using System.Web.Mvc;
using System.CodeDom.Compiler;
using System.Text;
using Microsoft.CSharp;

namespace DynamicCompiler.Controllers
{
  public class HomeController : Controller
  {
    // GET: Home
    public ContentResult Index()
    {
      return Content(@"
              這個頁面是vs生成的<br> 
              <a href='/home/creat'>點擊動態(tài)編譯生成TestController</a><br>
              <a href='/Test/'>訪問TestController</a><br>
              <a href='/Test/WithView'>測試帶View的Action</a>
            ");
    }

    public ContentResult Creat()
    {
      string cspath = Server.MapPath("~/TestController.cs");
      var compiler = CompilerFromCsPath("TestController", cspath); //編譯

      #region 輸出編譯信息
      StringBuilder sb = new StringBuilder();
      sb.Append("cs文件路徑：" + cspath);

      sb.Append("編譯信息：" + "<br>");
      foreach (string output in compiler.Output)
      {
        sb.Append(output + "<br>");
      }
      sb.Append("錯誤信息：" + "<br>");
      foreach (CompilerError error in compiler.Errors)
      {
        sb.Append(error.ErrorText + "<br>");
      }
      #endregion

      return Content(sb.ToString());
    }

    /// <summary>
    /// 動態(tài)編譯并執(zhí)行代碼
    /// </summary>
    /// <param name="csPath">代碼</param>
    /// <param name="dllName">輸出dll的路徑</param>
    /// <returns>返回輸出內(nèi)容</returns>
    private CompilerResults CompilerFromCsPath(string dllName, params string[] csPath)
    {
      string binpath = Server.MapPath("~/bin/");
      CSharpCodeProvider complier = new CSharpCodeProvider();
      //設置編譯參數(shù)
      CompilerParameters paras = new CompilerParameters();
      //引入第三方dll
      paras.ReferencedAssemblies.Add("System.dll");
      paras.ReferencedAssemblies.Add("System.linq.dll");
      paras.ReferencedAssemblies.Add("System.Web.dll");
      paras.ReferencedAssemblies.Add(binpath + "System.Web.Mvc.dll");
      //是否內(nèi)存中生成輸出
      paras.GenerateInMemory = false;
      //是否生成可執(zhí)行文件
      paras.GenerateExecutable = false;
      paras.OutputAssembly = binpath + dllName + ".dll";
      //編譯代碼
      CompilerResults result = complier.CompileAssemblyFromFile(paras, csPath);
      return result;
    }
  }
}