how we write foreach loop with && operator

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Hello,
I have 3 foreach loop like...

C#

foreach (DropDownList drodown in pnlTextBoxes.Controls.OfType<dropdownlist>())
 {
  foreach (DropDownList drodown1 in pnlTextBoxes.Controls.OfType<dropdownlist>())
     {
     foreach (TextBox textBox in pnlTextBoxes.Controls.OfType<textbox>())
        {
        }
     }
}

I want this all dynamic contol into single foreach loop.
I dont have idea how to write can you send me code for that.

Posted 29-Nov-15 22:10pm

Member 12097108

Updated 29-Nov-15 22:21pm

Andy Lanng

v2

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Comments

CHill60 30-Nov-15 4:23am

Why are you going through the dropdownlists twice?

Tomas Takac 30-Nov-15 4:54am

What are you trying to do? Why are the loops nested? Where does the && operator come in?

Patrice T 30-Nov-15 15:11pm

Explain what you want to do .

2 solutions

Solution 1

A foreach loop can only operate on one dimension of a single ienumerable type. To merge the lists you have you need to find a common denominator Type. In your case, the common denominator type of the first two in dropdownlist but if you include the textbox then the common denominator type is Control.

C#

List<control> controls = new List<control>();

controls.AddRange(pnlTextBoxes.Controls.OfType<dropdownlist>())
//etc</dropdownlist></control></control>

PS: you are aware that the first and second lists you have there are identical?

Another option is to select into the list using Linq:

C#

Type[] dynamicControlTypes = {typeof(DropDownList), typeof(TextBox), /*etc...*/);
foreach(Control c in pnlTextBoxes.Controls.Where(c=>dynamicControlTypes.contains(c.GetType))){

}

Posted 29-Nov-15 22:30pm

Andy Lanng

v2

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BillWoodruff · Accepted Answer · 2015-11-30T03:32:00

Solution 2

My guess is that you want to do something like this:

C#

foreach(Control cntrl in pnlTextBoxes)
{
    if(cntrl is DropDownList)
    {
       DropDownList ddl = cntrl as DropDownList;
       // handle DropDownList
    }
    else if (cntrl is TextBox)
    {
       TextBox tbx = cntrl as TextBox;
       // handle TextBox
    }
}

Posted 30-Nov-15 3:32am

BillWoodruff

Comments

[no name] 30-Nov-15 23:21pm

Was scrolling down to write exactly this, I think you nailed it. 5.