如何通过IValueConverter为DataGrid的列绑定样式？

效果：

App.xaml

 

<Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             x:Class="SilverlightApplication15.App"
             xmlns:app="clr-namespace:SilverlightApplication15">
    <Application.Resources>
        <app:DemoComparableConverter x:Key="ComparableConverter"/>
    </Application.Resources>
</Application>

Page1.xaml

<UserControl x:Class="SilverlightApplication15.Page1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" 
    d:DesignHeight="300" d:DesignWidth="400" 
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">
    
    <Grid x:Name="LayoutRoot" Background="White">
        <sdk:DataGrid AutoGenerateColumns="False"  Name="dataGrid1" >
            <sdk:DataGrid.Columns>
                <sdk:DataGridTextColumn Binding="{Binding Caption}" Header="Caption" />
                <sdk:DataGridTextColumn Binding="{Binding Value}"  Header="Value"/>
                <sdk:DataGridTemplateColumn    Header="Value">
                    <sdk:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Value}" VerticalAlignment="Center" 
                                       Style="{Binding Converter={StaticResource ComparableConverter}}" />
                        </DataTemplate>
                    </sdk:DataGridTemplateColumn.CellTemplate>
                </sdk:DataGridTemplateColumn>
            </sdk:DataGrid.Columns>
        </sdk:DataGrid>
    </Grid>
</UserControl>

PS：这是在2010 RC中生成的代码，发现 DataGrid 的引用不是来自程序集了，而是来自 xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"

Page1.xaml.cs

namespace SilverlightApplication15
{
    public partial class Page1 : UserControl
    {
        public Page1()
        {
            InitializeComponent();

            this.Loaded +=(sender ,e)=>
            {
                this.BindControls();
            };
        }
        void BindControls()
        {
            ObservableCollection<DemoComparableClass> demos = new ObservableCollection<DemoComparableClass>();
            demos.Add( new DemoComparableClass("名称A",101) );
            demos.Add(new DemoComparableClass("名称B", 51));
            demos.Add(new DemoComparableClass("名称C", 201));

            this.dataGrid1.ItemsSource = demos;
        }
    }
}


其他 class

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
namespace SilverlightApplication15
{
    public enum Results
    {
        Normal , Above , Below
    }
    public class DemoComparableClass
    {
        public string Caption { get; set; }

        public int Value { get; set; }

        public DemoComparableClass(string c , int v)
        {
            this.Caption = c;
            this.Value = v;
        }

        public Results Result
        {
            get
            {
                if (this.Value > 100 && this.Value < 200)
                {
                    return Results.Normal;
                }
                else if (this.Value >= 200)
                {
                    return Results.Above;
                }
                else 
                {
                    return Results.Below;
                }
            }
        }
    }

    public class DemoComparableConverter : System.Windows.Data.IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is DemoComparableClass)
            {
                DemoComparableClass v = (DemoComparableClass)value;
                if (targetType.Equals(typeof(Style)))
                {
                    Style s = new Style(typeof(TextBlock));
                    switch (v.Result)
                    {
                        case Results.Normal:
                            s.Setters.Add(new Setter(TextBlock.ForegroundProperty , new SolidColorBrush(Colors.Brown)));
                            break;
                        case Results.Above:
                            s.Setters.Add(new Setter(TextBlock.ForegroundProperty , new SolidColorBrush(Colors.Red)));
                            s.Setters.Add(new Setter(TextBlock.FontWeightProperty, FontWeights.Bold ));
                            break;
                        case Results.Below:
                            s.Setters.Add(new Setter(TextBlock.ForegroundProperty , new SolidColorBrush(Colors.Green)));
                            break;
                    }
                    return s;
                }
                else if (targetType.Equals(typeof(Brush)))
                {
                    switch (v.Result)
                    {
                        case Results.Normal:
                            return new SolidColorBrush(Colors.Brown);
                        case Results.Above:
                            return new SolidColorBrush(Colors.Red);
                        case Results.Below:
                            return new SolidColorBrush(Colors.Green);
                    }
                }
            }
            return null;
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

要实现的功能很简单，就是通过 DemoComparableConverter 让 DataGrid 中的单元格显示出不同的样式，我试了半天，得出几点：
1. DataGridTextColumn 只有一个依赖项属性 FontFamilyProperty ，无法以

 <sdk:DataGridTextColumn Binding="{Binding Value}"  Header="Value"
                   Foreground="{Binding Converter={StaticResource ComparableConverter}}"/>
方式进行绑定；

2. 似乎只能使用 DataGridTemplateColumn ，并对 DataTemplate 中的控件进行 Style、Foreground、Background 等依赖项属性的绑定了；

3. 如果碰上要动态的为DataGrid添加列的情况（如上面的效果图所示，“单价、价格、交货日期”等列是根据用户的选择而决定要不要显示的，可能还会有诸如“运费、管理费、折扣率、税收”等等可供选择的列，又或者是要显示各个代理商在1-12月的销售情况的数据透视表，这些都是动态显示列的例子），则只能通过后台代码为 DataGrid 增加DataGridTemplateColumn ，那么如何在代码中为 DataTemplate 中的控件进行 Style、Foreground、Background 等依赖项属性的绑定？ 目前我是通过加载动态 DataTemplate 来实现，感觉比较麻烦：

DataGridTemplateColumn col = new DataGridTemplateColumn();
col.Header = header; // header 为表头标题
col.CellTemplate = (DataTemplate)System.Windows.Markup.XamlReader.Load(
                        GetNumericTemplate(propertyName)); // propertyName 为要被绑定的属性名

public string GetDateTemplate(string propertyName)
{
        string template = @"
<DataTemplate
    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'>
            <TextBlock Text='{Binding @PropertyName}' 
                       Style='{Binding Converter={StaticResource ComparableConverter}}'
                        VerticalAlignment='Center' />
</DataTemplate>";
       return template.Replace("@PropertyName", propertyName);
}

加载动态 DataTemplate 还可以直接使用 Resources ，但是我不知道该如何动态的指定 propertyName

　　　　col.CellTemplate =(DataTemplate) this.Resources["ADataTemplate"];


不知各位有没有更方便的方法？或者网络上早已有正解~~~~