C# Programming Performance Tips - Part Six - Array Length

In this blog, we will see how to use Array.Length before iterating an array.

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

• C# Programming Performance Tips - Part One - String Split
• C# Programming Performance Tips - Part Two - String Equals
• C# Programming Performance Tips - Part Three - Adding Strings
• C# Programming Performance Tips - Part Four - List.Count() Vs List.Any()
• C# Programming Performance Tips - Part Five - List.Count() Vs List.Count
• 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