你如何将数据传递到XAML的的IValueConverter？ [英] How do you pass data into an IValueConverter in XAML?

问题描述

我有一个的IValueConverter其工作是一个BLOCKID转换为ConditionLabel。问题是，我的模型对象是具有智慧做实际的转换。我的代码看起来像这样，到目前为止...

I have an IValueConverter whose job it is to convert a BlockId to a ConditionLabel. The problem is that my Model object is what has the smarts to do the actual conversion. My code looks like this so far...

public class BlockIdToConditionLabelConverter : IValueConverter
{
    private Model _model;

    public BlockIdToConditionLabelConverter(Model model)
    {
        _model = model;
    }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        int blockId = (int)value;
        return _model.BlockIdToConditionLabel(blockId);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return Binding.DoNothing;
    }
}

目前，我创建了一个静态资源ResourceDictionary中像这样的（后来是指它在一个DataTemplate）：

At the moment, I create a static resource in a ResourceDictionary like this (and later refer to it in a DataTemplate):

<local:BlockIdToConditionLabelConverter
    x:Key="_blockIdToConditionLabelConverter" />

现在的问题是，我需要一种方法来我的Model对象传递到该转换器。我会怎么做呢？

The problem is, I need a way to pass my Model object into this converter. How would I do that?

感谢。

推荐答案

这是一个经典的问题，价值转换器。

This is a classic problem with value converters.

如果您正在使用MVVM模式，你可以通过实现模型的视图模型内的转换解决这个问题。

If you are using MVVM pattern, you can solve that problem by implementing the conversion inside the ViewModel of your model.

如果没有，你可以看看的这个职位上MSDN论坛。 （回答从萨姆特 - MSFT）

If not, you can take a look at this post on MSDN forums. (answer from Sam Bent - MSFT)

的目标是使用multibinding到模型传递到您的转换器，在这种情况下，通过在DataContext

The goal is to use multibinding to pass the model to your converter, in this case, pass the DataContext.

这篇关于你如何将数据传递到XAML的的IValueConverter？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！