Hello. First of all I would like to say that your tutorials are probably the best out there and thanks for the great work. I have a question tho. Why did you make the parameter array object type? Doesnt it suffer the two problems you explained on the Generics tutorial? Lack of Type Safety and Performance loss due to Boxing and Unboxing processes? Wouldnt it be possible and better to just type params int[] restOfNumbers? Thanks for clarification.
I think it's for flexibility. If you use object you can pass in short, double etc if you cast them before hand as int then you can use List for sum . Also without casting the arguments instead of looping with int if you loop with object you can first see what the type of the object is then handle accordingly. If you don't cast the method argument to int and use the List I'm pretty sure it will fail do to unboxing/boxing . static void Main(string[] args) { int i = 1; int i2 = 23; short s = 6; double d = 5.0; AddNumbers(i, i2); AddNumbers(i, s); AddNumbers(i, i2,8,9,10); AddNumbers(i, i2, (int)s, (int)d); //these willl fail do to unboxing if not handled correctly AddNumbers(i, i2, s); AddNumbers(i, i2, s, d); } public static void AddNumbers(int firstNumber, int secondNumber, params object[] restOfNumbers) {
int [] nbrs = { 1, 2, 3 }; List nAlso = nbrs.ToList(); List test = new List() { 1, 2, 3 }; List firstCoupleNumbers = new List(); firstCoupleNumbers.Add(firstNumber); firstCoupleNumbers.Add(secondNumber); Console.WriteLine(firstCoupleNumbers.Sum()); //List myParamsNbrs = restOfNumbers.Cast().ToList(); //Console.WriteLine(myParamsNbrs.Sum()); Console.WriteLine(restOfNumbers.Cast().ToList().Sum());
thank you sir
Hi Prashanth, sure, I will as soon as I can.
Excellent tutorial, easy to understand as usual. I liked each video :).
Hello. First of all I would like to say that your tutorials are probably the best out there and thanks for the great work. I have a question tho. Why did you make the parameter array object type? Doesnt it suffer the two problems you explained on the Generics tutorial? Lack of Type Safety and Performance loss due to Boxing and Unboxing processes? Wouldnt it be possible and better to just type params int[] restOfNumbers? Thanks for clarification.
Correct! I too have the same question
Also better to use params int[ ] to prevent string arguments.
great, that's what I was about to ask for!
As a side note, VB.NET uses the key word Optional for optional parameters. This is more elegant and straightforward.
That's great. Many thanks.
Mr. Venkat you are doing great. Could you please explain why you have used params object[] restOfNumber and not params int[] restOfNumbers? Thanks!!
I think it's for flexibility. If you use object you can pass in short, double etc if you cast them before hand as int then you can use List for sum . Also without casting the arguments instead of looping with int if you loop with object you can first see what the type of the object is then handle accordingly. If you don't cast the method argument to int and use the List I'm pretty sure it will fail do to unboxing/boxing .
static void Main(string[] args)
{
int i = 1;
int i2 = 23;
short s = 6;
double d = 5.0;
AddNumbers(i, i2);
AddNumbers(i, s);
AddNumbers(i, i2,8,9,10);
AddNumbers(i, i2, (int)s, (int)d);
//these willl fail do to unboxing if not handled correctly
AddNumbers(i, i2, s);
AddNumbers(i, i2, s, d);
}
public static void AddNumbers(int firstNumber, int secondNumber, params object[] restOfNumbers)
{
int [] nbrs = { 1, 2, 3 };
List nAlso = nbrs.ToList();
List test = new List() { 1, 2, 3 };
List firstCoupleNumbers = new List();
firstCoupleNumbers.Add(firstNumber);
firstCoupleNumbers.Add(secondNumber);
Console.WriteLine(firstCoupleNumbers.Sum());
//List myParamsNbrs = restOfNumbers.Cast().ToList();
//Console.WriteLine(myParamsNbrs.Sum());
Console.WriteLine(restOfNumbers.Cast().ToList().Sum());
Console.WriteLine("*******************************");
}
Is params must be an object[] or it can be any type array?
Excellent.
legend
Hi Venkat, Please upload creation of Graphs in ASP.NET ,even for charts.i.e. Pie chart
Thank you very much...
Why place holder context don't work here when writing to Console. We are using the concatenate method instead.