C#值数值类型转换

1.十进制转16进制

int number=10
string result=number.ToString("X2");
>>0A
//X2表示大写2位

2.字符串转数值类型

int data = int.Parse("99");

3.16进制的字符串转数值类型

注：16进制字符串不能直接转换，因为无法识别当中的字符a~f

int data = int.Parse("a9", System.Globalization.NumberStyles.AllowHexSpecifier);//指示数值字符串标识16进制
或
int data = Convert.ToInt16("a9", 16);

3.科学计数转换为数值类型

将 "9.820E+05" 与 "1.009E-05"转换为数值类型，直接 使用 Convert.ToDouble 的方法

 string strNumber1 = "9.820E+05";
 string strNumber2 = "1.009E-05";
 
 double data1 = Convert.ToDouble(strNumber1);            
 double data2 = Convert.ToDouble(strNumber2)

4.16进制字符串转换为数值并按位比较

temp = strTemp.Substring(20, 2);
int number = int.Parse(strTemp, System.Globalization.NumberStyles.AllowHexSpecifier);
bool status=(number & 0x8000) == 0 ? false : true;

 或者

    char temp = Convert.ToChar(Data.Substring(4, 1));  
    if ((temp1 & 2) != 0)
        result += "第3个字节的高四位为0010";

5.List数组转换

List<decimal> prices = t.Split(',').Select(n => decimal.Parse(n, style)).ToList();

或者

 string[] arr =["1","2"];
 List<int> intList = Array.ConvertAll<string,int>(arr,s=>int.Parse(s)).ToList();

6.保留两位小数

    double a = 123456, b = 123456.1, c = 123456.12, d = 123456.123, e = 123456.126;
    Console.WriteLine(a.ToString("N"));  //123,456.00
    Console.WriteLine(b.ToString("N"));  //123,456.10
    Console.WriteLine(c.ToString("N"));  //123,456.12
    Console.WriteLine(d.ToString("N"));  //123,456.12
    Console.WriteLine(e.ToString("N"));  //123,456.13
    Console.WriteLine();

    Console.WriteLine(a.ToString("N2"));  //123,456.00
    Console.WriteLine(b.ToString("N2"));  //123,456.10
    Console.WriteLine(c.ToString("N2"));  //123,456.12
    Console.WriteLine(d.ToString("N2"));  //123,456.12
    Console.WriteLine(e.ToString("N2"));  //123,456.13
    Console.WriteLine();

    Console.WriteLine(a.ToString("F2"));  //123456.00
    Console.WriteLine(b.ToString("F2"));  //123456.10
    Console.WriteLine(c.ToString("F2"));  //123456.12
    Console.WriteLine(d.ToString("F2"));  //123456.12
    Console.WriteLine(e.ToString("F2"));  //123456.13
    Console.WriteLine();

    Console.WriteLine(a.ToString("0.00"));  //123456.00
    Console.WriteLine(b.ToString("0.00"));  //123456.10
    Console.WriteLine(c.ToString("0.00"));  //123456.12
    Console.WriteLine(d.ToString("0.00"));  //123456.12
    Console.WriteLine(e.ToString("0.00"));  //123456.13
    Console.WriteLine();

    Console.WriteLine(a.ToString("G"));  //123456
    Console.WriteLine(b.ToString("G"));  //123456.1
    Console.WriteLine(c.ToString("G"));  //123456.12
    Console.WriteLine(d.ToString("G"));  //123456.123
    Console.WriteLine(e.ToString("G"));  //123456.126
    Console.WriteLine();

    //本地货币
    Console.WriteLine(a.ToString("C"));  //NT$123,456
    Console.WriteLine(b.ToString("C"));  //NT$123,456.1
    Console.WriteLine(c.ToString("C"));  //NT$123,456.12
    Console.WriteLine(d.ToString("C"));  //NT$123,456.123
    Console.WriteLine(e.ToString("C"));  //NT$123,456.126
    Console.WriteLine();
    Console.Read();