调试System.FormatException

Question

"Index (zero based) must be greater than or equal to zero and less than the size of the argument list."
("Der Index, basierend auf 0 (null), muss größer als oder gleich Null sein, und kleiner als die Größe der Argumentenliste.")

when executing the line:

search.Filter = string.Format(filter,filterparams);

where, at runtime, filter contains "(sAMAccountName={0})(sAMAccountName={1})" and filterparams is a StringList with the two member strings "Testuser" and "Vertrieb".

What exactly is the error message trying to tell me?

Answer 1

The error says that there are more tokens in the format string than in the argument list. The second parameter of String.Format is an array of objects (from MSDN):

public static string Format(
    string format,
    params object[] args
)

The StringList is not implicitly converted to an array of objects so that String.Format interprets the StringList as one argument - hence the error.