C#字符串操纵总结

1、 Console.WriteLine(val.ToString(E;/displays 3.141593E+000 Console.WriteLine(val.ToString(F3;/displays 3.142 int val=65535; Console.WriteLine(val.ToString(x; /displays ffff Console.WriteLine(val.ToString(X; /displays FFFF Single val=0.123F; Console.WriteLine(val.ToString(p; /displays 12.30 % Console.

2、WriteLine(val.ToString(p1; /displays 12.3 % 默认格式化会在数字和百分号之间放入一个空格。定制方法如下： 其中 NumberFormatInfo 类是 System.Globalization 命名空间的一个成员， 因此 该命名空间必须导入到程序中。 Single val=0.123F; object myobj=NumberFormatInfo.CurrentInfo.Clone( as NumberFormatInfo; NumberFormatInfo myformat=myobj as NumberFormatInfo; myformat.Pe

3、rcentPositivePattern=1; Console.WriteLine(val.ToString(p,myformat; /displays 12.30%; Console.WriteLine(val.ToString(p1,myformat; /displays 12.3%; 格式化具有很大的灵活性。下面的例子演示一个没有意义的货币结构： double val=1234567.89; int groupsize=2,1,3; object myobj=NumberFormatInfo.CurrentInfo.Clone( ; NumberFormatInfo mycurrency

4、=myobj as NumberFormatInfo; mycurrency.CurrencySymbol=#; /符号 mycurrency.CurrencyDecimalSeparator=:; /小数点 mycurrency.CurrencyGroupSeparator=_; /分隔符 mycurrency.CurrencyGroupSizes=groupsize; / 输出 #1_234_5_67:89 Console.WriteLine(val.ToString(C,mycurrency; 13.2 格式化日期 输出形式取决于用户计算机的文化设置。 using System; usi

5、ng System.Globalization; public class MainClass public static void Main(string args DateTime dt = DateTime.Now; String format = d,D,f,F,g,G,m,r,s,t, T,u, U,y,dddd, MMMM dd yyyy,ddd, MMM d yy,dddd, MMMM dd,M/yy,dd-MM-yy,; String date; for (int i = 0; i format.Length; i+ date = dt.ToString(formati, Da

6、teTimeFormatInfo.InvariantInfo; Console.WriteLine(String.Concat(formati, : , date; d :07/11/2004 =输出 D :Sunday, 11 July 2004 f :Sunday, 11 July 2004 10:52 F :Sunday, 11 July 2004 10:52:36 g :07/11/2004 10:52 G :07/11/2004 10:52:36 m :July 11 r :Sun, 11 Jul 2004 10:52:36 GMT s :2004-07-11T10:52:36 t

7、:10:52 T :10:52:36 u :2004-07-11 10:52:36Z U :Sunday, 11 July 2004 02:52:36 y :2004 July dddd, MMMM dd yyyy :Sunday, July 11 2004 ddd, MMM d yy :Sun, Jul 11 04 dddd, MMMM dd :Sunday, July 11 M/yy :7/04 dd-MM-yy :11-07-04 13.3 格式化枚举 enum classmen ynn=1, yly=2, css=3, C+=4 获取枚举字符串信息如下： classmen myclassmen=classmen.yly; Console.WriteLine(myclassmen.ToString( ; /displays yly Console.WriteLine(myclassmen.ToString(d; /displays 2 从系统枚举中获取文本人信息如下： DayOfWeek