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), 10, 1);
            Pen vPen = new Pen(this._BorderColor);
            e.Graphics.DrawLine(vPen, 1, vSize.Height / 2, 8, vSize.Height / 2);
            e.Graphics.DrawLine(vPen, vSize.Width + 8, vSize.Height / 2, this.Width - 2, vSize.Height / 2);
            e.Graphics.DrawLine(vPen, 1, vSize.Height / 2, 1, this.Height - 2);
            e.Graphics.DrawLine(vPen, 1, this.Height - 2, this.Width - 2, this.Height - 2);
            e.Graphics.DrawLine(vPen, this.Width - 2, vSize.Height / 2, this.Width - 2, this.Height - 2); 
        }
    }
}

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

出处：https://www.cnblogs.com/JiYF/p/9015217.html