IOC+EF+Core项目搭建EF封装(一)

添加应用Microsoft.EntityFrameworkCore；Microsoft.EntityFrameworkCore.Design；Microsoft.EntityFrameworkCore.SqlServer

base类

public abstract partial class BaseEntity
    {
        /// <summary>
        /// id
        /// </summary>
        public Guid gid { get; set; }
    }

分装仓储结构接口

/// <summary>
    /// 仓储db接口
    /// </summary>
    public partial interface IDbContext
    {
        #region 方法
        /// <summary>
        /// 创建可用于查询和保存实体实例的DbSet
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <returns>A set for the given entity type</returns>
        DbSet<TEntity> Set<TEntity>() where TEntity : BaseEntity;

        /// <summary>
        /// 将在此上下文中所做的所有更改保存到数据库
        /// </summary>
        /// <returns>The number of state entries written to the database</returns>
        int SaveChanges();

        /// <summary>
        /// 生成一个脚本，为当前模型创建所有表
        /// </summary>
        /// <returns>A SQL script</returns>
        string GenerateCreateScript();

        /// <summary>
        /// 基于原始SQL查询为查询类型创建LINQ查询
        /// </summary>
        /// <typeparam name="TQuery">Query type</typeparam>
        /// <param name="sql">The raw SQL query</param>
        /// <returns>An IQueryable representing the raw SQL query</returns>
        IQueryable<TQuery> QueryFromSql<TQuery>(string sql) where TQuery : class;

        /// <summary>
        /// 基于原始SQL查询为实体创建LINQ查询
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <param name="sql">The raw SQL query</param>
        /// <param name="parameters">The values to be assigned to parameters</param>
        /// <returns>An IQueryable representing the raw SQL query</returns>
        IQueryable<TEntity> EntityFromSql<TEntity>(string sql, params object[] parameters) where TEntity : BaseEntity;

        /// <summary>
        /// 对数据库执行给定的SQL
        /// </summary>
        /// <param name="sql">The SQL to execute</param>
        /// <param name="doNotEnsureTransaction">true - the transaction creation is not ensured; false - the transaction creation is ensured.</param>
        /// <param name="timeout">The timeout to use for command. Note that the command timeout is distinct from the connection timeout, which is commonly set on the database connection string</param>
        /// <param name="parameters">Parameters to use with the SQL</param>
        /// <returns>The number of rows affected</returns>
        int ExecuteSqlCommand(RawSqlString sql, bool doNotEnsureTransaction = false, int? timeout = null, params object[] parameters);

        /// <summary>
        /// 从上下文中分离一个实体
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <param name="entity">Entity</param>
        void Detach<TEntity>(TEntity entity) where TEntity : BaseEntity;
        #endregion
    }

 /// <summary>
    /// 基础仓储接口
    /// </summary>
    public partial interface IRepository<TEntity> where TEntity : BaseEntity
    {
        #region 方法
        /// <summary>
        /// 查询对象
        /// </summary>
        TEntity GetById(object gid);

        /// <summary>
        /// 添加
        /// </summary>
        void Insert(TEntity entity);

        /// <summary>
        /// 批量添加
        /// </summary>
        void Insert(IEnumerable<TEntity> entities);

        /// <summary>
        /// 修改
        /// </summary>
        void Update(TEntity entity);

        /// <summary>
        /// 批量修改
        /// </summary>
        void Update(IEnumerable<TEntity> entities);

        /// <summary>
        /// 删除
        /// </summary>
        void Delete(TEntity entity);

        /// <summary>
        /// 批量删除
        /// </summary>
        void Delete(IEnumerable<TEntity> entities);
        #endregion

        #region 属性
        /// <summary>
        /// 查询数据集
        /// </summary>
        IQueryable<TEntity> Table { get; }

        /// <summary>
        /// 获取一个启用“no tracking”(EF特性)的表，仅当您仅为只读操作加载记录时才使用它
        /// </summary>
        IQueryable<TEntity> TableNoTracking { get; }
        #endregion
    }

/// <summary>
    /// 基础仓储实现
    /// </summary>
    public partial class EfRepository<TEntity> : IRepository<TEntity> where TEntity : BaseEntity
    {
        #region 参数
        private readonly IDbContext _context;
        private DbSet<TEntity> _entities;
        #endregion

        #region 构造函数
        public EfRepository(IDbContext context)
        {
            this._context = context;
        }
        #endregion

        #region 公共方法
        /// <summary>
        /// 实体更改的回滚并返回完整的错误消息
        /// </summary>
        /// <param name="exception">Exception</param>
        /// <returns>Error message</returns>
        protected string GetFullErrorTextAndRollbackEntityChanges(DbUpdateException exception)
        {
            //回滚实体
            if (_context is DbContext dbContext)
            {
                var entries = dbContext.ChangeTracker.Entries()
                    .Where(e => e.State == EntityState.Added || e.State == EntityState.Modified).ToList();

                entries.ForEach(entry => entry.State = EntityState.Unchanged);
            }
            _context.SaveChanges();
            return exception.ToString();
        }
        #endregion

        #region 方法
        /// <summary>
        /// 按id获取实体
        /// </summary>
        /// <param name="id">Identifier</param>
        /// <returns>Entity</returns>
        public virtual TEntity GetById(object id)
        {
            return Entities.Find(id);
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="entity">Entity</param>
        public virtual void Insert(TEntity entity)
        {
            if (entity == null)
                throw new ArgumentNullException(nameof(entity));

            try
            {
                Entities.Add(entity);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        /// <summary>
        /// 批量添加
        /// </summary>
        /// <param name="entities">Entities</param>
        public virtual void Insert(IEnumerable<TEntity> entities)
        {
            if (entities == null)
                throw new ArgumentNullException(nameof(entities));

            try
            {
                Entities.AddRange(entities);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        /// <summary>
        /// 修改
        /// </summary>
        /// <param name="entity">Entity</param>
        public virtual void Update(TEntity entity)
        {
            if (entity == null)
                throw new ArgumentNullException(nameof(entity));

            try
            {
                Entities.Update(entity);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        /// <summary>
        /// 批量修改
        /// </summary>
        /// <param name="entities">Entities</param>
        public virtual void Update(IEnumerable<TEntity> entities)
        {
            if (entities == null)
                throw new ArgumentNullException(nameof(entities));

            try
            {
                Entities.UpdateRange(entities);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="entity">Entity</param>
        public virtual void Delete(TEntity entity)
        {
            if (entity == null)
                throw new ArgumentNullException(nameof(entity));

            try
            {
                Entities.Remove(entity);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        /// <summary>
        /// 批量删除
        /// </summary>
        /// <param name="entities">Entities</param>
        public virtual void Delete(IEnumerable<TEntity> entities)
        {
            if (entities == null)
                throw new ArgumentNullException(nameof(entities));

            try
            {
                Entities.RemoveRange(entities);
                _context.SaveChanges();
            }
            catch (DbUpdateException exception)
            {
                //ensure that the detailed error text is saved in the Log
                throw new Exception(GetFullErrorTextAndRollbackEntityChanges(exception), exception);
            }
        }

        #endregion

        #region 属性
        /// <summary>
        /// 获取表
        /// </summary>
        public virtual IQueryable<TEntity> Table => Entities;

        /// <summary>
        /// 获取一个启用“no tracking”(EF特性)的表，仅当您仅为只读操作加载记录时才使用它
        /// </summary>
        public virtual IQueryable<TEntity> TableNoTracking => Entities.AsNoTracking();

        /// <summary>
        /// 获取设置模板
        /// </summary>
        protected virtual DbSet<TEntity> Entities
        {
            get
            {
                if (_entities == null)
                    _entities = _context.Set<TEntity>();

                return _entities;
            }
        }
        #endregion
    }

ef的模型映射封装

 /// <summary>
    /// 表示数据库上下文模型映射配置
    /// </summary>
    public partial interface IMappingConfiguration
    {
        /// <summary>
        /// 应用此映射配置
        /// </summary>
        /// <param name="modelBuilder">用于构造数据库上下文模型的生成器</param>
        void ApplyConfiguration(ModelBuilder modelBuilder);
    }

/// <summary>
    /// 表示基本实体映射配置
    /// </summary>
    /// <typeparam name="TEntity">Entity type</typeparam>
    public partial class NopEntityTypeConfiguration<TEntity> : IMappingConfiguration, IEntityTypeConfiguration<TEntity> where TEntity : BaseEntity
    {
        #region Utilities
        /// <summary>
        /// Developers can override this method in custom partial classes in order to add some custom configuration code
        /// </summary>
        /// <param name="builder">The builder to be used to configure the entity</param>
        protected virtual void PostConfigure(EntityTypeBuilder<TEntity> builder)
        {
        }
        #endregion

        #region Methods
        /// <summary>
        /// Configures the entity
        /// </summary>
        /// <param name="builder">The builder to be used to configure the entity</param>
        public virtual void Configure(EntityTypeBuilder<TEntity> builder)
        {
            //add custom configuration
            this.PostConfigure(builder);
        }

        /// <summary>
        /// Apply this mapping configuration
        /// </summary>
        /// <param name="modelBuilder">The builder being used to construct the model for the database context</param>
        public virtual void ApplyConfiguration(ModelBuilder modelBuilder)
        {
            modelBuilder.ApplyConfiguration(this);
        }
        #endregion
    }

/// <summary>
    /// 表示基本EF对象上下文
    /// </summary>
    public partial class NopObjectContext : DbContext, IDbContext
    {
        #region 构造函数
        public NopObjectContext(DbContextOptions<NopObjectContext> options) : base(options)
        {
        }
        #endregion

        #region 公共方法
        /// <summary>
        /// 进一步配置注册映射模型
        /// </summary>
        /// <param name="modelBuilder">用于为该上下文构造模型的构造器</param>
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            //动态加载所有实体和查询类型配置
            var typeConfigurations = Assembly.GetExecutingAssembly().GetTypes().Where(type =>
                (type.BaseType?.IsGenericType ?? false)
                    && (type.BaseType.GetGenericTypeDefinition() == typeof(NopEntityTypeConfiguration<>)));

            foreach (var typeConfiguration in typeConfigurations)
            {
                var configuration = (IMappingConfiguration)Activator.CreateInstance(typeConfiguration);
                configuration.ApplyConfiguration(modelBuilder);
            }

            base.OnModelCreating(modelBuilder);
        }

        /// <summary>
        /// 通过添加传递的参数来修改输入SQL查询
        /// </summary>
        /// <param name="sql">The raw SQL query</param>
        /// <param name="parameters">The values to be assigned to parameters</param>
        /// <returns>Modified raw SQL query</returns>
        protected virtual string CreateSqlWithParameters(string sql, params object[] parameters)
        {
            //add parameters to sql
            for (var i = 0; i <= (parameters?.Length ?? 0) - 1; i++)
            {
                if (!(parameters[i] is DbParameter parameter))
                    continue;

                sql = $"{sql}{(i > 0 ? "," : string.Empty)} @{parameter.ParameterName}";

                //whether parameter is output
                if (parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Output)
                    sql = $"{sql} output";
            }

            return sql;
        }
        #endregion

        #region 方法
        /// <summary>
        /// 创建可用于查询和保存实体实例的DbSet
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <returns>A set for the given entity type</returns>
        public virtual new DbSet<TEntity> Set<TEntity>() where TEntity : BaseEntity
        {
            return base.Set<TEntity>();
        }

        /// <summary>
        /// 生成一个脚本，为当前模型创建所有表
        /// </summary>
        /// <returns>A SQL script</returns>
        public virtual string GenerateCreateScript()
        {
            return this.Database.GenerateCreateScript();
        }

        /// <summary>
        /// 基于原始SQL查询为查询类型创建LINQ查询
        /// </summary>
        /// <typeparam name="TQuery">Query type</typeparam>
        /// <param name="sql">The raw SQL query</param>
        /// <returns>An IQueryable representing the raw SQL query</returns>
        public virtual IQueryable<TQuery> QueryFromSql<TQuery>(string sql) where TQuery : class
        {
            return this.Query<TQuery>().FromSql(sql);
        }

        /// <summary>
        ///基于原始SQL查询为实体创建LINQ查询
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <param name="sql">The raw SQL query</param>
        /// <param name="parameters">The values to be assigned to parameters</param>
        /// <returns>An IQueryable representing the raw SQL query</returns>
        public virtual IQueryable<TEntity> EntityFromSql<TEntity>(string sql, params object[] parameters) where TEntity : BaseEntity
        {
            return this.Set<TEntity>().FromSql(CreateSqlWithParameters(sql, parameters), parameters);
        }

        /// <summary>
        /// 对数据库执行给定的SQL
        /// </summary>
        /// <param name="sql">The SQL to execute</param>
        /// <param name="doNotEnsureTransaction">true - the transaction creation is not ensured; false - the transaction creation is ensured.</param>
        /// <param name="timeout">The timeout to use for command. Note that the command timeout is distinct from the connection timeout, which is commonly set on the database connection string</param>
        /// <param name="parameters">Parameters to use with the SQL</param>
        /// <returns>The number of rows affected</returns>
        public virtual int ExecuteSqlCommand(RawSqlString sql, bool doNotEnsureTransaction = false, int? timeout = null, params object[] parameters)
        {
            //set specific command timeout
            var previousTimeout = this.Database.GetCommandTimeout();
            this.Database.SetCommandTimeout(timeout);

            var result = 0;
            if (!doNotEnsureTransaction)
            {
                //use with transaction
                using (var transaction = this.Database.BeginTransaction())
                {
                    result = this.Database.ExecuteSqlCommand(sql, parameters);
                    transaction.Commit();
                }
            }
            else
                result = this.Database.ExecuteSqlCommand(sql, parameters);

            //return previous timeout back
            this.Database.SetCommandTimeout(previousTimeout);

            return result;
        }

        /// <summary>
        /// 从上下文中分离一个实体
        /// </summary>
        /// <typeparam name="TEntity">Entity type</typeparam>
        /// <param name="entity">Entity</param>
        public virtual void Detach<TEntity>(TEntity entity) where TEntity : BaseEntity
        {
            if (entity == null)
                throw new ArgumentNullException(nameof(entity));

            var entityEntry = this.Entry(entity);
            if (entityEntry == null)
                return;

            //set the entity is not being tracked by the context
            entityEntry.State = EntityState.Detached;
        }
        #endregion
    }

代码都是从nop开源项目出抠出来的