我应该从多个设备读取标签，但使用单个端口。我可以这样做，但是当我读取一个在其前面保留标签的设备时，除非我删除标签，否则另一台设备不会读入字符串。我需要同时从所有设备读取标签。它适用于超级终端，因此问题出在代码中
我的代码：
private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
//int bytes = serialPort1.BytesToRead;
////create a byte array to hold the awaiting data
//byte[] comBuffer = new byte[bytes];
////read the data and store it
//serialPort1.Read(comBuffer, 0, bytes);
//MessageBox.Show(comBuffer[bytes]);
////display the data to the user
////DisplayData(MessageType.Incoming, ByteToHex(comBuffer) + "\n");
//serialPort1.Dispose();
//serialPort1.Close();
//if (serialPort1.IsOpen)
//{
// serialPort1.ReadExisting();
// serialPort1.Close();
//}
string data = serialPort1.ReadLine();
data = data.Substring(2, 2);
if (data == "03")
{
//while (data == "03")
//{
string data1 = serialPort1.ReadLine();
data1 = data1.Substring(4, 10);
for (int b = 0; b < dataGridView3.Rows.Count; b++)
{
string floorno = dataGridView3.Rows[b].Cells[0].Value.ToString();
SqlConnection conn = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd = new SqlCommand("Select Floor,RfidTag,DeviceId from LiftMonitor where Floor='" +
floorno + "'and DeviceId='03'", conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
SqlCommandBuilder commandBuilder1 = new SqlCommandBuilder(da);
da.Fill(ds, "LiftMonitor");
for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
{
DataRow dr = ds.Tables[0].Rows[j];
string rfidtag = dr["RfidTag"].ToString();
if (rfidtag == data1)
{
dataGridView3.ClearSelection();
dataGridView3.Rows[b].Selected = true;
goto abc;
timer1.Start();
SqlConnection conn1 = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd1 = new SqlCommand(" Select Timer from Setting ", conn1);
SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
DataSet ds1 = new DataSet();
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(da1);
da1.Fill(ds1, "Timer");
for (int k = 0; k < ds1.Tables[0].Rows.Count; k++)
{
DataRow dr1 = ds1.Tables[0].Rows[k];
string timer = dr1["Timer"].ToString();
int timer2 = Convert.ToInt32(timer);
timeConversion = timer2 * 1000;
if (timeConversion.Equals(timer1.Interval))
{
timer1.Tick += new System.EventHandler(timer1_Tick);
}
}
}
else
{
}
}
}
//}
}
if (data == "04")
{
//while (data == "04")
//{
string data1 = serialPort1.ReadLine();
//data1 = data1.Substring(1, 2);
data1 = data1.Substring(4, 10);
for (int b = 0; b < dataGridView4.Rows.Count; b++)
{
string floorno = dataGridView4.Rows[b].Cells[0].Value.ToString();
SqlConnection conn = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd = new SqlCommand("Select Floor,RfidTag,DeviceId from LiftMonitor where Floor='" +
floorno + "' and DeviceId='04'", conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
SqlCommandBuilder commandBuilder1 = new SqlCommandBuilder(da);
da.Fill(ds, "LiftMonitor");
for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
{
DataRow dr = ds.Tables[0].Rows[j];
string rfidtag = dr["RfidTag"].ToString();
if (rfidtag == data1)
{
dataGridView4.ClearSelection();
dataGridView4.Rows[b].Selected = true;
goto abc;
timer1.Start();
SqlConnection conn1 = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd1 = new SqlCommand(" Select Timer from Setting ", conn1);
SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
DataSet ds1 = new DataSet();
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(da1);
da1.Fill(ds1, "Timer");
for (int k = 0; k < ds1.Tables[0].Rows.Count; k++)
{
DataRow dr1 = ds1.Tables[0].Rows[k];
string timer = dr1["Timer"].ToString();
int timer2 = Convert.ToInt32(timer);
timeConversion = timer2 * 1000;
if (timeConversion.Equals(timer1.Interval))
{
timer1.Tick += new System.EventHandler(timer1_Tick);
}
}
}
else
{
}
}
}
//}
}
if (data == "05")
{
//while (data == "05")
//{
string data1 = serialPort1.ReadLine();
data1 = data1.Substring(4, 10);
for (int b = 0; b < dataGridView5.Rows.Count; b++)
{
string floorno = dataGridView5.Rows[b].Cells[0].Value.ToString();
SqlConnection conn = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd = new SqlCommand("Select Floor,RfidTag,DeviceId from LiftMonitor where Floor='" +
floorno + "'and DeviceId='05'", conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
ds = new DataSet();
SqlCommandBuilder commandBuilder1 = new SqlCommandBuilder(da);
da.Fill(ds, "LiftMonitor");
for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
{
DataRow dr = ds.Tables[0].Rows[j];
string rfidtag = dr["RfidTag"].ToString();
if (rfidtag == data1)
{
dataGridView5.ClearSelection();
dataGridView5.Rows[b].Selected = true;
//break;
goto abc;
timer1.Start();
SqlConnection conn1 = new SqlConnection(dba.GetConnectionString());
SqlCommand cmd1 = new SqlCommand(" Select Timer from Setting ", conn1);
SqlDataAdapter da1 = new SqlDataAdapter(cmd1);
DataSet ds1 = new DataSet();
SqlCommandBuilder commandBuilder = new SqlCommandBuilder(da1);
da1.Fill(ds1, "Timer");
for (int k = 0; k < ds1.Tables[0].Rows.Count; k++)
{
DataRow dr1 = ds1.Tables[0].Rows[k];
string timer = dr1["Timer"].ToString();
int timer2 = Convert.ToInt32(timer);
timeConversion = timer2 * 1000;
if (timeConversion.Equals(timer1.Interval))
{
timer1.Tick += new System.EventHandler(timer1_Tick);
}
}
}
//else
//{
// break;
//}
}
}
}
}