本文实例讲述了WinForm单例窗体。分享给大家供大家参考，具体如下：
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using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Text;
namespace Common
{
/// <summary>
/// 窗体的单例模式
/// </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)
{
//检查是否存在窗体
if (!IsExist(t1))
{
CreateNewForm(t1);
}
return form;
}
/// <summary>释放对象
/// </summary>
/// <param name="obj"></param>
/// <param name="args"></param>
private static void Display(object obj, FormClosedEventArgs args)
{
form = null;
list.Remove(form);
}
/// <summary>创建新窗体
/// </summary>
private static void CreateNewForm(T t1)
{
form = t1;
form.FormClosed += new FormClosedEventHandler(Display);//订阅窗体的关闭事件，释放对象
}
/// <summary>
/// 是否存在该窗体
/// </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;
}
//如果窗体的文本相同则认为是同一个窗体
foreach (var t in list)
{
if (t.Text == T1.Text)
return true;
}
list.Add(T1);
return false;
}
}
}
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调用如下：
不带参数的构造函数
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Customer.AddCustomer customer = Common.FormSingle<Customer.AddCustomer>.GetForm(new Customer.AddCustomer());
customer.MdiParent = this;//Mdi窗体
customer.WindowState = FormWindowState.Maximized;//最大化
customer.Show();
customer.Activate();
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带参数的构造函数
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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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希望本文所述对大家C#程序设计有所帮助。