MVC ---- T4模板的小练习

1、先建立两个模板文件 ：Manger.ttinclude、DBHelper.ttinclude

Manger.ttinclude

<#@ assembly name="System.Core"#>  
<#@ assembly name="System.Data.Linq"#>  
<#@ assembly name="EnvDTE"#>  
<#@ assembly name="System.Xml"#>  
<#@ assembly name="System.Xml.Linq"#>  
<#@ import namespace="System"#>  
<#@ import namespace="System.CodeDom"#>  
<#@ import namespace="System.CodeDom.Compiler"#>  
<#@ import namespace="System.Collections.Generic"#>  
<#@ import namespace="System.Data.Linq"#>  
<#@ import namespace="System.Data.Linq.Mapping"#>  
<#@ import namespace="System.IO"#>  
<#@ import namespace="System.Linq"#>  
<#@ import namespace="System.Reflection"#>  
<#@ import namespace="System.Text"#>  
<#@ import namespace="System.Xml.Linq"#>  
<#@ import namespace="Microsoft.VisualStudio.TextTemplating"#>  
<#+  
   
// Manager class records the various blocks so it can split them up  
class Manager {  
    private class Block {  
        public String Name;  
        public int Start, Length;  
    }  
   
    private Block currentBlock;  
    private List<Block> files = new List<Block>();  
    private Block footer = new Block();  
    private Block header = new Block();  
    private ITextTemplatingEngineHost host;  
    private StringBuilder template;  
    protected 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() {  
        CurrentBlock = footer;  
    }  
   
    public void StartHeader() {  
        CurrentBlock = header;  
    }  
   
    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) {  
        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();  
            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);  
            }  
        }  
    }  
   
    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 EnvDTE.ProjectItem templateProjectItem;  
        private EnvDTE.DTE dte;  
        private Action<String> checkOutAction;  
        private Action<IEnumerable<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) {  
            if (templateProjectItem.ProjectItems == null)  
                return;  
            base.Process(split);  
            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 = (String fileName) => dte.SourceControl.CheckOutItem(fileName);  
            projectSyncAction = (IEnumerable<String> keepFileNames) => ProjectSync(templateProjectItem, keepFileNames);  
        }  
   
        private static void ProjectSync(EnvDTE.ProjectItem templateProjectItem, IEnumerable<String> keepFileNames) {  
            var keepFileNameSet = new HashSet<String>(keepFileNames);  
            var projectFiles = new Dictionary<String, EnvDTE.ProjectItem>();  
            var originalFilePrefix = Path.GetFileNameWithoutExtension(templateProjectItem.get_FileNames(0)) + ".";  
            foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems)  
                projectFiles.Add(projectItem.get_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));  
        }  
    }  
} #>

DBHelper.ttinclude
<#+
    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
    

#>

使用类，如果出现重复引用的，那就删掉重复的

TextTemplate1.tt

<#@ template debug="false" hostspecific="true" language="C#" #>

<#@ assembly name="System.Configuration.dll" #>
<#@ import namespace="System.Text" #>
 

<#@ assembly name="System.Data.dll" #>
<#@ 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" #>

<#@ assembly name="System.Core"#>  
<#@ assembly name="System.Data.Linq"#>  
<#@ assembly name="EnvDTE"#>  
<#@ assembly name="System.Xml"#>  
<#@ assembly name="System.Xml.Linq"#>  
<#@ import namespace="System"#>  
<#@ import namespace="System.CodeDom"#>  
<#@ import namespace="System.CodeDom.Compiler"#>  
<#@ import namespace="System.Collections.Generic"#>  
<#@ import namespace="System.Data.Linq"#>  
<#@ import namespace="System.Data.Linq.Mapping"#>  
<#@ import namespace="System.IO"#>  
<#@ import namespace="System.Linq"#>  
<#@ import namespace="System.Reflection"#>  
<#@ import namespace="System.Text"#>  
<#@ import namespace="System.Xml.Linq"#>  
<#@ import namespace="Microsoft.VisualStudio.TextTemplating"#>  
<#@ output extension=".txt" encoding="utf-8" #>

<#@ include file="$(ProjectDir)CommManger.ttinclude" #>
<#@ include file="$(ProjectDir)CommDbHelper.ttinclude"  #>

<# 
    for (int i = 0; i < 10; i++)
    {
        Write(i.ToString());
#>
        i.ToString()<#= i+3 #>
 <# 
    }

 #>