C# BitConverter.ToInt16()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16位有符號整數。

用法:

public static short ToInt16 (byte[] value, int startIndex);

參數：

value:它是一個字節數組。
startIndex:它是值內的起始位置。

返回值：此方法返回一個由兩個字節組成的16位帶符號整數，該整數從startIndex開始。

異常：

ArgumentException：如果startIndex等於值的長度減去1。
ArgumentNullException：如果值為空。
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.ToInt16(Byte []，Int32)方法的用法：

示例1:

// C# program to demonstrate 
// BitConverter.ToInt16(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 
        Console.WriteLine("index byte Array     short value"); 
        for (int index = 0; index < bytes.Length - 1; 
                                index = index + 2) { 
  
            short values = BitConverter.ToInt16(bytes, index); 
  
            Console.WriteLine(" {0}     {1}         {2}", 
            index, BitConverter.ToString(bytes, index, 2), 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(); 
} 
}

輸出：

Initial Array: 32 0 0 42 0 65 0 125 0 197 0 168 3 41 4 125 32 

index    byte Array     short value
  0        20-00         32
  2        00-2A         10752
  4        00-41         16640
  6        00-7D         32000
  8        00-C5         -15104
  10        00-A8         -22528
  12        03-29         10499
  14        04-7D         32004

示例2:對於ArgumentException

// C# program to demonstrate 
// BitConverter.ToInt16(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 
        Console.WriteLine("index element     short 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."); 
                short values = BitConverter.ToInt16(bytes, index); 
                Console.WriteLine(" {0}     {1}         {2}", 
                index, BitConverter.ToString(bytes, index, 2), values); 
            } 
            else { 
  
                short values = BitConverter.ToInt16(bytes, index); 
                Console.WriteLine(" {0}     {1}         {2}",  
                index, BitConverter.ToString(bytes, index, 2), 
                                                      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     short value
  1      00-00         0
  3      2A-00         42
  5      41-00         65
  7      7D-00         125
  9      C5-00         197
  11      A8-03         936
  13      29-04         1065

startIndex equals the length of value minus 1.
Exception Thrown: System.ArgumentException

示例3:對於ArgumentOutOfRangeException

// C# program to demonstrate 
// BitConverter.ToInt16(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 
            Console.WriteLine("index    element     short 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."); 
                    short values = BitConverter.ToInt16(bytes, index); 
                } 
                else { 
                    short values = BitConverter.ToInt16(bytes, index); 
                    Console.WriteLine("  {0}      {1}         {2}",  
                      index, BitConverter.ToString(bytes, index, 2), 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     short value
  0      20-00         32
  2      00-2A         10752
  4      00-41         16640
  6      00-7D         32000
  8      00-C5         -15104
  10      00-A8         -22528
  12      03-29         10499
  14      04-7D         32004

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.ToInt16(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 
  
            short values = BitConverter.ToInt16(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); 
        } 
    } 
}

輸出：

Exception Thrown: System.ArgumentNullException

參考：

https://docs.microsoft.com/en-us/dotnet/api/system.bitconverter.toint16?view=netframework-4.7.2

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.ToInt16() 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。