Enum的介紹很多,這裡就不囉嗦了。
首先宣告OrderStatus為Enum Type
public enum OrderStatus:int
{
Pending = 10, Processing = 20, Completed = 30, Canceled = 40
}
讓後就可以在程式中使用了
//容易閱讀的範例
OrderStatus status;
status = OrderStatus.Completed;
switch(status)
{
case OrderStatus.Canceled:
//訂單取消相關的程式...
Console.WriteLine("Order was {0} and status code is {1}.", status, (int)status);
break;
case OrderStatus.Completed:
//訂單完成相關的程式...
Console.WriteLine("Order was {0} and status code is {1}.", status, (int)status);
break;
case OrderStatus.Pending:
//訂單擱置未定相關的程式...
Console.WriteLine("Order was {0} and status code is {1}.", status, (int)status);
break;
case OrderStatus.Processing:
//訂單處理中相關的程式...
Console.WriteLine("Order was {0} and status code is {1}.", status, (int)status);
break;
}
以前如果没有使用Enum,case後面可能是一個數字,然後再加上註解說明這個數字代表的意思,由以上例子可以很容易發現Enum的好處。
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