可观察的继承 collection

Question

我需要继承我的 Collection 作为 Class 如下：

public class UsageCollection
        : ObservableCollection<UsageStatistics>
{
    public UsageCollection()
    {
       // static initialization
        Add(new UsageStatistics("A", 6, "1/2/2012"));
        Add(new UsageStatistics("C", 8, "1/2/2012"));
    }  
}

public class UsageStatistics
{
    public string Alias { get; set; }
    public int ActivityCount { get; set; }
    public string Date { get; set; }

    public UsageStatistics(
        string alias,
        int activityCount,
        string date
        )
    {
        Alias = alias;
        ActivityCount = activityCount;
        Date = date;
    }
}

如您所见，我可以在构造函数中对其进行静态初始化。

然而，我实际上是在运行时获取这个 collection。如何将 collection 分配给此 class？

即时获取的 collection 是 ObservableCollection<UsageStatisctics>。

我需要封装的原因是因为基础设施需要这个：

 <Window.Resources>
        <comboSourceCase:UsageCollection x:Key="data" />
        <ig:GroupBy   
            x:Key="grouped"  
            ItemsSource="{StaticResource data}"   
            GroupMemberPath="Date"   
            KeyMemberPath="Alias"   
            ValueMemberPath="ActivityCount" />
    </Window.Resources>

    <Grid Margin="0,0,2,-2">
        <ig:XamDataChart x:Name="theChart" Height="200">
            <ig:XamDataChart.Axes>
                <ig:CategoryXAxis x:Name="xAxis"   
                                       ItemsSource="{StaticResource grouped}"  
                                       Label="{}{Key}"/>
                <ig:NumericYAxis x:Name="yAxis" />
            </ig:XamDataChart.Axes>

            <ig:XamDataChart.Series>
                <ig:StackedColumnSeries x:Name="stack"  
                                             ItemsSource="{StaticResource grouped}"  
                                             XAxis="{Binding ElementName=xAxis}"  
                                             YAxis="{Binding ElementName=yAxis}"  
                                             AutoGenerateSeries="True"  
                                             >

                </ig:StackedColumnSeries>
            </ig:XamDataChart.Series>
        </ig:XamDataChart>

请建议我如何将 collection 添加到 UsageCollection class，或者如何使用它的替代方法。

Answer 1

UsageCollection没有封装ObservableCollection<UsageStatistics>，是继承。封装...

public class UsageCollection {
    protected ObservableCollection<UsageStatistics> theCollection;
}

现在它被包含了，我们可以通过构造函数注入一个集合对象。

public UsageCollection ( ObservableCollection<UsageStatistics> someCollection );

Answer 2

How can I assign that collection to this class?

要访问存储在 XAML 资源中的集合，请使用 FindResource()

var data = (UsageCollection)this.FindResource("data");

data.Clear();
data.Add(new UsageStatistics("A", 6, "1/2/2012"));
data.Add(new UsageStatistics("C", 8, "1/2/2012"));

顺便说一句：您可以将样本数据嵌入 XAML:

而不是使用构造函数

<Window.Resources>
    <comboSourceCase:UsageCollection x:Key="data" >
        <comboSourceCase:UsageStatistics Alias="A" ActivityCount="3" Date= "1/2/2012"></comboSourceCase:UsageStatistics
        <comboSourceCase:UsageStatistics Alias="C" ActivityCount="8" Date= "1/2/2012"></comboSourceCase:UsageStatistics
    </comboSourceCase:UsageCollection>

Answer 3

以下示例演示了如何将您的集合与数据网格结合使用。如果它能解决您的问题，请告诉我。

public partial class Win32533638 : Window
{
    public Win32533638()
    {
        InitializeComponent();

        DgrdUsageStatistics.ItemsSource = _getUsageStatisticsFromServer();
    }

    private UsageCollection _getUsageStatisticsFromServer()
    {
        UsageCollection items = new UsageCollection();
        items.Add(new UsageStatistics("D", 8, "1/2/2015"));
        items.Add(new UsageStatistics("A", 6, "1/2/2012"));

        return items;
    }
}

您的数据模板：

<Window.Resources>
        <DataTemplate x:Key="DataTemplate1">
            <Grid d:DesignWidth="295.187" d:DesignHeight="128.271" Height="76" Width="300">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="52*"/>
                    <ColumnDefinition Width="57*"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="44*"/>
                    <RowDefinition Height="45*"/>
                    <RowDefinition Height="52*"/>
                </Grid.RowDefinitions>
                <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Text="Alias" VerticalAlignment="Top" Width="119" Margin="5,5,0,5"/>
                <TextBlock HorizontalAlignment="Left" Grid.Row="1" TextWrapping="Wrap" Text="Date" VerticalAlignment="Top" Width="119" Margin="5,5,0,5"/>
                <TextBlock HorizontalAlignment="Left" Grid.Row="2" TextWrapping="Wrap" Text="Activity Count" VerticalAlignment="Top" Width="119" Margin="5,5,0,5"/>
                <TextBlock Grid.Column="1" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding Alias}" VerticalAlignment="Top" Margin="5,5,0,5"/>
                <TextBlock Grid.Column="1" HorizontalAlignment="Left" Grid.Row="1" TextWrapping="Wrap" Text="{Binding Date}" VerticalAlignment="Top" Margin="5,5,0,5"/>
                <TextBlock Grid.Column="1" HorizontalAlignment="Left" Grid.Row="2" TextWrapping="Wrap" Text="{Binding ActivityCount}" VerticalAlignment="Top" Margin="5,5,0,5"/>
            </Grid>
        </DataTemplate>
    </Window.Resources>

您的 XAML 代码：

<DataGrid x:Name="DrgUsageWithTemplate" Margin="0 10 0 0" ItemsSource="{StaticResource UsgCollection}" AutoGenerateColumns="False" ItemTemplate="{DynamicResource DataTemplate1}">
            <DataGrid.Columns>
                <DataGridTemplateColumn Header="Usage Statistical Data" CellTemplate="{StaticResource ResourceKey=DataTemplate1}">

                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>

可观察的继承 collection

inheritance of observable collection

c#

wpf

infragistics