Why does the Find () method return an array?

Question

I want to find a TextBox named "textBoxQH_N", where "_N" is a number from 1..96.

So, I have this code:

String sTextBoxToFind = String.Format("textBoxQH{0}", QuarterHour);
TextBox tb = (TextBox)this.Controls.Find(sTextBoxToFind, true);

... but he gave me: "It is not possible to convert the type" System.Windows.Forms.Control [] "to" System.Windows.Forms.TextBox "

So, I changed the second line to capture only the first val returned:

TextBox tb = (TextBox)this.Controls.Find(sTextBoxToFind, true)[0];

What seems to work, but shouldn't the Control Name property be unique to its owner? IOW, Find () should only return 0..1 controls, right?

+3

B. Clay Shannon Apr 23 '12 at 17:21

4 answers

Find , , , . LINQ First , - ?

+3

Justin Pihony 23 . '12 17:24

. :

Control[] tb = this.Controls.Find("textBox1", true); //change the name of the control

TextBox[] tbs = (TextBox[])this.Controls.Find("tb1", true);

, CAST ( TextBoxes). , ,

+1

Mitja Bonca Apr 23 '12 at 17:24

From an API design point of view, formats 0 and 1 are best returned as IEnumerable / collection / array to avoid null checking.

As indicated in other answers, the name of the control does not have to be globally unique, and Find can indeed return more than one element.

+1

Alexei Levenkov Apr 23 '12 at 17:27

Servy · Accepted Answer · 2012-04-23T17:24:40+0000

Find, , true, . "" , . "" .

, First FirstOrDefault, , , [0] . .