ahjesus使用T4模板自动维护实体

在entity项目里新建模板DBEntity.tt

<#@ template debug="false" hostspecific="true" language="C#" #><#@ include file="$(SolutionDir)/Packages/T4.TemplateFileManager.2.1.2/tools/ttinc/TemplateFilemanager.CS.ttinclude" #><#@ include file="$(SolutionDir)/Packages/T4.TemplateFileManager.2.1.2/tools/ttinc/DbHelper.CS.ttinclude"  #><#@ output extension=".txt" #><# // Recommended editor: Tangible T4 Editor (http://t4-editor.tangible-engineering.com/Download_T4Editor_Plus_ModelingTools.html)// after save SimpleSample.tt, the output will be generated in the TestFolder of the PRojectvar fileProperties = new FileProperties(){    BuildAction = BuildAction.Compile};var fileManager = TemplateFileManager.Create(this);fileManager.IsAutoIndentEnabled = true;fileManager.CanOverwriteExistingFile = true;fileManager.StartHeader();#>//<summary file="$filename$" company="ldy">//------------------------------------------------------------------------------// <auto-generated>//    此代码是根据模板生成的。////    手动更改此文件可能会导致应用程序中发生异常行为。//    如果重新生成代码，则将覆盖对此文件的手动更改。//出自 http://www.VEVb.com/ahjesus 尊重作者辛苦劳动成果,转载请注明出处,谢谢!// </auto-generated>//------------------------------------------------------------------------------// </summary><# fileManager.EndBlock();var paramTmpl = ParamTextTemplate.Create(this.Host);var session = ParamTextTemplate.GetSessionObject();    var DbTables = DbHelper.GetDbTables(config.ConnectionString, config.DbDatabase);    foreach(var table in DbTables){        fileManager.StartNewFile(table.TableName + ".cs", config.NameSpace,"",fileProperties);        session["ConnectionString"] = config.ConnectionString;        session["DbDatabase"] = config.DbDatabase;        session["NameSpace"] = config.NameSpace;        session["TableName"] = table.TableName;        string output = paramTmpl.TransformText("EntityContent.tt", session);        this.Write(output);    }fileManager.Process();#><#+     public class config{    public static readonly string ConnectionString="Data Source=192.168.1.10;Initial Catalog=TongJi;User ID=sa;PassWord=123456";    public static readonly string DbDatabase="TongJi";    public static readonly string TableName="TAd";    public static readonly string NameSpace="__System.Entity";}#>

再新建EntityContent.tt

<#@ template debug="false" hostspecific="false" language="C#" #><#@ assembly name="System.Core.dll" #><#@ assembly name="System.Data.dll" #><#@ assembly name="System.Data.DataSetExtensions.dll" #><#@ assembly name="System.xml.dll" #><#@ import namespace="System" #><#@ import namespace="System.Xml" #><#@ import namespace="System.Linq" #><#@ import namespace="System.Data" #><#@ import namespace="System.Data.SqlClient" #><#@ import namespace="System.Collections.Generic" #><#@ import namespace="System.IO" #><#@ parameter name="ConnectionString" type="System.String" #><#@ parameter name="DbDatabase" type="System.String" #><#@ parameter name="TableName" type="System.String" #><#@ parameter name="NameSpace" type="System.String" #><#@ include file="$(SolutionDir)/Packages/T4.TemplateFileManager.2.1.2/tools/ttinc/DbHelper.CS.ttinclude"  #><#@ output extension=".txt" #><#if(ConnectionString!=null&&DbDatabase!=null&&TableName!=null&&NameSpace!=null){#>using System;using System.Collections.Generic;namespace <#=NameSpace#>{            public class <#=TableName#> : BaseEntity    {        <#foreach(DbColumn column in DbHelper.GetDbColumns(ConnectionString, DbDatabase, TableName)){#>        /// <summary>        /// <#=GetRemark(column.Remark)#>        /// </summary>                public <#=column.CSharpType#><#if(column.CommonType.IsValueType && column.IsNullable){#>?<#}#> <#=column.ColumnName#> { get; set; }        <#}#>           }}<#}#><#+public string GetRemark(string str){    char[] strArr =str.ToCharArray();    string newStr = "";    foreach (char cr in strArr)    {    if (cr == (char)10)    {    newStr = newStr+cr.ToString()+"///";    }    else{    newStr += cr.ToString();    }    }    return newStr;}#>

注意到有一段

<#@ include file="$(SolutionDir)/Packages/T4.TemplateFileManager.2.1.2/tools/ttinc/TemplateFilemanager.CS.ttinclude" #><#@ include file="$(SolutionDir)/Packages/T4.TemplateFileManager.2.1.2/tools/ttinc/DbHelper.CS.ttinclude" #>在解决方案文件夹目录下的Packages（没有就新建）里新建T4.TemplateFileManager.2.1.2/tools/ttinc/这个目录

新建文件TemplateFilemanager.CS.ttinclude

<#@ assembly name="System.Data.DataSetExtensions.dll" #><#@ import namespace="System" #><#@ import namespace="System.Xml" #><#@ import namespace="System.Linq" #><#@ import namespace="System.Data" #><#@ import namespace="System.Data.SqlClient" #><#@ import namespace="System.Collections.Generic" #><#@ import namespace="System.IO" #><#+    public class DbHelper    {        #region GetDbTables                public static List<DbTable> GetDbTables(string connectionString, string database, string tables = null)        {                        if (!string.IsNullOrEmpty(tables))            {                tables = string.Format(" and obj.name in ('{0}')", tables.Replace(",", "','"));            }            #region SQL            string sql = string.Format(@"SELECT                                    obj.name tablename,                                    schem.name schemname,                                    idx.rows,                                    CAST                                    (                                        CASE                                             WHEN (SELECT COUNT(1) FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=1) >=1 THEN 1                                            ELSE 0                                        END                                     AS BIT) HasprimaryKey                                                                             from {0}.sys.objects obj                                     inner join {0}.dbo.sysindexes idx on obj.object_id=idx.id and idx.indid<=1                                    INNER JOIN {0}.sys.schemas schem ON obj.schema_id=schem.schema_id                                    where type='U' {1}                                    order by obj.name", database, tables);            #endregion            DataTable dt = GetDataTable(connectionString, sql);            return dt.Rows.Cast<DataRow>().Select(row => new DbTable            {                TableName = row.Field<string>("tablename"),                SchemaName = row.Field<string>("schemname"),                Rows = row.Field<int>("rows"),                HasPrimaryKey = row.Field<bool>("HasPrimaryKey")            }).ToList();        }        #endregion        #region GetDbColumns                public static List<DbColumn> GetDbColumns(string connectionString, string database, string tableName, string schema = "dbo")        {            #region SQL            string sql = string.Format(@"                                    WITH indexCTE AS                                    (                                        SELECT                                         ic.column_id,                                        ic.index_column_id,                                        ic.object_id                                            FROM {0}.sys.indexes idx                                        INNER JOIN {0}.sys.index_columns ic ON idx.index_id = ic.index_id AND idx.object_id = ic.object_id                                        WHERE  idx.object_id =OBJECT_ID(@tableName) AND idx.is_primary_key=1                                    )                                    select                                    colm.column_id ColumnID,                                    CAST(CASE WHEN indexCTE.column_id IS NULL THEN 0 ELSE 1 END AS BIT) IsPrimaryKey,                                    co