multi select texbox Collections in windowsform and change Attribute

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hello

i have multi text box with different name i want to change attribute .enable=true;

and use foreach or for
how can i ?

same

C#

foreach (Control tx in this.Controls)??????
           {
                Type c=tx.GetType();
                if (c == typeof(TextBox))
                   ????????????? i dont know

           }

for example txt1.enable=true;

Posted 10-Oct-11 10:10am

Mohammad Ali 63

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2 solutions

Solution 1

C#

foreach (Control control in this.Controls)
{
    TextBox textBox = control as TextBox;
    if (!object.ReferenceEquals(null, textBox))
        textBox.Enabled = true;
}

Posted 10-Oct-11 10:41am

DaveyM69

Comments

Luc Pattyn 10-Oct-11 21:55pm

IMO if (textBox!=null) would be adequate, no need for object.ReferenceEquals()

:)

DaveyM69 11-Oct-11 12:59pm

Hi Luc,
True, it's just a habit I've got into from being caught out occaisionally by objects that don't implement the == and != operators. If they do iplement them they will use object.ReferenceEquals() in their equality checks against null anyway so no overhead, more readable without perhaps ;)

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BillWoodruff · Accepted Answer · 2011-10-10T15:13:00

In this case, I'd want to invest a little more time and effort to get something that can be re-used. And, I'd want something that could operate on any particular kind of control, and that could be run with and without recursive checking for controls within controls:

C#

private void SetControlsEnabledProperty(bool isEnabled, bool isRecursive, string typeToCheck, Control.ControlCollection theControls)
    {
        foreach (Control theControl in theControls)
        {
            // is there a better way to handle the
            // the type checking required here ?
            if (theControl.GetType().Name == typeToCheck)
            {
                theControl.Enabled = isEnabled;
            }
            else
            {
                if (isRecursive && theControl.HasChildren)
                {
                    SetControlsEnabledProperty(isEnabled, isRecursive, typeToCheck, theControl.Controls);
                }
            }
        }
    }
}

I might call this function like this to iterate all the Controls in a Form, and set every TextBox's Enabled property to true:

SetControlsEnabledProperty(true, true, "TextBox", this.Controls);