symbol [ ] in c#

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Hi,
I do not understand the symbols [] are used like in c # and what it would mean people are looking forward to for help? (Outside the array declaration)
thanks!
thanks!

Posted 24-Sep-10 9:48am

vanhienit

Updated 24-Sep-10 9:50am

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AspDotNetDev 24-Sep-10 15:54pm

Do you have an example of some code you don't understand that makes use of square brackets?

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Alan N · Answer 1 · 2010-09-24T13:54:00

If you mean code like the examples below then you are looking at attributes and there is an article here on CP. Attributes in C#[^]

C#

[STAThread]
static void Main() {
...

C#

[DllImport("user32.dll")]
private static extern IntPtr GetLastActivePopup(IntPtr hWnd);

C#

[System.ComponentModel.Description("Default directory for data files")]
[System.ComponentModel.Editor(typeof(System.Windows.Forms.Design.FolderNameEditor),
  typeof(System.Drawing.Design.UITypeEditor))]
public String DataDirectory { get; set; }

Alan.

AspDotNetDev · Answer 2 · 2010-09-24T09:52:00

Solution 1

That question doesn't make a whole lot of sense, but the square brackets are typically used to index collections. As a starting point, Google "c# arrays" and that will give you a good idea of what they are used for.

Posted 24-Sep-10 9:52am

AspDotNetDev

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AspDotNetDev 24-Sep-10 15:53pm

Also, they can be used as an indexer on a class.

Abhishek Sur · Answer 3 · 2010-09-24T11:32:00

say you declare :

byte[] bb = new byte[1024];

That means you are declaring an array of bytes with 1024 elements.

So whenever you call

bb[20] it actually calls indexer defined within the array definition which sends back the 20th element of the array.

You can also create your own Indexer using

public T this[]
{
  get { .... }
}

This will ensure you to call in similar way for you own object as you do for arrays.

symbol [ ] in c#

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