Generic method to execute any method with 1 time retry using Delegates

Question

I am trying to develop a mechanism using which I can execute any method with 1 retry attempt.

The retry will be triggered if an exception is encountered in the 1st run.

The basic Idea is, I will have a generic class for the retry logic, and I want to pass any method in it via delegates. And that method will be executed with 1 retry.

So far I have developed this.

public class RetryHandler
{
    Delegate _methodToRetry;

    // default constructor with delegate to function name.
    public RetryHandler(Delegate MethodToExecuteWithRetry)
    {
        _methodToRetry = MethodToExecuteWithRetry;
    }

    public void ExecuteWithRetry(bool IsRetryEnabled)
    {
        try
        {
            _methodToRetry.DynamicInvoke();
        }
        catch (Exception ex)
        {
            if (IsRetryEnabled)
            {
                // re execute method.
                ExecuteWithRetry(false);
            }
            else
            {
                // throw exception
                throw;
            }
        }

    }


}

Now I have a problem:

The methods which I want to pass have different Input parameters (both by number of parameters and object types) and different output parameters.

Is there any way by which I can achieve this? Basically I want to call the methods like this:

RetryHandler rh = new RetryHandler(MyMethod1(int a, int b));
int output = (int) rh.ExecuteWithRetry(true);

RetryHandler rh2 = new RetryHandler(MyMethod2(string a));
string output2 = (string) rh2.ExecuteWithRetry(true);

Any help would be much appreciated. Thank you.

Answer 1

You an wrap the call:

public T Retry<T>(Func<T> func)
{
    try { return func(); }
    catch { return func(); }
}

This will let you to call anything returning a value:

public int Test(int a, int b) => a + b;
public string Test(string a) => a + a;

void Example()
{
    Console.WriteLine(Retry(() => Test(1, 2)));
    Console.WriteLine(Retry(() => Test("a")));
}