c# - 与列表项的可见性绑定(bind)

Question

List<MyItem> Reports = new List<MyItem>();

public class MyItem
    {
        public int CountAnswers{ get; set; }
        public DateTime DateTimeStartTime { get; set; }
    }

我使用 Binding 在 ListBox 中显示它:

<ListBox Name="QuestionList" ItemsSource="{Binding Reports}">
    <ListBox.ItemTemplate>
        <DataTemplate >            
             <TextBlock Text="{Binding CountAnswers}"/>                      
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

我只想显示 CountAnswers 大于 0 的项目。我有 100 个项目，但只有少数项目有 CountAnswers > 0。

Answer 1

然后使用 LINQ ...

public IEnumerable<MyItem> ReportsWithAnwers
{
    get
    {
       return Reports.Where(x => x.CountAnswers > 0);
    }
}

<ListBox Name="QuestionList" ItemsSource="{Binding ReportsWithAnwers}">
    <ListBox.ItemTemplate>
        <DataTemplate >            
             <TextBlock Text="{Binding CountAnswers}"/>                      
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>