Byte array to int C#

Question

I am triyng to convert byte array into an int value however I am getting an exception:

"Destination array is not long enough to copy all the items in the collection. Check array index and length."

the exception is on line:

int length = BitConverter.ToInt32(bytes_length, 0);

byte _length contain the value (0x00,0x09);

here is my code:

byte[] bytes_length = new byte[Value_of_length];                   
//copy the byte byte array to the correct length.
Array.Copy(data, Place_of_length, bytes_length, 0,bytes_length.Length
int length = BitConverter.ToInt32(bytes_length, 0);

Answer 1

Int32 needs 32 bits, or four bytes. Your array contains only two bytes, which means that you cannot convert it to Int32 .

You can either convert it to Int16

int length = BitConverter.ToInt16(bytes_length, 0);

or to extend two more bytes to the array before Int32 conversion.

Moreover, you can skip copying altogether:

int length = BitConverter.ToInt16(data, Place_of_length);