using Microsoft.VisualStudio.TextTemplating;
using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CodeGenerate.EngineHost
{
 public class TextTemplatingEngineHost : ITextTemplatingEngineHost, ITextTemplatingSessionHost
 {
 public List<string> LocalDlls { get; set; }
 public List<string> Namespaces { get; set; }
 /// <summary>
 /// 模板文件
 /// </summary>
 public string TemplateFile { get; set; }
 /// <summary>
 /// 文件擴(kuò)展名
 /// </summary>
 public string FileExtension { get; set; }
 /// <summary>
 /// 文件擴(kuò)展名
 /// </summary>
 public Encoding FileEncoding { get; set; }
 /// <summary>
 /// 錯誤信息
 /// </summary>
 public CompilerErrorCollection Errors { get; set; }
 public IList<string> StandardAssemblyReferences
 {
  get
  {
  LocalDlls.Add(typeof(System.Uri).Assembly.Location);
  return LocalDlls;
  }
 }
 public IList<string> StandardImports
 {
  get
  {
  Namespaces.Add("System");
  return Namespaces;
  }
 }
 /// <summary>
 /// 參數(shù)傳遞
 /// </summary>
 public ITextTemplatingSession Session { get; set; }

 public bool LoadIncludeText(string requestFileName, out string content, out string location)
 {
  content = System.String.Empty;
  location = System.String.Empty;
  if (File.Exists(requestFileName))
  {
  content = File.ReadAllText(requestFileName);
  return true;
  }
  else
  {
  return false;
  }
 }
 public object GetHostOption(string optionName)
 {
  object returnObject;
  switch (optionName)
  {
  case "CacheAssemblies":
   returnObject = true;
   break;
  default:
   returnObject = null;
   break;
  }
  return returnObject;
 }
 public string ResolveAssemblyReference(string assemblyReference)
 {
  if (File.Exists(assemblyReference))
  {
  return assemblyReference;
  }
  string candidate = Path.Combine(Path.GetDirectoryName(this.TemplateFile), assemblyReference);
  if (File.Exists(candidate))
  {
  return candidate;
  }
  return "";
 }
 public Type ResolveDirectiveProcessor(string processorName)
 {
  if (string.Compare(processorName, "XYZ", StringComparison.OrdinalIgnoreCase) == 0)
  {
  //return typeof(); 
  }
  throw new Exception("Directive Processor not found");
 }
 public string ResolvePath(string fileName)
 {
  if (fileName == null)
  {
  throw new ArgumentNullException("the file name cannot be null");
  }
  if (File.Exists(fileName))
  {
  return fileName;
  }
  string candidate = Path.Combine(Path.GetDirectoryName(this.TemplateFile), fileName);
  if (File.Exists(candidate))
  {
  return candidate;
  }
  return fileName;
 }
 public string ResolveParameterValue(string directiveId, string processorName, string parameterName)
 {
  if (directiveId == null)
  {
  throw new ArgumentNullException("the directiveId cannot be null");
  }
  if (processorName == null)
  {
  throw new ArgumentNullException("the processorName cannot be null");
  }
  if (parameterName == null)
  {
  throw new ArgumentNullException("the parameterName cannot be null");
  }
  return String.Empty;
 }
 public void SetFileExtension(string extension)
 {
  FileExtension = extension;
 }
 public void SetOutputEncoding(System.Text.Encoding encoding, bool fromOutputDirective)
 {
  FileEncoding = encoding;
 }
 public void LogErrors(CompilerErrorCollection errors)
 {
  Errors = errors;
 }
 public AppDomain ProvideTemplatingAppDomain(string content)
 {
  return AppDomain.CreateDomain("Generation App Domain");
 }

 public ITextTemplatingSession CreateSession()
 {
  return this.Session;
 }
 }
}

using Microsoft.VisualStudio.TextTemplating;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.Text;
using System.Threading.Tasks;

namespace CodeGenerate.EngineHost
{
 [Serializable]
 public class TextTemplatingSession : Dictionary<string, Object>, ITextTemplatingSession, ISerializable
 {
  public Guid Id { get;private set; }

  public TextTemplatingSession() : this(Guid.NewGuid())
  {
  }

  public TextTemplatingSession(Guid id)
  {
   this.Id = id;
  }
  public override int GetHashCode()
  {
   return Id.GetHashCode();
  }
  public TextTemplatingSession(SerializationInfo info, StreamingContext context)
   : base(info, context)
  {
   Id = (Guid)info.GetValue("Id", typeof(Guid));
  }

  void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context)
  {
   base.GetObjectData(info, context);
   info.AddValue("Id", Id);
  }

  public override bool Equals(object obj)
  {
   var o = obj as TextTemplatingSession;
   return o != null && o.Equals(this);
  }

  public bool Equals(ITextTemplatingSession other)
  {
   return other != null && other.Id == this.Id;
  }

  public bool Equals(Guid other)
  {
   return other.Equals(Id);
  }
 }
}

string templateFileName = "Template/test.tt";
   TextTemplatingEngineHost host = new TextTemplatingEngineHost();
   Engine engine = new Engine();
   //引入本地dll
   host.LocalDlls = new List<string>() { AppDomain.CurrentDomain.BaseDirectory.ToString() + "Params.dll" };
   //引入命名空間
   host.Namespaces = new List<string>() { "Params" };
   //模板文件
   host.TemplateFile = templateFileName;
   //設(shè)置輸出文件的編碼格式
   host.SetOutputEncoding(System.Text.Encoding.UTF8, false);
   //通過Session將參數(shù)傳遞到模板
   EngineHost.TextTemplatingSession keyValuePairs = new EngineHost.TextTemplatingSession();
   testType t = new testType() { Name = "666666666666" };
   keyValuePairs.Add("test", t);
   host.Session = keyValuePairs;
   //模板
   string input = File.ReadAllText(templateFileName);
   //執(zhí)行代碼生成
   string output = engine.ProcessTemplate(input, host);
   //設(shè)置文件的輸出路徑和文件擴(kuò)展名 ，，根據(jù)模板中的設(shè)置定義
   string outputFileName = string.Concat(
    AppDomain.CurrentDomain.BaseDirectory.ToString(), "Output/",
    Path.GetFileNameWithoutExtension(templateFileName),
    host.FileExtension);
   //將生成的文件寫入到新位置
   File.WriteAllText(outputFileName, output, host.FileEncoding);
   if (host.Errors.HasErrors)
   {
    foreach (CompilerError error in host.Errors)
    {
     MessageBox.Show(error.ToString());
    }
   }

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ assembly name="Params.dll" #>
<#@ import namespace="Params" #>
<#@ parameter type="Params.testType" name="test" #>
<#@ output extension=".cs" #>
<# if(test!=null&&test.Name!=null){#>
<#=test.Name #>
<# } #>

[Serializable]
 public class testType
 {
  public string Name { get; set; }
 }