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C# BitConverter.ToChar()用法及代碼示例


此方法用於返回從字節數組中指定位置的兩個字節轉換而來的Unicode字符。

用法:

public static char ToChar (byte[] value, int startIndex);

參數：


  • value:它是一個數組。
    startIndex:它是值內的起始位置。

返回值：此方法返回一個字符，該字符由從startIndex開始的兩個字節組成。

異常：

  • ArgumentException：如果startIndex等於值的長度減去1。
    ArgumentNullException：如果值一片空白。
    ArgumentOutOfRangeException：如果startIndex小於零或大於值的長度減1。

以下示例程序旨在說明BitConverter.ToChar(Byte []，Int32)方法的用法：

示例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(); 
} 
}

輸出：

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:對於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(); 
} 
}

輸出：

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:對於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(); 
} 
}

輸出：

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:對於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); 
        } 
    } 
}

輸出：

Exception Thrown: System.ArgumentNullException

參考：



相關用法


注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 C# | BitConverter.ToChar() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。