我的一类库
查询ACCESS
/// <summary>
/// OleDb查询数据库返回内容
/// </summary>
/// <param name="sql_str"></param>
/// <returns></returns>
protected DataTable dlBind(string sql_str)
{
oCon.Open();
OleDbCommand ps = new OleDbCommand(sql_str, oCon);
DataTable dt = new DataTable();
dt.Load(ps.ExecuteReader());
oCon.Close();
return dt;
}
打开文件并读取内容,保存字符到文件.
/// <summary>
/// 打开文件,反回字符串
/// </summary>
/// <param name="file_path">"SyntaxHighligher/com.html"</param>
/// <returns></returns>
private string openfiletext(string file_path)
{
StreamReader htmlreader = new StreamReader(file_path);
return htmlreader.ReadToEnd();
}
/// <summary>
/// 保存字符串到文件
/// </summary>
/// <param name="filetext"></param>
/// <param name="file_path">"SyntaxHighligher/com.html"</param>
private void writefiletext(string filetext,string file_path)
{
FileStream MyFileStream = new FileStream(file_path, FileMode.Create, FileAccess.Write);
StreamWriter htmlWriter = new StreamWriter(MyFileStream, System.Text.Encoding.UTF8);
htmlWriter.WriteLine(filetext);
htmlWriter.Close();
MyFileStream.Close();
}
转换人民币大写
public static string CmycurD(double num)
{
string str1 = "零壹贰叁肆伍陆柒捌玖"; //0-9所对应的汉字
string str2 = "万仟佰拾亿仟佰拾万仟佰拾元角分"; //数字位所对应的汉字
string str3 = ""; //从原num值中取出的值
string str4 = ""; //数字的字符串形式
string str5 = ""; //人民币大写金额形式
int i; //循环变量
int j; //num的值乘以100的字符串长度
string ch1 = ""; //数字的汉语读法
string ch2 = ""; //数字位的汉字读法
int nzero = 0; //用来计算连续的零值是几个
int temp; //从原num值中取出的值
num = Math.Round(Math.Abs(num), 2); //将num取绝对值并四舍五入取2位小数
str4 = (num * 100).ToString(); //将num乘100并转换成字符串形式
j = str4.Length; //找出最高位
if (j > 15) { return "溢出"; }
str2 = str2.Substring(15 - j); //取出对应位数的str2的值。如：200.55,j为5所以str2=佰拾元角分
//循环取出每一位需要转换的值
for (i = 0; i < j; i++)
{
str3 = str4.Substring(i, 1); //取出需转换的某一位的值
temp = Convert.ToInt32(str3); //转换为数字
if (i != (j - 3) && i != (j - 7) && i != (j - 11) && i != (j - 15))
{
//当所取位数不为元、万、亿、万亿上的数字时
if (str3 == "0")
{
ch1 = "";
ch2 = "";
nzero = nzero + 1;
if (i == (j - 2))//如果有"0角"则不显示零
{
nzero = 0;
}
}
else
{
if (str3 != "0" && nzero != 0) //如果是连续的0时
{
ch1 = "零" + str1.Substring(temp * 1, 1);
ch2 = str2.Substring(i, 1);
nzero = 0;
}
else
{
ch1 = str1.Substring(temp * 1, 1);
ch2 = str2.Substring(i, 1);
nzero = 0;
}
}
}
else
{
//该位是万亿，亿，万，元位等关键位
if (str3 != "0" && nzero != 0)//前面有零的除0之外的数
{
ch1 = "零" + str1.Substring(temp * 1, 1);
ch2 = str2.Substring(i, 1);
nzero = 0;
}
else //前面没零或 str3=0
{
if (str3 != "0" && nzero == 0) //值不是0时 前面没零只转换字符
{
ch1 = str1.Substring(temp * 1, 1);
ch2 = str2.Substring(i, 1);
nzero = 0;
}
else
{
if (str3 == "0" && nzero >= 3)
{
ch1 = "";
ch2 = "";
nzero = nzero + 1;
}
else
{
if (j >= 11)
{
ch1 = "";
nzero = nzero + 1;
}
else
{
ch1 = "";
ch2 = str2.Substring(i, 1);
nzero = nzero + 1;
}
}
}
}
}
if (i == (j - 11) || i == (j - 3) || i == (j - 7))
{
//如果该位是亿位万元或元位，则必须写上
ch2 = str2.Substring(i, 1);
}
str5 = str5 + ch1 + ch2;
if (i == j - 1 && str3 == "0")
{
//最后一位（分）为0时，加上“整”
str5 = str5 + '整';
}
}
if (num == 0)
{
str5 = "零元整";
}
return str5;
}
/**/
/// <summary>
/// 一个重载，将字符串先转换成数字在调用CmycurD(decimal num)
/// </summary>
/// <param name="num">用户输入的金额，字符串形式未转成decimal</param>
/// <returns></returns>
public static string CmycurD(string numstr)
{
try
{
double num = Convert.ToDouble(numstr);
return CmycurD(num);
}
catch
{
return "非数字形式！";
}
}
获取NTP的时间
static void Main(string[] args) { TimeSpan NTPtimeSpan = GetNetworkTime().Subtract(System.DateTime.Now); //返回本地与远程的时间间隔差 Console.WriteLine(DateTime.Now.Add(NTPtimeSpan)); //通过计算得出正确的本地时间 Console.ReadKey(); } public static DateTime GetNetworkTime() { //时间服务器地址 const string ntpServer = "time.asia.apple.com"; var addresses = Dns.GetHostEntry(ntpServer).AddressList; // NTP message size - 16 bytes of the digest (RFC 2030) var ntpData = new byte[48]; //Setting the Leap Indicator, Version Number and Mode values ntpData[0] = 0x1B; //LI = 0 (no warning), VN = 3 (IPv4 only), Mode = 3 (Client Mode) //The UDP port number assigned to NTP is 123 var ipEndPoint = new IPEndPoint(addresses[0], 123); //NTP uses UDP var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); socket.Connect(ipEndPoint); //Stops code hang if NTP is blocked socket.ReceiveTimeout = 3000; socket.Send(ntpData); socket.Receive(ntpData); socket.Close(); //Offset to get to the "Transmit Timestamp" field (time at which the reply //departed the server for the client, in 64-bit timestamp format." const byte serverReplyTime = 40; //Get the seconds part ulong intPart = BitConverter.ToUInt32(ntpData, serverReplyTime); //Get the seconds fraction ulong fractPart = BitConverter.ToUInt32(ntpData, serverReplyTime + 4); //Convert From big-endian to little-endian intPart = SwapEndianness(intPart); fractPart = SwapEndianness(fractPart); var milliseconds = (intPart * 1000) + ((fractPart * 1000) / 0x100000000L); //**UTC** time var networkDateTime = (new DateTime(1900, 1, 1, 0, 0, 0, DateTimeKind.Utc)).AddMilliseconds((long)milliseconds); return networkDateTime.ToLocalTime(); } // stackoverflow.com/a/3294698/162671 static uint SwapEndianness(ulong x) { return (uint)(((x & 0x000000ff) << 24) + ((x & 0x0000ff00) << 8) + ((x & 0x00ff0000) >> 8) + ((x & 0xff000000) >> 24)); }
打开文本的
private StreamReader OpenFile(string fileName)
{
if(File.Exists(fileName))
{
return new StreamReader(fileName);
}
return null;
}
