c#如何在运行时动态创建类型？

public static Assembly NewAssembly()
{
  //创建编译器实例。 
  provider = new CSharpCodeProvider();
  //设置编译参数。 
  cp = new CompilerParameters();
  cp.GenerateExecutable = false;
  cp.GenerateInMemory = true;
 
  // Generate an executable instead of
  // a class library.
  //cp.GenerateExecutable = true;
 
  // Set the assembly file name to generate.
  cp.OutputAssembly = "c:1.dll";
 
  // Generate debug information.
  cp.includeDebugInformation = true;
 
 
  // Save the assembly as a physical file.
  cp.GenerateInMemory = false;
 
  // Set the level at which the compiler
  // should start displaying warnings.
  cp.WarningLevel = 3;
 
  // Set whether to treat all warnings as errors.
  cp.TreatWarningsAsErrors = false;
 
  // Set compiler argument to optimize output.
  cp.CompilerOptions = "/optimize";
 
  cp.ReferencedAssemblies.Add("System.dll");
  //cp.ReferencedAssemblies.Add("System.Core.dll");
  cp.ReferencedAssemblies.Add("System.Data.dll");
  //cp.ReferencedAssemblies.Add("System.Data.DataSetExtensions.dll");
  cp.ReferencedAssemblies.Add("System.Deployment.dll");
  cp.ReferencedAssemblies.Add("System.Design.dll");
  cp.ReferencedAssemblies.Add("System.Drawing.dll");
  cp.ReferencedAssemblies.Add("System.Windows.Forms.dll");
 
  //创建动态代码。 
  
  StringBuilder classSource = new StringBuilder();
  classSource.Append("using System;using System.Windows.Forms;npublic  class  DynamicClass: UserControl n");
  classSource.Append("{n");
  classSource.Append("public DynamicClass()n{nInitializeComponent();nConsole.WriteLine("hello");}n");
  classSource.Append( "private System.ComponentModel.IContainer components = null;nprotected override void Dispose(bool disposing)n{n");
  classSource.Append( "if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);n}n");
  classSource.Append( "private void InitializeComponent(){nthis.SuspendLayout();this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);");
  classSource.Append( "this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.Name = "DynamicClass";this.Size = new System.Drawing.Size(112, 74);this.ResumeLayout(false);n}");
  //创建属性。 
  /*************************在这里改成需要的属性******************************/
  classSource.Append(propertyString("aaa"));
  classSource.Append(propertyString("bbb"));
  classSource.Append(propertyString("ccc"));
 
  classSource.Append("}");
 
  System.Diagnostics.Debug.WriteLine(classSource.ToString());
 
  //编译代码。 
  CompilerResults result = provider.CompileAssemblyFromSource(cp, classSource.ToString());
  if (result.Errors.Count > 0)
  {
 for( int i = 0; i < result.Errors.Count; i ++)
   Console.WriteLine(result.Errors[ i]);
 Console.WriteLine("error");
 return null;
  }
  
  //获取编译后的程序集。 
  Assembly assembly = result.CompiledAssembly;
 
  return assembly;
}
 
private static string propertyString(string propertyName)
{
  StringBuilder sbProperty = new StringBuilder();
  sbProperty.Append(" private  int  _" + propertyName + "  =  0;n");
  sbProperty.Append(" public  int  " + "" + propertyName + "n");
  sbProperty.Append(" {n");
  sbProperty.Append(" get{  return  _" + propertyName + ";}  n");
  sbProperty.Append(" set{  _" + propertyName + "  =  value;  }n");
  sbProperty.Append(" }");
  return sbProperty.ToString();
}