C# | BitConverter。ToSingle()方法
原文:https://www . geesforgeks . org/c-sharp-bit converter-to single-method/
此方法用于返回从字节数组中指定位置的四个字节转换而来的单精度浮点数。
语法:
public static float ToSingle (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:这个方法返回一个单精度浮点数，由 startIndex 开始的四个字节组成。
异常:
- 参数异常:如果起始索引大于或等于值的长度减 3，小于或等于值的长度减 1。
- ArgumentNullException: 如果值为空。
- ArgumentOutOfRangeException: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。ToSingle(Byte[]，Int32) 方法:
例 1:
// C# program to demonstrate
// BitConverter.ToSingle(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = {0, 128, 63, 0, 0,
112, 65, 0, 255,
127, 71, 0, 0,
128, 59, 0, 0,
128, 47, 73, 70,
131, 5, 75, 6,
158, 63};
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
Console.WriteLine("index Array elements float values");
Console.WriteLine();
// getting float value and Display it
for (int index = 0; index < bytes.Length - 3;
index = index + 4) {
float values = BitConverter.ToSingle(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), 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)
{
for (int i = 0; i < myArr.Length; i++) {
Console.Write("{0} ", myArr[i]);
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array: 0 128 63 0 0 112 65 0 255 127 71 0 0 128 59 0 0 128 47 73 70 131 5 75 6 158 63
index Array elements float values
0 00-80-3F-00 5.831554E-39
4 00-70-41-00 6.009485E-39
8 FF-7F-47-00 6.566237E-39
12 00-80-3B-00 5.464212E-39
16 00-80-2F-49 718848
20 46-83-05-4B 8749894
示例 2: 适用于参数异常
// C# program to demonstrate
// BitConverter.ToSingle(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes ={0, 128, 63, 0, 0,
112, 65, 0, 255,
127, 71, 0, 0,
128, 59, 0, 0,
128, 47, 73, 70,
131, 5, 75, 6,
158, 63};
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
Console.WriteLine("index Array elements"+
" float values");
Console.WriteLine();
// getting float value and Display it
for (int index = 0; index < bytes.Length - 2;
index = index + 4) {
if (index == bytes.Length - 3) {
Console.WriteLine();
Console.WriteLine("startIndex is equal to"+
" the length of bytes minus 3");
float values = BitConverter.ToSingle(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), values);
}
else {
float values = BitConverter.ToSingle(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), 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)
{
for (int i = 0; i < myArr.Length; i++) {
Console.Write("{0} ", myArr[i]);
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array: 0 128 63 0 0 112 65 0 255 127 71 0 0 128 59 0 0 128 47 73 70 131 5 75 6 158 63
index Array elements float values
0 00-80-3F-00 5.831554E-39
4 00-70-41-00 6.009485E-39
8 FF-7F-47-00 6.566237E-39
12 00-80-3B-00 5.464212E-39
16 00-80-2F-49 718848
20 46-83-05-4B 8749894
startIndex is equal to the length of bytes minus 3
Exception Thrown: System.ArgumentException
例 3: 为argumentout of range exception
// C# program to demonstrate
// BitConverter.ToSingle(Byte[], Int32)
// Method
using System;
using System.Collections.Generic;
public class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = {0, 128, 63, 0, 0, 112, 65,
0, 255, 127, 71, 0, 0, 128,
59, 0, 0, 128, 47, 73, 70,
131, 5, 75, 6, 158, 63, 24};
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
Console.WriteLine("index Array elements float values");
Console.WriteLine();
// getting float value and Display it
for (int index = 0; index < bytes.Length + 1;
index = index + 4) {
if (index == bytes.Length) {
Console.WriteLine();
Console.WriteLine("startIndex is greater than "+
"the length of bytes minus 1.");
float values = BitConverter.ToSingle(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), values);
}
else {
float values = BitConverter.ToSingle(bytes, index);
Console.WriteLine(" {0} {1} {2}",
index, BitConverter.ToString(bytes,
index, 4), 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)
{
for (int i = 0; i < myArr.Length; i++) {
Console.Write("{0} ", myArr[i]);
}
Console.WriteLine();
Console.WriteLine();
}
}
输出:
Initial Array: 0 128 63 0 0 112 65 0 255 127 71 0
0 128 59 0 0 128 47 73 70 131 5 75
6 158 63 24
index Array elements float values
0 00-80-3F-00 5.831554E-39
4 00-70-41-00 6.009485E-39
8 FF-7F-47-00 6.566237E-39
12 00-80-3B-00 5.464212E-39
16 00-80-2F-49 718848
20 46-83-05-4B 8749894
24 06-9E-3F-18 2.476595E-24
startIndex is greater than the length of bytes minus 1.
Exception Thrown: System.ArgumentOutOfRangeException
示例 4: 适用于参数异常
// C# program to demonstrate
// BitConverter.ToSingle(Byte[], Int32)
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte
// values with null value
byte[] bytes = null;
// getting the float value
float values = BitConverter.ToSingle(bytes, 0);
Console.Write("{0}", 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);
}
}
}
输出:
Exception Thrown: System.ArgumentNullException
参考:
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