Sample T4 template code

This template generates multiple respository files based on the edmx file of the EF framework.

<#@ template language="C#" debug="true" hostspecific="true"#><#@ include file="EF.Utility.CS.ttinclude"#><#@ import namespace="System.IO" #><#@ import namespace="System.Diagnostics" #><#@ output extension=".cs"#><#// This needs to be set to the .edmx file that you want to process.//string edmxFile = FindEDMXFileName(); // @"Model1.edmx";string edmxFile = @"Model.edmx";CodeGenerationTools code = new CodeGenerationTools(this);MetadataLoader loader = new MetadataLoader(this);MetadataTools ef = new MetadataTools(this);#>using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Linq.Expressions; namespace <#= code.VsNamespaceSuggestion() #>{ public interface IRepository<T>     {IUnitOfWork UnitOfWork { get; set; }bool IsUseDataFilter{get;set;}IQueryable<T> All();IQueryable<T> Find(Expression<Func<T, bool>> expression);IQueryable<T> Find(string where , params object[] para);IQueryable<T> Sort(IQueryable<T> source, string sortfield);void Add(T entity);void Delete(T entity);void Save();void Update(T entity);    }}<#EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(edmxFile);EntityContainer container = ItemCollection.GetItems<EntityContainer>().FirstOrDefault();EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)){;    fileManager.StartNewFile(entity.Name + "Repository.Generated.cs"); #>using System;using System.Linq;using System.Collections.Generic;// This file is auto generated and will be overwritten as soon as the template is executed// Do not modify this file...namespace <#= code.VsNamespaceSuggestion() #>{   <#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#>Repository{private IRepository<<#=code.Escape(entity)#>> _repository {get;set;}private bool _isUseDataFilter;public IRepository<<#=code.Escape(entity)#>> Repository{get { return _repository; }set { _repository = value; }}public <#=code.Escape(entity)#>Repository(IRepository<<#=code.Escape(entity)#>> repository, IUnitOfWork unitOfWork)    {    Repository = repository;Repository.UnitOfWork = unitOfWork;IsUseDataFilter = true;    }public IQueryable<<#=code.Escape(entity)#>> All(){return Repository.All();}public void Add(<#=code.Escape(entity)#> entity){throw new NotImplementedException("This repository does not support the method.");}public void Delete(<#=code.Escape(entity)#> entity){throw new NotImplementedException("This repository does not support the method.");}public void Save(){throw new NotImplementedException("This repository does not support the method.");}public bool IsUseDataFilter        {            get            {                return _isUseDataFilter;            }            set            {                _isUseDataFilter = value;this.Repository.IsUseDataFilter = value;            }        }}}<#if(!DoesFileExist(entity.Name + "Repository.cs")){fileManager.StartNewFile(entity.Name + "Repository.cs");#>using System;using System.Linq;using System.Collections.Generic;namespace <#= code.VsNamespaceSuggestion() #>{   <#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#>Repository{// Add your own data access methods.// This file should not get overridden}}<#}else{fileManager.StartNewFile(entity.Name + "Repository.cs");this.Write(OutputFile(entity.Name + "Repository.cs"));}}fileManager.StartNewFile("IUnitOfWork.cs");#>using System.Data.Objects;namespace <#= code.VsNamespaceSuggestion() #>{public interface IUnitOfWork{ObjectContext Context { get; set; }void Save();bool LazyLoadingEnabled { get; set; }bool ProxyCreationEnabled { get; set; }string ConnectionString { get; set; }}}<#fileManager.StartNewFile("RepositoryIQueryableExtensions.cs");#>using System.Data.Objects;using System.Linq;namespace <#= code.VsNamespaceSuggestion() #>{public static class RepositoryIQueryableExtensions{public static IQueryable<T> Include<T>(this IQueryable<T> source, string path){var objectQuery = source as ObjectQuery<T>;if (objectQuery != null){return objectQuery.Include(path);}return source;}}}<# fileManager.StartNewFile("EFRepository.cs");#>using System;using System.Collections.Generic;using System.Data.Objects;using System.Linq;using System.Text;using System.Linq.Dynamic;using System.Linq.Expressions;using SCM.SCMEntity;namespace <#= code.VsNamespaceSuggestion() #>{public class EFRepository<T> : IRepository<T> where T : class{public IUnitOfWork UnitOfWork { get; set; }public bool IsUseDataFilter { get; set; }private IObjectSet<T> _objectset;private IObjectSet<T> ObjectSet{get{if (_objectset == null){_objectset = UnitOfWork.Context.CreateObjectSet<T>();}return _objectset;}}        public virtual void Update(T entity)        {                        UnitOfWork.Context.ApplyCurrentValues<T>(typeof(T).Name,entity);            UnitOfWork.Save();        }public virtual IQueryable<T> All(){IQueryable<T> iq = ObjectSet.AsQueryable(); ;            ApplyDataFilter(ref iq);                        return iq;}public IQueryable<T> Find(string where , params object[] paras)        {            IQueryable<T> iq =ObjectSet.Where(where , paras).AsQueryable();            ApplyDataFilter(ref iq);return iq;        }public IQueryable<T> Find(Expression<Func<T, bool>> expression){IQueryable<T> iq = ObjectSet.Where<T>(expression).AsQueryable();            ApplyDataFilter(ref iq);return iq;}public IQueryable<T> Sort(IQueryable<T> source,string sortfield)        {            return source.OrderBy(sortfield);        }public void Add(T entity){ObjectSet.AddObject(entity);}public void Delete(T entity){ObjectSet.DeleteObject(entity);}public void Save(){UnitOfWork.Save();}        private void ApplyDataFilter(ref IQueryable<T> iq)        {            if (IsUseDataFilter==null||!IsUseDataFilter)                return;            var context = new SCM.SCMEntity.SCMEntity();            IObjectSet<sysDataFilter> _df = context.CreateObjectSet<sysDataFilter>();            if (System.Web.HttpContext.Current == null)                return;                        if (System.Web.HttpContext.Current.Session["userid"] == null)                return;            string userid=System.Web.HttpContext.Current.Session["userid"].ToString();            List<sysDataFilter> dfs =_df.Where<sysDataFilter>(p=>p.UserID==userid&&p.TableID==typeof(T).Name).AsQueryable<sysDataFilter>().ToList();;            var totalexp = iq.Expression;                        if (dfs == null)                return;                        if (dfs.Count > 0)            {                var para = Expression.Parameter(typeof(T), "p");                foreach (sysDataFilter df in dfs)                {                    var bin = Expression.Property(para, df.FieldName);                                        Type t=bin.Type;                    #region Calculate expression                    switch (df.FOperator)                    {                        case "=":                                                        var con1 = Expression.Constant(df.FParameter,bin.Type);                            var bin1 = Expression.Equal(bin, con1);                            var ex1 = Expression.Lambda<Func<T, bool>>(bin1, para);try{switch(df.AndOr.ToLower()){case "and":totalexp = Expression.And(bin1, totalexp);break;case "or":totalexp = Expression.Or(bin1,totalexp);break;default:totalexp=bin1;break;}}catch { totalexp = bin1;}                            break;                        case ">":                                                        var con2 = Expression.Constant(df.FParameter, bin.Type);                            var bin2 = Expression.GreaterThan(bin, con2);                            var ex2 = Expression.Lambda<Func<T, bool>>(bin2, para);try{switch (df.AndOr.ToLower()){case "and":totalexp = Expression.And(bin2, totalexp);break;case "or":totalexp = Expression.Or(bin2, totalexp);break;default:totalexp = bin2;break;}                            }catch { totalexp = bin2;}                            //iq = iq.Where<T>(ex2).AsQueryable();                            break;                        case "<":                                                        var con3 = Expression.Constant(df.FParameter, bin.Type);                            var bin3 = Expression.LessThan(bin, con3);                            var ex3 = Expression.Lambda<Func<T, bool>>(bin3, para);try{                            switch (df.AndOr.ToLower())                            {                                case "and":                                    totalexp = Expression.And(bin3, totalexp);                                    break;                                case "or":                                    totalexp = Expression.Or(bin3, totalexp);                                    break;                                default:                                    totalexp = bin3;                                    break;                            }                            }catch { totalexp = bin3;}                            //iq = iq.Where<T>(ex3).AsQueryable();                              break;                              case "<>":                              var con6 = Expression.Constant(df.FParameter, bin.Type);                              var bin6 = Expression.LessThan(bin, con6);                              var ex6 = Expression.Lambda<Func<T, bool>>(bin6, para);                                try{                                switch (df.AndOr.ToLower())                                {                                case "and":                                totalexp = Expression.And(bin6, totalexp);                                break;                                case "or":                                totalexp = Expression.Or(bin6, totalexp);                                break;                                default:                                totalexp = bin6;                                break;                                }                                }catch { totalexp = bin6;}                                //iq = iq.Where<T>(ex6).AsQueryable();                                  break;                                  case "StartWith":                                  var con4 = Expression.Constant(df.FParameter);                                  var bin4 = Expression.LessThan(bin, con4);                                  var ex4 = Expression.Lambda<Func<T, bool>>(bin4, para);try{                            switch (df.AndOr.ToLower())                            {                                case "and":                                    totalexp = Expression.And(bin4, totalexp);                                    break;                                case "or":                                    totalexp = Expression.Or(bin4, totalexp);                                    break;                                default:                                    totalexp = bin4;                                    break;                            }                            }catch { totalexp = bin4;}                            //iq = iq.Where<T>(ex4).AsQueryable();                            break;                        case "EndWith":                            var con5 = Expression.Constant(df.FParameter);                            var bin5 = Expression.LessThan(bin, con5);                            var ex5 = Expression.Lambda<Func<T, bool>>(bin5, para);try{                            switch (df.AndOr.ToLower())                            {                                case "and":                                    totalexp = Expression.And(bin5, totalexp);                                    break;                                case "or":                                    totalexp = Expression.Or(bin5, totalexp);                                    break;                                default:                                    totalexp = bin5;                                    break;                            }}catch { totalexp = bin5;}                            break;                    }                    #endregion                }                var exfinal = Expression.Lambda<Func<T, bool>>(totalexp, para);                                iq = iq.Where<T>(exfinal).AsQueryable();            }        }}}<#fileManager.StartNewFile("EFUnitOfWork.cs");#>using System.Data.Objects;namespace <#= code.VsNamespaceSuggestion() #>{public class EFUnitOfWork : IUnitOfWork{public ObjectContext Context { get; set; }public EFUnitOfWork(){Context = new <#=code.Escape(container)#>();Context.CommandTimeout=1800;}public EFUnitOfWork(int count){Context = new <#=code.Escape(container)#>();            Context.CommandTimeout = count;}public void Save(){Context.SaveChanges();}public bool LazyLoadingEnabled{get { return Context.ContextOptions.LazyLoadingEnabled; }set { Context.ContextOptions.LazyLoadingEnabled = value;}}public bool ProxyCreationEnabled{get { return Context.ContextOptions.ProxyCreationEnabled; }set { Context.ContextOptions.ProxyCreationEnabled = value; }}public string ConnectionString{get { return Context.Connection.ConnectionString; }set { Context.Connection.ConnectionString = value; }}}}<#fileManager.Process();#><#+bool DoesFileExist(string filename){return File.Exists(Path.Combine(GetCurrentDirectory(),filename));}string OutputFile(string filename){using(StreamReader sr = new StreamReader(Path.Combine(GetCurrentDirectory(),filename))){string contents = sr.ReadToEnd();return contents;}}string GetCurrentDirectory(){string executingDirectoryName = "";string stackTraceFileName = new StackTrace(true).GetFrame(0).GetFileName();if (String.IsNullOrEmpty(stackTraceFileName)){throw new ArgumentException("No value was specified for the ‘directoryName‘ configuration parameter" +", and we could not figure out the file name from the stack trace (most likely because of running " +"the template with debug=‘False‘ specified in the <\[email protected] template \u0023> directive.");}else{executingDirectoryName = Path.GetDirectoryName(stackTraceFileName);}return executingDirectoryName;}string FindEDMXFileName(){string edmxFile = "";string[] entityFrameworkFiles = Directory.GetFiles(GetCurrentDirectory(), "*.edmx");if(entityFrameworkFiles.Length > 0)edmxFile = entityFrameworkFiles[0];return edmxFile;}#>

　　

Sample T4 template code