cyf
108 lines
3.4 KiB
C#
108 lines
3.4 KiB
C#
using System;
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using System.CodeDom.Compiler;
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using System.Reflection;
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using System.Windows.Forms;
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using CommonLib;
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using System.Data;
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using Microsoft.CSharp;
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using System.Text;
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namespace Lskj.Common {
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/**/
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/// <summary>
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/// 动态求值
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/// </summary>
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public class Evaluator {
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/**/
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/// <summary>
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/// 计算结果,如果表达式出错则抛出异常
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/// </summary>
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/// <param name="statement">表达式,如"1+2+3+4"</param>
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/// <returns>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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if ((!string.IsNullOrEmpty(statement)) && (statement.Substring(0, 1) == "@"))
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{
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DataTable dt = SqlHelper.ExecuteDataSet(statement.Substring(1)).Tables[0];
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if (dt == null)
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return 0;
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if (dt.Rows.Count < 1)
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return 0;
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return dt.Rows[0][0];
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}
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if (string.IsNullOrEmpty(statement))
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statement = "1==1";
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JSCaller caller = new JSCaller();
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obj = caller.Eval(statement);
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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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PubUtil.WriteLog("请仔细检查配置列条件[" + statement + "]" + 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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/**/
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/// <summary>
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///
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/// </summary>
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static Evaluator() {
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try
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{
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CodeDomProvider provider = CodeDomProvider.CreateProvider("JScript");
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CompilerParameters options = new CompilerParameters
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{
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ReferencedAssemblies = {
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"System.dll",
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AppDomain.CurrentDomain.BaseDirectory + @"Microsoft.JScript.dll"
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},
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GenerateInMemory = false
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};
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CompilerResults results;
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results = provider.CompileAssemblyFromSource(options, _jscriptSource);
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Assembly assembly = results.CompiledAssembly;
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_evaluatorType = assembly.GetType("Evaluator");
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_evaluator = Activator.CreateInstance(_evaluatorType);
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}
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catch (Exception)
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{
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}
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}
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private static object _evaluator = null;
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private static Type _evaluatorType = null;
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/**/
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/// <summary>
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/// JScript代码
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/// </summary>
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private static readonly string _jscriptSource =
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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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public static object Eval_Ex(string statement) {
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return null;
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}
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}
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}
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