Question

C#如何获取键盘的输入啊？

比如我要做一个拼图游戏，在电脑上按方向键时，程序应该产生怎么样的事件啊？

Answer 1

1.   C# 获取键盘输入数字的值                    

2. C# 代码如下：

3. /// <summary>
           /// 重载ProcessCmdKey事件
           /// </summary>
           /// <param name="msg"></param>
           /// <param name="keyData"></param>
           /// <returns></returns>
           protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
           {
               int index = dgvBasesList.CurrentCell.RowIndex;
               string text = Clipboard.GetText();
               EventArgs e = new EventArgs();
               if (keyData == Keys.Enter)
               {
                   this.btnOK_Click(this, e);
               }
               else if (keyData == Keys.Down)
               {
                   if (index < dgvBasesList.Rows.Count - 1)
                   {
                       // dgvBasesList.Rows[index + 1].Selected =true ;
                       dgvBasesList.CurrentCell = dgvBasesList[0, index + 1];
                       txtNo.Text = (dgvBasesList.CurrentRow.Index + 1).ToString();
                   }
               }
               else if (keyData == Keys.Up)
               {
                   if (index > 0)
                   {
                       dgvBasesList.CurrentCell = dgvBasesList[0, index - 1];
                       txtNo.Text = (dgvBasesList.CurrentRow.Index + 1).ToString();
                   }
               }
               else if ((keyData >= Keys.D0 && keyData <= Keys.D9) || (keyData >= Keys.NumPad0 && keyData <= Keys.NumPad9))
               {
                   string num = KeyCodeToStr(keyData);
                   string num1 = num;
                   int no = Int32.Parse(txtNo.Text.ToString() + num);
                   if (no > dgvBasesList.Rows.Count - 1)
                   {
                       if (Int32.Parse(num) > dgvBasesList.Rows.Count)
                       {
                           dgvBasesList.CurrentCell = dgvBasesList[0, dgvBasesList.Rows.Count - 1];
                           txtNo.Text = (dgvBasesList.Rows.Count - 1).ToString();
                       }
                       else if (Int32.Parse(num) > 0)
                       {
                           dgvBasesList.CurrentCell = dgvBasesList[0, Int32.Parse(num) - 1];
                           txtNo.Text = num.ToString();
                       }
                   }
                   else
                   {
                       dgvBasesList.CurrentCell = dgvBasesList[0, no - 1];
                       txtNo.Text = no.ToString();
                   }
               }
               return true;

4.         }
           [DllImport("user32.dll")]
           static extern int MapVirtualKey(uint uCode, uint uMapType);

5.         private static char KeyCodeToChar(Keys k)
           {
               int nonVirtualKey = MapVirtualKey((uint)k, 2);
               char mappedChar = Convert.ToChar(nonVirtualKey);
               return mappedChar;
           }
           public static string KeyCodeToStr(Keys k)
           {
               char mappedChar = KeyCodeToChar(k);
               string str = mappedChar.ToString();
               if (Char.IsWhiteSpace(mappedChar) || string.IsNullOrEmpty(str) || mappedChar == '\r' || mappedChar == '\n' || mappedChar == KeyCodeToChar(Keys.F1))
               {
                   return k.ToString();
               }
               else
               {
                   return str + "";
               }
           }

Answer 2

如果单是方向键呢OnKeyDown就可以，如果涉及其他功能键或者组合键，我想你还是去了解下系统API

Answer 3

OnKeyDown消息响应事件，响应键盘输入。

Answer 4

KeyDown

Answer 5

C#中，有个KeyDown的事件就是指电脑键盘按下后的效果。你可以去看看