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使用T4模板生成POCO类

为什么叫T4?因为简写为4个T。

T4(Text Template Transformation Toolkit)是微软官方在VisualStudio 2008中开始使用的代码生成引擎。在 Visual Studio 中,“T4 文本模板”是由一些文本块和控制逻辑组成的混合模板,它可以生成文本文件。 在 Visual C# 或 Visual Basic 中,控制逻辑编写为程序代码的片段。生成的文件可以是任何类型的文本,例如网页、资源文件或任何语言的程序源代码。现在的VS中只要与代码生成相关的场景基本上都能找T4的身影,比如MVC的视图模板,Entity Framwork的DataContext模板等等。

若论灵活性,各种代码生成工具还真不如T4模板。

在VS2013种默认没有了T4模板,取而代之的是文本模板,但是他们的后缀名都是.tt。我们可以通过NuGet安装T4模板。

使用T4模板生成POCO类插图

安装之后,我们在项目中新建项的时候,在VS模板中就多了两项和T4模板相关的模板。

使用T4模板生成POCO类插图1

当我们在新建的T4模板中进行代码编写的时候,默认是没有智能提示的,我们需要再安装一个T4Editor的VS插件tangibleT4EditorPlusModellingToolsVS2013.msi。

下载地址:

https://marketplace.visualstudio.com/items?itemName=tangibleengineeringGmbH.tangibleT4Editor230plusmodelingtoolsforVS2013

 由于我这里用的是VS2013,所以按照13的插件,安装插件时先关闭VS,安装完成之后在T4模板中编写代码时就有了智能提示了。

关于T4模板的详细讲解,大家可以参照一下博客文章:

你必须懂的 T4 模板:体系架构

(译)理解 T4 模板:<#@ parameter #> 指令

我这里要说的是,如何在项目中替代其它的代码工具来使用,比如说,自动生成数据库中的POCO类。

 思路:1、我们要查询中数据库中的表和字段。2、根据数据表名才,将其生成多个POCO类文件

How to do?

开发环境:VS2013

准备工作:添加必须的程序集引用

使用T4模板生成POCO类插图2

在自己电脑上面用everythin找到Microsoft.VisualStudio.TextTemplating.Interfaces.10.0.dll,然后添加引用,如果没有,你就网上下载一个。

方式一

 1、添加一个T4模板文件DbHelper,将其后缀修改为.ttinclude,因为我是将其作为内嵌的T4文件,不修改扩展名的话,会将其当成T4模板文件进行生成。

使用T4模板生成POCO类插图3

<#+    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,                                    colm.name ColumnName,                                    systype.name ColumnType,                                    colm.is_identity IsIdentity,                                    colm.is_nullable IsNullable,                                    cast(colm.max_length as int) ByteLength,                                    (                                        case                                             when systype.name='nvarchar' and colm.max_length>0 then colm.max_length/2                                             when systype.name='nchar' and colm.max_length>0 then colm.max_length/2                                            when systype.name='ntext' and colm.max_length>0 then colm.max_length/2                                             else colm.max_length                                        end                                    ) CharLength,                                    cast(colm.precision as int) Precision,                                    cast(colm.scale as int) Scale,                                    prop.value Remark                                    from {0}.sys.columns colm                                    inner join {0}.sys.types systype on colm.system_type_id=systype.system_type_id and colm.user_type_id=systype.user_type_id                                    left join {0}.sys.extended_properties prop on colm.object_id=prop.major_id and colm.column_id=prop.minor_id                                    LEFT JOIN indexCTE ON colm.column_id=indexCTE.column_id AND colm.object_id=indexCTE.object_id                                                                            where colm.object_id=OBJECT_ID(@tableName)                                    order by colm.column_id", database);            #endregion            SqlParameter param = new SqlParameter("@tableName", SqlDbType.NVarChar, 100) { Value = string.Format("{0}.{1}.{2}", database, schema, tableName) };            DataTable dt = GetDataTable(connectionString, sql, param);            return dt.Rows.Cast<DataRow>().Select(row => new DbColumn()            {                ColumnID = row.Field<int>("ColumnID"),                IsPrimaryKey = row.Field<bool>("IsPrimaryKey"),                ColumnName = row.Field<string>("ColumnName"),                ColumnType = row.Field<string>("ColumnType"),                IsIdentity = row.Field<bool>("IsIdentity"),                IsNullable = row.Field<bool>("IsNullable"),                ByteLength = row.Field<int>("ByteLength"),                CharLength = row.Field<int>("CharLength"),                Scale = row.Field<int>("Scale"),                Remark = row["Remark"].ToString()            }).ToList();        }        #endregion             #region GetDataTable                public static DataTable GetDataTable(string connectionString, string commandText, params SqlParameter[] parms)        {            using (SqlConnection connection = new SqlConnection(connectionString))            {                SqlCommand command = connection.CreateCommand();                command.CommandText = commandText;                command.Parameters.AddRange(parms);                SqlDataAdapter adapter = new SqlDataAdapter(command);                DataTable dt = new DataTable();                adapter.Fill(dt);                return dt;            }        }        #endregion    }    #region DbTable    /// <summary>    /// 表结构    /// </summary>    public sealed class DbTable    {        /// <summary>        /// 表名称        /// </summary>        public string TableName { get; set; }        /// <summary>        /// 表的架构        /// </summary>        public string SchemaName { get; set; }        /// <summary>        /// 表的记录数        /// </summary>        public int Rows { get; set; }        /// <summary>        /// 是否含有主键        /// </summary>        public bool HasPrimaryKey { get; set; }    }    #endregion    #region DbColumn    /// <summary>    /// 表字段结构    /// </summary>    public sealed class DbColumn    {        /// <summary>        /// 字段ID        /// </summary>        public int ColumnID { get; set; }        /// <summary>        /// 是否主键        /// </summary>        public bool IsPrimaryKey { get; set; }        /// <summary>        /// 字段名称        /// </summary>        public string ColumnName { get; set; }        /// <summary>        /// 字段类型        /// </summary>        public string ColumnType { get; set; }        /// <summary>        /// 数据库类型对应的C#类型        /// </summary>        public string CSharpType        {            get            {                return SqlServerDbTypeMap.MapCsharpType(ColumnType);            }        }        /// <summary>        ///         /// </summary>        public Type CommonType        {            get            {                return SqlServerDbTypeMap.MapCommonType(ColumnType);            }        }        /// <summary>        /// 字节长度        /// </summary>        public int ByteLength { get; set; }        /// <summary>        /// 字符长度        /// </summary>        public int CharLength { get; set; }        /// <summary>        /// 小数位        /// </summary>        public int Scale { get; set; }        /// <summary>        /// 是否自增列        /// </summary>        public bool IsIdentity { get; set; }        /// <summary>        /// 是否允许空        /// </summary>        public bool IsNullable { get; set; }        /// <summary>        /// 描述        /// </summary>        public string Remark { get; set; }    }    #endregion    #region SqlServerDbTypeMap    public class SqlServerDbTypeMap    {        public static string MapCsharpType(string dbtype)        {            if (string.IsNullOrEmpty(dbtype)) return dbtype;            dbtype = dbtype.ToLower();            string csharpType = "object";            switch (dbtype)            {                case "bigint": csharpType = "long"; break;                case "binary": csharpType = "byte[]"; break;                case "bit": csharpType = "bool"; break;                case "char": csharpType = "string"; break;                case "date": csharpType = "DateTime"; break;                case "datetime": csharpType = "DateTime"; break;                case "datetime2": csharpType = "DateTime"; break;                case "datetimeoffset": csharpType = "DateTimeOffset"; break;                case "decimal": csharpType = "decimal"; break;                case "float": csharpType = "double"; break;                case "image": csharpType = "byte[]"; break;                case "int": csharpType = "int"; break;                case "money": csharpType = "decimal"; break;                case "nchar": csharpType = "string"; break;                case "ntext": csharpType = "string"; break;                case "numeric": csharpType = "decimal"; break;                case "nvarchar": csharpType = "string"; break;                case "real": csharpType = "Single"; break;                case "smalldatetime": csharpType = "DateTime"; break;                case "smallint": csharpType = "short"; break;                case "smallmoney": csharpType = "decimal"; break;                case "sql_variant": csharpType = "object"; break;                case "sysname": csharpType = "object"; break;                case "text": csharpType = "string"; break;                case "time": csharpType = "TimeSpan"; break;                case "timestamp": csharpType = "byte[]"; break;                case "tinyint": csharpType = "byte"; break;                case "uniqueidentifier": csharpType = "Guid"; break;                case "varbinary": csharpType = "byte[]"; break;                case "varchar": csharpType = "string"; break;                case "xml": csharpType = "string"; break;                default: csharpType = "object"; break;            }            return csharpType;        }                   public static Type MapCommonType(string dbtype)        {            if (string.IsNullOrEmpty(dbtype)) return Type.Missing.GetType();            dbtype = dbtype.ToLower();            Type commonType = typeof(object);            switch (dbtype)            {                case "bigint": commonType = typeof(long); break;                case "binary": commonType = typeof(byte[]); break;                case "bit": commonType = typeof(bool); break;                case "char": commonType = typeof(string); break;                case "date": commonType = typeof(DateTime); break;                case "datetime": commonType = typeof(DateTime); break;                case "datetime2": commonType = typeof(DateTime); break;                case "datetimeoffset": commonType = typeof(DateTimeOffset); break;                case "decimal": commonType = typeof(decimal); break;                case "float": commonType = typeof(double); break;                case "image": commonType = typeof(byte[]); break;                case "int": commonType = typeof(int); break;                case "money": commonType = typeof(decimal); break;                case "nchar": commonType = typeof(string); break;                case "ntext": commonType = typeof(string); break;                case "numeric": commonType = typeof(decimal); break;                case "nvarchar": commonType = typeof(string); break;                case "real": commonType = typeof(Single); break;                case "smalldatetime": commonType = typeof(DateTime); break;                case "smallint": commonType = typeof(short); break;                case "smallmoney": commonType = typeof(decimal); break;                case "sql_variant": commonType = typeof(object); break;                case "sysname": commonType = typeof(object); break;                case "text": commonType = typeof(string); break;                case "time": commonType = typeof(TimeSpan); break;                case "timestamp": commonType = typeof(byte[]); break;                case "tinyint": commonType = typeof(byte); break;                case "uniqueidentifier": commonType = typeof(Guid); break;                case "varbinary": commonType = typeof(byte[]); break;                case "varchar": commonType = typeof(string); break;                case "xml": commonType = typeof(string); break;                default: commonType = typeof(object); break;            }            return commonType;        }    }    #endregion    #>

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上面的代码就是查询数据库中的表和字段。

2、同样添加另一个T4模板文件,并修改后缀名Manager.ttinclude

使用T4模板生成POCO类插图5

<#@ assembly name="System.Data.Linq"#><#@ assembly name="EnvDTE"#><#@ assembly name="System.Xml"#><#@ assembly name="System.Xml.Linq"#><#@ import namespace="System.Collections.Generic"#><#@ import namespace="System.IO"#><#@ import namespace="System.Text"#><#@ import namespace="Microsoft.VisualStudio.TextTemplating"#><#+// https://raw.github.com/damieng/DamienGKit// http://damieng.com/blog/2009/11/06/multiple-outputs-from-t4-made-easy-revisited// Manager class records the various blocks so it can split them upclass Manager {    private class Block {        public String Name;        public int Start, Length;        public bool IncludeInDefault;    }    private Block currentBlock;    private readonly List<Block> files = new List<Block>();    private readonly Block footer = new Block();    private readonly Block header = new Block();    private readonly ITextTemplatingEngineHost host;    private readonly StringBuilder template;    protected readonly List<String> generatedFileNames = new List<String>();    public static Manager Create(ITextTemplatingEngineHost host, StringBuilder template) {        return (host is IServiceProvider) ? new VSManager(host, template) : new Manager(host, template);    }    public void StartNewFile(String name) {        if (name == null)            throw new ArgumentNullException("name");        CurrentBlock = new Block { Name = name };    }    public void StartFooter(bool includeInDefault = true) {        CurrentBlock = footer;        footer.IncludeInDefault = includeInDefault;    }    public void StartHeader(bool includeInDefault = true) {        CurrentBlock = header;        header.IncludeInDefault = includeInDefault;    }    public void EndBlock() {        if (CurrentBlock == null)            return;        CurrentBlock.Length = template.Length - CurrentBlock.Start;        if (CurrentBlock != header && CurrentBlock != footer)            files.Add(CurrentBlock);        currentBlock = null;    }    public virtual void Process(bool split, bool sync = true) {        if (split) {            EndBlock();            String headerText = template.ToString(header.Start, header.Length);            String footerText = template.ToString(footer.Start, footer.Length);            String outputPath = Path.GetDirectoryName("host.TemplateFile");            files.Reverse();            if (!footer.IncludeInDefault)                template.Remove(footer.Start, footer.Length);            foreach(Block block in files) {                String fileName = Path.Combine(outputPath, block.Name);                String content = headerText + template.ToString(block.Start, block.Length) + footerText;                generatedFileNames.Add(fileName);                CreateFile(fileName, content);                template.Remove(block.Start, block.Length);            }            if (!header.IncludeInDefault)                template.Remove(header.Start, header.Length);        }    }    protected virtual void CreateFile(String fileName, String content) {        if (IsFileContentDifferent(fileName, content))            File.WriteAllText(fileName, content);    }    public virtual String GetCustomToolNamespace(String fileName) {        return null;    }    public virtual String DefaultProjectNamespace {        get { return null; }    }    protected bool IsFileContentDifferent(String fileName, String newContent) {        return !(File.Exists(fileName) && File.ReadAllText(fileName) == newContent);    }    private Manager(ITextTemplatingEngineHost host, StringBuilder template) {        this.host = host;        this.template = template;    }    private Block CurrentBlock {        get { return currentBlock; }        set {            if (CurrentBlock != null)                EndBlock();            if (value != null)                value.Start = template.Length;            currentBlock = value;        }    }    private class VSManager: Manager {        private readonly EnvDTE.ProjectItem templateProjectItem;        private readonly EnvDTE.DTE dte;        private readonly Action<String> checkOutAction;        private readonly Action<List<String>> projectSyncAction;        public override String DefaultProjectNamespace {            get {                return templateProjectItem.ContainingProject.Properties.Item("DefaultNamespace").Value.ToString();            }        }        public override String GetCustomToolNamespace(string fileName) {            return dte.Solution.FindProjectItem(fileName).Properties.Item("CustomToolNamespace").Value.ToString();        }        public override void Process(bool split, bool sync) {            if (templateProjectItem.ProjectItems == null)                return;            base.Process(split, sync);            if (sync)                projectSyncAction.EndInvoke(projectSyncAction.BeginInvoke(generatedFileNames, null, null));        }        protected override void CreateFile(String fileName, String content) {            if (IsFileContentDifferent(fileName, content)) {                CheckoutFileIfRequired(fileName);                File.WriteAllText(fileName, content);            }        }        internal VSManager(ITextTemplatingEngineHost host, StringBuilder template)            : base(host, template) {            var hostServiceProvider = (IServiceProvider)host;            if (hostServiceProvider == null)                throw new ArgumentNullException("Could not obtain IServiceProvider");            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);            checkOutAction = fileName => dte.SourceControl.CheckOutItem(fileName);            projectSyncAction = keepFileNames => ProjectSync(templateProjectItem, keepFileNames);        }        private static void ProjectSync(EnvDTE.ProjectItem templateProjectItem, List<String> keepFileNames) {            var keepFileNameSet = new HashSet<String>(keepFileNames);            var projectFiles = new Dictionary<String, EnvDTE.ProjectItem>();            var originalFilePrefix = Path.GetFileNameWithoutExtension(templateProjectItem.FileNames[0]) + ".";            foreach (EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems)                projectFiles.Add(projectItem.FileNames[0], projectItem);            // Remove unused items from the project            foreach (var pair in projectFiles)                if (!keepFileNames.Contains(pair.Key) && !(Path.GetFileNameWithoutExtension(pair.Key) + ".").StartsWith(originalFilePrefix))                    pair.Value.Delete();            // Add missing files to the project            foreach(String fileName in keepFileNameSet)                if (!projectFiles.ContainsKey(fileName))                    templateProjectItem.ProjectItems.AddFromFile(fileName);        }        private void CheckoutFileIfRequired(String fileName) {            var sc = dte.SourceControl;            if (sc != null && sc.IsItemUnderSCC(fileName) && !sc.IsItemCheckedOut(fileName))                checkOutAction.EndInvoke(checkOutAction.BeginInvoke(fileName, null, null));        }    }} #>

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上面的代码是用来生成多文件的。

3、新建T4模板文件PocoManager.tt,然后引入上面两个ttinclude文件。

使用T4模板生成POCO类插图7

<#@ template debug="false" hostspecific="true" language="C#" #><#@ assembly name="System.Data" #><#@ assembly name="System.Data.DataSetExtensions.dll" #><#@ assembly name="System.xml" #><#@ import namespace="System" #><#@ import namespace="System.Xml" #><#@ import namespace="System.Collections.Generic" #><#@ import namespace="System.Data" #><#@ import namespace="System.Data.SqlClient" #><#@ import namespace="System.IO" #><#@ assembly name="System.Core" #><#@ import namespace="System.Linq" #><#@include file="$(ProjectDir)Models\DbHelper.ttinclude"#> <#@include file="$(ProjectDir)Models\Manager.ttinclude"#> <# var manager = Manager.Create(Host, GenerationEnvironment); #><# manager.StartHeader(); #>using System;using System.Collections.Generic;namespace My.Model{   <# manager.EndBlock(); #><#            foreach (DbTable db in DbHelper.GetDbTables(config.ConnectionString, config.DbDatabase))    {            string tb_name=db.TableName;        manager.StartNewFile(tb_name+".cs");#>    /// <summary>    /// 实体-<#=tb_name#>     /// </summary>   public partial class <#=tb_name#>    {        <# foreach(DbColumn column in DbHelper.GetDbColumns(config.ConnectionString, config.DbDatabase, tb_name)){#>/// <summary>        /// <#=column.Remark#>        /// </summary>                public <#= column.CSharpType#><# if(column.CommonType.IsValueType && column.IsNullable){#>?<#}#> <#=column.ColumnName#> { get; set; }<#}#>       }<#//manager.EndBlock();        }                //conn.Close();  #><# manager.StartFooter(); #>}<# manager.EndBlock(); #><# manager.Process(true); #><#+    public class config    {        public static readonly string ConnectionString="Data Source=(local);Integrated Security=true;Initial Catalog=CarSYS;";        public static readonly string DbDatabase="CarSYS";    }#>

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按Ctrl+S生成的代码如下:

使用T4模板生成POCO类插图9

  using System;using System.Collections.Generic;namespace My.Model{       /// <summary>    /// 实体-Brand     /// </summary>   public partial class Brand    {        /// <summary>        /// 编号        /// </summary>                public int BrandId { get; set; }        /// <summary>        ///         /// </summary>                public string BrandName { get; set; }               }    /// <summary>    /// 实体-Car     /// </summary>   public partial class Car    {        /// <summary>        /// 编号        /// </summary>                public int CarId { get; set; }        /// <summary>        /// 车名称        /// </summary>                public string CarName { get; set; }        /// <summary>        /// 品牌编号        /// </summary>                public int? BrandId { get; set; }        /// <summary>        /// 实体图的文件名        /// </summary>                public string Picture { get; set; }        /// <summary>        /// 官方价        /// </summary>                public decimal OfficialPrice { get; set; }        /// <summary>        /// 点击率        /// </summary>                public int? Click { get; set; }               }    /// <summary>    /// 实体-Product     /// </summary>   public partial class Product    {        /// <summary>        ///         /// </summary>                public Guid Id { get; set; }        /// <summary>        ///         /// </summary>                public string NAME { get; set; }        /// <summary>        ///         /// </summary>                public decimal Price { get; set; }               }}

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方式二

操作方式一种的步骤2,然后新建T4模板Manager.tt,引入Manager.ttinclude

使用T4模板生成POCO类插图11

<#@ template debug="false" hostspecific="true" language="C#" #><#@ assembly name="System.Data" #><#@ assembly name="System.xml" #><#@ import namespace="System.Collections.Generic" #><#@ import namespace="System.Data.SqlClient" #><#@ import namespace="System.Data" #><#@ assembly name="System.Core" #><#@ import namespace="System.Linq" #><#@include file="$(ProjectDir)Models\Manager.ttinclude"#> <# var manager = Manager.Create(Host, GenerationEnvironment); #><# manager.StartHeader(); #>using System;using System.Collections.Generic;namespace My.Model{   <# manager.EndBlock(); #><#            string connectionString= "server=localhost;database=CarSYS;uid=sa;pwd=1127;";            SqlConnection conn = new SqlConnection(connectionString);    conn.Open();        string selectQuery ="SET FMTONLY ON; select * from @tableName; SET FMTONLY OFF;";    SqlCommand command = new SqlCommand(selectQuery,conn);    SqlDataAdapter ad = new SqlDataAdapter(command);    System.Data.DataSet ds = new DataSet();     System.Data.DataTable schema = conn.GetSchema("Tables");    foreach(System.Data.DataRow row in schema.Rows)    {            ds.Tables.Clear();        string tb_name =row["TABLE_NAME"].ToString().Replace(" ","_");         string tb_type=row["TABLE_TYPE"].ToString();        if(tb_type!="BASE TABLE")        {                  continue;        }         command.CommandText = selectQuery.Replace("@tableName","["+row["TABLE_NAME"].ToString()+"]");        ad.FillSchema(ds,SchemaType.Mapped,tb_name);          manager.StartNewFile(tb_name+".cs");#>    /// <summary>    /// 实体-<#=tb_name#>     /// </summary>    public partial class <#=tb_name#>        {            <#        //PushIndent("        ");        foreach (DataColumn dc in ds.Tables[0].Columns)         {            string dataTypeName=dc.DataType.Name=="Byte[]"?"DateTime":dc.DataType.Name;        #>        /// <summary>        /// <#=dc#>        /// </summary>        <#             WriteLine("public " + dataTypeName + (dc.AllowDBNull && dataTypeName.ToLower() != "string" ? "? ": " ") + dc.ColumnName + " { get; set; }");        }        PopIndent();        #>    } <#        manager.EndBlock();        }                conn.Close();  #><# manager.StartFooter(); #>}<# manager.EndBlock(); #><# manager.Process(true); #>

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按Ctrl+S生成的代码如下:

使用T4模板生成POCO类插图13

 using System;using System.Collections.Generic;namespace My.Model{       /// <summary>    /// 实体-Brand     /// </summary>    public partial class Brand        {                    /// <summary>        /// BrandId        /// </summary>        public Int32 BrandId { get; set; }        /// <summary>        /// BrandName        /// </summary>        public String BrandName { get; set; }    }     /// <summary>    /// 实体-Car     /// </summary>    public partial class Car        {                    /// <summary>        /// CarId        /// </summary>        public Int32 CarId { get; set; }        /// <summary>        /// CarName        /// </summary>        public String CarName { get; set; }        /// <summary>        /// BrandId        /// </summary>        public Int32? BrandId { get; set; }        /// <summary>        /// Picture        /// </summary>        public String Picture { get; set; }        /// <summary>        /// OfficialPrice        /// </summary>        public Decimal OfficialPrice { get; set; }        /// <summary>        /// Click        /// </summary>        public Int32? Click { get; set; }    }     /// <summary>    /// 实体-Product     /// </summary>    public partial class Product        {                    /// <summary>        /// Id        /// </summary>        public Guid Id { get; set; }        /// <summary>        /// NAME        /// </summary>        public String NAME { get; set; }        /// <summary>        /// Price        /// </summary>        public Decimal Price { get; set; }    } }

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数据库CarSYS的脚本下载地址:

使用T4模板生成POCO类插图15

USE [master]GO/****** Object:  Database [CarSYS]    Script Date: 2/17/2017 5:33:04 PM ******/CREATE DATABASE [CarSYS] CONTAINMENT = NONE ON  PRIMARY ( NAME = N'CarSYS', FILENAME = N'F:\DatabaseFile\CarSYS.mdf' , SIZE = 212992KB , MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB ) LOG ON ( NAME = N'CarSYS_log', FILENAME = N'F:\DatabaseFile\CarSYS_log.ldf' , SIZE = 321088KB , MAXSIZE = 2048GB , FILEGROWTH = 10%)GOALTER DATABASE [CarSYS] SET COMPATIBILITY_LEVEL = 110GOIF (1 = FULLTEXTSERVICEPROPERTY('IsFullTextInstalled'))beginEXEC [CarSYS].[dbo].[sp_fulltext_database] @action = 'enable'endGOALTER DATABASE [CarSYS] SET ANSI_NULL_DEFAULT OFF GOALTER DATABASE [CarSYS] SET ANSI_NULLS OFF GOALTER DATABASE [CarSYS] SET ANSI_PADDING OFF GOALTER DATABASE [CarSYS] SET ANSI_WARNINGS OFF GOALTER DATABASE [CarSYS] SET ARITHABORT OFF GOALTER DATABASE [CarSYS] SET AUTO_CLOSE OFF GOALTER DATABASE [CarSYS] SET AUTO_CREATE_STATISTICS ON GOALTER DATABASE [CarSYS] SET AUTO_SHRINK OFF GOALTER DATABASE [CarSYS] SET AUTO_UPDATE_STATISTICS ON GOALTER DATABASE [CarSYS] SET CURSOR_CLOSE_ON_COMMIT OFF GOALTER DATABASE [CarSYS] SET CURSOR_DEFAULT  GLOBAL GOALTER DATABASE [CarSYS] SET CONCAT_NULL_YIELDS_NULL OFF GOALTER DATABASE [CarSYS] SET NUMERIC_ROUNDABORT OFF GOALTER DATABASE [CarSYS] SET QUOTED_IDENTIFIER OFF GOALTER DATABASE [CarSYS] SET RECURSIVE_TRIGGERS OFF GOALTER DATABASE [CarSYS] SET  DISABLE_BROKER GOALTER DATABASE [CarSYS] SET AUTO_UPDATE_STATISTICS_ASYNC OFF GOALTER DATABASE [CarSYS] SET DATE_CORRELATION_OPTIMIZATION OFF GOALTER DATABASE [CarSYS] SET TRUSTWORTHY OFF GOALTER DATABASE [CarSYS] SET ALLOW_SNAPSHOT_ISOLATION OFF GOALTER DATABASE [CarSYS] SET PARAMETERIZATION SIMPLE GOALTER DATABASE [CarSYS] SET READ_COMMITTED_SNAPSHOT OFF GOALTER DATABASE [CarSYS] SET HONOR_BROKER_PRIORITY OFF GOALTER DATABASE [CarSYS] SET RECOVERY FULL GOALTER DATABASE [CarSYS] SET  MULTI_USER GOALTER DATABASE [CarSYS] SET PAGE_VERIFY CHECKSUM  GOALTER DATABASE [CarSYS] SET DB_CHAINING OFF GOALTER DATABASE [CarSYS] SET FILESTREAM( NON_TRANSACTED_ACCESS = OFF ) GOALTER DATABASE [CarSYS] SET TARGET_RECOVERY_TIME = 0 SECONDS GOALTER DATABASE [CarSYS] SET  READ_WRITE GO

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扩展:我们还可以在搭建项目框架的时候,通过反射等技术来自己编写T4模板。

当然,我们还可以通过Entity Framework Power Tools这个开发神器来生成我们的EF Code代码。

文章转载于:https://www.cnblogs.com/jiekzou/p/6410719.html

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