值转换器-在ConvertBack()方法中访问Convert()变量? [英] Value Converters - Access Convert() variables in ConvertBack() method?

问题描述

我有一个转换器，该转换器具有几个输入变量(一个对象和一个TextBox)，然后返回TextBox.Text String属性.

I have a converter which has a couple of input variables (an object and a TextBox) and then returns the TextBox.Text String property.

我遇到的问题是转换器的ConvertBack()方法.我无法将任何更新链接回该对象，因为我得到的只是一个字符串(文本框的文本).有什么方法可以访问某些(如果不是全部)Convert()变量?或者至少知道哪个文本框正在调用ConvertBack()?

The problem I'm running into is in the ConvertBack() Method of my converter. I have no way of linking any updates back to the object since all I get is a String (the Text of the Textbox). Is there some way I can access some (if not all) the Convert() variables? Or at least know which textbox is calling ConvertBack()?

这是我的ItemsControl代码:

Here is my ItemsControl Code:

<ItemsControl x:Name="ItemsControlGrid" ItemsSource="{Binding Path=ProjectOrganLocation.LesionTypes, Source={StaticResource Locator}}" >
    <ItemsControl.ItemsPanel>
         <ItemsPanelTemplate>
              <StackPanel Orientation="Horizontal" />
         </ItemsPanelTemplate>
     </ItemsControl.ItemsPanel>
     <ItemsControl.ItemTemplate>
         <DataTemplate>
              <TextBox Width="75" TextAlignment="Center" >
                   <TextBox.Text>
                         <MultiBinding Converter="{StaticResource LesionTypeConverter}"  >
                              <Binding RelativeSource="{RelativeSource AncestorType={x:Type TreeViewItem}}" Path="DataContext.OrganLocation"/>
                              <Binding RelativeSource="{RelativeSource Self}" Path="." />
                          </MultiBinding>
                    </TextBox.Text>
                </TextBox>
            </DataTemplate>
      </ItemsControl.ItemTemplate>
 </ItemsControl>

这是我的转换器的摘录:

And here's a snippet from my Converter:

List<CategoryCode> Lesions = organ.getLesionTypes;

    if (organ.OrganDisplayName == organ.CurrentOrgan)
       organ.Count++;
    else
    {
       organ.Count = 0;
       organ.CurrentOrgan = organ.OrganDisplayName;
    }
return organ.Labels[organ.Count].LabelPrefix;

推荐答案

您最好的选择是将一个私有属性添加到转换器类并在Convert期间存储您的值，以便ConvertBack可以访问它们.不过，您需要为每个绑定使用单独的转换器实例.

Your best bet would be to add a private property to the converter class and store your values during Convert so that ConvertBack can access them. You would need to use a separate instance of the converter for each binding though.

您要完成什么?可能有比转换器更好的方法

What are you trying to accomplish? There might be a better way to do it than a converter

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