qq_42353026的博客

接口 interface ICalculate { double Add(double num1,double num2); double Minus(double num1,double num2); }实现类 public class Calculation:ICalculate { double num1; double num2; public Calculation(double num1,double num2) .

public static string GetIP(){ IPAddress ip = null; try{ ip = Dns.GetHostEntry(Dns.GetHostName()).First(e=>e.AddressFamily==AddressFamily.InterNetwork); //IPAddress[] ips = Dns.GetHostEntry(D...

10.10025100.ToString(“0.00000”)//保留小数点后五位Math.Round(10.10025100,5);//保留小数点后五位

检查自己编写的SQL语句里的参数命名是否是SQLserver里的关键字，建议把自己编写的SQL语句先在SQL上运行一下，看是否能运行进行对数据库操作时，参数类型必须是SqlParameter,SqlParameter[] param = {new SqlParameter("@pageCount",SqlDbType.Int),new SqlParameter("@StartInd...