如何使用C#代码实现DataTemplate

不得不说DataTemplate是WPF中的一项重要技术组成，可以方便让我们实现各种各样的UI样式，大大丰富了应用程序的界面设计。通常我们都会在XAML文件中定义出具体的DataTemplate, 我举一个ListView的例子：

<ListView IsSynchronizedWithCurrentItem="True" Background="#FFFFFFFF" 

Foreground="White" ItemsSource="{Binding}" Style="{DynamicResource 
SuperListViewStyle}" ItemContainerStyleSelector="{StaticResource 
listViewItemStyleSelector}" x:Name="lvExecutionTable" >
                        <ListView.View>
                            <GridView>
                                <GridViewColumn>
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <CheckBox HorizontalAlignment="Center" 
IsChecked="{Binding Path=IsSelected}"/>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                    <GridViewColumnHeader Content="选择" 
Tag="IsSelected"/>
                                </GridViewColumn>
                                <GridViewColumn>
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock Text="{Binding 
Path=IsComfirmed, Converter={StaticResource IsComfirmedConverter}}" 
Foreground="{Binding Path=IsComfirmed, Converter={StaticResource 
IsComfirmedToColorConverter}}"/>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                    <GridViewColumnHeader Content="确认状态" 
Tag="IsComfirmed"/>
                                </GridViewColumn>
                                <GridViewColumn DisplayMemberBinding="{Binding 
Path=MarketIndicator}">
                                    <GridViewColumnHeader Content="市场类型" 
Tag="MarketIndicator"/>
                                </GridViewColumn>
                                <GridViewColumn>
                                    <GridViewColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBlock Text="{Binding 
Path=TradeType}"/>
                                        </DataTemplate>
                                    </GridViewColumn.CellTemplate>
                                    <GridViewColumnHeader Content="成交方式" 
Tag="TradeType"/>
                                </GridViewColumn>
                            </GridView>
                        </ListView.View>
                    </ListView>

例子中对每个Column定义了简单的DataTemplate。我遇到的问题是如果这个List View需要动态编辑列，或者新加入一些列，就是如何用代码来实现对控件的DataTemplate的操作。经过查阅MSDN的相关文档，最好找到了解决的办法，如下：

GridViewColumn column = new GridViewColumn();
            GridViewColumnHeader h = new GridViewColumnHeader();
            h.Content = "??????";
            h.Tag = "*******";
            column.Header = h;
            DataTemplate dt = new DataTemplate();
            FrameworkElementFactory fef = new FrameworkElementFactory(typeof

(CheckBox));
            Binding binding = new Binding();
            binding.Path = new PropertyPath("MarketIndicator");
            fef.SetBinding(CheckBox.ContentProperty, binding);
            fef.SetValue(CheckBox.ForegroundProperty, Brushes.White);
            dt.VisualTree = fef;
            column.CellTemplate = dt;
            (this.lvExecutionTable.View as GridView).Columns.Add(column);

DataTemplate对象的VisualTree属性的类型是FrameworkElementFactory，用来存放具体的Control。FrameworkElementFactory fef = new FrameworkElementFactory(typeof(CheckBox))语句定义了DataTemplate的顶层元素是一个CheckBox控件，使用fef.SetValue方法可以设置顶层元素的属性，如绑定等等。如果你需要定义的DataTemplate不止一个层次，那么你就要花点时间去设置顶层元素的Content属性。

【编辑推荐】

1. 浅析C#3.0编码习惯与命名规则
2. 详解C# 4.0中必选参数与可选参数混合的问题
3. 深入解析C#编程中的方法重载