Convert a Short[2] to Int32 in C#

Question

I have a short array in c# and I need to convert two elements in an Int32. The code I wrote is the following

uint pesoparz = (Convert.ToUInt16(values[0]));
Int32 pesotot = Convert.ToInt32(pesoparz *65536 + Convert.ToUInt16(values[1]));

where values[] is the short array and pesotot is the Int32 that I would like to obtain. It works but unfortunately when the value[1] exceeds 2^15, I get the system overflow exception.

Why does the exception occur?

Answer 1

You can use bitwise operators:

short[] parts = new short[2];
parts[0] = 1;
parts[1] = 2;

uint result = 0;

result = (ushort)parts[0] << 16 | (ushort)parts[1];

The result will be 0x00010002 in hex or 65538 in decimal.