Timing issue - DGV refreshes before process amends the data

Question

I\'ve got a button on a form that starts a process which, after x (varies) seconds, changes some data in a database table Y. The call InitializeGridView() then refreshes the DGV

Answer 1

You can call WaitForExit on the return value of Process.Start.

Answer 2

A follow-up question was closed so here's a copy of my answer:

If you need your InitialilzeGridView() Method to run after the process has finished:

1. Make available Dispatcher.CurrentDispatcher as _currentDispatcher.
2. Start the Process in a seperate Thread and have it WaitForExit() there.
3. Have the Thread call your InitializeGridview() Method via _currentDispatcher.BeginInvoke.

Here's some code to get you going:

Note: You will need to add a Reference to WindowsBase via the Add Reference dialog of your project.

using System;
using System.Diagnostics;
using System.Threading;
using System.Windows.Forms;
using System.Windows.Threading;

private readonly Dispatcher _currentDispatcher = Dispatcher.CurrentDispatcher;
private delegate void ReportingSchedulerFinishedDelegate();

private void btRunReport_Click(object sender, EventArgs e)
{
    btRunReport.Enabled = false;
    btRunReport.Text = "Processing..";
    var thread = new Thread(RunReportScheduler);
    thread.Start();
}

private void InitializeGridView()
{
    // Whatever you need to do here
}

private void RunReportScheduler()
{
    Process p = new Process();
    p.StartInfo.FileName = @"\\fileserve\department$\ReportScheduler_v3.exe";
    p.StartInfo.Arguments = "12";
    p.Start();
    p.WaitForExit();
    _currentDispatcher.BeginInvoke(new ReportingSchedulerFinishedDelegate(ReportingSchedulerFinished), DispatcherPriority.Normal);
}

private void ReportingSchedulerFinished()
{
    InitializeGridView();
    btRunReport.Enabled = true;
    btRunReport.Text = "Start";
}

Answer 3

You can call p.WaitForExit() on the process, but don't do that on the main thread (ie in a buttonClick);

You'll want something like:

//untested
private void btRunProcessAndRefresh_Click(object sender, EventArgs e)
{ 
    var p = Process.Start(@"\\fileserve\department$\ReportScheduler_v3.exe", "12"); 
    p.Exited += ProcessExited;
    p.EnableRaisingEvents = true;
    //InitializeGridView(); 
}     

void ProcessExited(object sender, EventArgs e)
{
    InitializeGridView();    
}