在Surface Pro 3中，如果VideoDevicesComboBox.SelectedItem =“Microsoft LifeCam Rear”，则程序崩溃。为什么？ ？ ？ [英] In Surface Pro 3,if VideoDevicesComboBox.SelectedItem = "Microsoft LifeCam Rear",The program breakdown.why ? ? ?

问题描述

 WebcamCtrl.StartCapture（）; 
  foreach （EncoderDevice device  in  _vidDevices.Where（device = >  device.Name ==   Microsoft LifeCam Rear））
 {
 VideoDevicesComboBox.SelectedItem = device; 
  break ; 
} 

解决方案

试试这个

  var  devices = _vidDevices.Where（device = >  device.Name ==   Microsoft LifeCam Rear）; 
  if （devices！=  null ）
 {
  foreach （EncoderDevice device  in  devices）
 {
 VideoDevicesComboBox.SelectedItem = device; 
  break ; 
} 
} 

然后分析变量 devices contains。

要使foreach循环起作用，变量 devices 应该是一个列表，即使它是空的（长度= 0）

WebcamCtrl.StartCapture();
foreach (EncoderDevice device in _vidDevices.Where(device => device.Name == "Microsoft LifeCam Rear"))
{
    VideoDevicesComboBox.SelectedItem = device;
    break;
}

解决方案

Try this

var devices = _vidDevices.Where(device => device.Name == "Microsoft LifeCam Rear");
if (devices != null)
{
    foreach (EncoderDevice device in devices)
    {
        VideoDevicesComboBox.SelectedItem = device;
        break;
    }
}

Then analyze what the variable devices contains.
For a foreach loop to work, the variable devices should be a list, even if it is empty (length = 0).

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