public override int Calculate(string request)
{
if (request.Contains("+"))
{
int index = request.IndexOf('+');
int a = 0;
int b = 0;
int result = 0;
if (index >= 0)
{
string strA = request.Substring(0, index);
a = IsNumber(strA);
string strB = request.Substring(index + 1);
b = IsNumber(strB);
}
result = a + b;
return(result);
}
else
{
return(_nextChain.Calculate(request));
}
}
