understanding how lamda expression works

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VS2010

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Regex regex = new Regex("^[a-zA-Z0-9,-_ ]{2,12}$");
            return panel1.Controls.OfType<UserControl1>().Select(uc => uc.comboBox2).Any(cb => cb.Text == String.Empty);

as the code is for validation i am implementing this but i dont know how it works and where it flows. can anyone help me to understand this line

return panel1.Controls.OfType<UserControl1>().Select(uc => uc.comboBox2).Any(cb => cb.Text == String.Empty);

Posted 26-Feb-13 5:13am

sariqkhan

Updated 26-Feb-13 5:18am

v4

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Matej Hlatky · Answer 1 · 2013-02-26T05:55:00

The code

C#

panel1.Controls.OfType<usercontrol1>().Select(uc => uc.comboBox2).Any(cb => cb.Text == String.Empty);</usercontrol1>

can be splitted into three pieces:

C#

panel1.Controls.OfType<usercontrol1>()</usercontrol1>

filter[^] panel1 controls only of type UserControl1.

C#

.Select(uc => uc.comboBox2)

select[^] comboBox2 property/field of that UserControl1 instance.

C#

.Any(cb => cb.Text == String.Empty);

Check if any[^] satifies above condition (text is empty).
In human language (in reverse order): Check, if there is any occurrence of ComboBox with empty text inside controls of type UserControl1 within the panel1.