Question

i want to save a byte[] in a table of SQLite Database (Field datatype is BLOB).

In that array i want to save a negative Double value say -36524.063415093093 in byte format (Not in byte[] format)

Double b = -36524.063415093093;

//  Signature is 
//  byte[] arr = new Byte[] {Double, byte, byte, byte};

When i write Convert.ToByte(b) it gives error & if i write (byte)b it returns 84.

but how to i convert 84 back to -36524.063415093093?

Please correct if my approach is wrong?

Answer 1

Please correct if my approach is wrong?

Your approach is wrong 😉

You cannot store a double (which requires 64 bits) into a single byte (which is only 8 bits). It’s impossible

You can get a byte array, which is just all the 64 bits spread across 8 bytes. This would let you store your double in a byte array. But you indicate that you don’t want that.