计算单个linq语句中的平均值

Question

我正在尝试编写一个linq语句，它将执行以下操作。我需要在一个linq语句中计算平均值。什么是最好的方法呢

var onlyLayer0 = trigger2Output.NpvResults.CommIns.Where(x => x.layerId == 0);
var numberOfRecords = onlyLayer0.Count();
var totalPremiumPaid = onlyLayer0.Sum(x => x.premPaid);
var avgpremiumPaid = totalPremiumPaid / numberOfRecords;

我目前的linq声明

trigger2Output.NpvResults.CommIns.Where(x => x.layerId == 0)
                            .Sum(x => x.premPaid)

Answer 1

尝试平均延期：

trigger2Output.NpvResults.CommIns.Where(x => x.layerId == 0).Average(x => x.premPaid)

这里是MSDN文档。

Answer 2

试试这个：

trigger2Output.NpvResults.CommIns.Where(x => x.layerId == 0).Average(r => r.premPaid);