【WinForm窗体控件开发】之三续 窗体控件设计时的事件属性

这次我们主要将上回自定义控件的Attribute部分如何定义Event事件属性简单说明下：

在自定义的控件中添加自定义的事件属性步骤：

1.需要声明自定义事件参数，一般是继承自EventArgs类；

2.声明事件委托；

3.定义事件名称；

下面我们来看看一个自定义事件的示例：

我们首先定义一个窗体控件【SecondControl自定义控件的Event属性.cs】，代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WinFormControlLibrary
{
    public partial class SecondControl自定义控件的Event属性 : TextBox
    {
        /// <summary>
        /// Constructor
        /// </summary>
        public SecondControl自定义控件的Event属性()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 声明CustomerLogin自定义事件参数
        /// </summary>
        public sealed class CustomerLoginEventArgs : EventArgs { }

        /// <summary>
        /// 声明CustomerLogout自定义事件参数
        /// </summary>
        public sealed class CustomerLogoutEventArgs : EventArgs { }

        /// <summary>
        /// 声明CustomerLogin事件委托
        /// </summary>
        public delegate void CustomerLoginEventHandler(object sender, CustomerLoginEventArgs e);

        /// <summary>
        /// 声明CustomerLogout事件委托
        /// </summary>
        public delegate void CustomerLogoutEventHandler(object sender, CustomerLogoutEventArgs e);

        /// <summary>
        /// 声明事件名称
        /// </summary>
        [CategoryAttribute("自定义事件")]
        public event CustomerLoginEventHandler CustomerLogin
        {
            add { }
            remove { }
        }

        /// <summary>
        /// 声明事件名称
        /// </summary>
        [CategoryAttribute("自定义事件")]
        public event CustomerLogoutEventHandler CustomerLogout
        {
            add { }
            remove { }
        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);
        }
    }
}

接下来，新建Form并添加这个自定义控件，代码如下：

namespace 自定义窗体控件Demo
{
    partial class 之三窗体控件设计时Event属性Attribute
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.secondControl自定义控件的Event属性1 = new WinFormControlLibrary.SecondControl自定义控件的Event属性();
            this.SuspendLayout();
            // 
            // secondControl自定义控件的Event属性1
            // 
            this.secondControl自定义控件的Event属性1.Location = new System.Drawing.Point(55, 48);
            this.secondControl自定义控件的Event属性1.Name = "secondControl自定义控件的Event属性1";
            this.secondControl自定义控件的Event属性1.Size = new System.Drawing.Size(100, 20);
            this.secondControl自定义控件的Event属性1.TabIndex = 0;
            // 
            // 之三窗体控件设计时Event属性Attribute
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.secondControl自定义控件的Event属性1);
            this.Name = "之三窗体控件设计时Event属性Attribute";
            this.Text = "之三窗体控件设计时Event属性Attribute";
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        private WinFormControlLibrary.SecondControl自定义控件的Event属性 secondControl自定义控件的Event属性1;
    }
}

添加完成后，我们就可以在设计时的属性栏中看见我们自定义的属性了。

关于设计时的Attribute就基本介绍到这里。