C# WinForm窗体控件GroupBox修改边框颜色控件

C# WinForm窗体控件GroupBox修改边框颜色控件

1.新建组件这里可以自定义一个GroupBox控件起名为GroupBoxEx

2.增加一个BoderColor属性

         private Color _BorderColor = Color.Black;

         [Browsable(true),Description("边框颜色"),Category("自定义分组")]
         public Color BorderColor
         {
             get { return _BorderColor; }
             set
             {
                 _BorderColor = value;
                 this.Invalidate();
             }
         }

3.控件代码继承GroupBox

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

 namespace ControlLibrary
 {
     public partial class GroupBoxEx : GroupBox
     {
         private Color _BorderColor = Color.Black;

         [Browsable(true),Description("边框颜色"),Category("自定义分组")]
         public Color BorderColor
         {
             get { return _BorderColor; }
             set
             {
                 _BorderColor = value;
                 this.Invalidate();
             }
         }

         public GroupBoxEx()
         {
             InitializeComponent();
         }

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

             InitializeComponent();
         }

         /// <summary>
         /// 重写Onpaint
         /// </summary>
         /// <param name="e"></param>
         protected override void OnPaint(PaintEventArgs e)
         {
             //base.OnPaint(e);
             var vSize = e.Graphics.MeasureString(this.Text,this.Font);

             e.Graphics.Clear(this.BackColor);
             e.Graphics.DrawString(this.Text, this.Font, new SolidBrush(this.ForeColor), , );
             Pen vPen = new Pen(this._BorderColor);
             e.Graphics.DrawLine(vPen, , vSize.Height / , , vSize.Height / );
             e.Graphics.DrawLine(vPen, vSize.Width + , vSize.Height / , this.Width - , vSize.Height / );
             e.Graphics.DrawLine(vPen, , vSize.Height / , , this.Height - );
             e.Graphics.DrawLine(vPen, , this.Height - , this.Width - , this.Height - );
             e.Graphics.DrawLine(vPen, this.Width - , vSize.Height / , this.Width - , this.Height - );
         }
     }
 }

4.添加测试窗体并添加GroupBoxEx控件

编译运行

源代码工程文件下载