实现自定义IFormattable

来源：互联网发布：爱壁纸hd for mac 编辑：程序博客网时间：2024/04/28 05:02
using System;using System.Collections;using System.Linq;using System.Text;using System.Collections.Generic;using System.Runtime.Serialization;namespace TestCS{    //实现IFormattable    struct Vector:IFormattable    {        public double x, y, z;        public Vector(double a, double b, double c)        {            x = a; y = b; z = c;        }        #region IFormattable 成员        public string ToString(string format, IFormatProvider formatProvider)        {            switch (format.ToUpper())            {                case "N": return "||" + Norm().ToString() + "||";                case "VE": return string.Format("{0:E},{1:E},{2:E}", x, y, z);                case "IJK":                    StringBuilder sb = new StringBuilder(x.ToString(), 30);                    sb.AppendFormat(" i + ");                    sb.AppendFormat(y.ToString());                    sb.AppendFormat(" j + ");                    sb.AppendFormat(z.ToString());                    sb.AppendFormat(" k");                    return sb.ToString();                default:                    return ToString();            }                    }        private double  Norm()        {            return x * x + y * y + z * z;        }        #endregion    }    public class Progarm    {        public static void Main(string[] args)        {            //IFormatProvider表示要显示的变量            Vector v1 = new Vector(2.3, 44.24, -33.3);            Console.WriteLine("{0:N}", v1);            Console.WriteLine("{0:ve}", v1);            Console.WriteLine("{0:ijk}", v1);            Console.ReadLine();        }    }  }