Question

I want to call the functions by their name at run time like

string srFunctionName="MyFunction";

So with using this variable i want to call function named as “MyFunction”. How can i do that ?

Answer 1

You could use Reflection:

string strFunctionName = "MyFunction";

// get the type containing the method
Type t = Type.GetType("Foo.Bar.SomeTypeContainingYourFunction");

// you will need an instance of the type if the method you are
// trying to invoke is not static. If it is static you could leave that null
object instance = Activator.CreateInstance(t);

// the arguments that your method expects
new object[] arguments = new object[] { 1, "foo", false };

// invoke the method
object result = t.InvokeMember(
    strFunctionName, 
    BindingFlags.InvokeMethod, 
    null, 
    instance, 
    arguments
);

---

UPDATE:

As requested in the comments section here’s a full example with real functions:

using System;
using System.Reflection;

namespace Foo.Bar
{
    public class SomeTypeContainingYourFunction
    {
        public string MyFunction(int foo, string bar, bool baz)
        {
            return string.Format("foo: {0}, bar: {1}, baz: {2}", foo, bar, baz);
        }
    }
}

namespace Bazinga
{
    class Program
    {
        static void Main()
        {
            var strFunctionName = "MyFunction";
            var t = Type.GetType("Foo.Bar.SomeTypeContainingYourFunction");
            var instance = Activator.CreateInstance(t);
            var arguments = new object[] { 1, "foo", false };
            var result = t.InvokeMember(
                strFunctionName, 
                BindingFlags.InvokeMethod, 
                null, 
                instance, 
                arguments
            );
            Console.WriteLine(result);
        }
    }
}