C# 在运行时动态创建类型

C# 在运行时动态的创建类型，这里是通过动态生成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

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();
        }