It probably isn't even possible to do this, but I will ask anyway. Is it possible to create a function that receives a string and then uses it as a right side argument for the goes to operator (=>) used in lambda?
Actually, what I want to do is to be able to redefine an specific method of a specific class during runtime. I want to be write down a function with the program running and attaching it to a delegate. Is it possible?
Your question is pretty unclear, but you can certainly use expression trees to create delegates dynamically at execution time. (There are other ways of doing it such as CodeDOM, but expression trees are handier if they do all you need. There are significant restrictions to what you can do, however.)
It's often easier to use a lambda expression with some captured variables though.
For example, to create a function which will add the specified amount to any integer, you could write:
static Func<int, int> CreateAdder(int amountToAdd)
{
return x => x + amountToAdd;
}
...
var adder = CreateAdder(10);
Console.WriteLine(adder(5)); // Prints 15
If this doesn't help, please clarify your question.