c# - MediaCapture 中的 InitializeAsync 不起作用

Question

当我这样做时:

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
            }

我遇到了这个错误:

错误 1 ​​'await' 运算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“任务”。

所以我尝试“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？也许图书馆有问题？谢谢

Answer 1

你需要像这样改变你的方法:

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
        }

}