wpf - 如何让网格为空白单元格绘制边框？

Question

我有一个 ItemsControl，它使用 aGrid作为ItemsPanelTemplate，并在 Grid.Column 和 Grid.Row 上设置ItemContainerStyle以在网格中定位数据项

有没有办法将 GridLines 添加到网格中，或者用边框填充空白单元格？

现在我已经ShowGridLines设置为 True 虚线，但是我希望显示水平线，我更喜欢实心 GridLines

有相当多的 XAML，但这里是我的 XAML 布局的屏幕截图：

Answer 1

抱歉，无法设置网格线的样式。至少不是以简单的方式。请参阅以下问题以获取解释：如何更改 WPF 中网格的网格线颜色？

MSDN 文档说“只有虚线可用，因为此属性旨在用作调试布局问题的设计工具，而不是用于生产质量代码。如果您希望网格内的线条，请将网格内的元素设置为具有边框。”

编辑：如果你想要边框，你可以创建一个自定义Grid并绘制控件的GridLinesinOnRender方法。

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

    namespace BorderGridControl
    {
        public class GridControl : Grid
        {
            #region Properties
            public bool ShowCustomGridLines
            {
                get { return (bool)GetValue(ShowCustomGridLinesProperty); }
                set { SetValue(ShowCustomGridLinesProperty, value); }
            }

            public static readonly DependencyProperty ShowCustomGridLinesProperty =
                DependencyProperty.Register("ShowCustomGridLines", typeof(bool), typeof(GridControl), new UIPropertyMetadata(false));

            
            public Brush GridLineBrush
            {
                get { return (Brush)GetValue(GridLineBrushProperty); }
                set { SetValue(GridLineBrushProperty, value); }
            }

            public static readonly DependencyProperty GridLineBrushProperty =
                DependencyProperty.Register("GridLineBrush", typeof(Brush), typeof(GridControl), new UIPropertyMetadata(Brushes.Black));

            public double GridLineThickness
            {
                get { return (double)GetValue(GridLineThicknessProperty); }
                set { SetValue(GridLineThicknessProperty, value); }
            }

            public static readonly DependencyProperty GridLineThicknessProperty =
                DependencyProperty.Register("GridLineThickness", typeof(double), typeof(GridControl), new UIPropertyMetadata(1.0));
            #endregion

            protected override void OnRender(DrawingContext dc)
            {
                if (ShowCustomGridLines)
                {
                    foreach (var rowDefinition in RowDefinitions)
                    {
                        dc.DrawLine(new Pen(GridLineBrush, GridLineThickness), new Point(0, rowDefinition.Offset), new Point(ActualWidth, rowDefinition.Offset));
                    }

                    foreach (var columnDefinition in ColumnDefinitions)
                    {
                        dc.DrawLine(new Pen(GridLineBrush, GridLineThickness), new Point(columnDefinition.Offset, 0), new Point(columnDefinition.Offset, ActualHeight));
                    }
                    dc.DrawRectangle(Brushes.Transparent, new Pen(GridLineBrush, GridLineThickness), new Rect(0, 0, ActualWidth, ActualHeight));
                }
                base.OnRender(dc);
            }
            static GridControl()
            {
                DefaultStyleKeyProperty.OverrideMetadata(typeof(GridControl), new FrameworkPropertyMetadata(typeof(GridControl)));
            }
        }
    }

我试过了，它似乎工作得很好。

这里是一个使用示例：

    <controls:GridControl ShowCustomGridLines="True"
                          GridLineBrush="Red"
                          GridLineThickness="1">
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
    </controls:GridControl>