Re: Updating UI/Dataset from serialport - C# Discussion Boards

Darkness8413-Feb-07 12:39

13-Feb-07 12:39

I need some help with being able to open a document that is listed in a datatable and is displayed in a datagridview. The code below returns a series of results from a database and these results include the file paths of files on my computer. What I want to be able to do is doulble click on a particular file path in the link column and have that file open.

Hits hits = searcher.Search(query);
DataTable dt = new DataTable();
dt.Columns.Add("link", typeof(string));
for (int j = 0; j < hits.Length(); j++)
{
       // get the document from index
       Document doc = hits.Doc(j);
       // get the document filename
       DataRow row = dt.NewRow();
       row["link"] = doc.Get("link");
       dt.Rows.Add(row);
}
MessageBox.Show("Search Complete", "", MessageBoxButtons.OK);
return dt;

Re: Opening a document from a DataTable

Darkness8413-Feb-07 13:53

Darkness84

13-Feb-07 13:53

I have solved the problem, just in case anyone is interested.

private void dgv_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{
     SearchIndex search = new SearchIndex();
     search.docOpen(this.dgv.CurrentCell.Value.ToString());
}

public void docOpen(string path)
{
     Process proc = new Process();
     proc.StartInfo.FileName = "iexplore";
     proc.StartInfo.Arguments = path;
     proc.Start();
}

Updating UI/Dataset from serialport

TheTinSoldier13-Feb-07 12:22

TheTinSoldier

13-Feb-07 12:22

This problem has to do with updating a control/dataset based on the DataRecevied event of the serial port. Now I know you are thinking cross threading (which it might be) but let me explain.

I have a dataset in the main UI form that is databound to a number of controls. When I change the values of the dataset the bound controls update. This is fine, but when I update the values of the dataset via the DataReceived event the values DON'T update? To illlustrate the problem simply I have stripped down the code to it's most basic form. I hope someone can shed some light on the problem.

<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            // create a dataset and populate it with data<br />
            UnitDataSet uds = new UnitDataSet();<br />
            uds.DIns.ReadXml("Data.xml");<br />
<br />
            // create a new comms instance and pass a ref to the dataset<br />
            _comms = new Comms(uds);<br />
<br />
            // create a label to bind too<br />
            Label lblInputState = new Label();<br />
            panel1.Controls.Add(lblInputState);<br />
<br />
            // databind the control to the state column<br />
            lblInputState.DataBindings.Add("Text", uds.Tables["DIns"], "state");<br />
        }<br />
<br />
        // used to test if the binding works and value changes as expected<br />
        public void button1_Click(object sender, EventArgs e)<br />
        {<br />
            _comms.ChangeValue();<br />
        }<br />
    }<br />
<br />
============================================================<br />
<br />
class Comms<br />
    {<br />
        SerialPort _sp;<br />
        UnitDataSet _uds;<br />
<br />
        public Comms(UnitDataSet uds)<br />
        {<br />
            _uds = uds;<br />
            _sp = new SerialPort("COM7", 9600, Parity.None, 8, StopBits.One);<br />
            _sp.DataReceived += new SerialDataReceivedEventHandler(_sp_DataReceived);<br />
            _sp.Open();<br />
        }<br />
<br />
        private void _sp_DataReceived(object sender, SerialDataReceivedEventArgs e)<br />
        {<br />
            // run this method when the event fires<br />
            ChangeValue();<br />
        }<br />
<br />
        // if i call this from the main form button (see above ) the value changes but if it's called<br />
        // by the above DataReceived event the value doesn't change!?!<br />
        public void ChangeValue()<br />
        {<br />
            // simple toggle to change the value<br />
            bool tmp = (bool)_uds.Tables["DIns"].Rows[0]["state"];<br />
            _uds.Tables["DIns"].Rows[0]["state"] = !tmp;<br />
        }<br />
    }<br />

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