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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | 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); } } } } |
希望本文所述对大家的C#程序设计有所帮助。