c#通过重写panel改变边框颜色与宽度的方法（c#通过重写panel改变边框颜色与宽度的方法）

本文实例讲述了C#通过重写Panel改变边框颜色与宽度的方法。分享给大家供大家参考。具体实现方法如下：

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293 using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.ComponentModel;using System.Windows.Forms;using System.Drawing;namespace ImageStudio{public class PanelEx : System.Windows.Forms.Panel{[DllImport("user32.dll")]private static extern IntPtr GetWindowDC(IntPtr hwnd);[DllImport("user32.dll")]private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);private Color _borderColor = Color.Black;private int _borderWidth = 1;//// 摘要:// 获取或设置控件的边框颜色。//// 返回结果:// 控件的边框颜色 System.Drawing.Color。默认为 System.Drawing.Color.Black// 属性的值。[Description("组件的边框颜色。"), Category("Appearance")]public Color BorderColor{get{return _borderColor;}set{_borderColor = value;this.Invalidate();}}//// 摘要:// 获取或设置控件的边框宽度。//// 返回结果:// 控件的边框宽度 int。默认为 1// 属性的值。[Description("组件的边框宽度。"), Category("Appearance")]public int BorderWidth{get{return _borderWidth;}set{_borderWidth = value;this.Invalidate();}}public PanelEx(){SetStyle(ControlStyles.DoubleBuffer, true);SetStyle(ControlStyles.AllPaintingInWmPaint, false);SetStyle(ControlStyles.ResizeRedraw, true);SetStyle(ControlStyles.UserPaint, true);SetStyle(ControlStyles.SupportsTransparentBackColor, true);this.Paint+=new PaintEventHandler(PanelEx_Paint);}private void PanelEx_Paint(object sender, PaintEventArgs e){if (this.BorderStyle == BorderStyle.FixedSingle){IntPtr hDC = GetWindowDC(this.Handle);Graphics g = Graphics.FromHdc(hDC);ControlPaint.DrawBorder(g,new Rectangle(0, 0, this.Width, this.Height),_borderColor,_borderWidth,ButtonBorderStyle.Solid,_borderColor,_borderWidth,ButtonBorderStyle.Solid,_borderColor,_borderWidth,ButtonBorderStyle.Solid,_borderColor,_borderWidth,ButtonBorderStyle.Solid);g.Dispose();ReleaseDC(Handle, hDC);}}}}