C #: Get the value expressed by the string by dynamic compilation

compiling | dynamic | Strings See a lot of people often ask this question: How to String "126 + (256-2^4)", or How to judge "> 56 | | 14<45 "Results etc, checked on MSDN, wrote an eval class

/*****************************************************************
* * FileName: Eval.cs
* * Copyright (c) 1999-2003
* * Creator: Phoenix
* * Date Created:
* * Modified Person:
* * Modified Date:
* * Description: Gets the logical meaning represented by the string
* * Version: 1.0
******************************************************************/

Using System.CodeDom;
Using System.CodeDom.Compiler;
Using Microsoft.csharp;
Using System.Reflection;

public class Eval
{
Static Object GetValue (string value)
{
String codesnippet = "Using System;" + "\ r \ n" +
"Namespace Czg {" + "\ r \ n" +
"Public class Eval" + "\ r \ n" +
"{" + "\ r \ n" +
"Public Eval () {}" + "\ r \ n" +
"Public object GetValue ()" + "\ r \ n" +
"{" + "\ r \ n" +
"Return" + Value + ";" + "\ r \ n" +
"}" + "\ r \ n" +
" } }";

CodeSnippetCompileUnit unit = new CodeSnippetCompileUnit (CodeSnippet);

ICodeCompiler compiler = new CSharpCodeProvider (). CreateCompiler ();
CompilerParameters para = new CompilerParameters ();
Para. Referencedassemblies.add ("System.dll");
Para. GenerateInMemory = true;
Para. GenerateExecutable = false;
Para. outputassembly = "Eval.dll";

Assembly asm = COMPILER.COMPILEASSEMBLYFROMDOM (para, unit). compiledassembly;

Type type = asm. GetType ("Czg.eval");
MethodInfo mi = type. GetMethod ("GetValue", BindingFlags.Public | BindingFlags.Instance);

Object obj = asm. CreateInstance ("Czg.eval");

Return MI. Invoke (obj, null);
}
}

------------------------------------------------------------------------

Call:

Console.WriteLine (Eval.getvalue ("125-23"));
Console.WriteLine (Eval.getvalue ("125<23"));

Output:
102
False