c# EVAL 动态执行代码 .net 执...

怼烎@ 2022-06-18 05:59 116阅读 0赞

using System;  
using System.Data;  
using System.Configuration;  
using System.CodeDom.Compiler;  
using Microsoft.CSharp;  
using System.Text;  
using System.Reflection;  
using System.Collections.Generic;  
using System.Net;  
using System.Text.RegularExpressions;  
  
namespace CommandDebugger  
\{  
/// <summary>  
/// C\#代码执行器，提供动态执行C\#代码  
/// </summary>  
public class Evaluator  
\{  
private static CSharpCodeProvider cCodeProder = null;  
private static CompilerParameters compPars = null;  
private static CompilerResults compResult = null;  
private static Regex rexLastCode = new Regex(@"(print:).+;\\s\*$", RegexOptions.Compiled | RegexOptions.IgnoreCase); //用于搜索最后一条代码的位置  
  
static Evaluator()  
\{  
cCodeProder = new CSharpCodeProvider();  
\}  
  
/// <summary>  
/// 执行指定的代码  
/// </summary>  
/// <param name="strCodes"></param>  
/// <returns></returns>  
public static string Eval(string strCodes, out string strErrText)  
\{  
\#region 编译代码  
strErrText = InitCompile(ref strCodes);  
if (strErrText != null) return null;  
try  
\{  
compResult = cCodeProder.CompileAssemblyFromSource(compPars, new string\[\] \{ strCodes \});  
\}  
catch (NotImplementedException nie)  
\{  
strErrText = nie.Message;  
return null;  
\}  
  
if (compResult.Errors.HasErrors)  
\{  
StringBuilder sbErrs = new StringBuilder(strCodes + System.Environment.NewLine);  
sbErrs.Append("您所提供的C\#代码中存在语法错误！" + System.Environment.NewLine );  
foreach (CompilerError err in compResult.Errors)  
\{  
sbErrs.AppendFormat("\{0\}，\{1\}" + System.Environment.NewLine, err.ErrorNumber, err.ErrorText);  
\}  
strErrText = sbErrs.ToString();  
return null;  
\}  
\#endregion  
  
Assembly assembly = compResult.CompiledAssembly;  
object prgInsl = assembly.CreateInstance("System.\_ClassEvaluatorCompiler");  
MethodInfo medInfo = prgInsl.GetType().GetMethod("PrintResult");  
string strRetn;  
try  
\{  
strRetn = medInfo.Invoke(prgInsl, null).ToString();  
return strRetn;  
\}  
catch(Exception exMsg)  
\{  
strErrText = exMsg.Message;  
return null;  
\}  
\}  
  
/// <summary>  
/// 预编译代码  
/// </summary>  
/// <param name="strCodes">待编译的源代码</param>  
/// <returns>如果错误则返回错误消息</returns>  
private static string InitCompile(ref string strCodes)  
\{  
List<string> lstRefs = new List<string>();//代码字符串中的include引用程序集------未使用  
  
List<string> lstUsings = new List<string>();//代码字符串中的using引用命名空间  
  
  
\#region 分离引用的程序集与命名空间  
int point = 0;  
string strTemp;  
char\[\] cCodes = strCodes.ToCharArray();  
for (int i = 0; i < cCodes.Length; ++i)  
\{  
if (cCodes\[i\] == '\\n' || (cCodes\[i\] == '\\r' && cCodes\[i + 1\] == '\\n'))  
\{  
strTemp = strCodes.Substring(point, i - point);  
if (strTemp.TrimStart(new char\[\] \{ ' ' \}).StartsWith("using "))  
\{  
strTemp = strTemp.Substring(6).Trim();  
if (!lstUsings.Contains(strTemp))  
\{  
lstUsings.Add(strTemp);  
\}  
else  
\{  
return "预编译失败，代码中不允许包含重复命名空间导入。"+System.Environment.NewLine+"using " + strTemp;  
\}  
point = cCodes\[i\] == '\\n' ? i + 1 : i + 2;  
\++i;  
\}  
else if (strTemp.TrimStart(new char\[\] \{ ' ' \}).StartsWith("include "))  
\{  
strTemp = strTemp.Substring(8).Trim().ToLower();  
if (!lstRefs.Contains(strTemp))  
\{  
lstUsings.Add(strTemp);  
\}  
else  
\{  
return "预编译失败，代码中不允许包含重复的程序集引用。"+System.Environment.NewLine+"include " + strTemp;  
\}  
point = cCodes\[i\] == '\\n' ? i + 1 : i + 2;  
\++i;  
\}  
else  
\{  
break;  
\}  
\}  
\}  
strCodes = strCodes.Substring(point);  
\#endregion  
  
\#region 初始化编译参数  
if (compPars == null)  
\{  
compPars = new CompilerParameters();  
compPars.GenerateExecutable = false;  
compPars.GenerateInMemory = true;  
\}  
//string workDir = System.Web.HttpContext.Current.Server.MapPath("~") + "Bin\\\\";  
//string workDir = System.Environment.CurrentDirectory;  
compPars.ReferencedAssemblies.Clear();  
compPars.ReferencedAssemblies.Add("system.dll");  
compPars.ReferencedAssemblies.Add("system.data.dll");  
compPars.ReferencedAssemblies.Add("system.xml.dll");  
  
//compPars.ReferencedAssemblies.Add(workDir + "BLL.dll");  
//compPars.ReferencedAssemblies.Add(workDir + "Component.dll");  
//compPars.ReferencedAssemblies.Add(workDir + "Model.dll");  
//compPars.ReferencedAssemblies.Add(workDir + "Utility.dll");  
  
foreach (string str in lstRefs)  
\{  
compPars.ReferencedAssemblies.Add(str);  
\}  
\#endregion  
  
StringBuilder sbRetn = new StringBuilder();  
  
\#region 生成代码模板  
///\*为代码添加return 语句\*/  
Match match = rexLastCode.Match(strCodes);  
if (match.Success)  
\{  
strCodes = string.Format("\{0\}\\r\\nreturn \{1\}", strCodes.Substring(0, match.Groups\[1\].Index), strCodes.Substring(match.Groups\[1\].Index + match.Groups\[1\].Length));  
\}  
else  
\{  
strCodes = "return " + strCodes.Trim();//把要运行的代码字符串作为返回值---作为输出 - 显示运行的字符串源码  
\}  
  
/\*拼接代码\*/  
foreach (string str in lstUsings)  
\{  
sbRetn.AppendLine("using " + str);  
\}  
sbRetn.AppendLine("namespace System\{");  
sbRetn.AppendLine("public class \_ClassEvaluatorCompiler\{");  
sbRetn.AppendLine("public static object PrintResult()\{");  
sbRetn.AppendLine(strCodes);  
sbRetn.AppendLine("\}\}\}");  
\#endregion  
strCodes = sbRetn.ToString();  
return null;  
\}  
  
  
\}  
  
  
  
public class ProgramTest  
\{  
static void Main(string\[\] args)  
\{  
string error = string.Empty;  
string res = string.Empty;  
string code = "1+1/0;";  
  
//c\# EVAL 动态 执行 代码 .net 执行 字符串 代码  
res = CommandDebugger.Evaluator.Eval(code, out error);  
  
  
if (!string.IsNullOrEmpty(error))  
\{  
Console.WriteLine(error);  
\}  
else  
\{  
Console.WriteLine("执行结果为：" + res);  
\}  
\}  
\}  
  
  
\}