Question

我有一个如下的数字枚举。

enum Rating {
  Unknown = 0,
  One,
  Two,
  Three,
  Four
}

当我访问如下所示的枚举字符串时，我需要获取枚举的备用字符串值。

var stringVal = Rating[Rating.One];

以上一行应该给我“ Rate of One”（而不是One）。

我需要坚持使用数字枚举，并且不能使用字符串枚举。一旦解决，我想到的就是使用如下所示的字符串数组。

const stringRating = ["Unknown Rating", "Rating One", "Rating is Two", "Rating is Three", "Rating is Four"];
export function toString(rating: Rating): string {
return stringValues[rating];

但是有没有更好的方法可以在打字稿中实现呢？

我期望像下面的枚举那样在c＃中使用诸如Description属性之类的东西

public enum MyEnum 
{ 
  [Description("value 1")] 
  Value1, 
  [Description("value 2")]
  Value2, 
  [Description("value 3")]
  Value3
}

Answer 1

您可以将枚举字符串存储在Map对象中：

ratingStrings = new Map<Rating,string>([
  [Rating.Unknown, "Unknown Rating"],
  [Rating.One, "Rating One"],
  [Rating.Two, "Rating is Two"],
  [Rating.Three, "Rating is Three"],
  [Rating.Four, "Rating is Four"],
]);

doSomething() {
  let str = this.ratingStrings.get(Rating.Unknown);
  ...
}

或者，如果所有枚举值的字符串格式都相同，则可以使用如下函数：

ratingToString(rating: Rating): string {
  return `Rating ${Rating[rating]}`;
}

doSomething() {
  let str = this.ratingToString(Rating.Unknown);
  ...
}

有关这两种技术的演示，请参见this stackblitz。

如何在打字稿

1 个答案: