Csharp Windows 窗体 C#，返回字符串数组始终为空

我有一个处理串口通信的应用程序，我有一个"coms handler"类，它基本上处理所有数据的接收/发送，并将解析后的数据传递给我的表单.然而，虽然我能够传递double、string、int和serialport，但我无法传递string[]数组，因为某些原因，它总是显示为空.

这是coms handler类中使用BleuIO的扫描方法:

internal string[] scanBleu(int scanTime)
{
    //returns array of found devices.
    string[] devices = new string[] { };

    bleuInBuffer.Clear();
    //Scan
    bleuPort.WriteLine("AT+CENTRAL\r\n");
    Thread.Sleep(100);
    bleuPort.WriteLine("AT+GAPSCAN=" + scanTime + "\r\n"); //Scan for x-seconds
    Thread.Sleep(1000 * scanTime);//Sleep while scanning, disabling button for scan time 
    for (int i = 0; i < bleuInBuffer.Count; i++)
    {
        if (bleuInBuffer[i].Contains("Device")) 
        {
            devices.Append(bleuInBuffer[i].ToString());
            Console.WriteLine("Appending device: " + bleuInBuffer[i]);
        }
    }
    devices.Append("Hello this is a test"); //NOT EVEN THIS IS APPENDED!, RETURNED DEVICES IS ALWAYS SIZE 0
    Thread.Sleep(50); //BREAK POINT SET UP HERE!
    return devices;
}

I tried adding a break-point in the Thread.Sleep line, and AT THAT TIME (note this is AFTER I ran the line Append("hello...") so it should have at least 1 component, however according to the data shown devices has a value of {string[0]} type string[].
Also note that the line "Console.WriteLine("Appending device...") did print on my console 40x times (so 40 devices were found)

现在，在我的表格上，我有以下代码来调用它:

private void scanBleu_Click(object sender, EventArgs e)
{
    bleuComboBox.Enabled = false;
    connect2BleuBtn.Enabled = false;
    if (dataHandler.isBleuConnected)
    {
        string[] devicesFound = dataHandler.scanBleu(bLEScanTime);
        Thread.Sleep((1000 * bLEScanTime) + 25);
        if (devicesFound.Length != 0)
        {
            bleuComboBox.Items.Clear();
            foreach (string device in devicesFound)
            {
                if (device.Contains("CMT")) //filters out for only the device we want
                {
                    bleuComboBox.Items.Add(device);
                }
            }
            updateBleuScanBtn();
        }
        bLEScanTime++;
        bleuComboBox.Enabled = true;
        connect2BleuBtn.Enabled = true;
        return;
    }
    populateBleuCBox(dataHandler.getPortList());
    connect2BleuBtn.Enabled = true;
    bleuComboBox.Enabled = true;
}

这是我的控制台输出的(部分)，只是为了让您可以看到附加了一些设备:

SCAN COMPLETE

Appending device: 
[01] Device: [1]6F:4C:F2:A8:FE:FA  RSSI: -74

Appending device: 
[02] Device: [1]3D:D1:56:D9:5A:60  RSSI: -75

Appending device: 
[03] Device: [1]23:C1:4A:71:07:FC  RSSI: -76

Appending device: 
[04] Device: [1]2F:EE:98:DA:7E:49  RSSI: -73

Appending device: 
[05] Device: [1]7A:3E:D9:6D:C0:C3  RSSI: -63