uj5u.com熱心網友回復：
表單在關閉時被處理。
我建議使用工廠
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>());
}
}
每次單擊按鈕時初始化一個新表單。
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();
}
}
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