我想在WPF中创建一个带有依赖属性的数字文本框的自定义控件,在我的解决方案中,我添加一个WPF应用程序和自定义控件(WPF),然后在公共类中,我创建依赖属性....
现在我不知道如何为文本框编写规则以及哪个事件属实?
另一个问题:数字文本框的规则是什么,此文本框必须为数字和。和分隔 .this自定义文本框用于会计系统。
public static readonly DependencyProperty NumberTextbox;
static Numeric()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(Numeric), new FrameworkPropertyMetadata(typeof(Numeric)));
FrameworkPropertyMetadata metadata = new FrameworkPropertyMetadata("Enter Your Text", OnKeyDown);
NumberTextbox =DependencyProperty.Register("Text", typeof(TextBox), typeof(FrameworkElement), metadata);
}
public string NumberTXT
{
get { return (string)GetValue(NumberTextbox); }
set { SetValue(NumberTextbox, value); }
}
答案 0 :(得分:2)
我建议您在下面的示例代码中添加另一个Dependency Property,我将其命名为Value 还可以使用逗号或NumberFormatInfo.CurrentInfo.NumberDecimalSeparator格式化数字 并通过两个属性SelectionLength和SelectionStart控制插入符号位置。 最后是更详细和完整的代码WPF Maskable Number Entry TextBox
public static readonly DependencyProperty ValueProperty =
DependencyProperty.Register("Value", typeof(double), typeof(NumericTextBox), new PropertyMetadata(new Double(), OnValueChanged));
private static void OnValueChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
//var numericBoxControl = (NumericTextBox)sender;
}
public double Value
{
get { return (double)GetValue(ValueProperty); }
set { SetValue(ValueProperty, value); Text = value.ToString("###,###,###"); }
}
protected override void OnPreviewTextInput(TextCompositionEventArgs e)
{
base.OnPreviewTextInput(e);
var txt = e.Text.Replace(",", "");
e.Handled = !IsTextAllowed(txt);
if (IsTextAllowed(txt))
{
if (Text.Length == 3)
{
Text = Text.Insert(1,",");
SelectionLength = 1;
SelectionStart += Text.Length;
}
}
}
protected override void OnPreviewKeyDown(KeyEventArgs e)
{
base.OnPreviewKeyDown(e);
if (e.Key == Key.Back)
{
if (Text.Length == 5)
{
Text = Text.Replace(",", "");
SelectionLength = 1;
SelectionStart += Text.Length;
}
}
}
protected override void OnTextChanged(TextChangedEventArgs e)
{
var txt = Text.Replace(",", "");
SetValue(ValueProperty, txt.Length==0?0:double.Parse(txt));
base.OnTextChanged(e);
}
private static bool IsTextAllowed(string text)
{
try
{
double.Parse(text);
return true;
}
catch (FormatException)
{
return false;
}
}
答案 1 :(得分:1)
我完全不明白你的问题,为什么你需要依赖项属性来制作一个数字文本框自定义控件。你可以做的是继承文本框并处理PreviewTextInput,就像它在this question by Ray中解决一样:
然后你得到:
public class NumericTextBox : TextBox
{
public NumericTextBox()
{
PreviewTextInput += NumericTextBox_PreviewTextInput;
}
void NumericTextBox_PreviewTextInput(object sender, System.Windows.Input.TextCompositionEventArgs e)
{
e.Handled = !isTextAllowed(e.Text);
}
private static bool isTextAllowed(string text)
{
var regex = new Regex("[^0-9]+");
return !regex.IsMatch(text);
}
}
你可以这样使用它:
<myNameSpace:NumericTextBox />
现在您可以添加任何其他所需的验证。
我还会为粘贴问题实现一个解决方案,例如(参见链接):
private void textBoxPasting(object sender, DataObjectPastingEventArgs e)
{
if (e.DataObject.GetDataPresent(typeof(String)))
{
var text = (String)e.DataObject.GetData(typeof(String));
if (!isTextAllowed(text))
{
e.CancelCommand();
}
}
else
{
e.CancelCommand();
}
}
答案 2 :(得分:0)
干得好,但是让我用C#中的UserControl来完成以下任务:
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace NumericBox
{
public partial class NumericBox : TextBox
{
public NumericBox
{
this.TextAlign = HorizontalAlignment.Right;
this.Text = "0,00";
this.KeyPress += NumericBox_KeyPress;
}
public double NumericResult
{
get{
double d = Convert.ToDouble(this.Text.Replace('.', ','));
return d;
}
}
private void NumericBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && (e.KeyChar != '.'))
e.Handled = true;
if ((e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1))
e.Handled = true;
if (e.KeyChar == 13)
{
e.Handled = true;
SendKeys.Send("{TAB}");
}
}
}
}