c# 将字符串转换为逻辑表达式（字符串转换布尔）

比如：string str="6>5";

要的效果是：bool result=6>5

方案一：

命名空间：System.Data；

DataTable dt = new DataTable();

bool result= (bool)dt.Compute("","");dt.Compute(str, "");

方案二：

动态表达式：

 public class Expression
     {
         object instance;
         MethodInfo method;
         /// <summary>
         /// 表达试运算
         /// </summary>
         /// <param name="expression">表达试</param>
         public Expression(string expression)
         {
   if (expression.IndexOf("return") < ) expression = "return " + expression + ";";
             string className = "Expression";
             string methodName = "Compute";
             CompilerParameters p = new CompilerParameters();
             p.GenerateInMemory = true;
             CompilerResults cr = new CSharpCodeProvider().CompileAssemblyFromSource(p, string.
               Format("using System;sealed class {0}{{public bool {1}(bool x){{{2}}}}}",
               className, methodName, expression));
             if (cr.Errors.Count > )
             {
                 string msg = "Expression(\"" + expression + "\"): \n";
                 foreach (CompilerError err in cr.Errors) msg += err.ToString() + "\n";
                 throw new Exception(msg);
             }
             instance = cr.CompiledAssembly.CreateInstance(className);
             method = instance.GetType().GetMethod(methodName);
  }
  /// <summary>
         /// 处理数据
         /// </summary>
         /// <param name="x"></param>
         /// <returns>返回计算值</returns>
         public bool Compute(bool x)
         {
             return (bool)method.Invoke(instance, new object[] { x });
         }

方案三：

欢迎各位各位提供方案，谢谢！