c# - solo - Cuadro de texto enmascarado con números decimales

textbox solo numeros y punto decimal c#

Question

En mi aplicación de ventana necesito un cuadro de texto enmascarado que acepte números de decimales reales.

p.ej.
1) 1,56
2) 22.34
3) 123.34
4) 12312.34
Este todo el valor debe ser válido.

¿Alguien puede decirme cómo puedo hacer esto?
Y si alguien tiene una mejor solución para números decimales reales, en lugar de este TextBox enmascarado, me encantaría verlo.
Gracias...

Answer 1

En lugar de usar MaskedTextbox, considere usar NumericUpDown en NumericUpDown lugar. Es compatible con los números System.Decimal que son compatibles con la mayoría de los números reales que debe tener en cuenta.

La propiedad NumericUpDown.DecimalPlaces admite hasta 99 lugares decimales.

Answer 2

Use un control personalizado como este (modifíquelo para satisfacer sus necesidades):

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); 
        } 
    } 
}