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C# | BitConverter。ToDouble()方法
C# | BitConverter。ToDouble()方法
原文:https://www . geesforgeks . org/c-sharp-bit converter-to double-method/
BitConverter。ToDouble()方法用于返回字节数组中指定位置的八个字节转换而来的双精度浮点数。
语法:
public static double ToDouble (byte[] value, int startIndex);
参数:
值:是字节数组。 起始指数:是数值内的起始位置。
返回值:这个方法返回一个从 startIndex 开始的 8 个字节组成的双精度浮点数。
异常:
- 参数异常:如果 startIndex 大于或等于值的长度减 7，并且小于或等于值的长度减 1。
- ArgumentNullException: 如果值为空。
- argumentoutofrangerexception:如果 startIndex 小于零或大于值的长度减 1。
以下程序说明了位转换器的使用。ToDouble(Byte[]，Int32) 方法:
例 1:
// C# program to demonstrate
// BitConverter.ToDouble(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = {0,0,1,2,7,126,78,55,
255,78,45,198,200,1,
1,1,1,255,255,2,4,4,
77,77,77,77,77,0,1};
// Display the values of the myArr.
Console.WriteLine("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
Console.WriteLine("index Array elements "+
" double values");
Console.WriteLine();
// getting double value and Display it
for (int index = 0; index < bytes.Length - 7;
index = index + 8) {
double values = BitConverter.ToDouble(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 8), values);
}
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(byte[] myArr)
{
int count = 0;
for (int i = 0; i < myArr.Length; i++) {
if (count == 18) {
Console.WriteLine();
Console.Write("{0} ", myArr[i]);
count = 0;
}
else {
Console.Write("{0} ", myArr[i]);
count++;
}
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array:
0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255
255 2 4 4 77 77 77 77 77 0 1
index Array elements double values
0 00-00-01-02-07-7E-4E-37 2.73464354303054E-42
8 FF-4E-2D-C6-C8-01-01-01 7.74999325882041E-304
16 01-FF-FF-02-04-04-4D-4D 2.38727219494443E+64
示例 2: 适用于参数异常
// C# program to demonstrate
// BitConverter.ToDouble(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = {0,0,1,2,7,126,78,55,
255,78,45,198,200,1,
1,1,1,255,255,2,4,4,
77,77,77,77,77,0,1,
0,0,1,2,7,126,78,55,
255,78,45,198,200,1,
1,1,1,255,255,2,4,4,
255,255,255,255,245,
245,245,245,245,245,
245,245,245,245,0,0,
0,0,0,0,0,0,6,5,6,56,
31,31,31,54,23,253,};
// Display the values of the myArr.
Console.WriteLine("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
Console.WriteLine("index Array elements"+
" double values");
Console.WriteLine();
// getting double value and Display it
for (int index = 4; index < bytes.Length - 6;
index = index + 8) {
if (index == bytes.Length - 7) {
Console.WriteLine();
Console.WriteLine("startIndex is equal to"+
" the length of bytes minus 7");
double values = BitConverter.ToDouble(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), values);
}
else {
double values = BitConverter.ToDouble(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes, index,
8), values);
}
}
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(byte[] myArr)
{
int count = 0;
for (int i = 0; i < myArr.Length; i++) {
if (count == 18) {
Console.WriteLine();
Console.Write("{0} ", myArr[i]);
count = 0;
}
else {
Console.Write("{0} ", myArr[i]);
count++;
}
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array:
0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255
255 2 4 4 77 77 77 77 77 0 1 0 0 1 2 7 126 78 55
255 78 45 198 200 1 1 1 1 255 255 2 4 4 255 255 255 255 245
245 245 245 245 245 245 245 245 245 0 0 0 0 0 0 0 0 6 5
6 56 31 31 31 54 23 253
index Array elements double values
4 07-7E-4E-37-FF-4E-2D-C6 -1.16103254047091E+30
12 C8-01-01-01-01-FF-FF-02 3.13113229681351E-294
20 04-04-4D-4D-4D-4D-4D-00 3.25995134720157E-307
28 01-00-00-01-02-07-7E-4E 1.29525825666467E+70
36 37-FF-4E-2D-C6-C8-01-01 8.10420695824091E-304
44 01-01-FF-FF-02-04-04-FF -6.86302832487538E+303
52 FF-FF-FF-F5-F5-F5-F5-F5 -1.68827860814431E+260
60 F5-F5-F5-F5-F5-00-00-00 5.21927749055768E-312
68 00-00-00-00-00-06-05-06 1.15818454395586E-279
startIndex is equal to the length of bytes minus 7
Exception Thrown: System.ArgumentException
例 3: 为argumentout of range exception
// C# program to demonstrate
// BitConverter.ToDouble(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = {0,0,1,2,7,126,78,55,
255,78,45,198,200,1,
1,1,1,255,255,2,4,4,
77,77,77,77,77,0,1,
0,0,1,2,7,126,78,55,
255,78,45,198,200,1,
1,1,1,255,255,2,4,4,
255,255,255,255,245,
245,245,245,245,245,
245,245,245,245,0,0,
0,0,0,0,0,0,6,5,6,56,
31,31,31,54,23,253,};
// Display the values of the myArr.
Console.WriteLine("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// getting double value and Display it
Console.WriteLine("startIndex is less than zero");
double values = BitConverter.ToDouble(bytes, -1);
Console.WriteLine(" {0} {1} {2}", -1,
BitConverter.ToString(bytes, -1, 8),
values);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(byte[] myArr)
{
int count = 0;
for (int i = 0; i < myArr.Length; i++) {
if (count == 18) {
Console.WriteLine();
Console.Write("{0} ", myArr[i]);
count = 0;
}
else {
Console.Write("{0} ", myArr[i]);
count++;
}
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array:
0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255
255 2 4 4 77 77 77 77 77 0 1 0 0 1 2 7 126 78 55
255 78 45 198 200 1 1 1 1 255 255 2 4 4 255 255 255 255 245
245 245 245 245 245 245 245 245 245 0 0 0 0 0 0 0 0 6 5
6 56 31 31 31 54 23 253
startIndex is less than zero
Exception Thrown: System.ArgumentOutOfRangeException
示例 4: 适用于参数异常
// C# program to demonstrate
// BitConverter.ToDouble(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = null;
// getting double value and Display it
Console.WriteLine("array bytes is null");
double values = BitConverter.ToDouble(bytes, 0);
Console.WriteLine(" {0} {1} {2}", 0,
BitConverter.ToString(bytes, 0, 8), values);
}
catch (ArgumentNullException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentOutOfRangeException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
catch (ArgumentException e) {
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
// Defining the method
// PrintIndexAndValues
public static void PrintIndexAndValues(byte[] myArr)
{
int count = 0;
for (int i = 0; i < myArr.Length; i++) {
if (count == 18) {
Console.WriteLine();
Console.Write("{0} ", myArr[i]);
count = 0;
}
else {
Console.Write("{0} ", myArr[i]);
count++;
}
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
array bytes is null
Exception Thrown: System.ArgumentNullException
参考:
- https://docs . Microsoft . com/en-us/dotnet/API/system . bit converter . to double？视图=netframework-4.7.2
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