问如何在ASP.NET C#中获取对应美元的比特币价值？

EN

var uri = String.Format("https://blockchain.info/tobtc?currency=USD&value={0}", 500);

WebClient client = new WebClient();
client.UseDefaultCredentials = true;
var data = client.DownloadString(uri);

var result = Convert.ToDouble(data);

public static async Task<double> GetBitcoinInUsd(double usd){
            //https://api.coinmarketcap.com/v1/ticker/bitcoin/
            CoinMarketCapClient client = CoinMarketCapClient.GetInstance();
            var entity = await client.GetTickerAsync("bitcoin");
            return entity.PriceUsd * usd;
}