Getting issue with the dependency injection asp core 6 with winforms creation? - winforms

Question

Github link to sample project
static void Main()
{
ApplicationConfiguration.Initialize();
var builder = new HostBuilder()
.ConfigureServices((hostContext, services) =>
{
services.AddTransient<Form1>();
services.AddTransient<Form2>();
});
var host = builder.Build();
using (var serviceScope = host.Services.CreateScope())
{
IServiceProvider services = serviceScope.ServiceProvider;
Application.Run(services.GetRequiredService<Form1>());
}
}
Form1 is MDI MdiParent where i am injecting Form 2
public partial class Form1 : Form
{
private readonly Form2 form2;
public Form1(Form2 form2)
{
InitializeComponent();
this.form2 = form2;
}
private void form2ToolStripMenuItem_Click(object sender, EventArgs e)
{
this.form2.MdiParent = this;
this.form2.Show();
}
}
When I Open Form2 by clicking from Menu it opens and close it by using [X] button
When i reopen it i am getting error

Answer 1

The form is disposed when closed.
I would suggest using a factory
static void Main() {
ApplicationConfiguration.Initialize();
var builder = new HostBuilder()
.ConfigureServices((hostContext, services) => {
services.AddTransient<Form1>();
services.AddTransient<Form2>();
//Form2 factory delegate
services.AddSingleton<Func<Form2>>(sp => () => sp.GetRequiredService<Form2>());
});
var host = builder.Build();
using (var serviceScope = host.Services.CreateScope()) {
IServiceProvider services = serviceScope.ServiceProvider;
Application.Run(services.GetRequiredService<Form1>());
}
}
to initialize a new form every time the button is clicked.
public partial class Form1 : Form {
private readonly Func<Form2> factory;
public Form1(Func<Form2> factory) {
InitializeComponent();
this.factory = factory;
}
private void form2ToolStripMenuItem_Click(object sender, EventArgs e) {
Form2 form2 = factory();
form2.MdiParent = this;
form2.Show();
}
}