C# Programming Performance Tips - Array Length

You can read all the C# performance tips from the following links,

1. C# Programming Performance Tips - Part One - String Split
2. C# Programming Performance Tips - Part Two - String Equals
3. C# Programming Performance Tips - Part Three - Adding Strings
4. C# Programming Performance Tips - Part Four - List.Count() Vs List.Any()
5. C# Programming Performance Tips - Part Five - List.Count() Vs List.Count
6. C# Programming Performance Tips - Part Six - Array Length

Often, developers tend to use Array.Length in the For loop as a condition but we need to understand that the Lenth property is called on each and every iteration. So, it is better to store it in a variable and use that variable as a condition.

Array.Length in the loop

Stopwatch watch = new Stopwatch();  
watch.Start();  
string[] names = {  
    "Akshay",  
    "Patel",  
    "Panth"  
};  
for (int i = 0; i < names.Length; i++) {}  
Console.WriteLine("Name.Length Direct-{0}", watch.Elapsed);

Array.Length stored in a variable

watch.Restart();  
string[] names1 = {  
    "Akshay",  
    "Patel",  
    "Panth"  
};  
int k = names1.Length;  
for (int j = 0; j < k; j++) {}  
Console.WriteLine("Name.Length Parameter-{0}", watch.Elapsed);

Benchmarking Result