Question

我的大多数实体（并非全部）都有两个名为CompanyId和Deleted的属性。如何为所有选择请求自动插入这两个属性，而不是手动设置我在整个应用程序中的每个查询。

示例：

db.MyEntity.Where(me => me.Id == 1).Select(me => me.Description)

动态检查实体是否有道具CompanyId和Deleted。
肯定案例，将其转换为

db.MyEntity.Where(me => me.Id == 1 && Deleted == false && CompanyId == 1).Select(me => me.Description）

案例否定，保持相同的选择查询。

这将有助于我将这些条件设置为具有可用属性的所有查询。

Answer 1

您可以在nuget包的帮助下添加过滤器：EntityFramework.Filters。另外，好主意是创建公共接口而不是动态检查属性是否存在：

public interface IMyEntityInterface
{
    public int Id {get;set;}
    public bool Deleted {get;set;}
}

public class MyEntity : IMyEntityInterface
{
    public int Id {get;set;}
    public bool Deleted {get;set;}
    //other stuff
}

protected override void OnModelCreating(DbModelBuilder modelBuilder) 
{   
    modelBuilder.Conventions
       .Add(FilterConvention.Create<IMyEntityInterface, int, bool>("MyFilter", (entity, Id, Deleted) => entity.Id == Id && entity.Deleted == Deleted);
}

<强>用法：

var filter = db.EnableFilter("MyFilter");
filter.SetParameter("Id", 1);
filter.SetParameter("Deleted", false);

var data = db.MyEntity.Where(me => me.CompanyId == 1).Select(me => me.Description);
//select Description from MyEntities where Id = 1 and Deleted = false and CompanyId = 1

为所有请求添加Where条件EF6

1 个答案: