枚举vs Const vs Class Const在Delphi编程中 [英] Enums vs Const vs Class Const in Delphi programming

问题描述

我在ClientDataSet中有一个整数字段，我需要比较一些值，如下所示：

我可以使用const

  const 
 mvValue1 = 1; 
 mvValue2 = 2; 
 
如果ClientDataSet_Field.AsInteger = mvValue1然后
  

或枚举

  TMyValues =（mvValue1 = 1，mvValue2 = 2）; 
 
如果ClientDataSet_Field.AsInteger = Integer（mvValue1）然后
  

或类const

  TMyValue = class 
 const 
 Value1 = 1; 
 Value2 = 2; 
结束
 
如果ClientDataSet_Field.AsInteger = TMyValues.Value1然后
  

我喜欢类const方法，但似乎不是delphi的方式，所以我想知道你觉得如何

解决方案

我不会说类const不是Delphi的方式。只是他们最近才被介绍给Delphi，并且在互联网上发现的许多书籍和文章都是在他们介绍之前写的，因此你不会看到它们被广泛使用。许多Delphi开发人员（我会说大多数）将在开始使用Delphi之前开始使用，因此它们不是人们想到的第一件事。

I have an integer field in a ClientDataSet and I need to compare to some values, something like this:

I can use const

const
  mvValue1 = 1;
  mvValue2 = 2;

if ClientDataSet_Field.AsInteger = mvValue1 then

or enums

TMyValues = (mvValue1 = 1, mvValue2 = 2);

if ClientDataSet_Field.AsInteger = Integer(mvValue1) then

or class const

TMyValue = class
const
   Value1 = 1;
   Value2 = 2;
end;

if ClientDataSet_Field.AsInteger = TMyValues.Value1 then

I like the class const approach but it seems that is not the delphi way, So I want to know what do you think

解决方案

I wouldn't say that class consts are not the Delphi way. It's just they have been introduced to Delphi quite recently, and a lot of books and articles you'll find on the internet were written before their introduction, and thus you won't see them widely used. Many Delphi developers (I'd say the majority) will have started using Delphi before they were made available, and thus they're not the first thing that one thinks about.

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