如何在WPF中更改网格的网格线颜色？

Question

我有一个Grid（不是DataGrid，而是真正的Grid），其中GridLines设置为True。如何更改网格线的颜色？在XAML中硬编码是可以的，因为这只是为了开发目的。

<Grid ShowGridLines="True" />

- Natrium

---

你是指网格(Grid)还是数据网格(DataGrid)？我在Grid上没有看到GridLines属性。 - Andy

Answer 1

抱歉，使用ShowGridLines无法实现 - 您需要样式化包含的元素。

示例A：

MSDN文档称：“仅提供虚线，因为此属性旨在作为调试布局问题的设计工具，并不适用于生产质量代码。如果要在Grid内部创建线，请将Grid内的元素样式化为具有边框。”

示例B - WPF源代码：

请注意，在这个密封的内部类中硬编码了Brushes.Blue和Brushes.Yellow，System.Windows.Controls.Grid使用此类来绘制线条。

来自Grid.cs

    /// <summary>
    /// Helper to render grid lines. 
    /// </summary>
    internal class GridLinesRenderer : DrawingVisual 
    { 
        /// <summary>
        /// Static initialization 
        /// </summary>
        static GridLinesRenderer()
        {
            s_oddDashPen = new Pen(Brushes.Blue, c_penWidth); 
            DoubleCollection oddDashArray = new DoubleCollection();
            oddDashArray.Add(c_dashLength); 
            oddDashArray.Add(c_dashLength); 
            s_oddDashPen.DashStyle = new DashStyle(oddDashArray, 0);
            s_oddDashPen.DashCap = PenLineCap.Flat; 
            s_oddDashPen.Freeze();

            s_evenDashPen = new Pen(Brushes.Yellow, c_penWidth);
            DoubleCollection evenDashArray = new DoubleCollection(); 
            evenDashArray.Add(c_dashLength);
            evenDashArray.Add(c_dashLength); 
            s_evenDashPen.DashStyle = new DashStyle(evenDashArray, c_dashLength); 
            s_evenDashPen.DashCap = PenLineCap.Flat;
            s_evenDashPen.Freeze(); 
        }

- jschroedl

Answer 2

var T = Type.GetType("System.Windows.Controls.Grid+GridLinesRenderer," +
    " PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");

var GLR = Activator.CreateInstance(T);
GLR.GetType().GetField("s_oddDashPen", BindingFlags.Static | BindingFlags.NonPublic).SetValue(GLR, new Pen(Brushes.Black, 1.0));
GLR.GetType().GetField("s_evenDashPen", BindingFlags.Static | BindingFlags.NonPublic).SetValue(GLR, new Pen(Brushes.Black, 1.0));

myGrid.ShowGridLines = true;

- igalk474

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谢谢 +1。我没想到会这样做。通过使用反射，您可以绕过类是内部的事实？ - eran otzap

如果你将两支笔都设置为橙色，那么它看起来非常舒适 :) - EricG

Answer 3

这个答案并不是真正改变网格线的方法，而是通过一种非常简单的方式使其看起来像是已经改变了。我相信其他人有更好的做法，但这是我展示网格线的方法。

<Grid Height="115" Margin="0,0,0,0" ShowGridLines="False">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="220"/>
                                    <ColumnDefinition Width="220"/>
                                    <ColumnDefinition Width="200*"/> 
                                </Grid.ColumnDefinitions>
                                <Border Grid.Column="0" BorderBrush="White" BorderThickness="1">
                                </Border>
                                <Border Grid.Column="1" BorderBrush="White" BorderThickness="1">                      
                                </Border>
                                <Border Grid.Column="2" BorderBrush="White" BorderThickness="1">        
                                </Border>
                            </Grid>

创建列定义或网格定义的边框，并将Grid.Column属性设置为您想要的任何内容。然后，您可以设置颜色、厚度或样式。简单又直观。希望这能帮助其他人！下面是该网格的图像：

- JLott

Answer 4

<Window.Resources>
   <SolidColorBrush x:Key="RedGridLine" Color="#FFFF4444" />
   <SolidColorBrush x:Key="BlueGridLine" Color="#554444FF"/>
</Window.Resources>

<my:DataGrid VerticalGridLinesBrush="{StaticResource RedGridLine}"
        HorizontalGridLinesBrush="{StaticResource BlueGridLine}" >
...
</my:DataGrid>

参考：http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/0202b0dd-38d9-4ad7-8576-d115922aeeec/

- Ravi Shankar

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有趣。这实际上对我有帮助，因为我正在搜索数据表格(DataGrid)。 - dotNET

Answer 5

这是igalk474的答案的扩展，用于：

<FixedPage.Resources>
  <local:GridLinesRenderer x:Key="glr" StrokeColor="Black" StrokeWidth="1.0" />
</FixedPage.Resources>

...

<Grid ShowGridLines="True">
...
</Grid>

其中local是本地程序集，而FixedPage是任何FrameworkElement。

using System;
using System.Reflection;
using System.Windows;
using System.Windows.Media;

namespace mynamespace.xaml {
    public class GridLinesRenderer : DependencyObject {

        public static readonly DependencyProperty StrokeWidthProperty = DependencyProperty.Register(
            "StrokeWidth", typeof(double), typeof(GridLinesRenderer), new PropertyMetadata(1.0, OnPropertyChanged)
        );

        public static readonly DependencyProperty StrokeColorProperty = DependencyProperty.Register(
            "StrokeColor", typeof(SolidColorBrush), typeof(GridLinesRenderer), new PropertyMetadata(Brushes.Black, OnPropertyChanged)
        );

        public double StrokeWidth {
            get { return (double)GetValue(StrokeWidthProperty); }
            set { SetValue(StrokeWidthProperty, value); }
        }

        public SolidColorBrush StrokeColor {
            get { return (SolidColorBrush)GetValue(StrokeColorProperty); }
            set { SetValue(StrokeColorProperty, value); }
        }

        public GridLinesRenderer() {
            OnPropertyChanged(this, new DependencyPropertyChangedEventArgs());
        }

        private static void OnPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e) {
            Type T = Type.GetType("System.Windows.Controls.Grid+GridLinesRenderer," +
                "PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35");
            var glr = Activator.CreateInstance(T);
            Pen glrPen = new Pen(((GridLinesRenderer)source).StrokeColor, ((GridLinesRenderer)source).StrokeWidth);
            glr.GetType().GetField("s_oddDashPen", BindingFlags.Static | BindingFlags.NonPublic).SetValue(glr, glrPen);
            glr.GetType().GetField("s_evenDashPen", BindingFlags.Static | BindingFlags.NonPublic).SetValue(glr, glrPen);
        }

    }
}

- primo