[英]How to have alternative string definition for numeric enum in typescript
I have a numeric enum like below.我有一个像下面这样的数字枚举。
enum Rating {
Unknown = 0,
One,
Two,
Three,
Four
}
I need to get alternative string value of enum when I access the enum string like below.当我访问像下面这样的枚举字符串时,我需要获取枚举的替代字符串值。
var stringVal = Rating[Rating.One];
The above line should give me "Rating of One" instead of One.上面的行应该给我“评级为一”而不是一。
I need to stick to numeric enums and cannot use string enums.我需要坚持使用数字枚举,不能使用字符串枚举。 Once solution what I could think of is to use string array like below.
一旦我能想到的解决方案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];
But is there a better way to achieve this in typescript?但是有没有更好的方法可以在打字稿中实现这一点?
I'm expecting something like Description attribute in c# for enums like below我期待像下面这样的枚举在 c# 中的描述属性
public enum MyEnum
{
[Description("value 1")]
Value1,
[Description("value 2")]
Value2,
[Description("value 3")]
Value3
}
You could store the enum strings in a Map
object: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);
...
}
Alternatively, in cases where the string format is the same for all enum values, you could use a function like the following:或者,如果所有枚举值的字符串格式都相同,您可以使用如下函数:
ratingToString(rating: Rating): string {
return `Rating ${Rating[rating]}`;
}
doSomething() {
let str = this.ratingToString(Rating.Unknown);
...
}
See this stackblitz for a demo of both techniques.有关这两种技术的演示,请参阅此 stackblitz 。
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