BarcodeScannerPreviewActivatedEventArgs.ConnectionId 属性

public:
 property Platform::String ^ ConnectionId { Platform::String ^ get(); };

winrt::hstring ConnectionId();

public string ConnectionId { get; }

var string = barcodeScannerPreviewActivatedEventArgs.connectionId;

Public ReadOnly Property ConnectionId As String

属性值

连接 ID。

实现

示例

此示例从已激活的参数获取连接 ID，然后使用它启动视频预览页。

protected override async void OnActivated(IActivatedEventArgs args)
{
    base.OnActivated(args);

    if (args.Kind == ActivationKind.BarcodeScannerProvider)
    {
        ... // Create and activate root frame. 

        var eventArgs = args as BarcodeScannerPreviewActivatedEventArgs;
        string connectionId = eventArgs.ConnectionId;

        BarcodeScannerProviderConnection connection = _taskList.GetConnection(connectionId);
        if (connection != null)
        {
            var page = rootFrame.Content as MainPage;
            if (page != null)
            {
                await page.StartVideoPreview(connection);
            }
        }
    }
}

适用于