1.十进制转16进制
1 int number=10
2 string result=number.ToString("X2");
3 >>0A
4 //X2表示大写2位
2.字符串转数值类型
1 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
1 int data = int.Parse("a9", System.Globalization.NumberStyles.AllowHexSpecifier);//指示数值字符串标识16进制
2 或
3 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
1 string strNumber1 = "9.820E+05";
2 string strNumber2 = "1.009E-05";
3
4 double data1 = Convert.ToDouble(strNumber1);
5 double data2 = Convert.ToDouble(strNumber2)
4.16进制字符串转换为数值并按位比较
1 temp = strTemp.Substring(20, 2);
2 int number = int.Parse(strTemp, System.Globalization.NumberStyles.AllowHexSpecifier);
3 bool status=(number & 0x8000) == 0 ? false : true;
或者
1 char temp = Convert.ToChar(Data.Substring(4, 1));
2 if ((temp1 & 2) != 0)
3 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
1 string[] arr =["1","2"]; 2 List<int> intList = Array.ConvertAll<string,int>(arr,s=>int.Parse(s)).ToList();
6.保留两位小数
1 double a = 123456, b = 123456.1, c = 123456.12, d = 123456.123, e = 123456.126; 2 Console.WriteLine(a.ToString("N")); //123,456.00 3 Console.WriteLine(b.ToString("N")); //123,456.10 4 Console.WriteLine(c.ToString("N")); //123,456.12 5 Console.WriteLine(d.ToString("N")); //123,456.12 6 Console.WriteLine(e.ToString("N")); //123,456.13 7 Console.WriteLine(); 8 9 Console.WriteLine(a.ToString("N2")); //123,456.00 10 Console.WriteLine(b.ToString("N2")); //123,456.10 11 Console.WriteLine(c.ToString("N2")); //123,456.12 12 Console.WriteLine(d.ToString("N2")); //123,456.12 13 Console.WriteLine(e.ToString("N2")); //123,456.13 14 Console.WriteLine(); 15 16 Console.WriteLine(a.ToString("F2")); //123456.00 17 Console.WriteLine(b.ToString("F2")); //123456.10 18 Console.WriteLine(c.ToString("F2")); //123456.12 19 Console.WriteLine(d.ToString("F2")); //123456.12 20 Console.WriteLine(e.ToString("F2")); //123456.13 21 Console.WriteLine(); 22 23 Console.WriteLine(a.ToString("0.00")); //123456.00 24 Console.WriteLine(b.ToString("0.00")); //123456.10 25 Console.WriteLine(c.ToString("0.00")); //123456.12 26 Console.WriteLine(d.ToString("0.00")); //123456.12 27 Console.WriteLine(e.ToString("0.00")); //123456.13 28 Console.WriteLine(); 29 30 Console.WriteLine(a.ToString("G")); //123456 31 Console.WriteLine(b.ToString("G")); //123456.1 32 Console.WriteLine(c.ToString("G")); //123456.12 33 Console.WriteLine(d.ToString("G")); //123456.123 34 Console.WriteLine(e.ToString("G")); //123456.126 35 Console.WriteLine(); 36 37 //本地货币 38 Console.WriteLine(a.ToString("C")); //NT$123,456 39 Console.WriteLine(b.ToString("C")); //NT$123,456.1 40 Console.WriteLine(c.ToString("C")); //NT$123,456.12 41 Console.WriteLine(d.ToString("C")); //NT$123,456.123 42 Console.WriteLine(e.ToString("C")); //NT$123,456.126 43 Console.WriteLine(); 44 Console.Read();