23、ASP.NET MVC入门到精通——业务层和数据层父类及接口-T4模板

本系列目录： ASP.NET MVC4入门到精通系列目录汇总

在上一篇中，我们已经把项目的基本框架搭起来了，这一篇我们就来实现业务层和数据层的父接口及父类。

1 、我们先来定义一个业务层父接口 IBaseBLL.cs

  using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Threading.Tasks;  namespace IBLL {     /// <summary>     /// 业务父 接口     /// </summary>     /// <typeparam name="T"></typeparam>     public interface IBaseBLL<T> where T:class,new()     {         //定义 增删改查 方法         #region 1.0 新增 实体 +int Add(T model)         /// <summary>         /// 新增 实体         /// </summary>         /// <param name="model"></param>         /// <returns></returns>         int Add(T model);         #endregion          #region 2.0 根据 id 删除 +int Del(T model)         /// <summary>         /// 根据 id 删除         /// </summary>         /// <param name="model">包含要删除id的对象</param>         /// <returns></returns>         int Del(T model);         #endregion          #region 3.0 根据条件删除 +int DelBy(Expression<Func<T, bool>> delWhere)         /// <summary>         /// 3.0 根据条件删除         /// </summary>         /// <param name="delWhere"></param>         /// <returns></returns>         int DelBy(Expression<Func<T, bool>> delWhere);         #endregion          #region 4.0 修改 +int Modify(T model, params string[] proNames)         /// <summary>         /// 4.0 修改，如：         /// T u = new T() { uId = 1, uLoginName = "asdfasdf" };         /// this.Modify(u, "uLoginName");         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         int Modify(T model, params string[] proNames);         #endregion          #region 4.0 批量修改 +int Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         /// <summary>         /// 4.0 批量修改         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="whereLambda">查询条件</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         int ModifyBy(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames);         #endregion          #region 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// <summary>         /// 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// </summary>         /// <param name="whereLambda"></param>         /// <returns></returns>         List<T> GetListBy(Expression<Func<T, bool>> whereLambda);         #endregion          #region 5.1 根据条件 排序 和查询 + List<T> GetListBy<TKey>         /// <summary>         /// 5.1 根据条件 排序 和查询         /// </summary>         /// <typeparam name="TKey">排序字段类型</typeparam>         /// <param name="whereLambda">查询条件 lambda表达式</param>         /// <param name="orderLambda">排序条件 lambda表达式</param>         /// <returns></returns>         List<T> GetListBy<TKey>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderLambda);         #endregion          #region 6.0 分页查询 + List<T> GetPagedList<TKey>         /// <summary>         /// 6.0 分页查询 + List<T> GetPagedList<TKey>         /// </summary>         /// <param name="pageIndex">页码</param>         /// <param name="pageSize">页容量</param>         /// <param name="whereLambda">条件 lambda表达式</param>         /// <param name="orderBy">排序 lambda表达式</param>         /// <returns></returns>         List<T> GetPagedList<TKey>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderBy);         #endregion     } }  View Code

2 、定义一个数据层父接口 IBaseDAL.cs

  using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Threading.Tasks;  namespace IDAL {     /// <summary>     /// 数据层父接口     /// </summary>    public interface IBaseDAL<T> where T:class ,new()     {         //定义增删改查方法         #region 1.0 新增 实体 +int Add(T model)         /// <summary>         /// 新增 实体         /// </summary>         /// <param name="model"></param>         /// <returns></returns>         int Add(T model);         #endregion          #region 2.0 根据 id 删除 +int Del(T model)         /// <summary>         /// 根据 id 删除         /// </summary>         /// <param name="model">包含要删除id的对象</param>         /// <returns></returns>         int Del(T model);         #endregion          #region 3.0 根据条件删除 +int DelBy(Expression<Func<T, bool>> delWhere)         /// <summary>         /// 3.0 根据条件删除         /// </summary>         /// <param name="delWhere"></param>         /// <returns></returns>         int DelBy(Expression<Func<T, bool>> delWhere);         #endregion          #region 4.0 修改 +int Modify(T model, params string[] proNames)         /// <summary>         /// 4.0 修改，如：         /// T u = new T() { uId = 1, uLoginName = "asdfasdf" };         /// this.Modify(u, "uLoginName");         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         int Modify(T model, params string[] proNames);         #endregion          #region 4.0 批量修改 +int Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         /// <summary>         /// 4.0 批量修改         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="whereLambda">查询条件</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         int ModifyBy(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames);         #endregion          #region 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// <summary>         /// 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// </summary>         /// <param name="whereLambda"></param>         /// <returns></returns>         List<T> GetListBy(Expression<Func<T, bool>> whereLambda);         #endregion          #region 5.1 根据条件 排序 和查询 + List<T> GetListBy<TKey>         /// <summary>         /// 5.1 根据条件 排序 和查询         /// </summary>         /// <typeparam name="TKey">排序字段类型</typeparam>         /// <param name="whereLambda">查询条件 lambda表达式</param>         /// <param name="orderLambda">排序条件 lambda表达式</param>         /// <returns></returns>         List<T> GetListBy<TKey>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderLambda);         #endregion          #region 6.0 分页查询 + List<T> GetPagedList<TKey>         /// <summary>         /// 6.0 分页查询 + List<T> GetPagedList<TKey>         /// </summary>         /// <param name="pageIndex">页码</param>         /// <param name="pageSize">页容量</param>         /// <param name="whereLambda">条件 lambda表达式</param>         /// <param name="orderBy">排序 lambda表达式</param>         /// <returns></returns>         List<T> GetPagedList<TKey>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderBy);         #endregion     } }  View Code

3、我们数据库中有许多的表，通常每一张表都对应一个业务实体，如果我们每一个业务实体类都自己去手写的话，太浪费时间了，我们可以使用T4模板，简化这些枯燥的操作，提高我们的开发效率。

新建一个文本模板

然后把以下代码复制上去，

  <#@ template language="C#" debug="false" hostspecific="true"#> <#@ include file="EF.Utility.CS.ttinclude"#><#@ output extension=".cs"#>  <# CodeGenerationTools code = new CodeGenerationTools(this); MetadataLoader loader = new MetadataLoader(this); CodeRegion region = new CodeRegion(this, 1); MetadataTools ef = new MetadataTools(this); string inputFile = @"../MODEL/OA.edmx"; EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile); string namespaceName = code.VsNamespaceSuggestion(); EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this); #> using System; using System.Collections.Generic; using System.Linq; using System.Text;  namespace IBLL { <#  // Emit Entity Types foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)) {     //fileManager.StartNewFile(entity.Name + "RepositoryExt.cs");     //BeginNamespace(namespaceName, code);      #>     public partial interface I<#=entity.Name#>BLL : IBaseBLL<Model.<#=entity.Name#>>     {     }  <#}#>  }  View Code

按Ctrl+S 自动生成代码 ，自动生成的IBLL.cs如下：

    using System; using System.Collections.Generic; using System.Linq; using System.Text;  namespace IBLL {     public partial interface IBill_LeaveBLL : IBaseBLL<Model.Bill_Leave>     {     }      public partial interface IoldWF_AutoTransactNodeBLL : IBaseBLL<Model.oldWF_AutoTransactNode>     {     }      public partial interface IoldWF_BillFlowNodeBLL : IBaseBLL<Model.oldWF_BillFlowNode>     {     }      public partial interface IoldWF_BillFlowNodeRemarkBLL : IBaseBLL<Model.oldWF_BillFlowNodeRemark>     {     }      public partial interface IoldWF_BillStateBLL : IBaseBLL<Model.oldWF_BillState>     {     }      public partial interface IoldWF_NodeBLL : IBaseBLL<Model.oldWF_Node>     {     }      public partial interface IoldWF_NodeStateBLL : IBaseBLL<Model.oldWF_NodeState>     {     }      public partial interface IoldWF_WorkFlowBLL : IBaseBLL<Model.oldWF_WorkFlow>     {     }      public partial interface IoldWF_WorkFlowNodeBLL : IBaseBLL<Model.oldWF_WorkFlowNode>     {     }      public partial interface IOu_DepartmentBLL : IBaseBLL<Model.Ou_Department>     {     }      public partial interface IOu_PermissionBLL : IBaseBLL<Model.Ou_Permission>     {     }      public partial interface IOu_RoleBLL : IBaseBLL<Model.Ou_Role>     {     }      public partial interface IOu_RolePermissionBLL : IBaseBLL<Model.Ou_RolePermission>     {     }      public partial interface IOu_UserInfoBLL : IBaseBLL<Model.Ou_UserInfo>     {     }      public partial interface IOu_UserRoleBLL : IBaseBLL<Model.Ou_UserRole>     {     }      public partial interface IOu_UserVipPermissionBLL : IBaseBLL<Model.Ou_UserVipPermission>     {     }      public partial interface IW_WorkFlowBLL : IBaseBLL<Model.W_WorkFlow>     {     }      public partial interface IW_WorkFlowBranchBLL : IBaseBLL<Model.W_WorkFlowBranch>     {     }      public partial interface IW_WorkFlowNodeBLL : IBaseBLL<Model.W_WorkFlowNode>     {     }      public partial interface IW_WrokFlowRoleBLL : IBaseBLL<Model.W_WrokFlowRole>     {     }      public partial interface IWR_WorkFlowApplyBLL : IBaseBLL<Model.WR_WorkFlowApply>     {     }      public partial interface IWR_WrokFlowApplyDetailsBLL : IBaseBLL<Model.WR_WrokFlowApplyDetails>     {     }   }  View Code

4、把IBLL.tt拷贝到IDAL项目下，然后修改命名空间为IDAL，修改接口声明模板

 namespace IDAL public partial interface I<#=entity.Name#>DAL : IBaseDAL<Model.<#=entity.Name#>> 

按Ctrl+S 自动生成代码，自动生成的IDAL.cs如下：

    using System; using System.Collections.Generic; using System.Linq; using System.Text;  namespace IDAL {     public partial interface IBill_LeaveDAL : IBaseDAL<Model.Bill_Leave>     {     }      public partial interface IoldWF_AutoTransactNodeDAL : IBaseDAL<Model.oldWF_AutoTransactNode>     {     }      public partial interface IoldWF_BillFlowNodeDAL : IBaseDAL<Model.oldWF_BillFlowNode>     {     }      public partial interface IoldWF_BillFlowNodeRemarkDAL : IBaseDAL<Model.oldWF_BillFlowNodeRemark>     {     }      public partial interface IoldWF_BillStateDAL : IBaseDAL<Model.oldWF_BillState>     {     }      public partial interface IoldWF_NodeDAL : IBaseDAL<Model.oldWF_Node>     {     }      public partial interface IoldWF_NodeStateDAL : IBaseDAL<Model.oldWF_NodeState>     {     }      public partial interface IoldWF_WorkFlowDAL : IBaseDAL<Model.oldWF_WorkFlow>     {     }      public partial interface IoldWF_WorkFlowNodeDAL : IBaseDAL<Model.oldWF_WorkFlowNode>     {     }      public partial interface IOu_DepartmentDAL : IBaseDAL<Model.Ou_Department>     {     }      public partial interface IOu_PermissionDAL : IBaseDAL<Model.Ou_Permission>     {     }      public partial interface IOu_RoleDAL : IBaseDAL<Model.Ou_Role>     {     }      public partial interface IOu_RolePermissionDAL : IBaseDAL<Model.Ou_RolePermission>     {     }      public partial interface IOu_UserInfoDAL : IBaseDAL<Model.Ou_UserInfo>     {     }      public partial interface IOu_UserRoleDAL : IBaseDAL<Model.Ou_UserRole>     {     }      public partial interface IOu_UserVipPermissionDAL : IBaseDAL<Model.Ou_UserVipPermission>     {     }      public partial interface IW_WorkFlowDAL : IBaseDAL<Model.W_WorkFlow>     {     }      public partial interface IW_WorkFlowBranchDAL : IBaseDAL<Model.W_WorkFlowBranch>     {     }      public partial interface IW_WorkFlowNodeDAL : IBaseDAL<Model.W_WorkFlowNode>     {     }      public partial interface IW_WrokFlowRoleDAL : IBaseDAL<Model.W_WrokFlowRole>     {     }      public partial interface IWR_WorkFlowApplyDAL : IBaseDAL<Model.WR_WorkFlowApply>     {     }      public partial interface IWR_WrokFlowApplyDetailsDAL : IBaseDAL<Model.WR_WrokFlowApplyDetails>     {     }   }  View Code

注意，我这里生成的所有接口都是 partial 类型的，这样我以后可以很方便的进行扩展

关于T4模板的使用不在本篇所讲的范畴，有兴趣的朋友，可以查找相关资料学习，我这里只做简要说明。

<#@ include file="EF.Utility.CS.ttinclude"#>：引入微软的生成框架

<#@ output extension=".cs"#>：指定生成的文件类型为.cs文件

string inputFile = @"../MODEL/OA.edmx"：这里使用相对路径指向我们新建的ADO.NET实体数据模型文件。

5、添加数据层的父类 BaseDAL.cs

前面数据层接口和业务层接口都已经添加好了，那么现在来添加数据层类和业务层类

在DAL 项目中添加 EntityFramework.dll 和 System.Data.Entity.dll 的引用

  using System; using System.Collections.Generic; using System.Data.Entity; using System.Data.Entity.Infrastructure; using System.Linq; using System.Linq.Expressions; using System.Reflection; using System.Text; using Model;  namespace DAL {     /// <summary>     /// 数据层 父类     /// </summary>     /// <typeparam name="T"></typeparam>     public class BaseDAL<T> : IDAL.IBaseDAL<T> where T : class,new()     {         /// <summary>         /// EF上下文对象         /// </summary>         DbContext db = new OAEntities(); //new DBContextFactory().GetDbContext();//           #region 1.0 新增 实体 +int Add(T model)         /// <summary>         /// 新增 实体         /// </summary>         /// <param name="model"></param>         /// <returns></returns>         public int Add(T model)         {             db.Set<T>().Add(model);             return db.SaveChanges();//保存成功后，会将自增的id设置给 model的 主键属性，并返回受影响行数         }         #endregion          #region 2.0 根据 id 删除 +int Del(T model)         /// <summary>         /// 根据 id 删除         /// </summary>         /// <param name="model">包含要删除id的对象</param>         /// <returns></returns>         public int Del(T model)         {             db.Set<T>().Attach(model);             db.Set<T>().Remove(model);             return db.SaveChanges();         }         #endregion          #region 3.0 根据条件删除 +int DelBy(Expression<Func<T, bool>> delWhere)         /// <summary>         /// 3.0 根据条件删除         /// </summary>         /// <param name="delWhere"></param>         /// <returns></returns>         public int DelBy(Expression<Func<T, bool>> delWhere)         {             //3.1查询要删除的数据             List<T> listDeleting = db.Set<T>().Where(delWhere).ToList();             //3.2将要删除的数据 用删除方法添加到 EF 容器中             listDeleting.ForEach(u =>             {                 db.Set<T>().Attach(u);//先附加到 EF容器                 db.Set<T>().Remove(u);//标识为 删除 状态             });             //3.3一次性 生成sql语句到数据库执行删除             return db.SaveChanges();         }         #endregion          #region 4.0 修改 +int Modify(T model, params string[] proNames)         /// <summary>         /// 4.0 修改，如：         /// T u = new T() { uId = 1, uLoginName = "asdfasdf" };         /// this.Modify(u, "uLoginName");         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         public int Modify(T model, params string[] proNames)         {             //4.1将 对象 添加到 EF中             DbEntityEntry entry = db.Entry<T>(model);             //4.2先设置 对象的包装 状态为 Unchanged             entry.State = System.Data.EntityState.Unchanged;             //4.3循环 被修改的属性名 数组             foreach (string proName in proNames)             {                 //4.4将每个 被修改的属性的状态 设置为已修改状态;后面生成update语句时，就只为已修改的属性 更新                 entry.Property(proName).IsModified = true;             }             //4.4一次性 生成sql语句到数据库执行             return db.SaveChanges();         }         #endregion          #region 4.0 批量修改 +int Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         /// <summary>         /// 4.0 批量修改         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="whereLambda">查询条件</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         public int ModifyBy(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         {             //4.1查询要修改的数据             List<T> listModifing = db.Set<T>().Where(whereLambda).ToList();              //获取 实体类 类型对象             Type t = typeof(T); // model.GetType();             //获取 实体类 所有的 公有属性             List<PropertyInfo> proInfos = t.GetProperties(BindingFlags.Instance | BindingFlags.Public).ToList();             //创建 实体属性 字典集合             Dictionary<string, PropertyInfo> dictPros = new Dictionary<string, PropertyInfo>();             //将 实体属性 中要修改的属性名 添加到 字典集合中 键：属性名  值：属性对象             proInfos.ForEach(p =>             {                 if (modifiedProNames.Contains(p.Name))                 {                     dictPros.Add(p.Name, p);                 }             });              //4.3循环 要修改的属性名             foreach (string proName in modifiedProNames)             {                 //判断 要修改的属性名是否在 实体类的属性集合中存在                 if (dictPros.ContainsKey(proName))                 {                     //如果存在，则取出要修改的 属性对象                     PropertyInfo proInfo = dictPros[proName];                     //取出 要修改的值                     object newValue = proInfo.GetValue(model, null); //object newValue = model.uName;                      //4.4批量设置 要修改 对象的 属性                     foreach (T usrO in listModifing)                     {                         //为 要修改的对象 的 要修改的属性 设置新的值                         proInfo.SetValue(usrO, newValue, null); //usrO.uName = newValue;                     }                 }             }             //4.4一次性 生成sql语句到数据库执行             return db.SaveChanges();         }         #endregion          #region 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// <summary>         /// 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// </summary>         /// <param name="whereLambda"></param>         /// <returns></returns>         public List<T> GetListBy(Expression<Func<T, bool>> whereLambda)         {             return db.Set<T>().Where(whereLambda).ToList();         }         #endregion          #region 5.1 根据条件 排序 和查询 + List<T> GetListBy<TKey>         /// <summary>         /// 5.1 根据条件 排序 和查询         /// </summary>         /// <typeparam name="TKey">排序字段类型</typeparam>         /// <param name="whereLambda">查询条件 lambda表达式</param>         /// <param name="orderLambda">排序条件 lambda表达式</param>         /// <returns></returns>         public List<T> GetListBy<TKey>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderLambda)         {             return db.Set<T>().Where(whereLambda).OrderBy(orderLambda).ToList();         }         #endregion          #region 6.0 分页查询 + List<T> GetPagedList<TKey>         /// <summary>         /// 6.0 分页查询 + List<T> GetPagedList<TKey>         /// </summary>         /// <param name="pageIndex">页码</param>         /// <param name="pageSize">页容量</param>         /// <param name="whereLambda">条件 lambda表达式</param>         /// <param name="orderBy">排序 lambda表达式</param>         /// <returns></returns>         public List<T> GetPagedList<TKey>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderBy)         {             // 分页 一定注意： Skip 之前一定要 OrderBy             return db.Set<T>().Where(whereLambda).OrderBy(orderBy).Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();         }         #endregion     } }  View Code

6、拷贝IDAL.tt到DAL项目中，改名为DAL.tt，然后修改T4模板

按Ctrl+S 自动生成代码，自动生成的DAL.cs如下：

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using IDAL;  namespace DAL {     public partial class Bill_LeaveDAL : BaseDAL<Model.Bill_Leave>,IBill_LeaveDAL     {     }      public partial class oldWF_AutoTransactNodeDAL : BaseDAL<Model.oldWF_AutoTransactNode>,IoldWF_AutoTransactNodeDAL     {     }      public partial class oldWF_BillFlowNodeDAL : BaseDAL<Model.oldWF_BillFlowNode>,IoldWF_BillFlowNodeDAL     {     }      public partial class oldWF_BillFlowNodeRemarkDAL : BaseDAL<Model.oldWF_BillFlowNodeRemark>,IoldWF_BillFlowNodeRemarkDAL     {     }      public partial class oldWF_BillStateDAL : BaseDAL<Model.oldWF_BillState>,IoldWF_BillStateDAL     {     }      public partial class oldWF_NodeDAL : BaseDAL<Model.oldWF_Node>,IoldWF_NodeDAL     {     }      public partial class oldWF_NodeStateDAL : BaseDAL<Model.oldWF_NodeState>,IoldWF_NodeStateDAL     {     }      public partial class oldWF_WorkFlowDAL : BaseDAL<Model.oldWF_WorkFlow>,IoldWF_WorkFlowDAL     {     }      public partial class oldWF_WorkFlowNodeDAL : BaseDAL<Model.oldWF_WorkFlowNode>,IoldWF_WorkFlowNodeDAL     {     }      public partial class Ou_DepartmentDAL : BaseDAL<Model.Ou_Department>,IOu_DepartmentDAL     {     }      public partial class Ou_PermissionDAL : BaseDAL<Model.Ou_Permission>,IOu_PermissionDAL     {     }      public partial class Ou_RoleDAL : BaseDAL<Model.Ou_Role>,IOu_RoleDAL     {     }      public partial class Ou_RolePermissionDAL : BaseDAL<Model.Ou_RolePermission>,IOu_RolePermissionDAL     {     }      public partial class Ou_UserInfoDAL : BaseDAL<Model.Ou_UserInfo>,IOu_UserInfoDAL     {     }      public partial class Ou_UserRoleDAL : BaseDAL<Model.Ou_UserRole>,IOu_UserRoleDAL     {     }      public partial class Ou_UserVipPermissionDAL : BaseDAL<Model.Ou_UserVipPermission>,IOu_UserVipPermissionDAL     {     }      public partial class W_WorkFlowDAL : BaseDAL<Model.W_WorkFlow>,IW_WorkFlowDAL     {     }      public partial class W_WorkFlowBranchDAL : BaseDAL<Model.W_WorkFlowBranch>,IW_WorkFlowBranchDAL     {     }      public partial class W_WorkFlowNodeDAL : BaseDAL<Model.W_WorkFlowNode>,IW_WorkFlowNodeDAL     {     }      public partial class W_WrokFlowRoleDAL : BaseDAL<Model.W_WrokFlowRole>,IW_WrokFlowRoleDAL     {     }      public partial class WR_WorkFlowApplyDAL : BaseDAL<Model.WR_WorkFlowApply>,IWR_WorkFlowApplyDAL     {     }      public partial class WR_WrokFlowApplyDetailsDAL : BaseDAL<Model.WR_WrokFlowApplyDetails>,IWR_WrokFlowApplyDetailsDAL     {     }   }  View Code

7、添加业务层的父类BaseBLL.cs

  using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Text; using System.Reflection;  namespace BLL {     /// <summary>     /// 业务层父类     /// </summary>     /// <typeparam name="T"></typeparam>     public abstract class BaseBLL<T> : IBLL.IBaseBLL<T> where T : class,new()     {         public BaseBLL()         {             SetDAL();         }          //1.数据层接口 对象 - 等待 被实例化         protected IDAL.IBaseDAL<T> idal;// = new idal.BaseDAL();         /// <summary>         /// 由子类实现，为 业务父类 里的 数据接口对象 设置 值！         /// </summary>         public abstract void SetDAL();          //2.增删改查方法         #region 1.0 新增 实体 +int Add(T model)         /// <summary>         /// 新增 实体         /// </summary>         /// <param name="model"></param>         /// <returns></returns>         public int Add(T model)         {             return idal.Add(model);         }         #endregion          #region 2。0 根据 用户 id 删除 +int Del(int uId)         /// <summary>         /// 根据 用户 id 删除         /// </summary>         /// <param name="uId"></param>         /// <returns></returns>         public int Del(T model)         {             return idal.Del(model);         }         #endregion          #region 3.0 根据条件删除 +int DelBy(Expression<Func<T, bool>> delWhere)         /// <summary>         /// 3.0 根据条件删除         /// </summary>         /// <param name="delWhere"></param>         /// <returns></returns>         public int DelBy(Expression<Func<T, bool>> delWhere)         {             return idal.DelBy(delWhere);         }         #endregion          #region 4.0 修改 +int Modify(T model, params string[] proNames)         /// <summary>         /// 4.0 修改，如：         /// </summary>         /// <param name="model">要修改的实体对象</param>         /// <param name="proNames">要修改的 属性 名称</param>         /// <returns></returns>         public int Modify(T model, params string[] proNames)         {             return idal.Modify(model, proNames);         }         #endregion          #region  4.0 批量修改 +int Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         /// <summary>         ///  4.0 批量修改 +int Modify(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         /// </summary>         /// <param name="model"></param>         /// <param name="whereLambda"></param>         /// <param name="modifiedProNames"></param>         /// <returns></returns>         public int ModifyBy(T model, Expression<Func<T, bool>> whereLambda, params string[] modifiedProNames)         {             return idal.ModifyBy(model, whereLambda, modifiedProNames);         }         #endregion          #region 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// <summary>         /// 5.0 根据条件查询 +List<T> GetListBy(Expression<Func<T,bool>> whereLambda)         /// </summary>         /// <param name="whereLambda"></param>         /// <returns></returns>         public List<T> GetListBy(Expression<Func<T, bool>> whereLambda)         {             return idal.GetListBy(whereLambda);         }         #endregion          #region 5.1 根据条件 排序 和查询 + List<T> GetListBy<TKey>         /// <summary>         /// 5.1 根据条件 排序 和查询         /// </summary>         /// <typeparam name="TKey">排序字段类型</typeparam>         /// <param name="whereLambda">查询条件 lambda表达式</param>         /// <param name="orderLambda">排序条件 lambda表达式</param>         /// <returns></returns>         public List<T> GetListBy<TKey>(Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderLambda)         {             return idal.GetListBy(whereLambda, orderLambda);         }         #endregion          #region 6.0 分页查询 + List<T> GetPagedList<TKey>         /// <summary>         /// 6.0 分页查询 + List<T> GetPagedList<TKey>         /// </summary>         /// <param name="pageIndex">页码</param>         /// <param name="pageSize">页容量</param>         /// <param name="whereLambda">条件 lambda表达式</param>         /// <param name="orderBy">排序 lambda表达式</param>         /// <returns></returns>         public List<T> GetPagedList<TKey>(int pageIndex, int pageSize, Expression<Func<T, bool>> whereLambda, Expression<Func<T, TKey>> orderBy)         {             return idal.GetPagedList(pageIndex, pageSize, whereLambda, orderBy);         }         #endregion     } }  View Code

8、同样的拷贝IBLL.tt到BLL项目下，重命名为BLL.tt，然后修改T4模板，按Ctrl+S 自动生成代码，自动生成的BLL.cs如下：

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using IBLL;  namespace BLL {     public partial class Bill_LeaveBLL : BaseBLL<Model.Bill_Leave>,IBill_LeaveBLL     {     }      public partial class oldWF_AutoTransactNodeBLL : BaseBLL<Model.oldWF_AutoTransactNode>,IoldWF_AutoTransactNodeBLL     {     }      public partial class oldWF_BillFlowNodeBLL : BaseBLL<Model.oldWF_BillFlowNode>,IoldWF_BillFlowNodeBLL     {     }      public partial class oldWF_BillFlowNodeRemarkBLL : BaseBLL<Model.oldWF_BillFlowNodeRemark>,IoldWF_BillFlowNodeRemarkBLL     {     }      public partial class oldWF_BillStateBLL : BaseBLL<Model.oldWF_BillState>,IoldWF_BillStateBLL     {     }      public partial class oldWF_NodeBLL : BaseBLL<Model.oldWF_Node>,IoldWF_NodeBLL     {     }      public partial class oldWF_NodeStateBLL : BaseBLL<Model.oldWF_NodeState>,IoldWF_NodeStateBLL     {     }      public partial class oldWF_WorkFlowBLL : BaseBLL<Model.oldWF_WorkFlow>,IoldWF_WorkFlowBLL     {     }      public partial class oldWF_WorkFlowNodeBLL : BaseBLL<Model.oldWF_WorkFlowNode>,IoldWF_WorkFlowNodeBLL     {     }      public partial class Ou_DepartmentBLL : BaseBLL<Model.Ou_Department>,IOu_DepartmentBLL     {     }      public partial class Ou_PermissionBLL : BaseBLL<Model.Ou_Permission>,IOu_PermissionBLL     {     }      public partial class Ou_RoleBLL : BaseBLL<Model.Ou_Role>,IOu_RoleBLL     {     }      public partial class Ou_RolePermissionBLL : BaseBLL<Model.Ou_RolePermission>,IOu_RolePermissionBLL     {     }      public partial class Ou_UserInfoBLL : BaseBLL<Model.Ou_UserInfo>,IOu_UserInfoBLL     {     }      public partial class Ou_UserRoleBLL : BaseBLL<Model.Ou_UserRole>,IOu_UserRoleBLL     {     }      public partial class Ou_UserVipPermissionBLL : BaseBLL<Model.Ou_UserVipPermission>,IOu_UserVipPermissionBLL     {     }      public partial class W_WorkFlowBLL : BaseBLL<Model.W_WorkFlow>,IW_WorkFlowBLL     {     }      public partial class W_WorkFlowBranchBLL : BaseBLL<Model.W_WorkFlowBranch>,IW_WorkFlowBranchBLL     {     }      public partial class W_WorkFlowNodeBLL : BaseBLL<Model.W_WorkFlowNode>,IW_WorkFlowNodeBLL     {     }      public partial class W_WrokFlowRoleBLL : BaseBLL<Model.W_WrokFlowRole>,IW_WrokFlowRoleBLL     {     }      public partial class WR_WorkFlowApplyBLL : BaseBLL<Model.WR_WorkFlowApply>,IWR_WorkFlowApplyBLL     {     }      public partial class WR_WrokFlowApplyDetailsBLL : BaseBLL<Model.WR_WrokFlowApplyDetails>,IWR_WrokFlowApplyDetailsBLL     {     }   }  View Code

到此，业务父类、业务类、数据父类、数据类都已经创建好了，里面有些东西还需要优化的，后续一步一步完善。