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~~~~