如何在非异步函数中获得异步操作的值

Question

所以我有这个显示股价的小工具。我使用HTTP调用来获取股票价格，当然这个函数是异步的，在返回股票价格之前，我会在主体中等待网络服务完成。然而，每次我试图打印这只股票时，它都说这是一个未来，但我不知道如何打开它？我已经在网络电话中等待了，所以这不应该打开它，给我真正的价值吗？

StockService stockService = new StockService();
var stockPrice = stockService.getStockPriceBySymbol(symbols.elementAt(x));
print(stockPrice);

网络服务：

Future<dynamic> getStockPriceBySymbol(String symbol) async {
NetworkService networkService = NetworkService(
'$alphaStockApiURL?function=GLOBAL_QUOTE&symbol=$symbol&apikey=$kAlphaStockAPIKey');
var stockData = await networkService.getData();
// print(stockData['Global Quote']['05. price']);
return stockData['Global Quote']['05. price'];
}

Answer 1

您需要一个等待的stockService.getStockPriceBySymbol

var stockPrice = await stockService.getStockPriceBySymbol(symbols.elementAt(x));

或者未来。然后

stockService.getStockPriceBySymbol(symbols.elementAt(x)).then((stockPrice){
print(stockPrice);
)};