how to use C# dictionary in typescript?

You can do something like this:

let lengthsByCountry: { [key: string]: number; } = {};

Then initialize the items:

lengthsByCountry["AD"] = 24;

There's no direct mapping for the inline initialization at present, as far as I know.

You can use Map object. Map is a new data structure introduced in ES6 which lets you map keys to values without the drawbacks of using Objects.

For example

let map = new Map();
map.set("A",1);
map.set("B",2);
map.set("C",3);

It's just a javascript object.

 export interface Dto {
      lengthsByCountry: { [name: string]: string };
    }

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