C#继承Control实用自定义控件

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start

步骤一：新建类库项目，新建FirstControl.cs

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

using System.Windows.Forms;

using System.Drawing;

using System.ComponentModel;

 

namespace UcDll

{

    public class FirstControl : Control

    {

 

        public FirstControl()

        {

 

        }

 

        // ContentAlignment is an enumeration defined in the System.Drawing

        // namespace that specifies the alignment of content on a drawing

        // surface.

        private ContentAlignment alignmentValue = ContentAlignment.MiddleLeft;

 

        [

        Category("Alignment"),

        Description("Specifies the alignment of text.")

        ]

        public ContentAlignment TextAlignment

        {

 

            get

            {

                return alignmentValue;

            }

            set

            {

                alignmentValue = value;

 

                // The Invalidate method invokes the OnPaint method described

                // in step 3.

                Invalidate();

            }

        }

 

 

        protected override void OnPaint(PaintEventArgs e)

        {

            base.OnPaint(e);

            StringFormat style = new StringFormat();

            style.Alignment = StringAlignment.Near;

            switch (alignmentValue)

            {

                case ContentAlignment.MiddleLeft:

                    style.Alignment = StringAlignment.Near;

                    break;

                case ContentAlignment.MiddleRight:

                    style.Alignment = StringAlignment.Far;

                    break;

                case ContentAlignment.MiddleCenter:

                    style.Alignment = StringAlignment.Center;

                    break;

            }

 

            // Call the DrawString method of the System.Drawing class to write  

            // text. Text and ClientRectangle are properties inherited from

            // Control.

            e.Graphics.DrawString(

                Text,

                Font,

                new SolidBrush(ForeColor),

                ClientRectangle, style);

 

        }

    }

}

 

步骤二：编译，添加项目引用即可。

这里的重点是控件界面也要由自己绘。

url:http://greatverve.cnblogs.com/archive/2012/04/27/control-Inherit.html

参考：

http://www.cnblogs.com/guanjinke/category/77694.html

http://blog.csdn.net/yysyangyangyangshan/article/details/7078471

凡事以大气象去面对，优秀是一种习惯。