c# - Enum.Parse() 或 Switch

Question

对于将字符串转换为枚举，以下哪种方式更好？

1. 这段代码:

   colorEnum color = (colorEnum)Enum.Parse(typeof(colorEnum), "Green");
   

2. 或者这个:

   string colorString = ...
   colorEnum color;        
   switch (colorString)
   {
       case "Green":
           color = colorEnum.Green;
           break;
       case "Red":
           color = colorEnum.Red;
           break;
       case "Orange":
           color = colorEnum.Orange;
           break;
       ....
   }
   

Answer 1

你应该使用 Enum.TryParse，如果失败你可以正确处理错误。

示例:

     ColorsEnum colorValue; 
     if (Enum.TryParse(colorString, out colorValue))        
        if (Enum.IsDefined(typeof(Colors), colorValue) | colorValue.ToString().Contains(","))  
           Console.WriteLine("Converted '{0}' to {1}.", colorString, colorValue.ToString());
        else
           Console.WriteLine("{0} is not an underlying value of the Colors enumeration.", colorString);
     else
        Console.WriteLine("{0} is not a member of the Colors enumeration.", colorString);