C# | BitConverter.ToInt32() Method - GeeksforGeeks

19 May, 2021
BitConverter.ToInt32(Byte[], Int32) Method is used to return a 32-bit signed integer converted from four bytes at a specified position in a byte array.Syntax:  
public static int ToInt32 (byte[] value, int startIndex);
Parameters: 
value: It is an array of bytes. startIndex: It is the starting position within the value.  
Return Value: This method returns a 32-bit signed integer formed by two bytes beginning at startIndex.Exceptions:  
ArgumentException: If the startIndex is greater than or equal to the length of value minus 3, and is less than or equal to 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.
Below programs illustrate the use of BitConverter.ToInt32(Byte[], Int32) Method:Example 1: 
CSHARP
// C# program to demonstrate// BitConverter.ToInt32(Byte[], Int32);// Methodusing System; class GFG { // Main Methodpublic 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// PrintIndexAndValuespublic static void PrintIndexAndValues(byte[] myArr){    for (int i = 0; i < myArr.Length; i++) {         Console.Write("{0} ", myArr[i]);    }     Console.WriteLine();    Console.WriteLine();}}
Output:  
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
Example 2: For ArgumentException 
CSHARP
// C# program to demonstrate// BitConverter.ToInt32(Byte[], Int32);// Methodusing System; class GFG { // Main Methodpublic 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// PrintIndexAndValuespublic 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();}}
Output:  
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          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
Example 3: For ArgumentOutOfRangeException 
CSHARP
// C# program to demonstrate// BitConverter.ToInt32(Byte[], Int32);// Methodusing System; class GFG { // Main Methodpublic 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// PrintIndexAndValuespublic 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();}}
Output: 
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          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
Example 4: For ArgumentNullException 
CSHARP
// C# program to demonstrate// BitConverter.ToInt32(Byte[], Int32);// Methodusing System; class GFG { // Main Methodpublic 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);    }}}
Output:  
Exception Thrown: System.ArgumentNullException
Reference:  
https://docs.microsoft.com/en-us/dotnet/api/system.bitconverter.toint32?view=netframework-4.7.2
 
simranarora5sos
CSharp-BitConverter-Class
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C#
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