系统空闲时间判断&命名验证

using System;
using System.Runtime.InteropServices;

namespace SCADA.RTDB.Framework.Helpers
{
    /// <summary>
    /// Class MouseKeyBoardOperate
    /// </summary>
   public class MouseKeyBoardOperate
    {
        /// <summary>
        /// 创建结构体用于返回捕获时间
        /// </summary>LayoutKind.Sequential 用于强制将成员按其出现的顺序进行顺序布局。
        [StructLayout(LayoutKind.Sequential)]
        struct LASTINPUTINFO
        {
            /// <summary>
            /// 设置结构体块容量
            /// </summary>MarshalAs属性指示如何在托管代码和非托管代码之间封送数据。
            [MarshalAs(UnmanagedType.U4)]
            public int cbSize;

            /// <summary>
            /// 抓获的时间
            /// </summary>
            [MarshalAs(UnmanagedType.U4)]
            public uint dwTime;
        }

        static LASTINPUTINFO vLastInputInfo;
        public MouseKeyBoardOperate()
        {
            vLastInputInfo = new LASTINPUTINFO();
        }

        [DllImport("user32.dll")]
        private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
        /// <summary>
        /// 获取键盘和鼠标没有操作的时间
        /// </summary>
        /// <returns>用户上次使用系统到现在的时间间隔，单位为秒</returns>
        public static long GetLastInputTime()
        {
            //LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();
            vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);
            if (!GetLastInputInfo(ref vLastInputInfo))
            {
                return 0;
            }
            else
            {
                long count = Environment.TickCount - (long)vLastInputInfo.dwTime;
                long icount = count / 1000;
                return icount;
            }
        }
    }
}

 public class NameValidationHelper
    {
        public static bool IsValidIdentifierName(string name)
        {
            // Grammar:
            // <identifier> ::= <identifier_start> ( <identifier_start> | <identifier_extend> )*
            // <identifier_start> ::= [{Lu}{Ll}{Lt}{Lo}{Nl}(‘_‘)]
            // <identifier_extend> ::= [{Mn}{Mc}{Lm}{Nd}]
            UnicodeCategory uc;
            for (int i = 0; i < name.Length; i++)
            {
                uc = Char.GetUnicodeCategory(name[i]);
                bool idStart = (uc == UnicodeCategory.UppercaseLetter || // (Lu)
                                uc == UnicodeCategory.LowercaseLetter || // (Ll)
                                uc == UnicodeCategory.TitlecaseLetter || // (Lt)
                                uc == UnicodeCategory.OtherLetter || // (Lo)
                                uc == UnicodeCategory.LetterNumber || // (Nl)
                                name[i] == ‘_‘);
                bool idExtend = (uc == UnicodeCategory.NonSpacingMark || // (Mn)
                                 uc == UnicodeCategory.SpacingCombiningMark || // (Mc)
                                 uc == UnicodeCategory.ModifierLetter || // (Lm)
                                 uc == UnicodeCategory.DecimalDigitNumber); // (Nd)
                if (i == 0)
                {
                    if (!idStart)
                    {
                        return false;
                    }
                }
                else if (!(idStart || idExtend))
                {
                    return false;
                }
            }

            return true;
        }
    }