windows\System32\drivers\etc\hosts";

        public static IEnumerable<(string Ip, string Site, string? Description)> ReadRules() =>
            from rule in File.ReadAllText(_filePath).Split(Environment.NewLine)
            where !string.IsNullOrEmpty(rule) && !rule.StartsWith("#")
            let description = rule.IndexOf("#") > 0 ? rule[(rule.IndexOf("#") + 1)..] : null
            let pair = rule.Split(" ")
            let ip = pair[0].Trim()

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public static class XmlSerializer
{
    public static void Serialize<T>(T? o, string path!!, bool indent = true)
    {
        var serializer = new System.Xml.Serialization.XmlSerializer(typeof(T));
        using var writer = new StreamWriter(path);
        using var xmlWriter = System.Xml.XmlWriter.Create(writer, new System.Xml.XmlWriterSettings { Indent = indent });
        serializer.Serialize(xmlWriter, o);
    }

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puvlic static class Extensions
{
    public static Func<TResult> Compose<TResult>(this Func<TResult> create!!, params Func<TResult, TResult>[] funcs!!)
    {
        var result = () =>
        {
            var value = create();
            foreach (var func in funcs)
            {
                value = func(value);

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public record PagingParams(in int PageIndex = 0, in int? PageSize = null);
public record PagingResult<T>(IReadOnlyList<T> Result, in long TotalCount);

    public static async Task<PagingResult<T>> ToListPagingAsync<T>(this IQueryable<T> query, PagingParams? paging, CancellationToken cancellationToken = default)
    {
        var total = await query.CountAsync(cancellationToken: cancellationToken);

        if (paging is null or { PageSize: null or 0 })
        {
            var dbNoPagingResult = await query.ToListAsync(cancellationToken: cancellationToken);