How to validate format for string.Format method

Question

string.Format has following method signature

string.Format(format, params, .., .. , ..);

I want to pass custom format each time like

Answer 1

You can validate with try catch, if format throw exceptin you log information and stop treatment.

try 
{ 
   string.Format(custFormat, params, .., .. , ..);
}
catch(FormatException ex)  
{ 
  throw ex;
}

string message = ProcessMessage(custFormat, name);