C# 代码编译器 及 编译器实例

// 备注:若返回值是字符串类型 则 需要 转义，不然 代码编译出错

using System;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.CSharp;
using System.Text;
using System.Reflection;

namespace CodeCompiler_Demo
{
public class Class
{
public static object GetObject(string strGreet)
{
CodeDomProvider codeProvider = CodeDomProvider.CreateProvider("CSharp");

System.CodeDom.Compiler.CompilerParameters parameters = new CompilerParameters();
parameters.ReferencedAssemblies.Add("System.dll");
parameters.GenerateExecutable = false;
parameters.GenerateInMemory = true;

string sourceCode = string.Empty;
StringBuilder sb = new StringBuilder();
sb.Append("using System;");
sb.Append(Environment.NewLine);
sb.Append("namespace CodeCompiler_Demo");
sb.Append(Environment.NewLine);
sb.Append("{");
sb.Append(Environment.NewLine);
sb.Append(" public class Greet");
sb.Append(Environment.NewLine);
sb.Append(" {");
sb.Append(Environment.NewLine);
sb.Append(" public string GetGreet()");
sb.Append(Environment.NewLine);
sb.Append(" {");
sb.Append(Environment.NewLine);
sb.Append(" return \"" + strGreet + "\";");
sb.Append(Environment.NewLine);
sb.Append(" }");
sb.Append(Environment.NewLine);
sb.Append(" }");
sb.Append(Environment.NewLine);
sb.Append("}");

sourceCode = sb.ToString();

CompilerResults results = codeProvider.CompileAssemblyFromSource(parameters, sourceCode);
object obj = null;
if (!results.Errors.HasErrors)
{
object entity = results.CompiledAssembly.CreateInstance("CodeCompiler_Demo.Greet");
MethodInfo mi = entity.GetType().GetMethod("GetGreet");
obj = mi.Invoke(entity, null);
}

return obj;

}

public static object GetEntity()
{
// 1.CSharpCodePrivoder
CSharpCodeProvider objCSharpCodePrivoder = new CSharpCodeProvider();

// 2.ICodeComplier
ICodeCompiler objICodeCompiler = objCSharpCodePrivoder.CreateCompiler();

// 3.CompilerParameters
CompilerParameters objCompilerParameters = new CompilerParameters();
objCompilerParameters.ReferencedAssemblies.Add("System.dll");
objCompilerParameters.GenerateExecutable = false;
objCompilerParameters.GenerateInMemory = true;

// 4.CompilerResults
CompilerResults cr = objICodeCompiler.CompileAssemblyFromSource(objCompilerParameters, GenerateCode());

object obj = null;
if (cr.Errors.HasErrors)
{

}
else
{
// 通过反射，调用HelloWorld的实例
Assembly objAssembly = cr.CompiledAssembly;
object objHelloWorld = objAssembly.CreateInstance("DynamicCodeGenerate.HelloWorld");
MethodInfo objMI = objHelloWorld.GetType().GetMethod("OutPut");

obj = objMI.Invoke(objHelloWorld, null);
}

return obj;

}

static string GenerateCode()
{
StringBuilder sb = new StringBuilder();
sb.Append("using System;");
sb.Append(Environment.NewLine);
sb.Append("namespace DynamicCodeGenerate");
sb.Append(Environment.NewLine);
sb.Append("{");
sb.Append(Environment.NewLine);
sb.Append(" public class HelloWorld");
sb.Append(Environment.NewLine);
sb.Append(" {");
sb.Append(Environment.NewLine);
sb.Append(" public string OutPut()");
sb.Append(Environment.NewLine);
sb.Append(" {");
sb.Append(Environment.NewLine);
sb.Append(" return \"Hello world!\"; ");
sb.Append(Environment.NewLine);
sb.Append(" }");
sb.Append(Environment.NewLine);
sb.Append(" }");
sb.Append(Environment.NewLine);
sb.Append("}");

string code = sb.ToString();

return code;
}
}
}