Include / ThenInclude 与 EF Core 中的 where

Question

我需要在 ThenInclude 中使用 where

        var templatesFields = await _context.Sections
        .Include(x => x.Subtitles)
        .ThenInclude(r => r.Fields.Where(t=>t.TemplatesFields.TemplateID==TemplateID))
        .ThenInclude(r => r.OptionSources)
        .ThenInclude(r => r.OptionsSourcesDetails)
        .ToListAsync();

Answer 1

您不能在Include或 中使用 where 条件ThenInclude。你可以做的是：

var templatesFields = await _context.Sections
    .Include(x => x.Subtitles)
    .ThenInclude(r => r.Fields)
    .ThenInclude(r => r.OptionSources)
    .ThenInclude(r => r.OptionsSourcesDetails)
    .Where(t=>t.Subtitles.Fields.Any(x => x.TemplatesFields.TemplateID==TemplateID))
    .ToListAsync();

编辑：这可以通过 .Net Core 5.0（现在处于预览状态）

var blogs = context.Blogs
    .Include(e => e.Posts.Where(p => p.Title.Contains("Cheese")))
    .ToList();

过滤包含