WPF 数字输入框

直接上代码：
.xaml文件:一个输入框

                <TextBox 
            Name="test"             
 DataObject.Pasting="Volt_Pasting" PreviewKeyDown="Volt_PreviewKeyDown" InputMethod.IsInputMethodEnabled="False"
                   PreviewTextInput="Volt_PreviewTextInput"                        
    Style="{StaticResource MaterialDesignFilledTextFieldTextBox}"
    VerticalAlignment="Bottom"
    AcceptsReturn="True"
    TextWrapping="Wrap"
    MaxWidth="110"    
    MaxHeight="60"
    MaxLength="8"
    materialDesign:HintAssist.Hint="test）" />

.cs 文件

        private void Volt_Pasting(object sender, DataObjectPastingEventArgs e)
        {
            Dat_input_box.TextBox_Pasting(sender, e);
        }



        private void Volt_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            Dat_input_box.TextBox_OnPreviewKeyDown(e);
        }



        private void Volt_PreviewTextInput(object sender, TextCompositionEventArgs e)
        {
            Dat_input_box.TextBox_PreviewTextInput(sender, e);
        }

.cs封装库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Text.RegularExpressions;

namespace Controls.Tools
{
    class Dat_input_box
    {
        //限制非法字符输入，只允许输入数字和小数点
        public static void TextBox_PreviewTextInput(object sender,
            TextCompositionEventArgs e)
        {
            var textBox = sender as TextBox;
            //这是对中文值的判断
            if (textBox == null) return;
            //if (Regex.IsMatch(textBox.Text, @"[\u4e00-\u9fbb]+$"))
            //{
            //   textBox.Text = "";
            //   e.Handled = true;
            //  return;
            //}
            //匹配只能输入一个小数点的浮点数
            Regex numbeRegex = new Regex("^[-]?\\d+[.]?\\d*$");
            Regex zeroRegex = new Regex("^[0]+[0-9]+$");
            e.Handled =
                    !numbeRegex.IsMatch(
                        textBox.Text.Insert(
                            textBox.SelectionStart, e.Text))
                            || zeroRegex.IsMatch(
                        textBox.Text.Insert(
                            textBox.SelectionStart, e.Text));
            textBox.Text = textBox.Text.Trim();
        }

        /// <summary>
        /// 键盘输入值事件(可以小键盘上的数字键和英文输入状态下的句点键盘)
        /// </summary>
        /// <param name="e"></param>
        public static void TextBox_OnPreviewKeyDown(KeyEventArgs e)
        {
            if ((e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9 &&
                 e.KeyboardDevice.Modifiers != ModifierKeys.Shift)
                ||
                (e.Key >= Key.D0 && e.Key <= Key.D9 &&
                 e.KeyboardDevice.Modifiers != ModifierKeys.Shift) ||
                e.Key == Key.Back || e.Key == Key.Left || e.Key == Key.Right ||
                e.Key == Key.Enter || e.Key == Key.Decimal ||
                e.Key == Key.OemPeriod)
            {
                if (e.KeyboardDevice.Modifiers != ModifierKeys.None)
                {
                    e.Handled = false;
                }
            }
            else
            {
                e.Handled = true;
            }
        }

        /// <summary>
        ///  禁止粘贴
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public static void TextBox_Pasting(object sender, DataObjectPastingEventArgs e)
        {
            if (e.DataObject.GetDataPresent(typeof(String)))
            {
                String text = (String)e.DataObject.GetData(typeof(String));
                if (!isNumberic(text))
                { e.CancelCommand(); }
            }
            else { e.CancelCommand(); }
        }

        public static bool isNumberic(string _string)
        {
            if (string.IsNullOrEmpty(_string))
                return false;
            foreach (char c in _string)
            {
                if (!char.IsDigit(c))
                    //if(c<'0' c="">'9')//最好的方法,在下面测试数据中再加一个0，然后这种方法效率会搞10毫秒左右
                    return false;
            }
            return true;
        }
    }
}

附录：
1、C#正则验证大全 Regex.IsMatch()正则表达式验证