WPF DataGrid 改变单元格字体颜色

第一种方法，指定 DataGrid 里单元格的值是否符合用户自定义的条件，如果不，改变指定的颜色：

前台XAML代码：.

<Window x:Class="WpfDataGridCellColors.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:loca="clr-namespace:WpfDataGridCellColors"Title="MainWindow" Height="261" Width="649">
<Window.Resources><loca:ColorConverter x:Key="MyColorConvert"/></Window.Resources>
<Grid><DataGrid x:Name="dataGrid"CanUserDeleteRows="False" CanUserAddRows="False"AutoGenerateColumns="False" IsReadOnly="True"Background="White" GridLinesVisibility="All" Margin="5"ScrollViewer.VerticalScrollBarVisibility="Visible"ScrollViewer.HorizontalScrollBarVisibility="Visible"HeadersVisibility="Column" AlternationCount="2">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Title}" Header="项目" Width="150"/>
<DataGridTemplateColumn Width="150" ><DataGridTemplateColumn.HeaderTemplate><DataTemplate><TextBlock Text="A" /></DataTemplate></DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding IA}" VerticalAlignment="Center"HorizontalAlignment="Center" Foreground="{Binding IA,Converter={StaticResource MyColorConvert}}"/></DataTemplate></DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="150" ><DataGridTemplateColumn.HeaderTemplate><DataTemplate><TextBlock Text="B"/></DataTemplate></DataGridTemplateColumn.HeaderTemplate>
<DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding IB}" VerticalAlignment="Center"HorizontalAlignment="Center" Foreground="{Binding IB,Converter={StaticResource MyColorConvert}}"/></DataTemplate></DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Width="150" ><DataGridTemplateColumn.HeaderTemplate><DataTemplate><TextBlock Text="C" /></DataTemplate></DataGridTemplateColumn.HeaderTemplate><DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding IC}" VerticalAlignment="Center"HorizontalAlignment="Center" Foreground="{Binding IC,Converter={StaticResource MyColorConvert}}"/></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid></Grid></Window>

这里要注意的是定义DataGrid的列模板，首先是列标题模块：

<DataGridTemplateColumn.HeaderTemplate><DataTemplate><TextBlock Text="A" /></DataTemplate></DataGridTemplateColumn.HeaderTemplate>

然后是列的单元格模板：

<DataGridTemplateColumn.CellTemplate><DataTemplate><TextBlock Text="{Binding IA}" VerticalAlignment="Center"HorizontalAlignment="Center" Foreground="{Binding IA,Converter={StaticResource MyColorConvert}}"/></DataTemplate></DataGridTemplateColumn.CellTemplate>

这里的Foreground绑定后台生成的值 IA ，当IA符合用户定义的一些条件后，改变颜色。

条件判断与颜色转变在下面的IValueConverter类中。

（如果要改变单元格的背景颜色，只需把前台XAML中的Foreground改为Background即可）

后台代码：

namespace WpfDataGridCellColors{/// <summary>/// MainWindow.xaml 的交互逻辑/// </summary>public partial class MainWindow : Window{private List<Contrasts> _ContrastList;public List<Contrasts> ContrastList{get { return _ContrastList; }set{_ContrastList = value;}}
public MainWindow(){InitializeComponent();
ContrastList = new List<Contrasts>();
ContrastList.Add(new Contrasts(){Title = "减数",IA = 110,AFColor = Brushes.Black,IB = 220,BFColor = Brushes.Black,IC = 330,CFColor = Brushes.Green});
dataGrid.ItemsSource = ContrastList;}}
public class Contrasts{private string _Title;public string Title{get { return _Title; }set { _Title = value; }}
private double _IA;public double IA{get { return _IA; }set { _IA = value; }}
private double _IB;public double IB{get { return _IB; }set { _IB = value; }}
private double _IC;public double IC{get { return _IC; }set { _IC = value; }}
private SolidColorBrush _AFColor;public SolidColorBrush AFColor{get { return _AFColor; }set { _AFColor = value; }}
private SolidColorBrush _BFColor;public SolidColorBrush BFColor{get { return _BFColor; }set { _BFColor = value; }}
private SolidColorBrush _CFColor;public SolidColorBrush CFColor{get { return _CFColor; }set { _CFColor = value; }}}}
IValueConverter类：
using System;using System.Collections.Generic;using System.Windows.Data;using System.Windows;
namespace WpfDataGridCellColors{public class ColorConverter : IValueConverter{public object Convert(object value, Type typeTarget, object param, System.Globalization.CultureInfo culture){if (value == null){return "Black";}
if (System.Convert.ToDouble(value) >= 100.0 && System.Convert.ToDouble(value) < 200){return "Black";}
if (System.Convert.ToDouble(value) >= 200.0 && System.Convert.ToDouble(value) < 300){return "Green";}
if (System.Convert.ToDouble(value) >= 300.0){return "Red";}
return "Black";}public object ConvertBack(object value, Type typeTarget, object param, System.Globalization.CultureInfo culture){return "";}}}

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