如何在Silverlight中將靜態字符串值添加到組合框？

Question

嗨，我有一個組合框控件在我的頁面組合框的數據是從視圖模型使用IEnumerable集合生成的。現在我想在組合框項目的最後添加一個靜態字符串。這個怎麼做？我重視我的組合框的截屏，擁有4個值，現在我想添加一個字符串例如

「自定義大小」在項目的底部。我也附加了我的視圖模型代碼。

PartsDomainContext context; 
    private IEnumerable<CategoryHierarchy> Categoryhierarchies; 
    private IEnumerable<CategoryHierarchy> _SizeCategoryhierarchies; 
    private CategoryHierarchy categoryhierarchy; 
    private CategoryHierarchy _Sizecategoryhierarchy; 
    private ProductCategory productcategory; 


    public IEnumerable<CategoryHierarchy> SizeCategoryHierarchies 
    { 
     get 
     { 
      return _SizeCategoryhierarchies; 
     } 
     set 
     { 
      _SizeCategoryhierarchies = value; 

     } 
    } 


    public CategoryHierarchy SizeCategoryHierarchy 
    { 

     get { return _Sizecategoryhierarchy; } 

     set 
     { 

      if (_Sizecategoryhierarchy == null) 
      { 

       _Sizecategoryhierarchy = value; 
       OnPropertyChanged("SizeCategoryHierarchy"); 

       ActiveData.Instance.size = _Sizecategoryhierarchy.Category.CategoryName.ToString(); 
       ActiveData.Instance.Description1 = _Sizecategoryhierarchy.Category.Description1; 
       ActiveData.Instance.Description2 = _Sizecategoryhierarchy.Category.Description2; 
       ActiveData.Instance.ShortDescription1 = _Sizecategoryhierarchy.Category.ShortDescription1; 
       ActiveData.Instance.Notes = _Sizecategoryhierarchy.Category.Notes; 

      } 
      else 
      { 
       try 
       { 
        _Sizecategoryhierarchy = value; 
        OnPropertyChanged("SizeCategoryHierarchy"); 

        ActiveData.Instance.size = _Sizecategoryhierarchy.Category.ToString(); 
       } 
       catch (Exception ex) 
       { 
       } 
       finally 
       { 
       } 
      } 




     } 


    } 



    public Wizard1ViewModel() 
    { 
     GetSize(); 
    } 


    public void GetSize(int parentcategory) 
    { 
     context = new PartsDomainContext(); 
     IsBusy = true; 
     context.Load(context.GetCategoryByHierarchyQuery(1), e => 
     { 
      if (!e.HasError) 
      { 

       SizeCategoryHierarchies = e.Entities.Where(c =>  c.ParentCategory.Equals(parentcategory)); 

       OnPropertyChanged("SizeCategoryHierarchies"); 

       IsBusy = false; 

      } 
     }, null); 
    } 


//Xaml 

 <Grid x:Name="LayoutRoot" Background="White"> 
      <Grid.RowDefinitions> 
       <RowDefinition Height="0*" /> 
       <RowDefinition Height="300*" /> 
      </Grid.RowDefinitions> 


        <ComboBox Name="poolsize" ItemsSource="{Binding SizeCategoryHierarchies, Mode=TwoWay}" DisplayMemberPath="Category.CategoryName" SelectedValuePath="Category.CategoryName" SelectedItem="{Binding SizeCategoryHierarchy, Mode=TwoWay}" HorizontalAlignment="Left" Margin="132,0,0,82" FontSize="16" VerticalAlignment="Bottom" Width="216" RenderTransformOrigin="0.505,2.967" DropDownOpened="poolsize_DropDownOpened_1"/> 




     </Grid> 

Answer 1

爲IEnumerable不提供添加方法，但您可以在INumerable使用的毗連，你可以找到在以下鏈接How can I add an item to a IEnumerable<T> collection?了詳細的解答。

Regards，