C#在运行时动态创建类型的实现方法

本文实例讲述了c#在运行时动态创建类型的实现方法。是c#项目开发中很实用的技巧。分享给大家供大家参考。具体分析如下：

具体来说，c# 在运行时动态的创建类型是通过动态生成c#源代码，然后通过编译器编译成程序集的方式实现动态创建类型的。

主要功能代码如下：

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();
}

希望本文所述对大家的c#程序设计有所帮助