Question

我正在创建一个应用程序，用于测量一个人凝视约300个物体的时间。对于所有对象，它需要将时间输出到文本文件中。我已经成功地为一个对象编写了代码，但是我正在尝试为300个对象编写代码。这是我为一个对象创建的代码：

echo "\\\\\\\\"

每次在变量或元素名称中插入“ 1”时，我都希望所有300个对象都具有该值。这就是我想要的：

Stopwatch Timer = new Stopwatch();
        gazeButtonControl1 = GazeInput.GetGazeElement(GazeBlock1);
        gazeButtonControl1 = new GazeElement();
        GazeInput.SetGazeElement(GazeBlock1, gazeButtonControl1);
        TimeSpan Word1 = TimeSpan.Zero;
        gazeButtonControl1.StateChanged += GazeBlockControl1_StateChanged;
        void GazeBlockControl1_StateChanged(object sender, StateChangedEventArgs ea)
        {
            if (ea.PointerState == PointerState.Enter)
            {
                Timer.Start();

            }


            if (ea.PointerState == PointerState.Exit)
            {
                Timer.Stop();
                Word1 += Timer.Elapsed;
                File.WriteAllText(@"*insert path here", Word1.ToString());
                Timer.Reset();
            }
        }

此代码无效。我试过使用列表，但也没有用。有谁知道如何使该解决方案有效？预先感谢！

Vincent

Answer 1

您不能在变量，方法等名称中使用占位符或数组索引。

对于UWP，似乎有一个辅助方法FindChildByName，该方法可让您通过(TypeOfChildControl)insertParentControlHere.FindChildByName("<Name of child control>")来按其名称查找控件。

我发现以下令人困惑的代码：

gazeButtonControl1 = GazeInput.GetGazeElement(GazeBlock1);
gazeButtonControl1 = new GazeElement();
GazeInput.SetGazeElement(GazeBlock1, gazeButtonControl1);

基本上，首先从gazeButtonControl1获取GazeBlock1，然后忽略它以创建新的GazeElement。我猜这是什么意思，像in this UWP Gaze sample一样，它首先检查UI控件是否具有凝视元素并且是否没有创建。所以我认为应该是：

gazeButtonControl1 = GazeInput.GetGazeElement(GazeBlock1);
if (gazeButtonControl1 == null)
{
  gazeButtonControl1 = new GazeElement();
  GazeInput.SetGazeElement(GazeBlock1, gazeButtonControl1);
}

就像我在最初的评论中所写的那样，您可能需要为每个凝视元素单独设置一个计时器。

所以总的来说应该是这样（尽管未经测试）：

public class YourClass
{
  private TimeSpan[] Word = new TimeSpan[300];
  private Stopwatch[] Timer = new Stopwatch[300];
  private GazeElement[] gazeButtonControl = new GazeElement[300];

  public YourMethod(...)
  {
    for (int i = 0; i < 300; i++)
    {
      // first find gaze block where parentControl is the control containing your gaze blocks.
      var gazeBlock = (UIElement)parentControl.FindChildByName("GazeBlock" + (i + 1));

      gazeButtonControl[i] = GazeInput.GetGazeElement(gazeBlock);
      if (gazeButtonControl[i] == null)
      {
        gazeButtonControl[i] = new GazeElement();
        GazeInput.SetGazeElement(gazeBlock, gazeButtonControl[i]);
      }

      Word[i] = TimeSpan.Zero;
      Timer[i] = new Stopwatch();
      gazeButtonControl[i].StateChanged += GazeBlockControl_StateChanged;
    }
  }

  private void GazeBlockControl_StateChanged(object sender, StateChangedEventArgs ea)
  {
    // get the GazeElement for which this event was raised
    var changedControl = (GazeElement)sender;
    // find its index in your list of GazeElements.
    var i = Array.IndexOf(gazeButtonControl, changedControl); 

    if (ea.PointerState == PointerState.Enter)
    {
      Timer[i].Start();
    }

    if (ea.PointerState == PointerState.Exit)
    {
      Timer[i].Stop();
      Word[i] += Timer.Elapsed;
      File.WriteAllText(@"*insert path here", Word[i].ToString());
      Timer[i].Reset();
    }
  }
}

请不要因为我将gazeButtonControl声明为数组而使用Array.IndexOf而不是gazeButtonControl.IndexOf。如果它是列表（例如List<GazeElement> gazeButtonControl），则可以使用gazeButtonControl.IndexOf。

使用循环在C＃中创建变量

1 个答案: