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Index Out of Range Exceptions
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Index Out of Range Exceptions

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Index Out of Range Exceptions

When you see the dreaded Index Out of Range runtime error, it generally means that you are trying to access a value of an array that does not exist. Try{}Catch error handling will prevent these errors from crashing an indicator, but I now have zero tolerance for them. Here is how I deal with them.

One approach that often works is to make sure that the DataSeries or other type of array contains enough elements so that what you are trying to do can actually happen. For example, if you are using if(Risng(Values[0])) as a condition, don't do it unless Values[0].Count >=2, because if an array has less than 2 elements, Rising and Falling are meaningless.

Sometimes the errror occurs during startup when your array is empty, ie contains no elements and has a Count property of zero.. So for anything that accesses an array called MyArray, using if(MyArray.Count>3) as an enabling condition before trying to access a value of the array will take care of that condition.

Or before accessing the value for b bars back , check that MyArray.ContainsValue(b) is True.

If b is negative you can have problems. Unless you take special precautions and are more than b bars back from the CurrentBar, the value you are looking for will not exist. Avoid doing this.

NinjaTrader_RyanM thanked the original version of this post on the Ninjatrader forum, giving it an aura of respectability.

http://www.ninjatrader.com/support/forum/showthread.php?p=263028#post263028

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Zondor View Post
When you see the dreaded Index Out of Range runtime error, it generally means that you are trying to access a value of an array that does not exist. Try{}Catch error handling will prevent these errors from crashing an indicator, but I now have zero tolerance for them. Here is how I deal with them.

The Index Out of Range Runtime Error occurs when the code is flawed, meaning that the code is trying to access a value that does not exist.

Try{}Catch is certainly not the right response. Try{}Catch is quite similar to the ostrich sticking its head into the sand. You know that there is a problem, but you do not want to see it. The result is bad code, as the coder admits that he did not thoroughly understand his own code. I agree that zero tolerance is the best way to deal with this problem. You need to find out why the Index Out of Range runtime error occured, and not just hide it.

I mostly use Try{}Catch now, when an indicator or strategy accesses an other indicator or file, and I cannot be sure that this file exists on the PC of the user, but certainly not to avoid Index Out of Range runtime errors.

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