MVVM DataGridTextColumn BindingProxy

Question

我目前正在使用WPF MVVM / Csharp中的一个项目。我会使用转换器来确定visibilitée列。

为此，我尝试通过代理绑定但没有结果。加载我的DataGrid，它永远不会通过转换器。

在我的XAML中：

 <DataGrid.Resources>
            <Helper:BindingProxy x:Key="proxy" Data="{Binding}"/>   
        </DataGrid.Resources>

XAML中的我的绑定代理：

public class BindingProxy : Freezable
{

    protected override Freezable CreateInstanceCore()
    {
        return new BindingProxy();
    }


    public object Data
    {
        get { return (object)GetValue(DataProperty); }
        set { SetValue(DataProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Data.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty DataProperty =
        DependencyProperty.Register("Data", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
}

我的文件绑定代理：

$productCollection = Mage::getResourceModel('catalog/product_collection')
                    ->addAttributeToSelect('sellingprice')
                    ->setStoreId($storeId)
                    ->joinField('category_id', 'catalog/category_product', 'category_id', 'product_id=entity_id', null, 'left')
                    ->addAttributeToFilter('category_id', array('in' => $_POST['category_id']))
                    ->addAttributeToFilter('status', array('eq' => 1))
                    ->addAttributeToFilter('dis_continue', array('eq' => 0));



$productCollection->addAttributeToFilter('seller_id', array('in' => $seller_list));

$productCollection->addExpressionAttributeToSelect(
                    'lowest_price', 'IF(({{special_from_date}}<=now() AND {{special_to_date}}>=now() OR {{special_from_date}} IS NULL AND {{special_price}}>0),{{special_price}},IF({{sellingprice}}>0,{{sellingprice}},{{price}}))', array('special_from_date', 'special_to_date', 'special_price', 'sellingprice', 'price'));


$productCollection->getSelect()->columns('MIN(IF((IF(at_special_from_date.value_id > 0, at_special_from_date.value, at_special_from_date_default.value)<=now() AND IF(at_special_to_date.value_id > 0, at_special_to_date.value, at_special_to_date_default.value)>=now() OR IF(at_special_from_date.value_id > 0, at_special_from_date.value, at_special_from_date_default.value) IS NULL AND at_special_price.value>0),at_special_price.value,IF(at_sellingprice.value>0,at_sellingprice.value,at_price.value))) as l_price')->group('product_name');