Value was either too large or too small for an unsigned byte

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How to do that. Someone help me.

What I have tried:

private void timer1_Tick(object sender, EventArgs e)
     {
          item3.Azimuth++;
         label2.Text = item3.Azimuth.ToString();


         byte[] bytesToSend = new byte[7] { 0x7E, 0xD6, Convert.ToByte(item3.Azimuth  >> 8), Convert.ToByte(item3.Azimuth), 0x20, 0x00, 0x40 };
         port.Write(bytesToSend, 0, bytesToSend.Length);
     }

Posted 18-Oct-20 23:04pm

Member 13785296

Updated 18-Oct-20 23:21pm

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OriginalGriff · Answer 1 · 2020-10-18T23:21:00

What it's saying is that the value in Azimuth is too big for a byte: it exceeds teh maximum value of 0xFF or 255 that a byte value can contain.
For example:

C#

int Azimuth = 0x1234;
byte b = Convert.ToByte(Azimuth);

Will throw the same error.
To fix that, mask it:

C#

int Azimuth = 0x1234;
byte b = Convert.ToByte(Azimuth & 0xFF);

Or better:

C#

int Azimuth = 0x1234;
byte b = (byte) (Azimuth & 0xFF);

In your code that would be:

C#

byte[] bytesToSend = new byte[7] {0x7E, 
                                  0xD6, 
                                  (byte) (item3.Azimuth >> 8), 
                                  (byte) (item3.Azimuth & 0xFF), 
                                  0x20, 
                                  0x00, 
                                  0x40};