C# 组合键 判断，文本框不接受纯回车enter

 if (e.Modifiers.CompareTo(Keys.Shift) == 0 && e.KeyCode == Keys.Enter)
                    {
                        return;
                    }
                    e.SuppressKeyPress = true;

原文：https://www.cnblogs.com/LuoCore/p/15124065.html