在前篇中我們已經將User類中的代碼做了具體的實現，但仍然有多個實體類未實現，以后可能還會增加新的數據表，數據表結構也有可能發生變化，所以我們使用T4模板來完成類的生成，這樣就算數據庫表發生了改變，也會自動根據改變后的實體對類進行重新生成。
下面是數據訪問層的T4模板文件 Dal.tt
<#@ 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);//EF實體文件在項目中的路徑string inputFile = @"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#><#//這里為命名空間部分，手動更改為相應的命名空間 #>using PMS.IDAL;using PMS.Model;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.DAL{<#// Emit Entity Typesforeach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){ //fileManager.StartNewFile(entity.Name + "RepositoryExt.cs"); //BeginNamespace(namespaceName, code); #> public partial class <#=entity.Name#>Dal :BaseDal<<#=entity.Name#>>,I<#=entity.Name#>Dal { }<#}#> }我們將EF實體文件路徑、命名空間更改為對應的值時，Ctrl+S保存，即可生成對應的其他類型的數據訪問類
其他層中也大同小異，只需要做對應的更改即可，下面我將提供相應的代碼
IDAL層
IDal.tt
<#@ 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 = @"..//PMS.Model//PMS.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;using System.Threading.Tasks;using PMS.Model;namespace PMS.IDAL{ <#// Emit Entity Typesforeach (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#>Dal :IBaseDal<<#=entity.Name#>> { }<#}#> }IDbSession.tt
<#@ 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 = @"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#>using System;using System.Collections.Generic;using System.Data.Entity;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.IDAL{ public partial interface IDbSession {<#// Emit Entity Typesforeach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){ //fileManager.StartNewFile(entity.Name + "RepositoryExt.cs"); //BeginNamespace(namespaceName, code); #> I<#=entity.Name#>Dal <#=entity.Name#>Dal{get;set;}<#}#> } }DALFactory層
SimpleDalFactory.tt
<#@ 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 =@"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#>using SW.OA.IDAL;using System;using System.Collections.Generic;using System.Configuration;using System.Linq;using System.Reflection;using System.Text;using System.Threading.Tasks;namespace SW.OA.DALFactory{ public partial class AbstractFactory { <#foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){ #> public static I<#=entity.Name#>Dal Create<#=entity.Name#>Dal() { string fullClassName = NameSpace + ".<#=entity.Name#>Dal"; return CreateInstance(fullClassName) as I<#=entity.Name#>Dal; }<#}#> } }DbSession.tt
<#@ 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 = @"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#>using PMS.DAL;using PMS.IDAL;using PMS.Model;using System;using System.Collections.Generic;using System.Data.Entity;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.DALFactory{ public partial class DBSession : IDBSession {<#// Emit Entity Typesforeach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){ //fileManager.StartNewFile(entity.Name + "RepositoryExt.cs"); //BeginNamespace(namespaceName, code); #> private I<#=entity.Name#>Dal _<#=entity.Name#>Dal; public I<#=entity.Name#>Dal <#=entity.Name#>Dal { get { if(_<#=entity.Name#>Dal == null) { _<#=entity.Name#>Dal = AbstractFactory.Create<#=entity.Name#>Dal(); } return _<#=entity.Name#>Dal; } set { _<#=entity.Name#>Dal = value; } }<#}#> } }BLL層
Service.tt
<#@ 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 = @"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#>using PMS.IBLL;using PMS.Model;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.BLL{<#// Emit Entity Typesforeach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){ //fileManager.StartNewFile(entity.Name + "RepositoryExt.cs"); //BeginNamespace(namespaceName, code); #> public partial class <#=entity.Name#>Service :BaseService<<#=entity.Name#>>,I<#=entity.Name#>Service { public override void SetCurrentDal() { CurrentDal = this.CurrentDbSession.<#=entity.Name#>Dal; } } <#}#> }BLL層
IService.tt
<#@ 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 = @"..//PMS.Model//PMS.edmx";EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);string namespaceName = code.VsNamespaceSuggestion();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);#>using PMS.Model;using PMS.Model.Search;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PMS.IBLL{<#// Emit Entity Typesforeach (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#>Service : IBaseService<<#=entity.Name#>> { } <#}#> }以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VeVb武林網。
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