LINQ 删除 group by 中具有特定值的项目

Question

我有代码，其中我按机会编号对我的要求进行分组，如下所示：

        List<Requirement> result = requirements
                                    .GroupBy(l => l.CRMOpportunityNumber)
                                    .Select(cl => new Requirement
                                    {
                                        CRMOpportunityNumber = cl.First().CRMOpportunityNumber,
                                        OpportunityTitle = cl.First().OpportunityTitle,
                                        ClientName = cl.First().ClientName,
                                        TentativeStartDate = cl.Min(c => c.TentativeStartDate),
                                        TotalPositions = cl.Sum(c => c.Required),
                                        RegionName = cl.First().RegionName,
                                        TotalCVProposed = cl.Sum(c => c.Associates.Count),
                                        TotalDeployed = cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true)),
                                        NetGap = cl.Sum(c => c.Required) - cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true)),
                                    }).OrderByDescending(l => l.CRMOpportunityNumber).ToList();

现在我不想在分组（结果）中包含所有 CATEGORY 字段值等于“工作开始”的要求。

需求类有一个字段类别。

Answer 1

在分组之前使用Where子句排除“工作已开始”类别

    List<Requirement> result = requirements
                                .Where(r => r.Category != "work commenced")
                                .GroupBy(l => l.CRMOpportunityNumber)
                                .Select(cl => new Requirement
                                {
                                    CRMOpportunityNumber = cl.First().CRMOpportunityNumber,
                                    OpportunityTitle = cl.First().OpportunityTitle,
                                    ClientName = cl.First().ClientName,
                                    TentativeStartDate = cl.Min(c => c.TentativeStartDate),
                                    TotalPositions = cl.Sum(c => c.Required),
                                    RegionName = cl.First().RegionName,
                                    TotalCVProposed = cl.Sum(c => c.Associates.Count),
                                    TotalDeployed = cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true)),
                                    NetGap = cl.Sum(c => c.Required) - cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true)),
                                }).OrderByDescending(l => l.CRMOpportunityNumber).ToList();

编辑

如果您想排除所有需求都属于“工作已开始”类别的组，可以：

List<Requirement> result = requirements
    .GroupBy(l => l.CRMOpportunityNumber)
    .Where(cl => cl.All(l => l.Category != "work commenced"))
    .Select(cl => new Requirement
    {
        CRMOpportunityNumber = cl.First().CRMOpportunityNumber,
        OpportunityTitle = cl.First().OpportunityTitle,
        ClientName = cl.First().ClientName,
        TentativeStartDate = cl.Min(c => c.TentativeStartDate),
        TotalPositions = cl.Sum(c => c.Required),
        RegionName = cl.First().RegionName,
        TotalCVProposed = cl.Sum(c => c.Associates.Count),
        TotalDeployed = cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true)),
        NetGap = cl.Sum(c => c.Required) - cl.Sum(c => c.Associates.Count(x => x.IsIdentified == true))
    }).OrderByDescending(l => l.CRMOpportunityNumber)
    .ToList();