private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != '\r')
                e.Handled = true;
        }

------解决方案--------------------

C# code

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != (char)Keys.Return)
            e.Handled = true;
        }

------解决方案--------------------
  private void rtbtxt_KeyUp(object sender, KeyEventArgs e)
       {
           if (e.KeyValue ！= 13)
            {  
               retrun;
            }
       }
点击键盘。除了回车其余都屏蔽。






------解决方案--------------------
private void rtbtxt_KeyUp(object sender, KeyEventArgs e)
 {
 if (e.KeyValue ！= 13)
 { 
 retrun;
 }
 }
点击键盘。除了回车其余都屏蔽。



------解决方案--------------------

C# code

  private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Return)
                ; 
                //处理响应回车的代码
            else
                 e.Handled = false; 
         }

------解决方案--------------------
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C# code
        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar != '\r')
                e.Handled = true;
        }