using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class A
    {
        public void DoTask(int id) { Console.WriteLine("dotask: " + id); }
        public void DoAnotherTask(int id) { Console.WriteLine("other: " + id); }
    }
    class Program
    {
        static void Main(string[] args)
        {
            string s1 = "DoTask(2)";
            string s2 = "DoAnotherTask(100)";
            ExeMethod(s1);
            ExeMethod(s2);
        }

        static void ExeMethod(string exp)
        {
            string methodname = Regex.Match(exp, @"\w+(?=\()").Value;
            int param = int.Parse(Regex.Match(exp, @"(?<=\()\d+(?=\))").Value);
            typeof(A).GetMethods().First(x => x.Name == methodname).Invoke(new A(), new object[] { param });            
        }
    }
}

------解决方案--------------------
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引用:

C# code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
class A
……