Passing lists to user defined methods

[LeonPierre]

Hello

I have no experience in C# programming.

I want the user defined method below

public void RO(List<double> b,List<double> r,int n)
{
int i;

for (i=n;i>=0;i--)//load d reversed into r
{
r.Add(b[i]);
}
}

to load the values in p into r but when RO is called, r.Count = 0 so I get an error message, "Accessing an index with a value that is out of range."

How do I get r to have the same size as p?

Regards

Leon

[fpa75]

Do you know List<T>.Reverse() ?

http://msdn.microsoft.com/en-us/library/b0axc2h2(v=vs.110).aspx

[NinjaTrader_CalH]

Hello LeonPierre,

You may want to check the b.Count and ensure that there are values there to add.

With the looping and getting the out of index error, you are trying to get an index above the available count.

I would do checks through your method to ensure that you have the valid data before moving to the loop.

[LeonPierre]

I do. But list.Count=0 giving an out of range error is a general problem I have with user defined methods so I must find a way to solve this.

[LeonPierre]

Hello Cal

There are values in b and I have checked b.Count but I still get the error message.

Leon

[NinjaTrader_JC]

Hello Leon,

Are you checking the List objects in the Strategy or Indicator before you pass them into your method to make sure they are correct?