WPF zone de texte pour entrer les valeurs décimales

Actuellement, je utiliser ce comportement pour le numérique et décimale d'entrée:

public class TextBoxInputBehavior : Behavior<TextBox>
{
const NumberStyles validNumberStyles = NumberStyles.AllowDecimalPoint |
NumberStyles.AllowThousands |
NumberStyles.AllowLeadingSign;
public TextBoxInputBehavior()
{
this.InputMode = TextBoxInputMode.None;
this.JustPositivDecimalInput = false;
}
public TextBoxInputMode InputMode { get; set; }
public static readonly DependencyProperty JustPositivDecimalInputProperty =
DependencyProperty.Register("JustPositivDecimalInput", typeof(bool),
typeof(TextBoxInputBehavior), new FrameworkPropertyMetadata(false));
public bool JustPositivDecimalInput
{
get { return (bool)GetValue(JustPositivDecimalInputProperty); }
set { SetValue(JustPositivDecimalInputProperty, value); }
}
protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.PreviewTextInput += AssociatedObjectPreviewTextInput;
AssociatedObject.PreviewKeyDown += AssociatedObjectPreviewKeyDown;
DataObject.AddPastingHandler(AssociatedObject, Pasting);
}
protected override void OnDetaching()
{
base.OnDetaching();
AssociatedObject.PreviewTextInput -= AssociatedObjectPreviewTextInput;
AssociatedObject.PreviewKeyDown -= AssociatedObjectPreviewKeyDown;
DataObject.RemovePastingHandler(AssociatedObject, Pasting);
}
private void Pasting(object sender, DataObjectPastingEventArgs e)
{
if (e.DataObject.GetDataPresent(typeof(string)))
{
var pastedText = (string)e.DataObject.GetData(typeof(string));
if (!this.IsValidInput(this.GetText(pastedText)))
{
System.Media.SystemSounds.Beep.Play();
e.CancelCommand();
}
}
else
{
System.Media.SystemSounds.Beep.Play();
e.CancelCommand();
}
}
private void AssociatedObjectPreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Space)
{
if (!this.IsValidInput(this.GetText(" ")))
{
System.Media.SystemSounds.Beep.Play();
e.Handled = true;
}
}
}
private void AssociatedObjectPreviewTextInput(object sender, TextCompositionEventArgs e)
{
if (!this.IsValidInput(this.GetText(e.Text)))
{
System.Media.SystemSounds.Beep.Play();
e.Handled = true;
}
}
private string GetText(string input)
{
var txt = this.AssociatedObject;
int selectionStart = txt.SelectionStart;
if (txt.Text.Length < selectionStart) 
selectionStart = txt.Text.Length;
int selectionLength = txt.SelectionLength;
if (txt.Text.Length < selectionStart + selectionLength) 
selectionLength = txt.Text.Length - selectionStart;
var realtext = txt.Text.Remove(selectionStart, selectionLength);
int caretIndex = txt.CaretIndex;
if (realtext.Length < caretIndex) 
caretIndex = realtext.Length;
var newtext = realtext.Insert(caretIndex, input);
return newtext;
}
private bool IsValidInput(string input)
{
switch (InputMode)
{
case TextBoxInputMode.None:
return true;
case TextBoxInputMode.DigitInput:
return CheckIsDigit(input);
case TextBoxInputMode.DecimalInput:
decimal d;
//wen mehr als ein Komma
if (input.ToCharArray().Where(x => x == ',').Count() > 1)
return false;
if (input.Contains("-"))
{
if (this.JustPositivDecimalInput) 
return false;
if (input.IndexOf("-",StringComparison.Ordinal) > 0) 
return false;
if(input.ToCharArray().Count(x=>x=='-') > 1)
return false;
//minus einmal am anfang zulässig
if (input.Length == 1) 
return true;
}
var result = decimal.TryParse(input, validNumberStyles, CultureInfo.CurrentCulture, out d);
return result;
default: throw new ArgumentException("Unknown TextBoxInputMode");
}
return true;
}
private bool CheckIsDigit(string wert)
{
return wert.ToCharArray().All(Char.IsDigit);
}
}
public enum TextBoxInputMode
{
None,
DecimalInput,
DigitInput
}

Le code XAML de l'utilisation ressemble à ceci:

<TextBox Text="{Binding Sum}">
<i:Interaction.Behaviors>
<Behaviors:TextBoxInputBehavior InputMode="DecimalInput"/>
</i:Interaction.Behaviors>
</TextBox>

OriginalL'auteur blindmeis

    private void DecimalTextBox_PreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
{
bool approvedDecimalPoint = false;
if (e.Text == ".")
{
if (!((TextBox)sender).Text.Contains("."))
approvedDecimalPoint = true;
}
if (!(char.IsDigit(e.Text, e.Text.Length - 1) || approvedDecimalPoint))
e.Handled = true;
}

OriginalL'auteur CMarsden

J'ai mis en place mon propre zone de texte. Il met à jour la source, quand il y a un certain nombre dans le texte, pas autrement. Sur le foyer perdu, j'ai lu la propriété source. Tout ce que vous avez à faire est de remplacer la zone de texte avec cette classe, et de lier le "Nombre" de la Propriété, qui est de type double.

public class DoubleTextBox: TextBox
{
public DoubleTextBox()
{
TextChanged += DoubleTextBox_TextChanged;
LostFocus += DoubleTextBox_LostFocus;
}
void DoubleTextBox_LostFocus(object sender, System.Windows.RoutedEventArgs e)
{
Text = Number.ToString("N2");
}
void DoubleTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
double zahl;
if (string.IsNullOrWhiteSpace(Text))
{
Number = 0;
}
else if (double.TryParse(Text, out zahl))
{
Number = Double.Parse(zahl.ToString("N2"));
}
else
{
ValidationError validationError =
new ValidationError(new ExceptionValidationRule(), GetBindingExpression(NumberProperty));
validationError.ErrorContent = "Keine gültige Zahl";
Validation.MarkInvalid(
GetBindingExpression(NumberProperty),
validationError);
}
}
public double Number
{
get { return (double)this.GetValue(NumberProperty); }
set { this.SetValue(NumberProperty, value); }
}
public static readonly DependencyProperty NumberProperty = DependencyProperty.Register(
"Number", typeof(double), typeof(DoubleTextBox), 
new FrameworkPropertyMetadata
(
0d,
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault
)
);
}

OriginalL'auteur pinki

Im nouveau, donc je ne peux pas commenter sa réponse, mais je fixe le nombre négatif questions blindmeisle code.

Juste modifier le

if (input.Contains("-"))

section de IsValidInput ()...

                if (input.Contains("-"))
{
if (this.JustPositivDecimalInput)
return false;
//minus einmal am anfang zulässig
//minus once at the beginning
if (input.IndexOf("-", StringComparison.Ordinal) == 0 && input.ToCharArray().Count(x => x == '-') == 1)
{
if(input.Length == 1)
{
//INPUT IS "-"
return true;
}
else if (input.Length == 2)
{
//VALIDATE NEGATIVE DECIMALS...INPUT IS "-."
if (input.IndexOf(".", StringComparison.Ordinal) == 1)
{
return true;
}
}
else 
{
return decimal.TryParse(input, validNumberStyles, CultureInfo.CurrentCulture, out d);
}
}
}

OriginalL'auteur cheebacat

Cette regex fonctionne

private void TextBox_PreviewTextInput(object sender, TextCompositionEventArgs e)
{
Regex regex = new Regex("^[.][0-9]+$|^[0-9]*[.]{0,1}[0-9]*$");
e.Handled = !regex.IsMatch((sender as TextBox).Text.Insert((sender as TextBox).SelectionStart,e.Text));
}

OriginalL'auteur Kavinda Gehan