Question

我有一个包含一些基准测试结果的类。这堂课或多或少看起来像这样：

public class TestResult
{
    public string TestName { get; set; }
    public int SampleSize { get; set; }
    public double Result { get; set; }
}

我已多次运行所有测试，因此每个样本大小都有很多结果，例如：

TestName: "MemoryTest", SampleSize: 1024, Result: 2.4741
TestName: "MemoryTest", SampleSize: 1024, Result: 2.5029
TestName: "MemoryTest", SampleSize: 1024, Result: 2.4902
TestName: "MemoryTest", SampleSize: 2048, Result: 4.5654
TestName: "MemoryTest", SampleSize: 2048, Result: 4.7156
TestName: "MemoryTest", SampleSize: 2048, Result: 4.2238
TestName: "MemoryTest", SampleSize: 4096, Result: 10.1863
TestName: "MemoryTest", SampleSize: 4096, Result: 9.9471
TestName: "MemoryTest", SampleSize: 4096, Result: 10.2240

TestName: "GraphicsTest", SampleSize: 1024, Result: 2.4741
TestName: "GraphicsTest", SampleSize: 1024, Result: 2.5029
TestName: "GraphicsTest", SampleSize: 1024, Result: 2.4902
TestName: "GraphicsTest", SampleSize: 2048, Result: 4.5654
TestName: "GraphicsTest", SampleSize: 2048, Result: 4.7156
TestName: "GraphicsTest", SampleSize: 2048, Result: 4.2238
TestName: "GraphicsTest", SampleSize: 4096, Result: 10.1863
TestName: "GraphicsTest", SampleSize: 4096, Result: 9.9471
TestName: "GraphicsTest", SampleSize: 4096, Result: 10.2240

现在我想创建一个List，其中包含所有结果的平均值，但是按TestName和SampleSize分组。

查看上面的示例，我想要一个包含6个结果的列表：3个用于GraphicsTest，3个用于MemoryTest，每个SampleSize的平均值。

我无法通过两个不同的列进行分组。我已经尝试了几种方法，但我无法掌握它......

到目前为止，我最好的方法是：

        var _Consolidation =
            from _R in Results
            group _R by new { _R.TestName, _R.SampleSize } into _G
            select new TestResult()
            {
                TestName = _G.Key.TestName,
                SampleSize = _G.Key.SampleSize,
                Result = from _Res 
                         in Results
                         where _Res.TestName == _G.Key.TestName && _Res.SampleSize == _G.Key.SampleSize
                         select _X => new
                         {
                             // ? Average Result? How to calculate it?
                         }
            };

但我不确定我是否走得正确。

Answer 1

您可以使用结果选择器malloc使用this overload：

GroupBy

在var result = tests.GroupBy(t => new { t.TestName, t.SampleSize }, (k, v) => new { SampleSize = k.SampleSize, TestName = k.TestName, Average = v.Average(t => t.Result) }); (k, v)中是您分组的密钥，k是每个组中的所有元素。

Answer 2

你很接近，你需要按照你所拥有的匿名类型进行分组，然后对分组进行平均只是对该组集合的平均值：

event.which

理解分组的关键是一个组本质上是一个键/值集合，其中键是您所分组的，而值是符合组选择器的所有项的集合;这个集合是你可以为每个小组工作的。

按两个值分组并计算第三个值

2 个答案: