WPF中的数值数据输入 [英] Numeric Data Entry in WPF

问题描述

您如何在WPF应用程序中处理数字值的输入？

How are you handling the entry of numeric values in WPF applications?

没有NumericUpDown控件，我一直在使用TextBox并使用它来处理其PreviewKeyDown事件

Without a NumericUpDown control, I've been using a TextBox and handling its PreviewKeyDown event with the code below, but it's pretty ugly.

有没有人找到一种更优雅的方式来从用户那里获取数字数据而不依赖第三方控件？

Has anyone found a more graceful way to get numeric data from the user without relying on a third-party control?

private void NumericEditPreviewKeyDown(object sender, KeyEventArgs e)
{
    bool isNumPadNumeric = (e.Key >= Key.NumPad0 && e.Key <= Key.NumPad9) || e.Key == Key.Decimal;
    bool isNumeric = (e.Key >= Key.D0 && e.Key <= Key.D9) || e.Key == Key.OemPeriod;

    if ((isNumeric || isNumPadNumeric) && Keyboard.Modifiers != ModifierKeys.None)
    {
        e.Handled = true;
        return;
    }

    bool isControl = ((Keyboard.Modifiers != ModifierKeys.None && Keyboard.Modifiers != ModifierKeys.Shift)
        || e.Key == Key.Back || e.Key == Key.Delete || e.Key == Key.Insert
        || e.Key == Key.Down || e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up
        || e.Key == Key.Tab
        || e.Key == Key.PageDown || e.Key == Key.PageUp
        || e.Key == Key.Enter || e.Key == Key.Return || e.Key == Key.Escape
        || e.Key == Key.Home || e.Key == Key.End);

    e.Handled = !isControl && !isNumeric && !isNumPadNumeric;
}

推荐答案

如何：

protected override void OnPreviewTextInput(System.Windows.Input.TextCompositionEventArgs e)
{
    e.Handled = !AreAllValidNumericChars(e.Text);
    base.OnPreviewTextInput(e);
}

private bool AreAllValidNumericChars(string str)
{
    foreach(char c in str)
    {
        if(!Char.IsNumber(c)) return false;
    }

    return true;
}

这篇关于WPF中的数值数据输入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！