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Create a new instance of a form and keep it open


Create a new instance of a form and keep it open

By : Giorgio Marinelli
Date : November 22 2020, 09:00 AM
I think the issue was by ths following , The reason the form is closing is because your application is closing which in turn closes all the open forms.
Try specifying a form using Application.Run. Something like this:
code :
Module modMain
    Sub Main()
        Dim guiForm As Form = Shell.MainGuiForm
        Application.Run(guiForm)
    End Sub
End Module
Public Class Shell
    Private Shared _container As New ContainerForm
    Public Shared ReadOnly Property MainGuiForm As Form
        Get 
            Return _container
        End Get
End Class


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How can I create a new instance of a form class and then open it as a acDialog box (pausing other code)?

How can I create a new instance of a form class and then open it as a acDialog box (pausing other code)?


By : ajithgopy
Date : March 29 2020, 07:55 AM
will be helpful for those in need Problem , You can use this code to check if a form is visible:
code :
Private Function IsVisible(intObjType As Integer, strObjName As String) As Boolean
    Dim intObjState As Integer
    intObjState = SysCmd(acSysCmdGetObjectState, intObjType, strObjName)
    IsVisible = intObjState And acObjStateOpen
End Function
Do While IsVisible(acForm, "frmInfo")
    DoEvents
Loop
How to create single instance WPF Application that restores the open window when an attempt is made to open another inst

How to create single instance WPF Application that restores the open window when an attempt is made to open another inst


By : R.DOG
Date : March 29 2020, 07:55 AM
it fixes the issue You're looking for the Mutex Class. It's pretty complicated, but luckily the Singleton Pattern has been widely discussed. There are several good articles on it, but you can find a good implementation of it in the C# .NET Single Instance Application page on the Sanity Free Coding website. From the linked page:
code :
static class Program {
    static Mutex mutex = new Mutex(true, "{8F6F0AC4-B9A1-45fd-A8CF-72F04E6BDE8F}");
    [STAThread]
    static void Main() {
        if(mutex.WaitOne(TimeSpan.Zero, true)) {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
            mutex.ReleaseMutex();
        } else {
            MessageBox.Show("only one instance at a time");
        }
    }
}
public partial class App : Application
{
    private static Mutex mutex = new Mutex(true, "{8F6F0AC4-B9A1-45fd-A8CF-72F04E6BDE8F}");
    private static MainWindow mainWindow = null;

    App()
    {
        InitializeComponent();
    }

    [STAThread]
    static void Main()
    {
        if(mutex.WaitOne(TimeSpan.Zero, true)) 
        {
            App app = new App();
            mainWindow = new MainWindow();
            app.Run(mainWindow);
            mutex.ReleaseMutex();
        }
        else
        {
            mainWindow.WindowState = WindowState.Normal;
        }
    }
}
Create a field in form for each model instance related to another instance in django

Create a field in form for each model instance related to another instance in django


By : user2990025
Date : March 29 2020, 07:55 AM
Open a Form if there is not another instance of it Open - Pass Type to a Method

Open a Form if there is not another instance of it Open - Pass Type to a Method


By : Jason.tang
Date : March 29 2020, 07:55 AM
I wish this helpful for you I want to simplify some of my code. Therefore i want to make a function wich checks, if a certain form is already open. Right now i have the code below behind every button on my start-form. , You can use either of these options.
Using a generic method:
code :
private void StartNewForm<T>()
    where T : Form, new()
{
    FormCollection fc = Application.OpenForms;
    foreach (Form frm in fc)
    {
        if (frm is T) { return; }
    }
    var newForm = new T();
    newForm.Show();
}
private void StartNewForm(Type myForm)
{
    FormCollection fc = Application.OpenForms;
    foreach (Form frm in fc)
    {
        if (frm.GetType() == myForm) { return; }
    }
    var newForm = (Form)Activator.CreateInstance(myForm);
    newForm.Show();
}
private void StartNewForm<T>() where T : Form, new()
{
    var f = (Application.OpenForms.OfType<T>().FirstOrDefault() ?? new T());
    f.Show();
}
How to keep the form instance for further re-open?

How to keep the form instance for further re-open?


By : GreenCentury
Date : March 29 2020, 07:55 AM
With these it helps I am using C# 2010. From my MdiParent toolstrip I am using the following codes to open the mdichild. , Use Form.Hide instead of Form.Close.
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