使用LINQ获取1-2-3分数并将其绑定到View

发布于 2024-11-30 19:17:41 字数 1542 浏览 1 评论 0原文

我有一个包含球员和得分的表（姓名：Mike 得分：10，姓名：Peter 得分：5 等）和一个包含 3 张铜牌、银牌和金牌图片的视图。在每张图片下方，我想显示每周/每轮获胜者的玩家姓名。很可能有多个铜牌、银牌或金牌。

在我的 TotalViewModel 中，我有一个用于所有总分数的 ObservableCollection：

public const string TotalsPropertyName = "Totals";

private ObservableCollection<TotalViewModel> _totals;

public ObservableCollection<TotalViewModel> Totals
{
    get
    {
        return _totals;
    }
    set
    {
        if (_totals == value)
            return;
        _totals = value;
        RaisePropertyChanged(TotalsPropertyName);
    }
}

我想使用 IEnumerable，因为有多个数字一、二、三分数：

public IEnumerable<TotalViewModel> FirstOne { get; private set; }

private void UpdateFirstOne()
{
    this.FirstOne = this.Totals.Where(elem => elem.Model.score > 0).OrderByDescending(e => e.Model.score);
}

private void Totals_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
    try
    {
        this.UpdateFirstOne();
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.ToString());
    }
}

我的视图的 DataContext 对于简单的绑定工作正常，它在 UserControl 中设置：

DataContext="{Binding MainTotal, Source={StaticResource Locator}}

但结果没有显示在我的 DataGrid 中（我猜我在这里犯了一个愚蠢的错误）：

<data:DataGrid ItemsSource="{Binding FirstOne, Mode=OneWay}" AutoGenerateColumns="true" Height="100" Name="dataGrid1" Width="120" />

所以我有 2 个问题：

如何获得所需的 1/2/3 分数集合？
如何让它们出现在我的视图中？

谢谢。

原文

I have a table with players and scores (Name:Mike Score:10, Name:Peter Score:5, etc) and a View with 3 pictures of a bronze, silver and gold medal.
Underneath each picture I want to display the playername(s) of the winners each week / round.
Could well be that there are multiple bronze, silver or gold scores.

In my TotalViewModel I have an ObservableCollection for all the Total Scores:

public const string TotalsPropertyName = "Totals";

private ObservableCollection<TotalViewModel> _totals;

public ObservableCollection<TotalViewModel> Totals
{
    get
    {
        return _totals;
    }
    set
    {
        if (_totals == value)
            return;
        _totals = value;
        RaisePropertyChanged(TotalsPropertyName);
    }
}

I wanted to use a IEnumerable because of the multiple numbers one, two, three score:

public IEnumerable<TotalViewModel> FirstOne { get; private set; }

private void UpdateFirstOne()
{
    this.FirstOne = this.Totals.Where(elem => elem.Model.score > 0).OrderByDescending(e => e.Model.score);
}

private void Totals_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
    try
    {
        this.UpdateFirstOne();
    }
    catch (Exception ex)
    {
        Debug.WriteLine(ex.ToString());
    }
}

The DataContext of my View is working fine for the straightforward bindings, it's set in the UserControl:

DataContext="{Binding MainTotal, Source={StaticResource Locator}}

But the results aren't displayed in my DataGrid (guess I'm making a stupid mistake here):

<data:DataGrid ItemsSource="{Binding FirstOne, Mode=OneWay}" AutoGenerateColumns="true" Height="100" Name="dataGrid1" Width="120" />

So I have 2 questions:

How do I get the desired collection of number 1/2/3 scores?
How do I get them in my View?

Thanks.

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寄与心 2024-12-07 19:17:41

好吧，我不会进入数据绑定位，但提取前三个的 linq 查询可能是这样的：

var topThreeScoringNameLists =
    Totals
        .GroupBy(x => x.Model.Score)
        .OrderByDescending(x => x.Key)
        .Take(3)
        .Select(x => 
            String.Join(", ", x.Select(y => y.Model.Name).ToArray()));

Well I wont get into the data binding bit but a linq query to extract the top three could be something like this:

var topThreeScoringNameLists =
    Totals
        .GroupBy(x => x.Model.Score)
        .OrderByDescending(x => x.Key)
        .Take(3)
        .Select(x => 
            String.Join(", ", x.Select(y => y.Model.Name).ToArray()));

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温柔一刀 2024-12-07 19:17:41

您正在绑定到 FirstOne，因此您需要对该属性进行属性更改。

public IEnumerable<TotalViewModel> FirstOne 
{ 
    get
    {
        return _firstOne;
    }
    private set
    {
        _firstOne = value;
        RaisePropertyChanged("FirstOne");
    }
}

You're binding to FirstOne so you need to do a propertychanged for that property.

public IEnumerable<TotalViewModel> FirstOne 
{ 
    get
    {
        return _firstOne;
    }
    private set
    {
        _firstOne = value;
        RaisePropertyChanged("FirstOne");
    }
}

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