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WPF ListBox.ItemsSource = ObservableCollection - 需要很长时间才能加载

我有这样的代码:(将自定义对象的集合加载到内存和列表框项目中)

public class Product : INotifyPropertyChanged
  {
    // these four doesn't matter, just Product's simple data
    public string nDB_No { get; set; }
    public string fdGrp_Cd { get; set; }
    public string long_Desc { get; set; }
    public int    refuse { get; set; }

    // I do not load this Collection right away, only after explicit call
    public ObservableCollection<Ingredient> ingredients { get; set; }

    public Product() {sets all null}
    public static ObservableCollection<Product> LoadProductsFromList(List<string> productList) {gets products data from SQLServer DB} …
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c# wpf listbox stopwatch datatemplate

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