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C# | BitConverter。ToChar()方法
C# | BitConverter。ToChar()方法
原文:https://www . geesforgeks . org/c-sharp-bit converter-to char-method/
此方法用于返回从字节数组中指定位置的两个字节转换而来的 Unicode 字符。 语法:
public static char ToChar (byte[] value, int startIndex);
参数:
值:是数组。 startIndex: 是数值内的起始位置。
返回值:这个方法返回一个由两个字节组成的字符，从开始索引开始。 例外:
参数异常:如果开始索引等于值的长度减 1。 参数空异常: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。ToChar(Byte[]，Int32) 方法: 例 1:
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate
// BitConverter.ToChar(Byte[], Int32);
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = { 32, 0, 0, 42, 0, 65, 0, 125, 0,
197, 0, 168, 3, 41, 4, 125, 32 };
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
for (int index = 1; index < bytes.Length - 1;
index = index + 2) {
char values = BitConverter.ToChar(bytes, index);
Console.WriteLine("index element char");
Console.WriteLine(" {0} {1} {2}",
index, bytes[index], 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();
Console.WriteLine("initial Array in string: {0} ",
BitConverter.ToString(myArr));
Console.WriteLine();
}
}
输出:
Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32
initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D-20
index element char
1 0
index element char
3 42 *
index element char
5 65 A
index element char
7 125 }
index element char
9 197 ?
index element char
11 168 ?
index element char
13 41 ?
index element char
15 125 ?
例 2: 为议论文异常为
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate
// BitConverter.ToChar(Byte[], Int32);
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = { 32, 0, 0, 42, 0, 65, 0, 125, 0,
197, 0, 168, 3, 41, 4, 125 };
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
for (int index = 1; index < bytes.Length;
index = index + 2) {
if (index == bytes.Length - 1) {
Console.WriteLine();
Console.WriteLine("startIndex equals the "+
"length of value minus 1.");
char values = BitConverter.ToChar(bytes, index);
}
else {
char values = BitConverter.ToChar(bytes, index);
Console.WriteLine("index element char");
Console.WriteLine(" {0} {1} {2}",
index, bytes[index], 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();
Console.WriteLine("initial Array in string: {0} ",
BitConverter.ToString(myArr));
Console.WriteLine();
}
}
输出:
Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125
initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D
index element char
1 0
index element char
3 42 *
index element char
5 65 A
index element char
7 125 }
index element char
9 197 ?
index element char
11 168 ?
index element char
13 41 ?
startIndex equals the length of value minus 1.
Exception Thrown: System.ArgumentException
例 3: 为argumentout of rangeexception为
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate
// BitConverter.ToChar(Byte[], Int32);
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = { 32, 0, 0, 42, 0, 65, 0, 125, 0,
197, 0, 168, 3, 41, 4, 125 };
// Display the values of the myArr.
Console.Write("Initial Array: ");
// calling the PrintIndexAndValues()
// method to print
PrintIndexAndValues(bytes);
// print char value
for (int index = 0; index < bytes.Length + 1;
index = index + 2) {
if (index == bytes.Length) {
Console.WriteLine();
Console.WriteLine("startIndex is greater than "+
"the length of value minus 1.");
char values = BitConverter.ToChar(bytes, index);
}
else {
char values = BitConverter.ToChar(bytes, index);
Console.WriteLine("index element char");
Console.WriteLine(" {0} {1} {2}",
index, bytes[index], 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();
Console.WriteLine("initial Array in string: {0} ",
BitConverter.ToString(myArr));
Console.WriteLine();
}
}
输出:
Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125
initial Array in string: 20-00-00-2A-00-41-00-7D-00-C5-00-A8-03-29-04-7D
index element char
0 32
index element char
2 0 ?
index element char
4 0 ?
index element char
6 0 ?
index element char
8 0 ?
index element char
10 0 ?
index element char
12 3 ?
index element char
14 4 ?
startIndex is greater than the length of value minus 1.
Exception Thrown: System.ArgumentOutOfRangeException
例 4: 为 ArgumentNullException 为
c sharp . c sharp . c sharp . c sharp
// C# program to demonstrate
// BitConverter.ToChar(Byte[], Int32);
// Method
using System;
class GFG {
// Main Method
public static void Main()
{
try {
// Define an array of byte values.
byte[] bytes = null;
// get the char value
char values = BitConverter.ToChar(bytes, 0);
}
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:
- https://docs . Microsoft . com/en-us/dotnet/API/system . bit converter . tochar？视图=netframework-4.7.2
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