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。
句法：
public static char ToChar (byte[] value, int startIndex);参数：
value: It is an array.
startIndex: it is the starting position within value.
返回值：该方法返回一个字符，该字符由从startIndex开始的两个字节组成。
例外情况：
ArgumentException: If the startIndex equals the length of value minus 1.
ArgumentNullException: If the value is null.
ArgumentOutOfRangeException: If the startIndex is less than zero or greater than the length of value minus 1.
下面的程序说明了BitConverter.ToChar(Byte []，Int32)方法的用法：
范例1：
// 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("intial 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
intial 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 ?
示例2：对于ArgumentException
// 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("intial 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
intial 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
示例3：对于ArgumentOutOfRangeException
// 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("intial 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
intial 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
示例4：对于ArgumentNullException
// 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/zh-cn/dotnet/api/system.bitconverter.tochar?view=netframework-4.7.2