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entity-framework-6 - IncludeFilter 多个级别不起作用

问题描述

此 IncludeFilter 存在问题并包含多个级别。我正在使用实体框架 6 Plus。

这是他们在标题下提供的示例https://entityframework-plus.net/query-include-filter 。Load multiple levels

这可行，但它返回的保修记录比我想要的要多。

db.Application.Where(x => x.ApplicationId == applicationId)
    .Include(x => x.Lienholder)
    .Include(x => x.Warranty.Select(y => y.Coverage.CoverageGroup))
    .Include(x => x.Vehicle)
    .Include(x => x.Vendor)
    .First();

这有效但.Coverage为空，但它是最接近示例的。

db.Application.Where(x => x.ApplicationId == applicationId)
    .Include(x => x.Lienholder)
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    )
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    ).Select(y => y.Coverage.CoverageGroup))
    .Include(x => x.Vehicle)
    .Include(x => x.Vendor)
    .First();

这根本不起作用，因为显然IncludeFilter你必须包含一个 where 子句

db.Application.Where(x => x.ApplicationId == applicationId)
    .Include(x => x.Lienholder)
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    ).Select(y => y.Coverage.CoverageGroup))
    .Include(x => x.Vehicle)
    .Include(x => x.Vendor)
    .First();

这一个有效，但它并不急于加载 Coverage

db.Application.Where(x => x.ApplicationId == applicationId)
    .Include(x => x.Lienholder)
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    )
    .Include(x => x.Vehicle)
    .Include(x => x.Vendor)
    .First();

标签： entity-framework-6entity-framework-plus

解决方案

  • 您不能Include与IncludeFilteror混合使用IncludeOptimized。
  • 您需要将每条路径包含在他自己的IncludeFilter

在您最接近的示例中，您错过了包含“Y.Coverage”

这些是目前图书馆的限制。

这是您要查找的内容：

db.Application.Where(x => x.ApplicationId == applicationId)
    .IncludeFilter(x => x.Lienholder)
    .IncludeFilter(x => x.Warranty.Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    ))
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    ).Select(y => y.Coverage))
    .IncludeFilter(x => x.Warranty.Where(z => true).Where(z =>
        z.WarrantyStatusId == 2 ||
        z.WarrantyStatusId == 3 ||
        z.WarrantyStatusId == 8 ||
        z.WarrantyStatusId == 10
    ).Select(y => y.Coverage.CoverageGroup)))
    .IncludeFilter(x => x.Vehicle)
    .IncludeFilter(x => x.Vendor)
    .First();

这根本不起作用，因为显然使用 IncludeFilter 您必须包含 where 子句

不，你没有。

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