整理的有用的一些EF的CommonDAL小封装

CommonDAL封装：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Linq.Expressions;
using System.Text;

using YX.Model;

namespace YX.BLL
{

    /// <summary>
    /// 基础 dal 类 T 对应数据泛型
    /// </summary>
    public class CommonDAL<T> : IDisposable where T : class
    {
        /// <summary>
        /// 当前上下文
        /// </summary>
        DbContext DB;

        #region 构造函数
        public CommonDAL()
        {
            //默认db为mclentities
            this.DB = DBHelper.CreateDB(ConnectionStr.ServiceEntities);
        }

        public CommonDAL(string connName)
        {
            this.DB = DBHelper.CreateDB(connName);
        }

        public CommonDAL(DbContext db)
        {
            if (db == null)
            {
                throw new ArgumentNullException("db");
            }
            this.DB = db;
        }

        #endregion

        /// <summary>
        /// 当前db
        /// </summary>
        public DbContext CurrDB
        {
            get
            {
                return this.DB;
            }
            set
            {
                this.DB = value;
            }
        }

        /// <summary>
        /// 添加
        /// </summary>
        /// <param name="t">数据对象</param>
        /// <returns>成功否</returns>
        public bool Add(T t)
        {
            try
            {
                t = DB.Set<T>().Add(t);
                return DB.SaveChanges() > 0;
            }
            catch (Exception ex)
            {
                //添加错误日志
                Log.Logger.AddLog(ex.Message, ex);
                throw new Exception(ex.Message, ex);
            }
        }

        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="t">数据对象</param>
        /// <returns>成功否</returns>
        public bool Update(T t)
        {
            try
            {
                this.DB.Entry<T>(t).State = EntityState.Modified;
                return this.DB.SaveChanges() > 0;
            }
            catch (Exception ex)
            {
                //添加错误日志
                Log.Logger.AddLog(ex.Message, ex);
                throw new Exception(ex.Message, ex);
            }
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="t">数据对象</param>
        /// <returns>成功否</returns>
        public bool Delete(T t)
        {
            try
            {
                t = DB.Set<T>().Remove(t);
                return DB.SaveChanges() > 0;
            }
            catch (Exception ex)
            {
                //添加错误日志
                Log.Logger.AddLog(ex.Message, ex);
                throw new Exception(ex.Message, ex);
            }
        }

        /// <summary>
        /// 返回query
        /// </summary>
        /// <returns>查询接口</returns>
        public IQueryable<T> GetQuery()
        {
            var query = DB.Set<T>();
            return query;
        }

        /// <summary>
        /// 根据主键查询
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        //public abstract T Get(Key id);

        /// <summary>
        /// 返回所有值
        /// </summary>
        /// <returns></returns>
        public List<T> GetAll()
        {
            var dbQuery = this.GetQuery();
            return dbQuery.ToList();
        }

        /// <summary>
        /// 释放
        /// </summary>
        public void Dispose()
        {
            this.CurrDB.Dispose();
        }
    }
}

DBHelper：

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;

namespace YX.BLL
{
    /// <summary>
    /// 数据上下文创建类
    /// </summary>
    public class DBHelper
    {
        /// <summary>
        /// 创建上下文db方法
        /// </summary>
        /// <param name="connName"></param>
        /// <returns></returns>
        public static DbContext CreateDB(string connName)
        {
            return new DbContext(connName);
        }
    }
}

接下来就是在BaseBLL中去调用DAL:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;using YX.Entitys;
using YX.Model.SZR;
using YX.Log; using System.Reflection;

namespace YX.BLL.ShenZhouRong
{
    public class SZRBaseBLL : BaseBLL
    {
        /// <summary>
        /// 数据操作类
        /// </summary>
        public CommonDAL<TB_SZR_InterfaceLog> dal;

        private string _AppID = null;
        /// <summary>
        /// 当前APPID 
        /// </summary>
        public string CurrentAppID
        {
            get
            {
                return this._AppID;
            }
            set
            {
                this._AppID = value;
            }
        }
/// <summary>
        /// 构造函数
        /// </summary>
        public SZRBaseBLL()
        {
            dal = new CommonDAL<TB_SZR_InterfaceLog>();
        }

        /// <summary>
        /// 按 ID 获取
        /// </summary>
        /// <param name="id">id</param>
        /// <returns>数据对象</returns>
        public TB_SZR_InterfaceLog GetSingle(int id)
        {
            return dal.GetQuery().Where(s => s.Id == id).FirstOrDefault();
        }
 
        public void Add()
        {

Model_11 tss = new Model_11
{
CreateDate = DateTime.Now,
ERROR_CODE = ERROR_CODE,
IDNO = IDNO,
NAME = NAME,
RESULT = RESULT
};
CommonDAL<Model_11> dal = new CommonDAL<Model_11>();
return dal.Add(tss);

        }
    }
}