C# C Core 2.0-基于另一个模型中的数据从一个模型中获取数据?
我正在使用.NETCore2.0 我有两张桌子:C# C Core 2.0-基于另一个模型中的数据从一个模型中获取数据?,c#,entity-framework,linq,asp.net-core-2.0,.net-core-2.0,C#,Entity Framework,Linq,Asp.net Core 2.0,.net Core 2.0,我正在使用.NETCore2.0 我有两张桌子: Movies ID | Name | AuthorId ---------------------- 1 | AAAA | 1 2 | BBBB | 1 3 | CCCC | 1 4 | DDDD | 2 Reviews ID | FilmId | AuthorId | SomeText ------------------------------------ 1 | 1 | 1 | this is hor
Movies
ID | Name | AuthorId
----------------------
1 | AAAA | 1
2 | BBBB | 1
3 | CCCC | 1
4 | DDDD | 2
Reviews
ID | FilmId | AuthorId | SomeText
------------------------------------
1 | 1 | 1 | this is horror
2 | 1 | 2 | this is comendy
3 | 3 | 1 | it may be horror
4 | 3 | 2 | it is definitely comedy, not horror
我的模型是:
class Movie {
[Key]
public int ID { get; set; }
public string Name { get; set; }
public int AuthorId { get; set; }
public List<Review> Reviews { get; set; }
}
class Review {
[Key]
public int ID { get; set; }
public string SomeText { get; set; }
public int AuthorId { get; set; }
public int FilmId { get; set; }
public Movie Film { get; set; }
}
我的背景是:
public class MyContext : DbContext
{
public DbSet<Movie> Movie { get; set; }
public DbSet<Review> Review { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Movie>().HasMany(m => m.Reviews).WithOne(r => r.Film);
}
}
现在我想提出这样的疑问:
选择*FROM Movies m JOIN Reviews r ON m.ID==r.FilmId其中
m、 AuthorId=1且r.AuthorId=3或r.SomeText(如“%1%”)
预期结果应为CCCC
目前我有:
List<Movie> movies = _context.Movie.Include(m => m.Reviews.Select(r => r.AuthorId == 3 || r.SomeText.Contains("definitely"))).ToList();
如何用这个符号表示上述查询
然而,我确实得到:
InvalidOperationException:属性表达式'm=>{from Review
r在m中。审阅选择[r]。AuthorId==\u用户ID\u 0或LSE
[r] .SomeText.Contains有限}无效。表情
应表示属性访问:“r=>r.MyProperty”。更多
有关包含相关数据的信息,请参阅
我读过这篇文章,但它什么也没给我。我认为这个linq查询返回了正确的结果,因为我无法测试它
List<Movie> movies = _context.Movie.where(m => m.AuthorId == 1 && m.Reviews.Any(r =>
r.AuthorId == 3 || r.SomeText.Contains("definitely"))).ToList();
其中,不选择