新列表的 GroupBy bool 和 Select 值

GroupBy bool and Select values for new list

我正在尝试进入更复杂的 Linq 查询并立即抓住我感到卡住的要点。我在数据库中有以下列表:

ID            ELAPSED TIME           APPISRUNNING
1               12                        TRUE
2               54                        TRUE
3               32                        FALSE

其中 ELAPSED TIME 是 TimeSpan,APPISRUNNING 是布尔值。

我想根据这些值构建图表 (https://github.com/beto-rodriguez/LiveCharts2)。图表构建良好:

 Title = "Analytics";
  this.ActivityChartSeries = new ISeries[]
  {
    new PieSeries<double> { Values = new double[] { 2 }},
    new PieSeries<double> { Values = new double[] { 2 }},
    new PieSeries<double> { Values = new double[] { 2 }},
    new PieSeries<double> { Values = new double[] { 2 }},
    new PieSeries<double> { Values = new double[] { 2 }},
  };

现在我不知何故需要首先 GroupBy bool 然后 select 一个新列表?我试过以下:

  IEnumerable<DataRecord> dataRecords = await this.DataStore.GetItemsAsync();

  this.ActivityChartSeries = dataRecords
    .GroupBy(g => g.AppIsRunning)
    .Select(m => new
    { // BELOW IS TOTALLY UNCLEAR FOR ME
      Values = m.Select(r => r.EngineElapsed.Ticks),
      Name = m.Select(r => r.Name),
    })
    .Select(x =>
    new PieSeries<double>
    {
      Values = new List<double> { x.Values.FirstOrDefault() },
      Name = x.Name.FirstOrDefault(),
    });

分配变量的类型:

public IEnumerable<ISeries> ActivityChartSeries

这部分我完全不清楚:

      Values = m.Select(r => r.EngineElapsed.Ticks),
      Name = m.Select(r => r.Name),

GroupBy后如何创建两种类型的数据?基本上我需要

  1. “应用程序 运行”和“值”
  2. “应用程序不是 运行”和“值”

编辑:

Somar Zein 提供的代码可以正常编译:

var results = activityChartSeries
            .GroupBy(a=> a.AppIsRunning)
            .Select(item=> new PieSeries<double>{
                        Name = item.Key ? "Application is Running" : "Application is not Running",
                        Values = item.Select(x=> Convert.ToDouble(x.ElapsedTime.Ticks)).ToList()
        });

但是结果我得到了这样的东西,为什么它在循环中重新加载?

结果如下: enter image description here


EDIT2:

所以我创建了一个示例用于测试目的:

Class:

  public class DataModel
  {
    public int Id { get; set; }
    public TimeSpan ElapsedTime { get; set; }
    public bool AppIsRunning { get; set; }
  }

代码:

  List<DataModel> records = new List<DataModel>();

  records.Add(new DataModel { Id = 1, ElapsedTime = new TimeSpan(1, 20, 30), AppIsRunning = true });
  records.Add(new DataModel { Id = 2, ElapsedTime = new TimeSpan(1, 20, 30), AppIsRunning = true });
  records.Add(new DataModel { Id = 3, ElapsedTime = new TimeSpan(1, 20, 30), AppIsRunning = true });
  records.Add(new DataModel { Id = 4, ElapsedTime = new TimeSpan(1, 20, 30), AppIsRunning = true });
  records.Add(new DataModel { Id = 5, ElapsedTime = new TimeSpan(1, 20, 30), AppIsRunning = true });

  this.ActivityChartSeries = records
    .GroupBy(g => g.AppIsRunning)
    .Select(item => new PieSeries<double>
    {
      Name = item.Key ? "Running" : "Not Running",
      Values = new double[] { 2, 4 },
    });

我得到了相同的重新加载效果,即使你最初提供的来自 LiveCharts 的示例工作正常。

您可以尝试执行以下操作:

var results = activityChartSeries
            .GroupBy(a=> a.AppIsRunning)
            .Select(item=> new PieSeries<double>{
                        Name = item.Key ? "Application is Running" : "Application is not Running",
                        Values = item.Select(x=> Convert.ToDouble(x.ElapsedTime.Ticks)).ToList()
        });

希望对您有所帮助!