C#自定义控件开发（1）

自定义控件可以用组件或者用户控件来开发，如果是基于基础控件，进行一些扩展，那么可以使用组件，其它的情况可以使用用户控件。

首先新建一个类库项目，然后添加一个组件，取名为ButtonExtend,再添加一个窗体进行测试：

因为是要在Button的基础上进行开发，所以将继承Component改为继承Button,同时将图片添加到资源中，方便使用。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace JSControl
{
    public partial class ButtonExtend : Button
    {
        public ButtonExtend()
        {
            InitializeComponent();
            this.Size = new System.Drawing.Size(50,100);//初始化控件大小
        }

        public ButtonExtend(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }

        #region Filed
        private ButtonPresetImage buttonType;

        [Browsable(true)]
        [Category("ButtonType")]
        [Description("设置图片")]
        public ButtonPresetImage ButtonType
        {
            get { return buttonType; }
            set
            {
                switch (buttonType)
                {
                    buttonType = value;
                    case ButtonPresetImage.None:
                        this.Image = null;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
                        break;
                    case ButtonPresetImage.Check:
                        this.Image = Properties.Resources.check;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Close:
                        this.Image = Properties.Resources.close;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Cancel:
                        this.Image = Properties.Resources.cancel;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Back:
                        this.Image = Properties.Resources.back;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Down:
                        this.Image = Properties.Resources.down;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Go:
                        this.Image = Properties.Resources.go;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Up:
                        this.Image = Properties.Resources.up;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Folder:
                        this.Image = Properties.Resources.folder;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Refresh:
                        this.Image = Properties.Resources.refresh;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Setting:
                        this.Image = Properties.Resources.setting;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.FolderOpen:
                        this.Image = Properties.Resources.folder_open;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.DocumentDelete:
                        this.Image = Properties.Resources.document_delete;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Document:
                        this.Image = Properties.Resources.document;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.DocumentEdit:
                        this.Image = Properties.Resources.document_edit;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Info:
                        this.Image = Properties.Resources.info;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.DocumentAdd:
                        this.Image = Properties.Resources.document_add;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Global:
                        this.Image = Properties.Resources.web;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Calculator:
                        this.Image = Properties.Resources.calculator;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Calendar:
                        this.Image = Properties.Resources.calendar;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    case ButtonPresetImage.Printer:
                        this.Image = Properties.Resources.printer;
                        this.ImageAlign = System.Drawing.ContentAlignment.MiddleLeft;
                        this.TextAlign = System.Drawing.ContentAlignment.MiddleRight;
                        break;
                    default:
                        break;
                }
            }

        }
        #endregion

        /// <summary>
        /// 枚举图标类型
        /// </summary>
        public enum ButtonPresetImage
        {
            None,
            Check,
            Close,
            Cancel,
            Back,
            Down,
            Go,
            Up,
            Folder,
            Refresh,
            Setting,
            FolderOpen,
            DocumentDelete,
            Document,
            DocumentEdit,
            Info,
            DocumentAdd,
            Global,
            Calculator,
            Calendar,
            Printer
        }
    }

}

生成之后就会在工具箱找到该控件

同时在属性栏里可以选择图片