基本信息

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文档摘要

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常用类相信一切都有可能

常用类Agenda

万事万物皆对象int－Int32long-Int64delegate-Delegatestring-Stringobject-Object

ObjectObject是所有类的基类装箱与拆箱

PointstructPoint{ publicintX; publicintY; publicPoint(){} publicPoint(intx,inty){this.X=x;this.Y=y;}}

SizeStructSize{ publicintHeight; publicintWidth;}

RectanglestructRectangle{ publicPointPoint;

publicSizeSize; publicRectangle(){} publicRectangle(Pointpoint,Sizesize){this.Point=point;this.Size=size;} publicRectangle(intx,inty,intwidth,intheight):this(newPoint(x,y),newSize(width,height)){}}

RandomNext();10~100的随机数30%的概率67.53%Next(10000)6753

Math

Stringchar的数组LengthIndexOfLastIndexOfSubstringToUperToLower

Demo字数统计；不统计空字符。Char.IsWhiteSpace（）；查找所有的XX，indexOf数据提取

QandA

ThankU