C# BitConverter.ToInt32()用法及代碼示例

BitConverter.ToInt32(Byte []，Int32)方法用於返回一個32位有符號整數，該整數從字節數組中指定位置的四個字節轉換而來。

用法:

public static int ToInt32 (byte[] value, int startIndex);

參數：

value: It is an array of bytes.
startIndex: It is the starting position within the value.

返回值：此方法返回一個由兩個字節組成的32位帶符號整數，該字節從startIndex開始。

異常：

ArgumentException：如果startIndex大於或等於值的長度減去3，並且小於或等於值的長度減去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.ToInt32(Byte []，Int32)方法的用法：

示例1:

// C# program to demonstrate 
// BitConverter.ToInt32(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           int value"); 
        for (int index = 0; index < bytes.Length - 3; 
                              index = index + 4) { 
  
            int values = BitConverter.ToInt16(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(); 
} 
}

輸出：

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

index      byte Array       int value
  0        20-00-00-2A         32
  4        00-41-00-7D         16640
  8        00-C5-00-A8         -15104
  12        03-29-04-7D         10499

示例2:對於ArgumentException

// C# program to demonstrate 
// BitConverter.ToInt32(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          int value"); 
        for (int index = 1; index < bytes.Length - 2; 
                                 index = index + 4) { 
  
            if (index == bytes.Length - 3) { 
                Console.WriteLine(); 
                Console.WriteLine("startIndex equals the "+ 
                               "length of value minus 3."); 
                int values = BitConverter.ToInt32(bytes, index); 
                Console.WriteLine("  {0}      {1}         {2}", 
                 index, BitConverter.ToString(bytes, index, 4), values); 
            } 
            else { 
                int values = BitConverter.ToInt32(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(); 
    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          int value
  1      00-00-2A-00         2752512
  5      41-00-7D-00         8192065
  9      C5-00-A8-03         61341893

startIndex equals the length of value minus 3.
Exception Thrown: System.ArgumentException

示例3:對於ArgumentOutOfRangeException

// C# program to demonstrate 
// BitConverter.ToInt32(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          int value"); 
          
        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 value minus 1"); 
                int values = BitConverter.ToInt32(bytes, index); 
                Console.WriteLine("  {0}      {1}         {2}", 
                 index, BitConverter.ToString(bytes, index, 4), values); 
            } 
            else { 
                int values = BitConverter.ToInt32(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(); 
    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          int value
  0      20-00-00-2A         704643104
  4      00-41-00-7D         2097168640
  8      00-C5-00-A8         -1476344576
  12      03-29-04-7D         2097424643

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.ToInt32(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 int value 
  
        int values = BitConverter.ToInt32(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.toint32?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.ToInt32() 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。