我可以在 EF Core 中混合使用 LINQ 和 Fluent Syntax 吗？

Question

我有以下查询工作正常（因为它生成正确的 SQL 命令）：

var sites = from sm in this.context.SiteMemberships
    join s in this.context.Sites on sm.SiteUid equals s.SiteUid
    join sd in this.context.SiteData on s.SiteUid equals sd.SiteUid
    join p in this.context.Providers on s.ProviderUid equals p.ProviderUid
    join r in this.context.Regions on p.RegionUid equals r.RegionUid
    join o in this.context.Offices on s.OfficeUid equals o.OfficeUid
    join u in this.context.Users on sm.UserUid equals u.UserUid
    where 
        u.Email == userEmail ||
        EF.Functions.Like(s.Classification, "117400-74%")
    select new {
        s.Field1,
        sd.Field2,
        p.Field3
    };

如您所见，这是一个复杂的查询，尝试使用 Fluent API 非常很麻烦。但是，我希望 'Where' 子句是可编程的。根据当前用户拥有的特征，他们应该能够根据不同的标准进行搜索。 1 级支持人员只能搜索分类字段的完全匹配项，但 2 级支持人员可以搜索通配符。

有没有办法混合语法。我想要的是这样的：

var (sites = from sm in this.context.SiteMemberships
    join s in this.context.Sites on sm.SiteUid equals s.SiteUid
    join sd in this.context.SiteData on s.SiteUid equals sd.SiteUid
    join p in this.context.Providers on s.ProviderUid equals p.ProviderUid
    join r in this.context.Regions on p.RegionUid equals r.RegionUid
    join o in this.context.Offices on s.OfficeUid equals o.OfficeUid
    join u in this.context.Users on sm.UserUid equals u.UserUid)
    .Where(g => this.GetSearchCriteria(g)) 
    .Select(g => g);

Answer 1

您需要在最后一个 join

之后添加 select new { s, sd, p, r, o, u }

var sites = (from sm in this.context.SiteMemberships
    join s in this.context.Sites on sm.SiteUid equals s.SiteUid
    join sd in this.context.SiteData on s.SiteUid equals sd.SiteUid
    join p in this.context.Providers on s.ProviderUid equals p.ProviderUid
    join r in this.context.Regions on p.RegionUid equals r.RegionUid
    join o in this.context.Offices on s.OfficeUid equals o.OfficeUid
    join u in this.context.Users on sm.UserUid equals u.UserUid
    select new { s, sd, p, r, o, u })
    .Where(g => this.GetSearchCriteria(g)) 
    .Select(g => g);

我可以在 EF Core 中混合使用 LINQ 和 Fluent Syntax 吗？

Can I mix LINQ and Fluent Syntax in EF Core?

linq

entity-framework

linq-to-sql