C# 动态创建一个类

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();

}