Xaml 绑定到ComboBox时出现UWP异常

我得到一个例外：

AppName.exe中发生未经处理的win32异常

只有当我绑定到组合框时才会发生这种情况 这是我的XAML：

<ContentDialog x:Name="BrowseBySourceDialog"                                   
                                   Grid.Column="1"
                                   PrimaryButtonText="Accept" IsPrimaryButtonEnabled="False"          
                                   Opened="BrowseBySourceDialog_Opened">

                        <StackPanel  Background="White">
                                <Border Background="DarkGreen" MinHeight="40"
                                           MinWidth="300">
                                    <TextBlock Text="Browse: By Source"                     
                                                VerticalAlignment="Center"
                                                Foreground="White"        
                                                TextAlignment="Center"
                                                HorizontalAlignment="Center" />
                                </Border>
                            <StackPanel>

                                <ComboBox x:Name="BrowseBySourceComboBox" 
                                          PlaceholderText="Select Source"                      
                                          Height="40" 
                                          Width="300" 
                                          ItemsSource="{x:Bind BrowseBySourceList, Mode=OneWay}" 
                                          DisplayMemberPath="Source">
                                    <ComboBox.ItemTemplate>
                                        <DataTemplate x:DataType="local:FeaturedResponseItem">
                                            <TextBlock Text="{x:Bind key}"/>
                                        </DataTemplate>
                                    </ComboBox.ItemTemplate>

                                </ComboBox>
                            </StackPanel>
                        </StackPanel>
                    </ContentDialog>

---

您可以删除

displaymberpath=“Source”

，或者只需一起删除

ItemTemplate

，然后将

displaymberpath=“Source”

更改为

displaymberpath=“Key”
源代码的类型是什么？@JustinXL更新了我的问题
<ComboBox.ItemTemplate>
     <DataTemplate x:DataType="local:FeaturedResponseItem">
           <TextBlock Text="{x:Bind key}"/>
      </DataTemplate>
  </ComboBox.ItemTemplate>

ObservableCollection<FeaturedResponseItem> BrowseBySourceList { get; set; } = new ObservableCollection<FeaturedResponseItem>();

public class FeaturedResponseItem
    {
        public string key { get; set; }
        public string icon { get; set; }
        public bool accessible { get; set; }
    }