DBset上的EF Core no .Include（）方法 [英] EF Core no .Include() method on DBset

问题描述

我目前完全无法调用.include（），并且intellisense（在vscode中）似乎不认为它存在。

I'm currently completely unable to call .Include() and intellisense (in vscode) doesn't seem to think it exists.

现在已经很长时间了在网络上搜索，我发现了这一点：

Now after a long time searching the web I've found this:

在我的EF实现通用存储库的EF中找不到.include（）方法

这似乎表明。 Include仅存在于System.Data.Entities中，仅适用于EF 5和EF 6。

which seems to suggest that .Include exists only in System.Data.Entities, which is only available for EF 5 and 6.

因此，我如何急于为EF核心中的实体加载列表属性？

So how do i eager load my list property for an entity in EF core?

这是我的上下文

public class Database : DbContext
{
    //Set new datasources like this: public DbSet<class> name { get; set; }

    public DbSet<Domain.Resource> Resources { get; set; }
    public DbSet<Domain.ResourceType> ResourceTypes { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite("Filename=./something.db");
    }
}

此处有数据类：

public class Resource
{
    public int ResourceId { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }

    public int ResourceTypeId { get; set; }
    public ResourceType ResourceType { get; set; }
}
public class ResourceType
{
    public int ResourceTypeId { get; set; }
    public string Name { get; set; }

    public List<Resource> Resources { get; set; }
}

然后我做类似的事情：

public List<ResourceType> GetAll()
{
    var router = new Database();

    var result = router.ResourceTypes.Include(rt => rt.Resources); //It's here there's absolutely no .Include method

    return result.ToList();
}

是否包含EF Core中不存在？

Does .Include not exist in EF Core?

推荐答案

这是我在调用该方法的文件中缺少引用的直接结果（尽管我不确定我如何理解...）

It's a direct consequence of a missing reference in the file where I'm making a call to the method (though i'm not quite sure i understand how...)

无论如何，还要添加：

using Microsoft.EntityFrameworkCore;

像 Tseng 和 Smit 提出了建议。 （在我定义函数的文件中）

like Tseng and Smit suggested, did the trick. (in the file in which i define the function)

尽管为什么这样我不知道。我认为.include将通过DbSet自动提供。

Though why that works i have no idea. I thought .include would automatically be available through the DbSet.

谢谢！ ：）

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