使用.net执行python代码，解析表达式

以前听说过.net可以执行python代码，这次终于派上用场了
NUGET 安装 IronPython .NET版本4.8以下选择 2.7.8 这个版本

 public static string ExecPython(string pyCode)
       {
          ScriptEngine engine = Python.CreateEngine();
          ScriptScope scope = engine.CreateScope();
          var sourceCode = engine.CreateScriptSourceFromString(pyCode);
          var result = sourceCode.Execute<object>(scope);
          return result.ToString();
      }

关键词需要符合python的语法规范

对于简单表达式，自带的DataTable也能解析，测试无法判断 ==
但是速度比py的快

string expression = "1+1";
DataTable eval = new DataTable();
object result = eval.Compute(expression, "");
Console.WriteLine(result);

2020.11 Update

转成js去执行也挺好，费这个劲搞python划不来
引用 Microsoft.JScript
注意判断= =用 = = =

static VsaEngine Engine = VsaEngine.CreateEngine();
    static string EvalJScript(string JScript)
    {
        string Result = null;
        try
        {
            Result = Microsoft.JScript.Eval.JScriptEvaluate(JScript, Engine).ToString();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        return Result;
    }

不过上面那个效率实在是实在是非常低，换下面这个

public class JsEngine
    {
        public static int EvalToInteger(string statement)
        {
            string s = EvalToString(statement);
            return int.Parse(s.ToString());
        }

        public static double EvalToDouble(string statement)
        {
            string s = EvalToString(statement);
            return double.Parse(s);
        }

        public static string EvalToString(string statement)
        {
            object o = EvalToObject(statement);
            return o.ToString();
        }

        public static object EvalToObject(string statement)
        {
            return _evaluatorType.InvokeMember(
                        "Eval",
                        BindingFlags.InvokeMethod,
                        null,
                        _evaluator,
                        new object[] { statement }
                     );
        }

        static JsEngine()
        {
            ICodeCompiler compiler;
            compiler = new JScriptCodeProvider().CreateCompiler();

            CompilerParameters parameters;
            parameters = new CompilerParameters();
            parameters.GenerateInMemory = true;

            CompilerResults results;
            results = compiler.CompileAssemblyFromSource(parameters, _jscriptSource);

            Assembly assembly = results.CompiledAssembly;
            _evaluatorType = assembly.GetType("Evaluator.Evaluator");

            _evaluator = Activator.CreateInstance(_evaluatorType);
        }

        private static object _evaluator = null;
        private static Type _evaluatorType = null;
        private static readonly string _jscriptSource =

            @"package Evaluator
            {
               class Evaluator
               {
                  public function Eval(expr : String) : String 
                  { 
                     return eval(expr); 
                  }
               }
            }";
    }