Textbboxa para formatı nasıl yapılır?

Textboxdan yeni birtane üretip custom control yapabilirsinizAşağıdaki kod işinizi görecektir.

 

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using System;
using System.ComponentModel;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace CustomControls
{
    public enum PasteRejectReasons
    {
        Unknown = 0,
        NoData,
        InvalidCharacter,
        Accepted
    }

    public class DecimalTextBox : TextBox
    {
        public const int WM_PASTE = 0x0302;
        public event EventHandler<KeyRejectedEventArgs> KeyRejected;
        public event EventHandler<PasteEventArgs> PasteRejected;

        private bool _DecimalSeparator = false;
        private int _Precision;

        public new HorizontalAlignment TextAlign
        {
            get { return base.TextAlign; }
            set { base.TextAlign = value; }
        }

        public int Precision
        {
            get { return _Precision; }
            set { _Precision = value; }
        }

        public DecimalTextBox()
        {
            TextAlign = HorizontalAlignment.Right;
            Precision = 3;
        }

        protected override void OnGotFocus(EventArgs e)
        {
            SelectAll();
            base.OnGotFocus(e);
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            bool validate = true;

            if (Text.Contains(".") || Text.Contains(","))
            {
                int indexSep;
                string[] split;
                string partiDecimal = "";

                if (Text.Contains("."))
                    indexSep = Text.IndexOf('.');
                else
                    indexSep = Text.IndexOf(',');

                split = Text.Split(new char[] { ',', '.' });
                partiDecimal += split[1];

                if (partiDecimal.Length >= Precision)
                    if (SelectionStart > Text.Length - (partiDecimal.Length + 1))
                        validate = false;
            }

            bool result = true;

            bool validateKeys = (e.KeyCode == Keys.Enter);

            bool numericKeys = (
                ((e.KeyCode >= Keys.D0 && e.KeyCode <= Keys.D9) ||
                (e.KeyCode >= Keys.NumPad0 && e.KeyCode <= Keys.NumPad9))
                && e.Modifiers != Keys.Shift
                && validate);

            bool ctrlA = e.KeyCode == Keys.A && e.Modifiers == Keys.Control;

            bool editKeys = (
                (e.KeyCode == Keys.Z && e.Modifiers == Keys.Control) ||
                (e.KeyCode == Keys.X && e.Modifiers == Keys.Control) ||
                (e.KeyCode == Keys.C && e.Modifiers == Keys.Control) ||
                (e.KeyCode == Keys.V && e.Modifiers == Keys.Control) ||
                e.KeyCode == Keys.Delete ||
                e.KeyCode == Keys.Back);

            bool navigationKeys = (
                e.KeyCode == Keys.Up ||
                e.KeyCode == Keys.Right ||
                e.KeyCode == Keys.Down ||
                e.KeyCode == Keys.Left ||
                e.KeyCode == Keys.Home ||
                e.KeyCode == Keys.End);

            bool decimalSeparator = ((
                e.KeyCode == Keys.Decimal ||
                e.KeyValue == 190 ||
                e.KeyValue == 188)&&
                TextLength != 0 &&
                SelectionLength == 0);

            if (decimalSeparator) 
            {
                if (!_DecimalSeparator)
                    _DecimalSeparator = true;
                else
                    decimalSeparator = false;
            }

            if (!(numericKeys || editKeys || navigationKeys || decimalSeparator || validateKeys))
            {
                if (ctrlA)
                    SelectAll();

                result = false;
            }

            if (!result)
            {
                e.SuppressKeyPress = true;
                e.Handled = true;

                if (!ctrlA)
                    OnKeyRejected(new KeyRejectedEventArgs(e.KeyCode));
            }
            else
                base.OnKeyDown(e);
        }

        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            if (e.KeyChar == ';' || e.KeyChar == '?')
            {
                if (!(Text.Contains(",") || Text.Contains(".")))
                    _DecimalSeparator = false;
                e.Handled = true;
            }
        }

        protected override void OnTextChanged(EventArgs e)
        {
            bool invalid = false;
            int i = 0;
            foreach (char c in Text) // Check for any non digit characters.
            {
                if (!(char.IsDigit(c) || c == ',' || c == '.'))
                {
                    invalid = true;
                    break;
                }

                if (c == ',' || c == '.')
                    i++;
            }

            if (i == 0)
                _DecimalSeparator = false;
            else if (i > 1)
                invalid = true;

            if (invalid)
            {
                Text = "";
                return;
            }

            if (Text.Contains(".") || Text.Contains(","))
            {
                string charSep = "";
                string[] split;
                string partiEntier = "";

                if (Text.Contains("."))
                    charSep = ".";
                else
                    charSep = ",";

                split = Text.Split(new char[] { ',', '.' });
                partiEntier += split[0];
                if (partiEntier == "")
                    Text = "0" + charSep + split[1];
            }
            base.OnTextChanged(e);
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_PASTE)
            {
                PasteEventArgs e = CheckPasteValid();
                if (e.RejectReason != PasteRejectReasons.Accepted)
                {
                    m.Result = IntPtr.Zero;
                    OnPasteRejected(e);
                    return;
                }
            }
            base.WndProc(ref m);
        }

        private PasteEventArgs CheckPasteValid()
        {
            PasteRejectReasons rejectReason = PasteRejectReasons.Accepted;
            string originalText = Text;
            string clipboardText = string.Empty;
            string textResult = string.Empty;

            try
            {
                clipboardText = Clipboard.GetText(TextDataFormat.Text);
                if (clipboardText.Length > 0)
                {

                    textResult = (
                        Text.Remove(SelectionStart, SelectionLength).Insert(SelectionStart, clipboardText));
                    foreach (char c in clipboardText)
                    {
                        if (!char.IsDigit(c))
                        {
                            rejectReason = PasteRejectReasons.InvalidCharacter;
                            break;
                        }
                    }
                }
                else
                    rejectReason = PasteRejectReasons.NoData;
            }
            catch
            {
                rejectReason = PasteRejectReasons.Unknown;
            }
            return new PasteEventArgs(originalText, clipboardText, textResult, rejectReason);
        }

        protected virtual void OnKeyRejected(KeyRejectedEventArgs e)
        {
            EventHandler<KeyRejectedEventArgs> handler = KeyRejected;
            if (handler != null)
                handler(this, e);
        }

        protected virtual void OnPasteRejected(PasteEventArgs e)
        {
            EventHandler<PasteEventArgs> handler = PasteRejected;
            if (handler != null)
                handler(this, e);
        }
    }
}