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