怎么样限制不能全角输入，只能是半角

Question

怎么样限制不能全角输入，只能是半角

Answer 1

        /// <summary>
       /// 判断字符是否全角
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        private bool JudgeStrIsCh(string str)
        {
            //全角
            if (Regex.IsMatch(str, @"[^\u0000-\u00ff]+"))
            {
                return true;
            }
            else
            {
                return false;
            }
        }

Answer 2

正则表达式限制:[^\uFF00-\uFFFF]