DotNet.AuthorizeClient/FormActivate.cs

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using System;
using System.Windows.Forms;
using System.Threading;

namespace DotNet.AuthorizeClient
{
    internal partial class FormActivate : Form
    {
        #region 窗体单列模式
        /// <summary>
        /// 定义一个私有的静态全局变量来保存该类的唯一实例
        /// </summary>
        private static FormActivate singleForm;

        /// <summary>
        /// 定义一个只读静态对象,且这个对象是在程序运行时创建的
        /// </summary>
        private static readonly object syncObject = new object();

        /// <summary>
        /// 定义一个全局访问点,设置为静态方法,则在类的外部便无需实例化就可以调用该方法
        /// </summary>
        /// <returns></returns>
        internal static FormActivate GetInstance()
        {
            //这里可以保证只实例化一次
            //即在第一次调用时实例化
            //以后调用便不会再实例化
            //第一重 singleton == null
            if (singleForm == null || singleForm.IsDisposed)
            {
                //第二重 singleton == null
                if (singleForm == null || singleForm.IsDisposed)
                {
                    singleForm = new FormActivate();
                }
            }
            return singleForm;
        }

        /// <summary>
        /// 构造函数必须是私有的,这样在外部便无法使用new 来创建该类的实例
        /// </summary>
        private FormActivate()
        {
            InitializeComponent();
            this.textBoxRegistCode1 = new DotNet.Authorize.TextBoxRegistCode(DotNet.Authorize.RegistHelper.GetLocalRegCode());
            this.textBoxRegistCode1.Location = new System.Drawing.Point(81, 18);
            this.textBoxRegistCode1.Name = "textBoxRegistCode1";
            this.textBoxRegistCode1.TabIndex = 6;
            this.Controls.Add(this.textBoxRegistCode1);

        }

        #endregion

        /// <summary>
        /// 注册码控件
        /// </summary>
        private DotNet.Authorize.TextBoxRegistCode textBoxRegistCode1;