为什么 DbContext 没有实现 IDbContext 接口? [英] Why DbContext doesn't implement IDbContext interface?

问题描述

为什么实体框架中没有 IDbContext 接口?如果有一个带有 SaveChanges() 等方法的现有接口，您可以从中派生出自定义数据库上下文接口，那么测试不是更容易吗?

Why there is no IDbContext interface in the Entity Framework? Wouldn't it be easier to test things if there was an existing interface with methods like SaveChanges() etc. from which you could derive your custom database context interface?

public interface ICustomDbContext : IDbContext
{
    // add entity set properties to existing set of methods in IDbContext
    IDbSet<SomeEntity> SomeEntities { get; }
}

推荐答案

我看到了这个IDbContext:

查看此链接 然后为实体上下文创建一个新的部分类那个界面.

See this link And then you make a new partial class for your Entities Context With That interface.

public partial class YourModelEntities : DbContext, IDbContext 

我编辑了这篇文章，这对我有用.我的背景

EDITED: I edited this post, This Works for me. My Context

namespace dao
{
    public interface ContextI : IDisposable
    {
        DbSet<TEntity> Set<TEntity>() where TEntity : class;
        DbSet Set(Type entityType);
        int SaveChanges();
        IEnumerable<DbEntityValidationResult> GetValidationErrors();
        DbEntityEntry<TEntity> Entry<TEntity>(TEntity entity) where TEntity:class;
        DbEntityEntry Entry(object entity);
        string ConnectionString { get; set; }
        bool AutoDetectChangedEnabled { get; set; }
        void ExecuteSqlCommand(string p, params object[] o);
        void ExecuteSqlCommand(string p);
    }
}

YourModelEntities 是您自动生成的分部类，您需要创建一个新的同名分部类，然后添加新的上下文接口，例如 ContextI

YourModelEntities is your auto-generated partial class, and your need to create a new partial class with the same name, then add your new context interface, for this example is ContextI

注意:该接口并未实现所有方法，因为这些方法是在您的自动生成代码中实现的.

NOTE: The interface hasn't implement all methods, because the methods are implemented in your auto-generate code.

namespace dao
{
    public partial class YourModelEntities :DbContext, ContextI
    {
        public string ConnectionString
        {
            get
            {
                return this.Database.Connection.ConnectionString;
            }
            set
            {
                this.Database.Connection.ConnectionString = value;
            }
        }

        bool AutoDetectChangedEnabled
        {
            get
            {
                return true;
            }
            set
            {
                throw new NotImplementedException();
            }
        }

        public void ExecuteSqlCommand(string p,params object[] os)
        {
            this.Database.ExecuteSqlCommand(p, os);
        }

        public void ExecuteSqlCommand(string p)
        {
            this.Database.ExecuteSqlCommand(p);
        }

        bool ContextI.AutoDetectChangedEnabled
        {
            get
            {
                return this.Configuration.AutoDetectChangesEnabled;
            }
            set
            {
                this.Configuration.AutoDetectChangesEnabled = value;
            }
        }
      
    }
}

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