如何仅在 TextBox 中注册数字?(我没有 KeyPress 事件) [英] How can I register only numbers in TextBox?(i dont have KeyPress event)

问题描述

我试图只允许在 TextBox、C# UWP XAML 中注册数字我没有 KeyPress 事件，我该怎么办?

I am trying to allow to register only numbers in TextBox, C# UWP XAML and i dont have the KeyPress Event what should i do?

与我想要做的等效的 WinForms 是这样的:

The WinForms equivalent of what I want to do is this:

private void txtbox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar)) 
    {
        e.Handled = true;
    }
}

推荐答案

您可以使用 KeyDown 和 KeyUp 事件.我在 Windows 10 操作系统上的 UWP 应用上测试了这段代码.工作正常.

You can use KeyDown and KeyUp events. I tested this code on UWP app on Windows 10 OS. Working fine.

<TextBox InputScope="NumberFullWidth" KeyDown="TextBox_KeyDown"></TextBox>

InputScope 将在触摸设备上打开特定设备的键盘.

InputScope will open specific device keyboard on touch device.

private void TextBox_KeyDown(object sender, Windows.UI.Xaml.Input.KeyRoutedEventArgs e)
{
    if (e.Key.ToString().Equals("Back"))
    {
        e.Handled = false;
        return;
    }
    for (int i = 0; i < 10; i++)
    {
        if (e.Key.ToString() == string.Format("Number{0}", i))
        {
            e.Handled = false;
            return;
        }
    }
    e.Handled = true;
}

PS:您需要更改此代码以支持带小数点的数字和任何其他字符(如果要支持).

PS: You need to change this code to support numbers with decimal points and any other characters (if want to support).

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