如何将整数转换为枚举类型？ [英] How do I convert an integer to an enumerated type?

问题描述

我知道如何将枚举类型转换为整数。

I know how to convert an enumerated type to an integer.

type
  TMyType = (mtFirst, mtSecond, mtThird); 

var 
  ordValue:integer;
  enumValue:TMyType;
...
ordValue:= Ord(mtSecond); // result is 1

但是我该如何进行逆运算并将整数转换为枚举类型？

But how do I do the inverse operation and convert an integer to an enumerated type?

推荐答案

正如Ken回答，你只是投了。但是要确保你有正确的价值，你可以使用如下代码：

As Ken answered, you just cast it. But to make sure you have correct value you can use code like:

if (ordValue >= Ord(Low(TMyType))) and (ordValue <= Ord(High(TMyType))) then
    enunValue := TMyType(ordValue)
else 
    raise Exception.Create('ordValue out of TMyType range');

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