Question

C# 如何动态创建一个类

这个类由某个基类派生

Answer 1

1. 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。

2. 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();

   }

Answer 2

            dynamic myclass = new { field1 = "abcd", field2 = 12 };

派生自其他类的话。不知道。。

Answer 3

可以先动态创建一个类物料文件，然后能过反射调用这个类

追问

不理解，详细点？

追答

类文件编译后是dll文件,dll文件可以通过反射调用类里面的属性和方法。你搜索下c# 反射