Leandro Fernandes leandromoh

💭

Talk is Cheap, Show me the code!

.NET developer and MCP in C#, with exceptional interesting about programming paradigms. Degree in System Analysis and Development

leandromoh / read csv with task.cs

Last active September 18, 2021 03:13

	public static IEnumerable<Memory<char>> TryReadLine(TextReader reader)
	{
	var bufferLength = (int)Math.Pow(2, 16);
	var buffer = ArrayPool<char>.Shared.Rent(bufferLength);

	var i = 0;
	var j = 0;
	var state = State.BeforeField;
	int c;

leandromoh / read csv lines RFC4180 from file.cs

Last active September 15, 2021 04:53

	private enum State
	{
	BeforeField,
	InField,
	InQuotedField,
	LineEnd,
	}

	public static IEnumerable<Memory<char>> TryReadLine(TextReader reader)
	{

leandromoh / TryFormat for Enum.cs

Last active December 19, 2021 05:00

TryFormat for Enum with Span.cs

	using BenchmarkDotNet.Attributes;
	using BenchmarkDotNet.Running;
	using System;
	using System.Diagnostics;
	using System.Globalization;
	using System.Linq;
	using System.Linq.Expressions;

	// ``` ini
	//

leandromoh / SQLServer bulkCopy.cs

Created August 20, 2021 22:31

	using var bulkCopy = new SqlBulkCopy(
	_connection,
	SqlBulkCopyOptions.TableLock \|
	SqlBulkCopyOptions.FireTriggers \|
	SqlBulkCopyOptions.UseInternalTransaction,
	null
	);

	bulkCopy.DestinationTableName = "table";
	bulkCopy.BatchSize = 150_000;

leandromoh / calcula dividendo.js

Created August 14, 2021 16:43

	const puppeteer = require('puppeteer');

	(async () => {
	const browser = await puppeteer.launch({headless: false});
	const page = await browser.newPage();
	const fii = { };

	fii["XPTO"] = { qtd: 1 };

	for(const ticker in fii){

leandromoh / C# Além do basico pauta - leandro.txt

Created August 10, 2021 16:27

C# Além do basico pauta - leandro.txt

	- Function first class citizen (guardar em variavel, função receber ou retornar outra função)
	- Delegates (funções anonimas ou não)
	- Actions/Func
	- Lambda/Delegate
	- LINQ
	- Iterators (yield return, yield break)
	- Expression Tree
	- Baixo nivel (Class vs Struct, Span, ranges, ArrayPool, stackallock)
	- Regex

leandromoh / PDI c# .net topics

Last active September 22, 2021 19:27

	colections array, list, queue, stack, dictionary, hashset
	concurrent collections (ConcurrentBag, ConcurrentStack, ConcurrentQueue, etc)

	imutabilidade
	transparency referential
	side-effects
	pure functions
	span, readOnlySpan, stackalloc, arrayPool, IOPipeline
	ref, out, in
	pattern match

leandromoh / post_json_array.cs

Created June 12, 2021 21:48

reads json file with array of objects and post them in batches (example: post 6 requests in parallel, each time)

	using MoreLinq;
	using Newtonsoft.Json;
	using Newtonsoft.Json.Linq;
	using System;
	using System.Collections.Generic;
	using System.IO;
	using System.Linq;
	using System.Net;
	using System.Net.Http;
	using System.Reflection;

leandromoh / ClosureVisitor.cs

Created February 28, 2021 05:16

ExpressionVisitor that resolve closures for primitive types

	using System;
	using System.Linq.Expressions;
	using System.Reflection;

	namespace RecordParser.Generic
	{
	public class ClosureVisitor : ExpressionVisitor
	{
	protected override Expression VisitMember(MemberExpression member)
	{

leandromoh / Spread operator c#.cs

Last active February 19, 2021 21:51

Spread operator csharp

	using System;
	using System.Collections.Concurrent;
	using System.Collections.Generic;
	using System.Linq;
	using System.Reflection;
	using System.Reflection.Emit;

	namespace Playground
	{
	public class Program