//按照四舍五入的國(guó)際標(biāo)準(zhǔn)
string p1 = (Math.Round(0.333367, 4)*100).ToString() + "%";//33.34%
double dbdata = Math.Round((double)1 / (double)3, 5) * 100;//33.333
string p2 = String.Format("{0:F}", dbdata) + "%";//默認(rèn)為保留兩位

//保證分母為double
double t = Math.Round(1.0 / 3, 5) * 100;//33.33
double tt = Math.Round(1.0 / 3.0, 5) * 100;//33.333
//m代表decimal.
decimal res = 100m / 1000;//0.1

//保留為整數(shù)
double ttt = Math.Round(1.0 / 3.0, 0);//0

int a = 10 % 3;//取余數(shù)

//1.字節(jié)轉(zhuǎn)換
float m = 5f;
var btValue = BitConverter.GetBytes(m).Reverse().ToArray();
//轉(zhuǎn)為原值字符串
string m1 = System.Text.Encoding.Default.GetString(btValue);

//2.byte 數(shù)組合并
byte[] data = new byte[10];
byte[] counts = new byte[3];
byte[] ndata = new byte[data.Length + counts.Length];
//將data復(fù)制到ndata
data.CopyTo(ndata, 0);//從ndata的下標(biāo)為0的地方開(kāi)始存放
counts.CopyTo(ndata, data.Length);

//3.string和byte[]轉(zhuǎn)換
string str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//string轉(zhuǎn)byte[]:
byte[] byteArray1 = System.Text.Encoding.Default.GetBytes(str);
//byte[] 轉(zhuǎn)string：
string str1 = System.Text.Encoding.Default.GetString(byteArray1);
//string轉(zhuǎn)ASCII byte[]:
byte[] byteArray2 = System.Text.Encoding.ASCII.GetBytes(str);
//ASCII byte[] 轉(zhuǎn)string:
string str2 = System.Text.Encoding.ASCII.GetString(byteArray2);

//4.字符串拆分?jǐn)?shù)組
string a = "A|B|C|D";
string[] a1 = a.Split('|');

//5.Int轉(zhuǎn)為16進(jìn)制
int b = 58;
byte b1 = Convert.ToByte(b);

//6.byte數(shù)組截取
byte[] test = byteArray2.Skip(4).Take(3).ToArray();//從下標(biāo)4開(kāi)始截取長(zhǎng)度3

//7.List轉(zhuǎn)為Byte[]
List<byte> frameBytes = new List<byte>();
frameBytes.Add(0x9E);
byte[] phoneNumByte = new byte[] { 0x01, 0x03, 0x05, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00 };//定義一個(gè)數(shù)組        
for (int i = 0; i < phoneNumByte.Length; i++)
{
    frameBytes.Add(phoneNumByte[i]);
}
frameBytes = frameBytes.Concat(byteArray2).ToList<byte>();//兩個(gè)list合并
//list轉(zhuǎn)byte[]
byte[] transByte = frameBytes.ToArray();
//byte[]轉(zhuǎn)list
List<byte> lb =transByte.ToList();