寻找一个特殊的函数，在ASP中是Execute() 动态执行脚本

Question

在asp中，可以用Execute将字符串执行，来计算或者更改变量 
dim TestIf :TestIf=False
Execute("If 1=1 Then TestIf = True Else TestIf = False")然后在后面是TestIf的值是True简单说，就是可以执行脚本过程！请问下，在.NET中有没有办法实现这个功能？

Answer 1

http://www.systemnetmail.com/faq/4.4.aspx

Answer 2

使用CodeDom
http://msdn.microsoft.com/zh-cn/library/y2k85ax6.aspx

Answer 3

        static string GenerateCode(string str)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("using System;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Collections.Generic;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Linq;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Web;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Web.UI;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Text.RegularExpressions;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Net;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.IO;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.CodeDom.Compiler;");
            sb.Append(Environment.NewLine);
            sb.Append("using Microsoft.CSharp;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Reflection;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Text;");
            sb.Append(Environment.NewLine);
            sb.Append("using System.Data.SqlClient;");
            sb.Append(Environment.NewLine);
            sb.Append("namespace CMS");
            sb.Append(Environment.NewLine);
            sb.Append("{");
            sb.Append(Environment.NewLine);
            sb.Append("      public class DiyCS");
            sb.Append(Environment.NewLine);
            sb.Append("      {");
            sb.Append(Environment.NewLine);
            sb.Append("          public DiyCS() {}");
            sb.Append(Environment.NewLine);
            sb.Append("          public object str;");
            sb.Append(Environment.NewLine);
            sb.Append("          public object OutPut()");
            sb.Append(Environment.NewLine);
            sb.Append("          {");
            sb.Append(Environment.NewLine);
            sb.Append("               str = null;");
            sb.Append(Environment.NewLine);
            sb.Append("               " + str + "");
            sb.Append(Environment.NewLine);
            sb.Append("               return str;");
            sb.Append(Environment.NewLine);
            sb.Append("          }");
            sb.Append(Environment.NewLine);
            sb.Append("      }");
            sb.Append(Environment.NewLine);
            sb.Append("}");
            return sb.ToString();
        }        public static string ParseCode(string str)
        {
            object b = null;            CodeDomProvider p = new CSharpCodeProvider(new Dictionary<string, string>() { { "CompilerVersion", "v3.5" } });
            CompilerParameters cp = new CompilerParameters();
            cp.ReferencedAssemblies.Add("System.dll");
            cp.ReferencedAssemblies.Add("System.Configuration.dll");
            cp.ReferencedAssemblies.Add("System.Core.dll");
            cp.ReferencedAssemblies.Add("System.Data.dll");
            cp.ReferencedAssemblies.Add("System.Data.DataSetExtensions.dll");
            cp.ReferencedAssemblies.Add("System.Data.Entity.dll");
            cp.ReferencedAssemblies.Add("System.Drawing.dll");
            cp.ReferencedAssemblies.Add("System.EnterpriseServices.dll");
            cp.ReferencedAssemblies.Add("System.Runtime.Serialization.dll");
            cp.ReferencedAssemblies.Add("System.Security.dll");
            cp.ReferencedAssemblies.Add("System.Web.dll");
            cp.ReferencedAssemblies.Add("System.Web.Extensions.dll");
            cp.ReferencedAssemblies.Add("System.Web.Mobile.dll");
            cp.ReferencedAssemblies.Add("System.Web.Services.dll");
            cp.ReferencedAssemblies.Add("System.Xml.dll");
            cp.ReferencedAssemblies.Add("System.Xml.Linq.dll");
            cp.GenerateInMemory = true;
            cp.IncludeDebugInformation = false;            CompilerResults cr = p.CompileAssemblyFromSource(cp, GenerateCode(str));            if (cr.Errors.HasErrors)
            {
                foreach (CompilerError err in cr.Errors)
                {
                    b = "编译错误：" + err.ErrorText;
                }
            }
            else
            {                Assembly objAssembly = cr.CompiledAssembly;
                object objHelloWorld = objAssembly.CreateInstance("CMS.DiyCS");
                MethodInfo objMI = objHelloWorld.GetType().GetMethod("OutPut");                b = objMI.Invoke(objHelloWorld, null);
            }
            return b.tostr();
        }
调用方式：string a = ParseCode("if(true){str = 1;}else{str = 0;}");
输出：a=1

Answer 4

现在可以用 Roslyn~ 太特么强大了，有木有。http://www.codeproject.com/Articles/113169/C-As-A-Scripting-Language-In-Your-NET-Applications