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 classGridHelper
    {
       //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, doublevalue)
       {
           obj.SetValue(BorderWidthProperty, value);
       }

       public static readonly DependencyProperty BorderWidthProperty=
           DependencyProperty.RegisterAttached("BorderWidth", typeof(double),typeof(GridHelper), newPropertyMetadata(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, boolvalue)
       {
           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++)
                   {
                       var item = controls[i] as FrameworkElement;
                       var row = Grid.GetRow(item);
                       var column = Grid.GetColumn(item);
                       var rowspan = Grid.GetRowSpan(item);
                       var columnspan = Grid.GetColumnSpan(item);

                       //设置边框线的颜色
                       var border = new Border();
                       border.BorderBrush = new SolidColorBrush(Colors.White);

                       if (row == grid.RowDefinitions.Count - 1 && column ==grid.ColumnDefinitions.Count - 1)
                           border.BorderThickness = new Thickness(myBorderWidth);
                       else if (row == grid.RowDefinitions.Count - 1)
                           border.BorderThickness = new Thickness(myBorderWidth,myBorderWidth, 0, 0);
                       else if (column == grid.ColumnDefinitions.Count - 1)
                           border.BorderThickness = new Thickness(myBorderWidth,myBorderWidth, myBorderWidth, 0);
                       else
                           border.BorderThickness = new Thickness(myBorderWidth,myBorderWidth,0, 0 );

                       Grid.SetRow(border, row);
                       Grid.SetColumn(border, column);
                       Grid.SetRowSpan(border, rowspan);
                       Grid.SetColumnSpan(border, columnspan);
                       grid.Children.Add(border);
                   }
               };
           }
       }
    }
}

在项目中新建这个类，在XAML页面引用设置属性时，需要添加“xmlns:ext="clr-namespace:WPFGrid（项目名称）"“，“ext:GridHelper.ShowBorder="true"”这里就是设置边框是否显示了。

WPF XAML技术交流群：477319939