WinForm Singleton Form Usage Example

This article illustrates the WinForm singleton form. Share it for your reference, as follows:

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Text;
namespace Common
{
  /// <summary>
  ///  Singleton mode of form 
  /// </summary>
  /// <typeparam name="T"></typeparam>
  public class FormSingle<T> where T : Form, new()
  {
    private static T form;
    private static IList<T> list { get; set; }
    public static T GetForm(T t1)
    {
      // Check whether a form exists 
      if (!IsExist(t1))
      {
        CreateNewForm(t1);
      }
      return form;
    }
    /// <summary> Release object 
    /// </summary>
    /// <param name="obj"></param>
    /// <param name="args"></param>
    private static void Display(object obj, FormClosedEventArgs args)
    {
      form = null;
      list.Remove(form);
    }
    /// <summary> Create a new form 
    /// </summary>
    private static void CreateNewForm(T t1)
    {
      form = t1;
      form.FormClosed += new FormClosedEventHandler(Display);// Subscribe to the closing event of the form and release the object 
    }
    /// <summary>
    ///  Whether the form exists 
    /// </summary>
    /// <param name="T1"></param>
    /// <returns></returns>
    private static bool IsExist(T T1)
    {
      if (list == null)
      {
        list=new List<T>();
        list.Add(T1);
        return false;
      }
      // If the text of the form is the same, it is considered the same 1 Form 
      foreach (var t in list)
      {
        if (t.Text == T1.Text)
          return true;
      }
      list.Add(T1);
      return false;
    }
  }
}

The call is as follows:

Constructor without parameters

Customer.AddCustomer customer = Common.FormSingle<Customer.AddCustomer>.GetForm(new Customer.AddCustomer());
customer.MdiParent = this;//Mdi Form 
customer.WindowState = FormWindowState.Maximized;// Maximize 
customer.Show();
customer.Activate();

Constructor with parameters

Customer.AddCustomer customer = Common.FormSingle<Customer.AddCustomer>.GetForm(new Customer.AddCustomer(customerid));
customer.MdiParent = this;
customer.WindowState = FormWindowState.Maximized;
customer.Show();
customer.Activate();

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