将一些公用的东西弄到一个类库DM.T4里面，哪个项目需要用到t4生成的话，将DM.T4的生成事件中将dll和ModelAuto.ttinclude复制到需要使用T4的项目的生成目录下，如果这样
copy $(TargetPath) $(SolutionDir)DM.Domain\$(OutDir)
copy $(TargetDir)ModelAuto.ttinclude $(SolutionDir)DM.Domain\$(OutDir)
然后在需要就可以添加T4文件了，T4文件头部引入即可，例如下面的这个例子，就是根据表生成一些类
<#@ template debug="true" hostspecific="true" language="C#" #> <#@ output extension=".cs" #> <#@ assembly name="System.Data" #> <#@ assembly name="System.Xml" #> <#@ assembly name="$(TargetDir)DM.T4.dll"#> <#@ import namespace="System" #> <#@ import namespace="System.Xml" #> <#@ import namespace="System.Data" #> <#@ import namespace="System.Data.SqlClient" #> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.Text.RegularExpressions"#> <#@ import namespace="DM.T4"#> <#@ include file="$(TargetDir)ModelAuto.ttinclude"#> <# var manager2 = new Manager(Host, GenerationEnvironment, true) { OutputPath = Path.GetDirectoryName(Host.TemplateFile)}; #> <# ModelManager manager = new ModelManager(); List<string> list=manager.GetTableList(); foreach (var item in list) { string tableName=item; DataTable table= manager.GetTableSchema(tableName); string strTableMemo=string.Empty; if(table!=null&&table.Rows.Count>0) { strTableMemo=table.Rows[0]["表说明"].ToString(); } manager2.StartBlock(tableName+"Repository.cs"); #> //------------------------------------------------------------------------------ // <auto-generated> // 此代码从T4模板生成。 // 黄正辉（[email protected]） // 手动更改此文件可能导致应用程序出现意外的行为。 // 如果重新生成代码，将覆盖对此文件的手动更改。 // </auto-generated> //------------------------------------------------------------------------------ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Linq.Expressions; using System.Data.Common; using DM.Domain; using DM.Tools; using DM.Interface; using DM.Interface.IRepository; namespace DM.Repository.BusinessRepository { /// <summary> /// 仓储实现：<#= strTableMemo #> (<#= tableName #>) /// </summary> public partial class <#=tableName #>Repository :RepositoryBase<<#=tableName #>>, I<#=tableName #>Repository,IDependency { /// <summary> /// 插入一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Insert(<#=tableName #> entity) { return base.Insert(entity); } /// <summary> /// 插入一个数据列表 /// </summary> /// <param name="entity">实体列表</param> /// <returns>受影响行数</returns> public virtual int Insert(List<<#=tableName #>> entitys) { return base.Insert(entitys); } /// <summary> /// 修改一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Update(<#=tableName #> entity) { return base.Update(entity); } /// <summary> /// 删除一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Delete(<#=tableName #> entity) { return base.Delete(entity); } /// <summary> /// 根据表达式删除 /// </summary> /// <param name="predicate">实体</param> /// <returns>受影响行数</returns> public virtual int Delete(Expression<Func<<#=tableName #>, bool>> predicate) { return base.Delete(predicate); } /// <summary> /// 根据主键查询一个数据 /// </summary> /// <param name="keyValue">主键值</param> /// <returns>实体</returns> public virtual <#=tableName #> FindEntity(object keyValue) { return base.FindEntity(keyValue); } /// <summary> /// 根据表达式查询一个数据 /// </summary> /// <param name="predicate">表达式</param> /// <returns>实体</returns> public virtual <#=tableName #> FindEntity(Expression<Func<<#=tableName #>, bool>> predicate) { return base.FindEntity(predicate); } /// <summary> /// 查询IQueryable列表 /// </summary> /// <returns>IQueryable列表</returns> public virtual IQueryable<<#=tableName #>> IQueryable() { return base.IQueryable(); } /// <summary> /// 根据表达式查询IQueryable列表数据 /// </summary> /// <param name="predicate">表达式</param> /// <returns>IQueryable列表</returns> public virtual IQueryable<<#=tableName #>> IQueryable(Expression<Func<<#=tableName #>, bool>> predicate) { return base.IQueryable(predicate); } /// <summary> /// 根据Sql查询数据 /// </summary> /// <param name="strSql">Sql</param> /// <returns>数据列表</returns> public virtual List<<#=tableName #>> FindList(string strSql) { return base.FindList(strSql); } /// <summary> /// 根据Sql查询数据 /// </summary> /// <param name="strSql">Sql</param> /// <param name="dbParameter">参数列表</param> /// <returns>数据列表</returns> public virtual List<<#=tableName #>> FindList(string strSql, DbParameter[] dbParameter) { return base.FindList(strSql,dbParameter); } /// <summary> /// 查询分页数据 /// </summary> /// <param name="pagination">分页参数</param> /// <returns>数据列表</returns> public virtual List<<#=tableName #>> FindList(Pagination pagination) { return base.FindList(pagination); } /// <summary> /// 查询表达式查询分页数据 /// </summary> /// <param name="predicate">表达式</param> /// <param name="pagination">分页参数</param> /// <returns>数据列表</returns> public virtual List<<#=tableName #>> FindList(Expression<Func<<#=tableName #>, bool>> predicate, Pagination pagination) { return base.FindList(predicate,pagination); } } } <# manager2.EndBlock(); } manager2.Process(true); #>
生成后的结果是这样的
文件的内容如下
//------------------------------------------------------------------------------ // <auto-generated> // 此代码从T4模板生成。 // 黄正辉（[email protected]） // 手动更改此文件可能导致应用程序出现意外的行为。 // 如果重新生成代码，将覆盖对此文件的手动更改。 // </auto-generated> //------------------------------------------------------------------------------ using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Linq.Expressions; using System.Data.Common; using DM.Domain; using DM.Tools; using DM.Interface; using DM.Interface.IRepository; namespace DM.Repository.BusinessRepository { /// <summary> /// 仓储实现： (Sys_Role) /// </summary> public partial class Sys_RoleRepository :RepositoryBase<Sys_Role>, ISys_RoleRepository,IDependency { /// <summary> /// 插入一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Insert(Sys_Role entity) { return base.Insert(entity); } /// <summary> /// 插入一个数据列表 /// </summary> /// <param name="entity">实体列表</param> /// <returns>受影响行数</returns> public virtual int Insert(List<Sys_Role> entitys) { return base.Insert(entitys); } /// <summary> /// 修改一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Update(Sys_Role entity) { return base.Update(entity); } /// <summary> /// 删除一个数据 /// </summary> /// <param name="entity">实体</param> /// <returns>受影响行数</returns> public virtual int Delete(Sys_Role entity) { return base.Delete(entity); } /// <summary> /// 根据表达式删除 /// </summary> /// <param name="predicate">实体</param> /// <returns>受影响行数</returns> public virtual int Delete(Expression<Func<Sys_Role, bool>> predicate) { return base.Delete(predicate); } /// <summary> /// 根据主键查询一个数据 /// </summary> /// <param name="keyValue">主键值</param> /// <returns>实体</returns> public virtual Sys_Role FindEntity(object keyValue) { return base.FindEntity(keyValue); } /// <summary> /// 根据表达式查询一个数据 /// </summary> /// <param name="predicate">表达式</param> /// <returns>实体</returns> public virtual Sys_Role FindEntity(Expression<Func<Sys_Role, bool>> predicate) { return base.FindEntity(predicate); } /// <summary> /// 查询IQueryable列表 /// </summary> /// <returns>IQueryable列表</returns> public virtual IQueryable<Sys_Role> IQueryable() { return base.IQueryable(); } /// <summary> /// 根据表达式查询IQueryable列表数据 /// </summary> /// <param name="predicate">表达式</param> /// <returns>IQueryable列表</returns> public virtual IQueryable<Sys_Role> IQueryable(Expression<Func<Sys_Role, bool>> predicate) { return base.IQueryable(predicate); } /// <summary> /// 根据Sql查询数据 /// </summary> /// <param name="strSql">Sql</param> /// <returns>数据列表</returns> public virtual List<Sys_Role> FindList(string strSql) { return base.FindList(strSql); } /// <summary> /// 根据Sql查询数据 /// </summary> /// <param name="strSql">Sql</param> /// <param name="dbParameter">参数列表</param> /// <returns>数据列表</returns> public virtual List<Sys_Role> FindList(string strSql, DbParameter[] dbParameter) { return base.FindList(strSql,dbParameter); } /// <summary> /// 查询分页数据 /// </summary> /// <param name="pagination">分页参数</param> /// <returns>数据列表</returns> public virtual List<Sys_Role> FindList(Pagination pagination) { return base.FindList(pagination); } /// <summary> /// 查询表达式查询分页数据 /// </summary> /// <param name="predicate">表达式</param> /// <param name="pagination">分页参数</param> /// <returns>数据列表</returns> public virtual List<Sys_Role> FindList(Expression<Func<Sys_Role, bool>> predicate, Pagination pagination) { return base.FindList(predicate,pagination); } } }
这样就完成了批量生成文件的功能了
项目是DM.T4的项目结构
ModelAuto.ttinclude
<#@ assembly name="System.Core"#> <#@ assembly name="EnvDTE"#> <#@ import namespace="System.Collections.Generic"#> <#@ import namespace="System.IO"#> <#@ import namespace="System.Text"#> <#@ import namespace="Microsoft.VisualStudio.TextTemplating"#> <#+ class Manager { public struct Block { public String Name; public int Start, Length; } public List<Block> blocks = new List<Block>(); public Block currentBlock; public Block footerBlock = new Block(); public Block headerBlock = new Block(); public ITextTemplatingEngineHost host; public ManagementStrategy strategy; public StringBuilder template; public String OutputPath { get; set; } public Manager(ITextTemplatingEngineHost host, StringBuilder template, bool commonHeader) { this.host = host; this.template = template; OutputPath = String.Empty; strategy = ManagementStrategy.Create(host); } public void StartBlock(String name) { currentBlock = new Block { Name = name, Start = template.Length }; } public void StartFooter() { footerBlock.Start = template.Length; } public void EndFooter() { footerBlock.Length = template.Length - footerBlock.Start; } public void StartHeader() { headerBlock.Start = template.Length; } public void EndHeader() { headerBlock.Length = template.Length - headerBlock.Start; } public void EndBlock() { currentBlock.Length = template.Length - currentBlock.Start; blocks.Add(currentBlock); } public void Process(bool split) { String header = template.ToString(headerBlock.Start, headerBlock.Length); String footer = template.ToString(footerBlock.Start, footerBlock.Length); blocks.Reverse(); foreach(Block block in blocks) { String fileName = Path.Combine(OutputPath, block.Name); if (split) { String content = header + template.ToString(block.Start, block.Length) + footer; strategy.CreateFile(fileName, content); template.Remove(block.Start, block.Length); } else { strategy.DeleteFile(fileName); } } } } class ManagementStrategy { internal static ManagementStrategy Create(ITextTemplatingEngineHost host) { return (host is IServiceProvider) ? new VSManagementStrategy(host) : new ManagementStrategy(host); } internal ManagementStrategy(ITextTemplatingEngineHost host) { } internal virtual void CreateFile(String fileName, String content) { File.WriteAllText(fileName, content); } internal virtual void DeleteFile(String fileName) { if (File.Exists(fileName)) File.Delete(fileName); } } class VSManagementStrategy : ManagementStrategy { private EnvDTE.ProjectItem templateProjectItem; internal VSManagementStrategy(ITextTemplatingEngineHost host) : base(host) { IServiceProvider hostServiceProvider = (IServiceProvider)host; if (hostServiceProvider == null) throw new ArgumentNullException("Could not obtain hostServiceProvider"); EnvDTE.DTE dte = (EnvDTE.DTE)hostServiceProvider.GetService(typeof(EnvDTE.DTE)); if (dte == null) throw new ArgumentNullException("Could not obtain DTE from host"); templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile); } internal override void CreateFile(String fileName, String content) { base.CreateFile(fileName, content); ((EventHandler)delegate { templateProjectItem.ProjectItems.AddFromFile(fileName); }).BeginInvoke(null, null, null, null); } internal override void DeleteFile(String fileName) { ((EventHandler)delegate { FindAndDeleteFile(fileName); }).BeginInvoke(null, null, null, null); } private void FindAndDeleteFile(String fileName) { foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems) { if (projectItem.get_FileNames(0) == fileName) { projectItem.Delete(); return; } } } }#>
ModelManager.cs
using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Text; using System.Threading.Tasks; namespace DM.T4 { public class ModelManager { /// <summary> /// 数据库连接字符串 /// </summary> private const string CONNECTION_STRING = "Server=.;Initial Catalog=DocumentManage;User ID=sa;Password=123456"; /// <summary> /// 用户信息表名 /// </summary> private const string PERSONINFO_TABLE_NAME = "USERINFO"; /// <summary> /// 根据表名查询表结构信息 /// </summary> private const string SELECT_SCHEMA_BY_TABLE_NAME = @"select d.name as 表名 --如果表名相同就返回空 , ddd.value as 表说明 --如果表名相同就返回空 , a.colorder as 字段序号 , a.name as 字段名 , (case when columnproperty(a.id, a.name, 'IsIdentity') = 1 then 1 else 0 end ) as 是否自增标识 , (case when ( select count(*) from sys.sysobjects --查询主键 where (name in ( select name from sys.sysindexes where (id = a.id) and (indid in ( select indid from sys.sysindexkeys where (id = a.id) and (colid in ( select colid from sys.syscolumns where (id = a.id) and (name = a.name) ) ) ) ) ) ) and (xtype = 'PK') ) > 0 then 1 else 0 end ) as 主键 --查询主键END , b.name as 数据类型 , a.length as 占用字节数 , columnproperty(a.id, a.name, 'PRECISION') as 长度 , isnull(columnproperty(a.id, a.name, 'Scale'), 0) as 小数位 , (case when a.isnullable = 1 then 1 else 0 end ) as 允许空 , isnull(e.text, '') as 缺省值 , isnull(g.value, '') as 备注 from sys.syscolumns a left join sys.systypes b on a.xtype = b.xusertype inner join sys.sysobjects d on a.id = d.id and d.xtype = 'U' and d.name <> 'dtproperties' left outer join ( select major_id , value from sys.extended_properties where name = 'MS_Description' and minor_id = 0 ) as ddd on a.id = ddd.major_id left join sys.syscomments e on a.cdefault = e.id left join sys.extended_properties g on a.id = g.major_id and a.colid = g.minor_id where d.name='{0}' order by a.id , a.colorder;"; private const string TABLE_FK_SQL = @"select a.name as 约束名, object_name(b.parent_object_id) as 外键表, c.name as 外键列, object_name(b.referenced_object_id) as 主健表, d.name as 主键列 from sys.foreign_keys A inner join sys.foreign_key_columns B on A.object_id=b.constraint_object_id inner join sys.columns C on B.parent_object_id=C.object_id and B.parent_column_id=C.column_id inner join sys.columns D on B.referenced_object_id=d.object_id and B.referenced_column_id=D.column_id where object_name(b.parent_object_id)!=object_name(b.referenced_object_id)"; /// <summary> /// 获得数据连接 /// </summary> /// <returns></returns> private SqlConnection GetConnection() { return new SqlConnection(SqlHelper.sqlConnectionStr); } /// <summary> /// 得到当前用户的所有表名 /// </summary> /// <returns></returns> public List<string> GetTableList() { string sql = "select table_name from information_schema.tables"; DataTable dt = SqlHelper.ExecuteDataTable(sql); List<string> list = new List<string>(); if (dt != null && dt.Rows.Count > 0) { for (int i = 0; i < dt.Rows.Count; i++) { list.Add(dt.Rows[i][0].ToString()); } } return list; } /// <summary> /// 得到所有表主外键关系 /// </summary> /// <returns></returns> public List<FK> GetFK() { DataTable dt = SqlHelper.ExecuteDataTable(TABLE_FK_SQL); List<FK> lst = new List<FK>(); for (int i = 0; i < dt.Rows.Count; i++) { FK fk = new FK() { FKName = dt.Rows[i]["约束名"].ToString(), WJ_Table = dt.Rows[i]["外键表"].ToString(), WJ_Field = dt.Rows[i]["外键列"].ToString(), ZJ_Table = dt.Rows[i]["主健表"].ToString(), ZJ_Field = dt.Rows[i]["主键列"].ToString() }; lst.Add(fk); } return lst; } /// <summary> /// 释放连接 /// </summary> /// <param name="con"></param> private void ReleaseConnection(SqlConnection con) { if (con != null) { if (con.State == ConnectionState.Open) { con.Close(); } } } public DataTable GetTableSchema(string tableName) { DataTable dt = SqlHelper.ExecuteDataTable(string.Format(SELECT_SCHEMA_BY_TABLE_NAME, tableName)); return dt; } /// <summary> /// SQL[不完善,需要的自己改造] /// </summary> /// <param name="type"></param> /// <returns></returns> public string TransFromSqlType(string type) { type = type.ToLower(); switch (type) { case "int": return "int"; case "bigint": return "Int64"; case "smallint": return "Int16"; case "text": case "char": case "nchar": case "ntext": case "nvarchar": case "varchar": return "string"; case "varbinary": case "image": case "binary": return "Byte[]"; case "tinyint": return "byte"; case "bit": return "bool"; case "date": case "time": case "smalldatetime": case "timestamp": case "datetime": return "DateTime"; case "money": case "numeric": case "smallmoney": case "decimal": return "decimal"; case "float": return "double"; case "real": return "Single"; default: return "string"; } } } public class FK { public string FKName { get; set; } public string WJ_Table { get; set; } public string WJ_Field { get; set; } public string ZJ_Table { get; set; } public string ZJ_Field { get; set; } } }
SqlHelper.cs
using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Text; using System.Threading.Tasks; namespace DM.T4 { public class SqlHelper { public static string sqlConnectionStr = "Server=.;Initial Catalog=DocumentManage;User ID=sa;Password=123456"; public static DataTable ExecuteDataTable(string sql, params SqlParameter[] paramList) { using (SqlConnection conn = new SqlConnection(sqlConnectionStr)) { conn.Open(); using (SqlCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); DataTable dt = new DataTable(); SqlDataAdapter adapter = new SqlDataAdapter(command); adapter.Fill(dt); return dt; } } } public static int ExecuteNonQuery(string sql, params SqlParameter[] paramList) { using (SqlConnection conn = new SqlConnection(sqlConnectionStr)) { conn.Open(); using (SqlCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); return command.ExecuteNonQuery(); } } } public static object ExecuteScalar(string sql, params SqlParameter[] paramList) { using (SqlConnection conn = new SqlConnection(sqlConnectionStr)) { conn.Open(); using (SqlCommand command = conn.CreateCommand()) { command.CommandText = sql; command.Parameters.AddRange(paramList); return command.ExecuteScalar(); } } } } }