C# グリッド状に配置したTextBoxをカーソルキーで移動したい！

必要に駆られて書いたので覚書
もっとかんたんなほうほうあるんやろか

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

public partial class Form1 : Form     {         public Form1()         {             InitializeComponent();         }             List<textbox> textBoxList = new List<textbox>();           private void Form1_Load(object sender, EventArgs e)         {             foreach (var item in this.Controls)             {                 if (item is TextBox) textBoxList.Add(item as TextBox);             }               textBoxList.ForEach(x => x.KeyDown += X_KeyDown);             textBoxList.ForEach(x => x.Text = "hogehoge");         }           private void X_KeyDown(object sender, KeyEventArgs e)         {             var t = sender as TextBox;             TextBox nextControl;             switch (e.KeyCode)             {                 case Keys.Left:                     if (t.SelectionStart != 0 && t.SelectionLength != t.Text.Length) return;//文字列編集途中なら抜ける                       nextControl = textBoxList.Where(x => t.Location.X - 5 > x.Location.X)                         .OrderBy(x => getDistance(t.Location.X, t.Location.Y, x.Location.X, x.Location.Y)).FirstOrDefault();                       if (nextControl != null)                     {                         nextControl.Focus();                         nextControl.SelectAll();                     }                       break;                 case Keys.Up:                     nextControl = textBoxList.Where(x => t.Location.Y - 5 > x.Location.Y)                         .OrderBy(x => getDistance(t.Location.X, t.Location.Y, x.Location.X, x.Location.Y)).FirstOrDefault();                       if (nextControl != null)                     {                         nextControl.Focus();                         nextControl.SelectAll();                     }                     break;                 case Keys.Right:                     if (t.SelectionStart != t.TextLength  && t.SelectionLength != t.Text.Length) return;//文字列編集途中なら抜ける                                           nextControl = textBoxList.Where(x => t.Location.X + 5 < x.Location.X)                         .OrderBy(x => getDistance(t.Location.X, t.Location.Y, x.Location.X, x.Location.Y)).FirstOrDefault();                       if (nextControl != null)                     {                         nextControl.Focus();                         nextControl.SelectAll();                     }                     break;                 case Keys.Down:                     nextControl = textBoxList.Where(x => t.Location.Y + 5 < x.Location.Y)                         .OrderBy(x => getDistance(t.Location.X, t.Location.Y, x.Location.X, x.Location.Y)).FirstOrDefault();                       if (nextControl != null)                     {                         nextControl.Focus();                         nextControl.SelectAll();                     }                     break;             }           }           private double getDistance(double x1, double y1, double x2, double y2)         {             return Math.Sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));         }     }   </textbox></textbox>

最初からDataGrid系のコントロールを使えばよかった・・・