c# - 在控制台打印数组

Question

我想要一个返回数组的函数。我首先使用 void 函数对此进行了测试，但控制台中的字符串为空，而且我没有找到我的保管库。

private void getValueOfRadio() {
  string[,] arrayUrl = new String[4, 3] {
    { "xx0",       "xxx0",    "xxxx0" },
    { "xx1",       "xxx1",    "xxxx1" },
    { "xx2",       "xxx2",    "xxxx2" },
    { "xx3",       "xxx3",    "xxxx3" }
  };

  var checkedRadioButton = groupUrl
    .Controls
    .OfType<RadioButton>()
    .FirstOrDefault(x => x.Checked == true);

  int i = 0;
  if (checkedRadioButton != null) {
    switch (checkedRadioButton.Text) {
      case "MK-Live":
        i = 1;
        break;
      case "MK-Test":
        i = 2;
        break;
      case "Roland Test":
        i = 3;
        break;
      default:
        i = 0;
        break;
      }
    }

    string[] returnArray = new string[] { 
      arrayUrl[i, 0], arrayUrl[i, 1], arrayUrl[i, 2] };

    Console.WriteLine(returnArray);
  }

Answer 1

让我们提取一些方法:RowIndexFromButton - 我们要打印哪一行(基于单选按钮)和RowFromArray - 从二维数组中提取行.

   private int RowIndexFromButton() {
     var checkedRadioButton = groupUrl
       .Controls
       .OfType<RadioButton>()
       .FirstOrDefault(x => x.Checked);

     if (checkedRadioButton == null)
       return -1; //TODO: or 0 if we want to get 0th record

     switch (checkedRadioButton.Text) { 
       case "MK-Live":
         return 1;
       case "MK-Test":
         return 2;
       case "Roland Test":
         return 3;
       default:
         return 0;
     }
   }

   private static IEnumerable<T> RowFromArray<T>(T[,] array, int row) {
     if (null == array)
       throw new ArgumentNullException(nameof(array));
     else if (row < array.GetLowerBound(0) || row > array.GetUpperBound(0))
       yield break;

     for (int i = array.GetLowerBound(1); i <= array.GetUpperBound(1); ++i)
       yield return array[row, i];
   }

然后我们可以轻松地将这两种方法结合在一起:

I wanna have a function which return a array

   private T[] RowFromButton<T>(T[,] array) {
     return RowFromArray(array, RowIndexFromButton()).ToArray();
   }

并使用它:

   string[,] arrayUrl = new String[4, 3] {
     { "xx0", "xxx0", "xxxx0" },
     { "xx1", "xxx1", "xxxx1" },
     { "xx2", "xxx2", "xxxx2" },
     { "xx3", "xxx3", "xxxx3" }
   };

   string[] returnArray = RowFromButton(arrayUrl); 

   // When printing collection (array) we should join items (e.g. with space)
   Console.WriteLine(string.Join(" ", returnArray));