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问题描述
有很多算法来评估EX pressions,例如:
There are many algorithms to evaluate expressions, for example:
- By Recursive Descent
- Shunting-yard algorithm
- Reverse Polish notation
有没有办法来评价使用C#.NET的反射或其他现代.NET技术的所有数学EX pression?
Is there any way to evaluate any mathematical expression using C# .net reflection or other modern .net technology?
推荐答案
继托马斯的答案,它实际上可以访问(DE precated)的JScript库直接从C#中,这意味着您可以使用JScript中的等效评估
的功能。
Further to Thomas's answer, it's actually possible to access the (deprecated) JScript libraries directly from C#, which means you can use the equivalent of JScript's eval
function.
using Microsoft.JScript; // needs a reference to Microsoft.JScript.dll
using Microsoft.JScript.Vsa; // needs a reference to Microsoft.Vsa.dll
// ...
string expr = "7 + (5 * 4)";
Console.WriteLine(JScriptEval(expr)); // displays 27
// ...
public static double JScriptEval(string expr)
{
// error checking etc removed for brevity
return double.Parse(Eval.JScriptEvaluate(expr, _engine).ToString());
}
private static readonly VsaEngine _engine = VsaEngine.CreateEngine();
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