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