如果将字符串的内容作为代码执行

[qiang119]

例如:b="string a;"；
如何 通过执行变量b 从而达到程序自动定义变量a ？？？

[sx_lxh]

动态编译。
例：获取字符串所表示的逻辑意义

/*****************************************************************
** 文件名: Eval.cs
** Copyright (c) 1999 -2003
** 创建人: Phoenix
** 创建日期:
** 修改人:
** 修改日期:
** 描 述: 获取字符串所表示的逻辑意义
** 版 本:1.0
******************************************************************/


public class Eval
{
public 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);
CodeDomProvider compiler=new CSharpCodeProvider() ;
//ICodeCompiler compiler = new CSharpCodeProvider().CreateCompiler();
string[] referenceAssemblies={"System.dll"};
CompilerParameters para = new CompilerParameters(referenceAssemblies ,"Eval.dll",false );
//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");
object ret = mi.Invoke(obj, null);
return ret;


}
}