stackoverflow exception

Question

public static int ExecuteNonQuery(String procedure, params SqlParameter[] args)
{
    if (args == null) throw new ArgumentNullException("args");
    else
    return ExecuteNonQuery(procedure, new SqlParameter[] { });
}

Why getting recursive function and throwing StackOverFlow Exception when calling this above method.(while the argument contains 5 values)

Answer 1

Don't confuse an empty array with a null array . You're calling the same method again with an empty array, but the only check you have to cease this function is to check for a null array, and throw an exception. You need something like:

if (args.length == 0) {
   // bail out somehow
}

(after your null check, to prevent NPEs)

Answer 2

That is because overload resolution picks the same ExecuteNonQuery method, so you are essentially calling the same method over and over again.

Your method takes a SqlParameter[] (the params part is just syntactic sugar), and you are calling the same method again, with a SqlParameter[] as the second argument.

Answer 3

该函数将无限递归，因为没有终止条件：当使用非null args参数调用时，它只使用indentical参数调用自身，并且除了耗尽堆栈空间之外没有任何东西可以阻止此无限递归。

Answer 4

Perhaps you wanted something like

public static int ExecuteNonQuery(String procedure, params SqlParameter[] args)
{
  if (args == null) 
      return ExecuteNonQuery(procedure, new SqlParameter[] { });

  // Do some stuff here where args can be assumed != null
}

Answer 5

Your args variable is never null; You should to code:

return ExecuteNonQuery(procedure, null);

or to create an overload which doesn't have an args argument.

Answer 6

you need to check if the list has a length of 0, not if it is null. Or you could pass it null, like so:

 public static int ExecuteNonQuery(String procedure, params SqlParameter[] args)
 {
            if (args == null) throw new ArgumentNullException("args");
            else
            return ExecuteNonQuery(procedure, null);
 }

Answer 7

因为你在return语句中称呼自己。