NDiiong

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

static partial class Sequence
{
    /// <summary>
    /// Splits the sequence into two sequences, containing the elements 
    /// for which the given predicate returns <c>true</c> and <c>false</c> 

NDiiong

using System.Xml.Linq;

namespace Json.Linq
{
    public class JDocument : XDocument
    {
        public JDocument() : base() { }
        public JDocument(params object[] content) : base(content) { }
        public JDocument(XDocument other) : base(other) { }
        public JDocument(XDeclaration declaration, params object[] content) : base(declaration, content) { }

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public static async Task<IEnumerable<T>> WhereAsync<T>(this IEnumerable<T> collection, Func<T, Task<bool>> predicate)
{
    var itemTaskList = collection.Select(item => new { Item = item, PredTask = predicate.Invoke(item) }).ToList();

    await Task.WhenAll(itemTaskList.Select(x => x.PredTask)).ConfigureAwait(false);

    return itemTaskList.Where(x => x.PredTask.Result).Select(x => x.Item);
}

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class Abstraction 
{ 
    Bridge bridge; 
    public Abstraction(Bridge implementation) 
    { 
        bridge = implementation; 
    } 
    public string Operation() 
    { 
        return "Abstraction <<< BRIDGE >>>> " + bridge.OperationImp(); 

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Guard.Against<InvalidOperationException>(string.IsNullOrEmpty(serverName), "Server name must be provided")

NDiiong

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace Ormazabal.PanelMonitoring.Helpers
{
    static class Expressions

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public static class Guard
{
	public static void NotNull<T>(Expression<Func<T>> notNullableExpression) where T : class
	{
		var compliedExpression = notNullableExpression.Compile();
		if (compliedExpression() == null)
		{
			var paramName = notNullableExpression.GetObjectNameGraph();
			throw new ArgumentNullException(paramName);

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public static TSource Strict<TSource, TExpect>(this IEnumerable<TSource> source)
{
    if (source is null) throw new ArgumentNullException(nameof(source));
    return source.Single(sour => sour.GetType() == typeof(TExpect));
}

public static TSource StrictOrDefault<TSource, TExpect>(this IEnumerable<TSource> source)
{
    if (source is null) throw new ArgumentNullException(nameof(source));
    return source.SingleOrDefault(sour => sour.GetType() == typeof(TExpect));

NDiiong

private static HttpClient client = new HttpClient();

// GET
var response = await client.GetAsync(@"http://localhost/admin");
var cookies = response.Headers.FirstOrDefault(pair => String.Compare(pair.Key, @"Set-Cookie", StringComparison.OrdinalIgnoreCase) == 0).Value;

// get token from html
var html = await response.Content.ReadAsStringAsync();
var regex = new Regex("(name=\\\"_token\\\" value=)\\\"(.*)\\\"");
var token = regex.Match(html).Groups[2].Value;

NDiiong

using System.Collections.Generic;
using Newtonsoft.Json;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json.Converters;

namespace ArchDev
{
	public static class HttpClientExtensions