C#动态执行代码

动态执行代码

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.CodeDom;
using System.CodeDom.Compiler;

 

namespace csrepl {
    class Program {

 

        static string funcprefix = "using System; "
            + "public delegate void Proc(); "
            + "public class Wrapper {  "
            + "  public static object Set(string name, object value) {  "
            + "    AppDomain.CurrentDomain.SetData(name, value); "
            + "    return value;  "
            + "  } "
            + "  public static object Get(string name) {  "
            + "    return AppDomain.CurrentDomain.GetData(name); "
            + "  } "
            + "  public static object Invoke(Proc proc) {  "
            + "    proc(); "
            + "    return null;  "
            + "  } "
            + "  public static object Eval() { return  ";
        static string funcsuffix = ";  } }";

 


        static string StringEval(string expr) {
            string program = funcprefix + expr + funcsuffix;

 

            ICodeCompiler compiler = CodeDomProvider.CreateProvider("C#").CreateCompiler();
            CompilerParameters cp = new CompilerParameters();
            cp.GenerateExecutable = false;
            cp.GenerateInMemory = true;

 

            CompilerResults results = compiler.CompileAssemblyFromSource(cp, program);
            if (results.Errors.HasErrors) {
                if (results.Errors[0].ErrorNumber == "CS0029")
                    return StringEval("Invoke(delegate { " + expr + "; })");
                return results.Errors[0].ErrorText;
            }
            else {
                Assembly assm = results.CompiledAssembly;
                Type target = assm.GetType("Wrapper");
                MethodInfo method = target.GetMethod("Eval");
                object result = method.Invoke(null, null);
                return result == null ? null : result.ToString();
            }
        }

 

        static void Main(string[] args) {

 

            while (true ) {
                Console.Write("> ");
                Console.Out.Flush();
                string expr = Console.ReadLine();
                if (expr == null)
                    break;
                try {
                    string result = StringEval(expr);
                    Console.WriteLine(result);
                }
                catch (TargetInvocationException ex) {
                    Console.WriteLine(ex.InnerException.GetType().Name + ": " + ex.InnerException.Message);
                }
                catch (Exception ex) {
                    Console.WriteLine(ex.GetType().Name + ": " + ex.Message);
                }
            }

        }
    }
}

private void Compiler(string code)
        {
            CompilerParameters vCompilerParameters = new CompilerParameters();
            vCompilerParameters.GenerateExecutable = false;
            vCompilerParameters.GenerateInMemory = true;
            vCompilerParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");
            string vSource =
                "using System.Windows.Forms;\n" +
                "public class Temp\n" +
                "{\n" +
                "    public void Test()\n" +
                "    {\n" +
                "         " + code + "\n" +
                "    }\n" +
                "}\n";
            CompilerResults vCompilerResults =
                CodeDomProvider.CreateProvider("CSharp").CompileAssemblyFromSource(vCompilerParameters, vSource);

            Assembly vAssembly = vCompilerResults.CompiledAssembly;
            object vTemp = vAssembly.CreateInstance("Temp");
            MethodInfo vTest = vTemp.GetType().GetMethod("Test");
            vTest.Invoke(vTemp, null);
        }

 

string code = "int sum = 0;\nfor(int i = 0; i < 100; i++)\n{\nsum += i;\n}\nMessageBox.Show(sum.ToString());";
            Compiler(code);