c# - How to enumerate passed method parameters

Question

One can enumerate the called method parameter types/information like this:

private void SomeMethod(int thisValue, string thatValue)
{
  StackTrace stackTrace = new StackTrace();
  foreach (ParameterInfo pInfo in stackTrace.GetFrame(0).GetMethod().GetParameters())
  {
    string name = pInfo.Name;
    string type = pInfo.GetType().ToString();
  }
}

But is there any way to get the actual object of each parameter?

EDIT: My goal is to enumerate all parameters and get their values. Using LinQ Expressions, one can get the parameter value like so:

private void SomeMethod(int thisValue, string thatValue)
{
  object valueOfThis = GetParameterValue(() => thisValue);
  object valueOfThat = GetParameterValue(() => thatValue);
}
private object GetParameterValue<T>(Expression<Func<T>> expr)
{
  var body = ((MemberExpression)expr.Body);
  return ((FieldInfo)body.Member).GetValue(((ConstantExpression)body.Expression).Value);
}

But what I would like to do is something like:

foreach (fooObject o in thisMethod.GetParameterObjects())
{
  object someValue = GetParameterValue(() => fooObject);
}

And thereby have a generic method for collection all parameters and their values.

Answer 1

UPDATE:

Looks like I "overcomplicated" the initial answer by trying to explain everything. Here is the short version of the answer.

private static void SomeMethod(int thisValue, string thatValue)  
{ 
    IEnumerable<object> parameters = GetParameters(() => SomeMethod(thisValue, thatValue)); 
    foreach (var p in parameters) 
        Console.WriteLine(p); 
}
private static IEnumerable<object> GetParameters(Expression<Action> expr)
{
    var body = (MethodCallExpression)expr.Body;
    foreach (MemberExpression a in body.Arguments)
    {
        var test = ((FieldInfo)a.Member).GetValue(((ConstantExpression)a.Expression).Value);
        yield return test;
    }
}

And here is the long version with some explanations.

In fact, if you use expression trees, you don't need to be inside a method to enumerate its parameters.

    static void Main(string[] args)
    {

        // First approach.
        IEnumerable<object> parameters = GetParametersFromConstants(() => SomeMethod(0, "zero"));
        foreach (var p in parameters)
            Console.WriteLine(p);

        // Second approach.
        int thisValue = 0;
        string thatValue = "zero";
        IEnumerable<object> parameters2 = GetParametersFromVariables(() => SomeMethod(thisValue, thatValue));
        foreach (var p in parameters2)
            Console.WriteLine(p);

        Console.ReadLine();
    }

    private static void SomeMethod(int thisValue, string thatValue) 
    {
        Console.WriteLine(thisValue + " " + thatValue);
    }      

    private static IEnumerable<object> GetParametersFromVariables(Expression<Action> expr)
    {
        var body = (MethodCallExpression)expr.Body;
        foreach (MemberExpression a in body.Arguments)
        {               
            var test = ((FieldInfo)a.Member).GetValue(((ConstantExpression)a.Expression).Value);
            yield return test;
        }
    }

    private static IEnumerable<object> GetParametersFromConstants(Expression<Action> expr)
    {
        var body = (MethodCallExpression)expr.Body;
        foreach (ConstantExpression a in body.Arguments)
        {
            var test = a.Value;
            yield return test;
        }
    }

}

Note, that if you use expression trees, your code depends a lot on an expression passed to the method. I have shown one using constants and one using variables. But of course there can be more scenarios. You can refactor this code to use a single method for both cases, but I decided that is illustrates the problem better this way.