我有一段代码可以在URI有效时正确地从http URI加载图像,但是我不知道如何在URI无效时捕获OpenAsync抛出的异常(结果为404)。BitmapImage(); Uri^ uri = ref new Uri("http://invaliduri.tumblr.com/avatar/128");
auto task= Concurrency::create_task(CreateStreamedFileFromUriAsyn
我正在尝试使用WinRT API WIndows::System::Launcher::LaunchFileAsync()启动一个映像。GoodMan\\Pictures\\wood.png"); Windows::System::Launcher::LaunchFileAsync(file);
错误C2665:'Windo
Windows.Foundation.IAsyncOperation<StorePurchaseResult> purchase = product.RequestPurchaseAsync(); { }
private async Task\r\n\r\nThis function must be called from a