InitializeAsync in MediaCapture不工作

Question

当我这么做时：

try
            {
                MediaCapture mc = new MediaCapture();
                await mc.InitializeAsync();

                if (mc.VideoDeviceController.TorchControl.Supported == true)
                {
                    mc.VideoDeviceController.TorchControl.Enabled = true;
                    if (mc.VideoDeviceController.TorchControl.PowerSupported == true)
                    {
                        mc.VideoDeviceController.TorchControl.PowerPercent = 100;
                    }
                }
            }
            catch(Exception ex)
            {
                //TODO: Report exception to user
            }

我发现了一个错误：

错误1‘等待’操作符只能在异步方法中使用。考虑使用‘异步’修饰符标记此方法，并将其返回类型更改为'Task'.。

所以我试着等待‘异步mc.InitializeAsync();'，然后我得到了这个错误：

‘错误1；预期’‘

我做错了什么？也许是图书馆出了问题？谢谢

Answer 1

您需要像这样更改您的方法：

public async Task Foo()
{
    //code
    try
        {
            MediaCapture mc = new MediaCapture();
            await mc.InitializeAsync();

            if (mc.VideoDeviceController.TorchControl.Supported == true)
            {
                mc.VideoDeviceController.TorchControl.Enabled = true;
                if (mc.VideoDeviceController.TorchControl.PowerSupported == true)
                {
                    mc.VideoDeviceController.TorchControl.PowerPercent = 100;
                }
            }
        }
        catch(Exception ex)
        {
            //TODO: Report exception to user
        }

}