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") < 0) 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 > 0)
            {
                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！