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:
// 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();
}
}
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
// 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("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
// 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("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
// 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);
}
}
}
Output:
Exception Thrown: System.ArgumentNullException
Reference: