假设一个字符串str="4*36+7+88/12^2"C#怎么直接计算出这个字符串变量str的算术值

假设一个字符串str="4*36+7+88/12^2"，C#如何直接计算出这个字符串变量str的算术值。
假设一个字符串str="4*36+7+88/12^2"，C#如何直接计算出这个字符串变量str的算术值。

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C# code

public static object Eval(string AExpression){    try    {        return new DataTable().Compute(AExpression, "");    }    catch    {        return null;    }}
[解决办法]
楼上有个问题，乘方在C#可不是这么表示阿，四则运算楼上是对的
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C# code
// SuperCalc.cs - 超级计算器using System;using System.Windows.Forms;using System.CodeDom.Compiler;using Microsoft.VisualBasic;using System.Reflection;using System.Text;using System.Globalization;namespace Skyiv{  class SuperCalc : Form  {    TextBox tbxA1;    TextBox tbxA3;    [STAThread]    static void Main(string [] args)    {      Application.Run(new SuperCalc());    }    SuperCalc()    {      Text              = "Super Calculator";      StartPosition     = FormStartPosition.CenterScreen;      Width             = 300;      Height            = 300;      tbxA1             = new TextBox();      tbxA1.Parent      = this;      tbxA1.Multiline   = true;      tbxA1.WordWrap    = false;      tbxA1.Dock        = DockStyle.Fill;      tbxA1.BorderStyle = BorderStyle.FixedSingle;      Panel pnlA1       = new Panel();      pnlA1.Parent      = this;      pnlA1.Height      = 22;      pnlA1.Dock        = DockStyle.Top;      tbxA3             = new TextBox();      tbxA3.Parent      = pnlA1;      tbxA3.Dock        = DockStyle.Fill;      tbxA3.BorderStyle = BorderStyle.FixedSingle;      tbxA3.ReadOnly    = true;      Button btnA3      = new Button();      btnA3.Text        = "&Calculate";      btnA3.Parent      = pnlA1;      btnA3.Width       = 80;      btnA3.Dock        = DockStyle.Left;      btnA3.Click      += new EventHandler(Calc_Clicked);    }    void Calc_Clicked(object sender, EventArgs ea)    {      (sender as Control).Enabled = false;      try      {        tbxA3.Text = (new Expression(tbxA1.Text)).Compute().ToString();      }      catch (Exception ex)      {        MessageBox.Show(ex.Message, "Error");      }      finally      {        (sender as Control).Enabled = true;      }    }  }  // VBExpression.cs - 动态生成数学表达式并计算其值  // 表达式使用 Visual Baisc 语法  // 可使用 pi、e 等常量，sin、cos、tan、log、sqrt 等函数  sealed class Expression  {    object instance;    MethodInfo method;    public Expression(string expression)    {      if (expression.ToUpper(CultureInfo.InvariantCulture).IndexOf("RETURN") < 0)      {        expression = "Return " + expression.Replace(Environment.NewLine, " ");      }      string className = "Expression";      string methodName = "Compute";      CompilerParameters p = new CompilerParameters();      p.GenerateInMemory = true;      CompilerResults cr = new VBCodeProvider().CompileAssemblyFromSource      (        p,        string.Format        (          @"Option Explicit Off          Option Strict Off          Imports System, System.Math, Microsoft.VisualBasic          NotInheritable Class {0}          Public Function {1} As Double          {2}          End Function          End Class",          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);    }    public double Compute()    {      return (double)method.Invoke(instance, null);    }  }}