C#学习日记 BitArray BitVector32

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BitArray类可以重新设置大小，事先不知道大小的可以用它，它可以包含很多位。它是引用类型的。位里存储的是bool类型，有Not Or And Xor 方法。

using System;using System.Collections;namespace Sample{public class MainEntryPoint{static int Main(string[] args){var bits1 = new BitArray(8);bits1.SetAll(true);bits1.Set(1, false);bits1[5] = false;bits1[7] = false;Console.Write("initialized: ");DisplayBits(bits1);Console.WriteLine();Console.Write("not ");DisplayBits(bits1);bits1.Not();Console.Write(" = ");DisplayBits(bits1);Console.WriteLine();var bits2 = new BitArray(bits1);bits2[0] = true;bits2[1] = false;bits2[4] = true;DisplayBits(bits1);Console.Write(" or ");DisplayBits(bits2);Console.Write(" = ");bits1.Or(bits2);DisplayBits(bits1);Console.WriteLine();DisplayBits(bits2);Console.Write(" and ");DisplayBits(bits1);Console.Write(" = ");bits2.And(bits1);DisplayBits(bits2);Console.WriteLine();DisplayBits(bits1);Console.Write(" xor ");DisplayBits(bits2);Console.Write(" = ");bits1.Xor(bits2);DisplayBits(bits1);return 0;}static void DisplayBits(BitArray bits){foreach(bool bit in bits){Console.Write(bit ? 1: 0);}}}}

BitVector结构是基于栈的，速度非常快，只能存储32位，存在一个整数里。section能选择片段的位置长度。

using System;using System.Collections.Specialized;using System.Text;namespace Sample{public class MainEntryPoint{static int Main(string[] args){int received = 0x79abcdef;BitVector32 bits = new BitVector32(received);BitVector32.Section sectionA = BitVector32.CreateSection(0xfff);BitVector32.Section sectionB = BitVector32.CreateSection(0xff, sectionA);BitVector32.Section sectionC = BitVector32.CreateSection(0x7, sectionB);BitVector32.Section sectionD = BitVector32.CreateSection(0x7, sectionC);BitVector32.Section sectionE = BitVector32.CreateSection(0x3, sectionD);Console.WriteLine("SectionA: {0}",IntToBinaryString(bits[sectionA], true));Console.WriteLine("SectionB: {0}",IntToBinaryString(bits[sectionB], true));Console.WriteLine("SectionC: {0}",IntToBinaryString(bits[sectionC], true));Console.WriteLine("SectionD: {0}",IntToBinaryString(bits[sectionD], true));Console.WriteLine("SectionE: {0}",IntToBinaryString(bits[sectionE], true));return 0;}static string IntToBinaryString(int bits, bool removeTrailingZero){var sb =new StringBuilder(32);for(int i = 0 ; i < 32; i++){if((bits & 0x80000000) != 0){sb.Append("1");}else{sb.Append("0");}bits = bits << 1;}string s = sb.ToString();if(removeTrailingZero){return s.TrimStart('0');}else{return s;}}}}

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