C#（WPF）为Grid添加实线边框。

原文: C#（WPF）为Grid添加实线边框。

相信大家在做WPF项目的时候，都会用到Grid这个布局控件，一般情况下，如果只是为了布局，那就不需要显示它的边框，但是也有特殊需求，如果把它当做表格来使用，那就需要为它添加实线边框。下面帖代码：

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

 

namespace WPFStart
{
    ///
    /// 为Grid添加的一个特殊功能，实线边框
    ///
    public class GridHelper
    {
        //边框的宽度
        static double myBorderWidth = 1;

        public static double GetBorderWidth(DependencyObject obj)
        {
            return (double)obj.GetValue(BorderWidthProperty);
        }

        public static void SetBorderWidth(DependencyObject obj, double value)
        {
            obj.SetValue(BorderWidthProperty, value);
        }

        public static readonly DependencyProperty BorderWidthProperty =
            DependencyProperty.RegisterAttached("BorderWidth", typeof(double), typeof(GridHelper), new PropertyMetadata(OnBorderWidthChanged));

        private static void OnBorderWidthChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            myBorderWidth = (double)e.NewValue;
        }

        public static bool GetShowBorder(DependencyObject obj)
        {
            return (bool)obj.GetValue(ShowBorderProperty);
        }

        public static void SetShowBorder(DependencyObject obj, bool value)
        {
            obj.SetValue(ShowBorderProperty, value);
        }

        public static readonly DependencyProperty ShowBorderProperty =
            DependencyProperty.RegisterAttached("ShowBorder", typeof(bool), typeof(GridHelper), new PropertyMetadata(OnShowBorderChanged));

        //这是一个事件处理程序，需要手工编写，必须是静态方法
        private static void OnShowBorderChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var grid = d as Grid;
            if ((bool)e.OldValue)
            {
                grid.Loaded -= (s, arg) => { };
            }
            if ((bool)e.NewValue)
            {
                grid.Loaded += (s, arg) =>
                {
                    //根据Grid的顶层子控件的个数去添加边框，同时考虑合并的情况
                    var controls = grid.Children;
                    var count = controls.Count;
                    for (int i = 0; i < count; i++)
                    {