ASP.NET C# Switch Case 拆解 Dictionary

軟體開發時，有時候會遇到主流程中突然冒出一堆 switch case 的判斷
雖然有 #region #endregion 可以縮排，但在偵錯時候就會需要在switch中徘徊
因此好奇別人switch case都是怎麼改善
Google大神就被我看見這篇文章 [C#] Refactor – 重構 Switch case 陳述句
我這邊也簡單整理一下留下筆記，未來需要使用可以快速進入狀況
改善的寫法有點像JavaScript

原本Switch Case

switch (status)
{
    case "Success": Console.WriteLine("成功"); break;
    case "Fail": Console.WriteLine("失敗"); break;
    case "Wait": Console.WriteLine("等待中"); break;
    case "Cancel": Console.WriteLine("取消"); break;
}

改良版 ( Enum + Dictionary<enum, Action> )

public enum Status
{
    Success,
    Fail,
    Wait,
    Cancel
}

private Dictionary<Status, Action> _statusHandle = new Dictionary<Status, Action>()
{
    { Status.Success, ()=> Console.WriteLine("成功") },
    { Status.Fail, ()=> Console.WriteLine("失敗") },
    { Status.Wait, ()=> Console.WriteLine("等待中") },
    { Status.Cancel, ()=> Console.WriteLine("取消") }
};

if (_statusHandle.ContainsKey(Status.Success)) _statusHandle[Status.Success].Invoke();
// output: 成功

 

原本Switch Case

string name = "申購股票";
switch (status)
{
    case "Success": Console.WriteLine($"{name}成功"); break;
    case "Fail": Console.WriteLine($"{name}失敗"); break;
    case "Wait": Console.WriteLine($"{name}等待中"); break;
    case "Cancel": Console.WriteLine($"{name}取消"); break;
}

改良版 ( Enum + Dictionary<enum, Func<string, string>> )

public enum Status
{
    Success,
    Fail,
    Wait,
    Cancel
}

private Dictionary<Status, Func<string, string>> _statusHandle = new Dictionary<Status, Func<string, string>>()
{
    { Status.Success, name => Console.WriteLine($"{name}成功") },
    { Status.Fail, name => Console.WriteLine($"{name}失敗") },
    { Status.Wait, name => Console.WriteLine($"{name}等待中") },
    { Status.Cancel, name => Console.WriteLine($"{name}取消") }
};

if (_statusHandle.ContainsKey(Status.Success)) _statusHandle[Status.Success].Invoke("申購股票");
// output: 申購股票成功