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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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系统设计备忘录

挑选正确的架构约等于选择正确的战斗并做好权衡

基本步骤

1. 明确系统边界

• 用户案列 (描述哪些业务，事件，组合在一起会产生什么样的效果)
  • 谁使用这个系统?
  • 他们怎么使用这个系统?

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using System;
using System.Threading;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;

namespace CrazyVote1
{
    class Program
    {
        static void Main(string[] args)

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using System;

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Assembly)]
    public sealed class ExtensionAttribute : Attribute
    {
    }
}

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/// <summary>
/// Convert Image to Icon.
/// </summary>
/// <param name="image">The source image.</param>
public static Icon ConvertToIcon(Image image, bool nullTonull = false)
{
    if (image == null)
    {
        if (nullTonull) 
        { 

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using System;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            // Want to detect which build is used
            Console.WriteLine(BuildConfiguration.IsDebug ? "Debug" : "Release");

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using System.Threading;
using DevLib.Diagnostics;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            Benchmark.Run(i =>

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//-----------------------------------------------------------------------
// <copyright file="Benchmark.cs" company="YuGuan Corporation">
//     Copyright (c) YuGuan Corporation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DevLib.Diagnostics
{
    using System;
    using System.Diagnostics;
    using System.Diagnostics.CodeAnalysis;

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static void Main(string[] args)
{
    RunStopwatch(() =>
    {
        foreach (var item in collection)
        {
            DoSomething(item);
        }
    });
}

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Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();

foreach (var item in collection)
{
    DoSomething(item);
}

stopWatch.Stop();