Array size in C# determine

Question

First of all i'm novice to C#. How to determine array size in C# ? with the if condition check.

Normally php do like this,

if((sizeof($NewArray)==3) && (strtolower($NewArray[1])=='dddd'))

I just tried it out like this,

 If(NewArray.Length)==3) && (

After that i'm stucking ....

As a side note to the main answer, it's considered bad practice to use ToLower() when what you want to do is make a case insensitive string comparison. It's not too bad when done once or twice, but in a method that's called many times, it could cause performance problems since ToLower create and allocates a new string every time. You can use myString.Equals("secondString", StringComparison.CurrentCultureIgnoreCase), which is a bit bulkier, but smarter. — Avner Shahar-Kashtan
– Avner Shahar-Kashtan, Commented Jun 7, 2012 at 10:54

Jeffrey Zhao · Accepted Answer · 2012-06-07 10:52:09Z

3

You're looking for ToLower() method?

if (newArray.Length == 3 && newArray[1].ToLower() == "dddd") ...

answered Jun 7, 2012 at 10:52

Jeffrey Zhao

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Adam Houldsworth · Accepted Answer · 2012-06-07 11:04:44Z

I'm not sure what part you are stuck with so I shall explain all the parts I think I can see.

It looks like you are looking for the indexer syntax on arrays.

The code you may want is:

if (NewArray.Length == 3 && NewArray[1].ToLower() == "dddd")

Note the square brackets [] indexing into the array. Regular C# arrays exposes an int indexer. Once indexed, the dot-notation will give you access to the type inside the array, here I assume that the array is a string[], hence we can do NewArray[1].<string members here>.

Note also that array indexing in C# is zero-based, so 0 is the first element of the array and NewArray.Length - 1 is the last element. Your [1] may not be correct unless of course you intend on accessing the second array item.

As a side note, using ToLower is not the only way to get case-insensitive comparisons, you can also do the following:

string.Compare(NewArray[1], "dddd", true) == 0

The string.Compare documentation shows the ignoreCase argument. I'm not in any way trying to say my suggestion is best practice.

manny · Accepted Answer · 2012-06-07 11:12:49Z

1

 //in php
 if((sizeof($NewArray)==3) && (strtolower($NewArray[1])=='dddd'))

 //in C#
 if ((NewArray.Length == 3) && (NewArray[1].ToLower() == "dddd"))

edited Jun 7, 2012 at 11:12

answered Jun 7, 2012 at 11:01

manny

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1 Comment

Franky Over a year ago

This won't compile because (NewArray[1] == "ddd") returns a boolean and there is no ToLower() on bool.

Asif Mushtaq · Accepted Answer · 2012-06-07 10:52:06Z

0

Try this

if( NewArray.Length== 3 && NewArray[1].ToLower() =="dddd")

answered Jun 7, 2012 at 10:52

Asif Mushtaq

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