Press Enter Key Code in C#?

Question

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i have a dialogbox that has only text box and receive only
integer i have done all validation except the Following ...
when user press Enter it should Check whether Textbox is empty or not...
if not then do something otherwise this.close();
my below code doesn't work when user Press a Key the dialogueBOx Close() it self

C#

if (Convert.ToInt32(e.KeyChar) == 13 && txtsearhkey.Text.Length>0)
            {
                frmviewpemaish vp = new frmviewpemaish();
                vp.psearchkey = psearch;
                vp.MdiParent = this.ParentForm;
                
                vp.Show();
                vp.loadclient(txtsearhkey.Text);
                this.Close();
               }
                else
                 { 
                  this.Close(); 
                 }
               }

Posted 6-Feb-14 7:03am

abdul manan 7

Updated 10-Feb-14 6:13am

v2

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Comments

joshrduncan2012 6-Feb-14 13:10pm

Why doesn't it work? What error are you seeing?

abdul manan 7 6-Feb-14 13:14pm

when i press a key(any key) the dialog box close()

3 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2014-02-06T07:16:00

Enter is not character; and there is no such characters. And this is always a bad idea to convert characters to integer; remember, this is Unicode. And keys are generally not character, they are handled before characters are created. To handle key hits, you need to handle events like KeyDown or KeyUp. For example:

C#

this.KeyDown += (sender, eventArgs) => {
    if (eventArgs.KeyCode == Keys.Enter)
        DoSomething();
    //...
}

Another bad idea is using MDI, ever. Why torturing yourself and scaring off your users?
Do yourself a great favor: do not use MDI at all. You can do much easier to implement design without it, with much better quality. MDI is highly discouraged even by Microsoft, in fact, Microsoft dropped it out of WPF and will hardly support it. More importantly, you will scare off all your users if you use MDI. Just don't. Please see:
http://en.wikipedia.org/wiki/Multiple_document_interface#Disadvantages[^],
How to Create MDI Parent Window in WPF?[^].

I can explain what to do instead. Please see my past answers:
How to Create MDI Parent Window in WPF? [Solution 2],
Question on using MDI windows in WPF[^],
MDIContainer giving error[^],
How to set child forms maximized, last childform minimized[^].

—SA

abdul manan 7 · Accepted Answer · 2014-02-06T08:00:00

Solution 2

i solved my self Thanks for Replay

C#

if (Convert.ToInt32(e.KeyChar) == 13)
            {
                if (txtsearhkey.Text.Length > 0)
                {
                    frmviewpemaish vp = new frmviewpemaish();
                    vp.psearchkey = psearch;
                    vp.MdiParent = this.ParentForm;

                    vp.Show();
                    vp.loadclient(txtsearhkey.Text);
                    this.Close();
                }
                else
                {
                    this.Close();
                }

Posted 6-Feb-14 8:00am

abdul manan 7

Updated 6-Feb-14 8:17am

v2

Comments

BillWoodruff 7-Feb-14 3:55am

How are you making sure your TextBox only has integers ? If you want to see a different way of handling what you describe here, just ask, and I'll post some code I use.

abdul manan 7 8-Feb-14 0:25am

yes tell me a different way that's y i posted here
i am new to C#

BillWoodruff 9-Feb-14 9:34am

Before I post some code, let me ask you if you want to allow the minus-sign and decimal point in what is entered in the TextBox.

BillWoodruff · Accepted Answer · 2014-02-14T13:51:00

As promised to OP: some sample code (adapted from code in actual use) to create a UserControl with a TextBox that accepts only integers, a minus-sign as the first character, and that auto-hides when the 'Enter Key is pressed:

C#

using System;
using System.Windows.Forms;

namespace YourNameSpace
{
    public partial class ucIntegerOnly : UserControl
    {
        public ucIntegersOnly()
        {
            InitializeComponent();
        }

        // only this nullable Int64 property is exposed
        public Int64? EnteredValue { private set; get; }

        private Int32 maxInt64Length = Int64.MaxValue.ToString().Length;

        private void UserControl1_Load(object sender, EventArgs e)
        {
            EnteredValue = null;
            tbxIntegerEntry.Clear();
        }

        private void tbxIntegerEntry_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                string mTxt = tbxIntegerEntry.Text;

                EnteredValue = null;

                // don't evaluate if Text is empty or only minus sign
                if (mTxt != String.Empty && mTxt != "-")
                {
                    EnteredValue = Convert.ToInt64(mTxt);
                    this.Hide();
                }
            }

            e.SuppressKeyPress =
            !(
                // backspace allowed
                e.KeyCode == Keys.Back
                ||
                // must not exceed length limit
                tbxIntegerEntry.Text.Length <= maxInt64Length
                &&
                // digits allowed
                char.IsDigit(Convert.ToChar(e.KeyCode))
                ||
                // minus sign allowed at position #0
                (tbxIntegerEntry.Text.Length == 0) && (e.KeyCode == Keys.OemMinus)
            );
        }
    }
}

Press Enter Key Code in C#?

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Press Enter Key Code in C#?

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