[C#]组件的例子代码<-备忘

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Collections;
using System.Diagnostics;
using System.Windows.Forms;

namespace WindowsControlLibrary1
{
    [DefaultProperty("Active")]
    public class Component1 : System.ComponentModel.Component, ISupportInitialize
    {
        /**//// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        private DateTime _alarm = DateTime.Now;
        private bool _showDigitalTime = true;

        [Category("Behavior")]
        [Description("This is alarm time")]
        public DateTime Alarm
        {
            get { return _alarm; }
            set { _alarm = value; }
        }

        [DefaultValue(true)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [Browsable(false)]
        public bool ShowDigitalTime
        {
            get { return _showDigitalTime; }
            set { _showDigitalTime = value; }
        }

        public Component1(System.ComponentModel.IContainer container)
        {
            /**////
            /// Windows.Forms 类撰写设计器支持所必需的
            ///
            container.Add(this);
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        public Component1()
        {
            /**////
            /// Windows.Forms 类撰写设计器支持所必需的
            ///
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /**//// <summary> 
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if(components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }


        组件设计器生成的代码#region 组件设计器生成的代码
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            components = new System.ComponentModel.Container();
        }
        #endregion

        [Browsable(false)]
        public Form Owner
        {
            // 用于在设计期向InitializeComponent添加代码, 产生的代码类似:
            // this.component1.Owner = this;
            get 
            { 
                if ((_owner  == null) && (this.DesignMode))
                {
                    // 访问设计器宿主并获取根组件的引用
                    IDesignerHost designer = 
                        this.GetService(typeof(IDesignerHost)) as IDesignerHost;
                    if (designer != null)
                    {
                        _owner = designer.RootComponent as Form;
                    }
                }

                return _owner;
            }
            // 在运行期由InitializeComponent设置
            set 
            {
                if (! this.DesignMode)
                {
                    // 不要在运行期间修改Owner
                    if ((_owner != null) && (_owner != value))
                    {
                        throw new InvalidOperationException("Cann't set Owner at run time.");
                    }
                }
                _owner = value; 
            }
        }
        private Form _owner = null;

        [DefaultValue(false)]
        public bool Active
        {
            get { return _active; }
            set 
            {
                if (! _initializing)
                {
                    if (Owner == null) throw new Exception("Owner cann't be null.");
                }

                _active = value; 
            }
        }
        private bool _active = false;

        ISupportInitialize 成员#region ISupportInitialize 成员

        private bool _initializing = false;

        public void BeginInit()
        {
            _initializing = true;
        }

        public void EndInit()
        {
            if (Owner == null) throw new Exception("Owner cann't be null.");

            _initializing = false;
        }

        #endregion
    }
}