Question

我有以下型号：

public class HeadCount
{
    public int Id { get; set; }
    public int ContractId { get; set; }
    public string FiscalYear { get; set; }
    public string TaskOrder { get; set; }
    public decimal ContractHours { get; set; }
    public int PersonId { get; set; }
    public string CompanyName { get; set; }
    public string UserId { get; set; }
    public int ClinAssignId { get; set; }
}

使用标准sql，我在SSMS中运行以下脚本：

select personid, sum(contracthours) as hours from headcounts where personid != 0 group by personid

我正在试图将其转换为LINQ menthod调用。这就是我试过的：

var results = _context.HeadCounts
    .GroupBy(p => p.PersonId)
    .Select(n => new {personid = n.Key, hours = n.Sum(ContractHours)});

它不喜欢Sum中的ContractHours。我甚至试过n.ContractHours

我做错了什么？

Answer 1

如果集合不是原始数字集合，

<coordinator-app name="${jobName}" frequency="${coord:days(1)}" start="${startTime}" end="${endTime}" timezone="${timezone}" xmlns="uri:oozie:coordinator:0.2"> <controls> <timeout>-1</timeout> <concurrency>30</concurrency> <execution>FIFO</execution> </controls> <datasets> <dataset name="myData" frequency="${coord:days(1)}" initial-instance="${startTime}" timezone="UTC"> <uri-template>/time-independent/path/that/may/or/maynot/be/there</uri-template> </dataset> </datasets> <input-events> <data-in name="myInput" dataset="myData"> <instance>${startTime}</instance> </data-in> </input-events> <action> <workflow> <app-path>${myAppPath}</app-path> <configuration> <property> <name>myInput</name> <value>${coord:dataIn('myInput')}</value> </property> </configuration> </workflow> </action> </coordinator-app>会选择一个选择器，因此您需要：

Sum

Answer 2

感谢Robs对原始问题的评论，这是我正在寻找的答案。

c＃Linq方法使用GroupBy和Select

2 个答案: