基线 SVN r240

SVN-Revision: r240
2025-02-06 06:46:06 +00:00
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+/******************************
+* 说明：动态求值(功能类似于Bs Eval)
+* 创建人：龚宇超
+* 创建日期：2017-07-24
+* 修改人：
+* 修改日期：
+* 修改备注：
+* 版本：1.0.0.0
+******************************/
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Reflection;
+using System.CodeDom.Compiler;
+using System.Data;
+using System.Data.SqlClient;
+using Microsoft.JScript;
+using Microsoft.JScript.Vsa;
+using Lskj.Expression;
+
+namespace Lskj.Util
+{
+    /// <summary>
+    /// 动态求值(功能类似于Bs Eval)
+    /// </summary>
+    public class EvalHelper
+    {
+        /// <summary>
+        /// 数据连接
+        /// </summary>
+        public static SqlConnection _connection;
+        private static object mEvaluator = null;
+        private static Type mEvaluatorType = null;
+        private static readonly string mJscriptSource =
+            @"class Evaluator
+                {
+                    public function Eval(expr : String) : String 
+                    { 
+                        return eval(expr); 
+                    }
+                }";
+
+        /// <summary>
+        /// 构造JScript的编译驱动代码
+        /// </summary>
+        static EvalHelper()
+        {
+            //CodeDomProvider provider = CodeDomProvider.CreateProvider("JScript");
+            //CompilerParameters parameters;
+            //parameters = new CompilerParameters();
+            //parameters.GenerateInMemory = true;
+            //CompilerResults results;
+            //results = provider.CompileAssemblyFromSource(parameters, mJscriptSource);
+            //Assembly assembly = results.CompiledAssembly;
+            //mEvaluatorType = assembly.GetType("Evaluator");
+            //mEvaluator = Activator.CreateInstance(mEvaluatorType);
+        }
+
+        /// <summary>
+        /// <para>说明：计算表达式</para>
+        /// <para>异常：会抛出Exception,遇到无法计算的公式.</para>
+        /// <para>创建人：龚宇超</para>
+        /// <para>创建日期：2017-07-24 </para>
+        /// <para>修改人：</para>
+        /// <para>修改日期：</para>
+        /// <para>修改备注：</para>
+        /// <para>版本：1.0</para>
+        /// </summary>
+        /// <param name="statement">表达式:如(1+2+3-5)</param>
+        /// <returns>计算结果</returns>
+        public static object Eval(string statement)
+        {
+            return Eval2(statement);
+            //object obj = string.Empty;
+            //try
+            //{
+            //    obj = mEvaluatorType.InvokeMember(
+            //               "Eval",
+            //               BindingFlags.InvokeMethod,
+            //               null,
+            //               mEvaluator,
+            //               new object[] { statement }
+            //     );
+            //}
+            //catch (Exception e)
+            //{
+
+            //}
+            //return obj;
+        }
+
+
+        /// <summary>
+        /// <para>说明：计算表达式</para>
+        /// <para>异常：会抛出Exception,遇到无法计算的公式.</para>
+        /// <para>创建人：王一帆</para>
+        /// <para>创建日期：2020-03-04 </para>
+        /// <para>修改人：</para>
+        /// <para>修改日期：</para>
+        /// <para>修改备注：</para>
+        /// <para>版本：2.0</para>
+        /// </summary>
+        /// <param name="statement">表达式:如(1+2+3-5)</param>
+        /// <returns>计算结果</returns>
+        public static object Eval2(string statement)
+        {
+            object obj = string.Empty;
+            try
+            {
+                JSCaller caller = new JSCaller();
+                obj = caller.Eval(statement);
+                //obj = "0";
+                //obj = _evaluatorType.InvokeMember(
+                //           "Eval",
+                //           BindingFlags.InvokeMethod,
+                //           null,
+                //           _evaluator,
+                //           new object[] { statement }
+                // );
+            }
+            catch (Exception ex)
+            {
+                //MessageBox.Show("请仔细检查配置列条件[" + statement + "]" + ex.StackTrace + "\r\n" + ex.Message);
+
+            }
+            //if (string.IsNullOrEmpty(obj + ""))
+            //    return true;
+            return obj;
+        }
+        /// <summary>
+        /// <para>说明：(新版)计算表达式</para>
+        /// <para>异常：会抛出Exception,遇到无法计算的公式.</para>
+        /// <para>创建人：王一帆</para>
+        /// <para>创建日期：2022-04-12 </para>
+        /// <para>修改人：</para>
+        /// <para>修改日期：</para>
+        /// <para>修改备注：</para>
+        /// <para>版本：1.0</para>
+        /// </summary>
+        /// <param name="statement">表达式:如(1+2+3-5)</param>
+        /// <returns>计算结果</returns>
+        //public static object Eval(string statement)
+        //{
+        //    object obj = string.Empty;
+        //    try
+        //    {
+        //        Express exp = new Express("", statement);
+        //        obj = exp.Eval((DataRow)null);
+        //    }
+        //    catch (Exception e)
+        //    {
+
+        //    }
+        //    return obj;
+        //}
+
+    }
+}