将字典绑定到WinRT ListBox

Question

我已经阅读了很多关于将Dictionary绑定到WPF ListView和ListBox的帖子,但我无法获得在WinRT中工作的等效代码.

<Grid Margin="10" Width="1000" VerticalAlignment="Stretch">
        <ListBox Name="StatListView" ItemsSource="{Binding FooDictionary}" >
            <ListBox.ItemTemplate>
                <DataTemplate >
                    <Grid Margin="6">
                        <StackPanel Orientation="Horizontal" >
                            <TextBlock Text="{Binding Key}" Margin="5" />
                            <TextBlock Text="{Binding Value}" Margin="5" />
                        </StackPanel>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>


    public Dictionary<string, string> FooDictionary
    {
        get
        {
            Dictionary<string, string> temp = new Dictionary<string, string>();
            temp.Add("key1", "value1");
            temp.Add("key2", "value2");
            temp.Add("key3", "value3");
            temp.Add("key4", "value4");
            return temp;
        }
    }

什么是正确的绑定？

Answer 1

输出窗口中的错误是(修剪到最有用的部分):

Error: Cannot get 'Key' value (type 'String') from type 
'System.Runtime.InteropServices.WindowsRuntime.CLRIKeyValuePairImpl`2
[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, 
Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, ....

在内部,WinRT将类型转换为:

System.Runtime.InteropServices.WindowsRuntime.CLRIKeyValuePairImpl<K, V>

如果您添加到DataTemplate:

<TextBlock Text="{Binding}" Margin="5" />

你会看到它发出上面的类型String, String.

但是,出于某种原因,它没有按预期正确处理.如果您在Internet上搜索该类型,您将看到有关Connect上的问题的文档错误.

一个简单的解决方法是将数据放在一个不是KeyValuePair的简单对象中:

List<StringKeyValue> temp = new List<StringKeyValue>();
temp.Add(new StringKeyValue { Key = "key1", Value = "value1" } );
temp.Add(new StringKeyValue { Key = "key2", Value = "value2" });
temp.Add(new StringKeyValue { Key = "key3", Value = "value3" });
temp.Add(new StringKeyValue { Key = "key4", Value = "value4" });

this.DefaultViewModel["FooDictionary"] = temp;

public class StringKeyValue
{
    public string Key { get; set; }
    public string Value { get; set; }
}

顺便说一下,至少从简单的测试来看,根本不是导致问题的字典,而是它是一个KeyValuePair被转换为上述CLRIKeyValuePairImpl类型的对象实例.我尝试使用列表并向KeyValuePair<string, string>List 添加实例,但也失败了.