我在C＃windows表单应用程序中处理项目。
在这个项目中，主窗体包含用于串口通信的子窗体。 SubForm＆＃34; Connect＆＃34;有两个按钮连接和关闭。另外还有5个组合框，用于选择波特率，Com名称，奇偶校验，stopbits和数据位。
从组合框中选择所有设置后单击“连接”按钮。端口连接，连接按钮变为断开连接。我将关闭Connect表单
现在我的问题是，当我重新打开表单时，在关闭表单时没有单击“断开连接”按钮，Comport将断开连接。我不希望ComPort关闭。
请帮我解决这个错误。我不知道我错在哪里。提前谢谢。
连接班级代码
public partial class Connect : Form
{
public bool Connect_Status = false;
public Connect()
{
InitializeComponent();
COM_List();
}
private void COM_List()
{
for (int i = 0; i < CommPortManager.Instance.GetCommList().Count; i++)
{
cb_CommPort.Items.Add(CommPortManager.Instance.GetCommList()[i]);
}
}
private void btn_Connect_Click(object sender, EventArgs e)
{
if (btn_Connect.Text == "Connect")
{
CommPortManager.Instance.PortName = cb_CommPort.Text;
CommPortManager.Instance.BaudRate = cb_BaudRate.Text;
CommPortManager.Instance.Parity = cb_Parity.Text;
CommPortManager.Instance.StopBits = cb_StopBits.Text;
CommPortManager.Instance.DataBits = cb_DataBits.Text;
if ((cb_CommPort.Text == "") || (cb_BaudRate.Text == "") || (cb_Parity.Text == "") || (cb_DataBits.Text == "") || (cb_StopBits.Text == ""))
{
if (cb_CommPort.Text == "")
{
MessageBox.Show("Please select COM Port and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_BaudRate.Text == "")
{
MessageBox.Show("Please select BaudRate and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_Parity.Text == "")
{
MessageBox.Show("Please select Parity and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_DataBits.Text == "")
{
MessageBox.Show("Please select DataBits and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if(cb_StopBits.Text == "")
{
MessageBox.Show("Please select StopBits and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
Connect_Status = false;
}
else
{
if (CommPortManager.Instance.COM_Open() == false)
{
MessageBox.Show("Could not open the COM port. Most likely it is already in use, has been removed, or is unavailable.", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
Connect_Status = false;
}
else
{
//CommPortManager.Instance.COM_Close();
Connect_Status = true;
btn_Connect.Text = "Disconnect";
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
btn_Connect.BackColor = System.Drawing.Color.Salmon;
}
}
}
else
{
CommPortManager.Instance.COM_Close();
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}
private void btn_Close_Click(object sender, EventArgs e)
{
this.Close();
}
private void Connect_Load(object sender, EventArgs e)
{
//code here to setup the value;
cb_CommPort.Text = CommPortManager.Instance.PortName;
cb_BaudRate.Text = CommPortManager.Instance.BaudRate;
cb_Parity.Text = CommPortManager.Instance.Parity;
cb_StopBits.Text = CommPortManager.Instance.StopBits;
cb_DataBits.Text = CommPortManager.Instance.DataBits;
if (CommPortManager.Instance.IsOpen == true)
{
btn_Connect.Text = "Disconnect";
btn_Connect.BackColor = System.Drawing.Color.Salmon;
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
}
else
{
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}
}
答案 0 :(得分：1)
我怀疑表单加载事件。您需要在打开时将连接状态设置为true
private void Connect_Load(object sender, EventArgs e)
{
//code here to setup the value;
cb_CommPort.Text = CommPortManager.Instance.PortName;
cb_BaudRate.Text = CommPortManager.Instance.BaudRate;
cb_Parity.Text = CommPortManager.Instance.Parity;
cb_StopBits.Text = CommPortManager.Instance.StopBits;
cb_DataBits.Text = CommPortManager.Instance.DataBits;
if (CommPortManager.Instance.IsOpen == true)
{
Connect_Status = true;
btn_Connect.Text = "Disconnect";
btn_Connect.BackColor = System.Drawing.Color.Salmon;
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
}
else
{
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}
答案 1 :(得分：0)
看起来，如果按“连接”，则会将btn_Connect.Text更改为
断开（如果端口已打开）
现在，按钮文字为“Disconnect”，if (btn_Connect.Text == "Connect")现在为 false ，else被调用CommPortManager.Instance.COM_Close();