C#如何通过T4自动生成代码详解

通过T4模板生成代码，运行时实现

关键代码段：Host

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>
 /// 文件扩展名
 /// </summary>
 public string FileExtension { get; set; }
 /// <summary>
 /// 文件扩展名
 /// </summary>
 public Encoding FileEncoding { get; set; }
 /// <summary>
 /// 错误信息
 /// </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>
 /// 参数传递
 /// </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;
 }
 }
}								 
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