C#继承Control实用自定义控件

本文转载自查看原文 2012-04-27 10:22 5937 winForm

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

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