CODEWITHSUNDEEP
c#.netc#-4.0memorymemory-management
user3640235
user3640235

Reputation: 11

way to release memory in C#

I read data from serialport in byte[] then show in hex string in richtexbox.

private string ByteArray_to_Hex(byte[] data) {
    StringBuilder sb = new StringBuilder(data.Length * 3);

    foreach (byte b in data) {
        buffer_log.Add(b); // save data in buffer to write to file
        sb.Append(Convert.ToString(b, 16).PadLeft(2, '0').PadRight(3, ' '));
    }

    GC.Collect();
    return sb.ToString().ToUpper();
}

private void Log(string msg) {
    try {
        Richtexbox.Invoke(new EventHandler(delegate {
            Richtexbox.AppendText(msg);
            if (Richtexbox.Text.Length > 1000000) {

                // seem to slow when comparing to amount of data reading
                Richtexbox.Select(10000, 950000); 
                Richtexbox.SelectedText = "";
            }
        }));
    } catch {
    }
}

private void PLay_Click()
{
    Log(ByteArray_to_Hex(data_come_from_serialport);
}

It consume lots of memory since there are lots of texts. But when I call

private void menu_Clear_Click(object sender, EventArgs e) {
    Richtexbox.Clear();
    buffer_log.Clear();
    GC.Collect();
}

It isn't release memory, still consume lots of memory in ram. What 's the best way to release these memory?

Update:

since it's the best way. What is this problem. I describe my problem I had: This app always has systemoutofmemory exception when runing for 1 hour. If I run this app for 55 minutes then call Clear method, it only work for 5 minutes and has systemoutofmemory exception. Can someone explain this ?

private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            if (!SerialPort.IsOpen)
            {
                return;
            }
            if (flag_stop)
            {
                return; 
            }
            int bytes = SerialPort.BytesToRead;
            byte[] buffer = new byte[bytes];
            SerialPort.Read(buffer, 0, bytes);
            Log(ByteArray_to_Hex(buffer));
        }

update way to read data from serialport.

Upvotes: 0

Views: 2294

Answers (1)

Archlight
Archlight

Reputation: 2079

You should not need to do anything. Thats the magic of managed code.

But you want to try to trigger the garbage collector you can use.

    GC.Collect();
    GC.WaitForPendingFinalizers();

But read this first and then this and finally the dry boring msdn text

Upvotes: 2

Related Questions