Combining CallerMemberName with params

Question

Right now (C# 4.0), our logging method looks like

public void Log(string methodName, string messageFormat, params object[] messageParameters)

where the logger does the string formatting, so that the caller does not have to put String.Format's to create a nice log message (and allows for the logger to skip the string formatting if no logviewer is attached).

With C# 5.0, I would like to get rid of the methodName parameter by using the new CallerMemberName attribute but I don't see how this can be combined with the 'params' keyword. Is there a way to do this?

Answer 1

You could do something like this:

protected static object[] Args(params object[] args)
{
    return args;
}

protected void Log(string message, object[] args = null, [CallerMemberName] string method = "")
{
    // Log
}

To use the log do like this:

Log("My formatted message a1 = {0}, a2 = {2}", Args(10, "Nice"));

Answer 2

I believe you simply can't combine params and optional parameters, which are required for CallerMemberName. The best you can do is to use actual array instead of params.