仅为包含电话号码的文本框显示数字小键盘 [英] Show Numeric keypad only for textbox containing phone number

问题描述

我有一个文本框，它只能包含数字。与添加新联系人时的电话号码文本框类似。以编程方式，我们如何只打开数字键盘而不是文本/数字键盘。


这样用户就无法随时输入文本。虽然可以在以后对符号进行验证。

您是否可以提供一个代码片段，仅用于打开数字小键盘，仅为文本框输入数字。

I have a text box and it can contain only numbers. Similar to a phone number text box while adding a new contact. Programatically how can we open only the numeric keypad instead of both text/numeric keypad.

By this the user cannot enter text at anytime. Though validation for symbols can be made later.
Can you provide a code snippet for opening only a numeric keypad to enter numbers only for the text box.

推荐答案

这与你打开的键盘无关。

文本框有一个.KeyPress事件。

你为该事件编写一个方法（一个处理程序） ）检查刚刚按下的键是否为数字。如果它是一个数字你允许它。如果它不是，你就把它扔掉。


这很常见，我肯定谷歌的C＃数字文本框将为您提供十几个示例。

This has nothing to do with what keypad you open.
The textbox has a .KeyPress event.
You write a method for that event (a handler) that checks if the key just pressed was a number or not. If it was a number you allow it. If it wasn''t, you throw it away.

This is VERY common and I''m sure a Google for "C# numeric textbox" will get you a dozen examples.

如果您想让它旋转一下，还有一个制作自己的屏幕数字键盘的教程。
这个收银机教程就是这样做的：它是一个虚拟数字键盘。

There is also a tutorial for making your own on-screen numeric keypad if you want to give it a whirl.
This tutorial for a cash register does exactly that: It makes a virtual numeric keyboard.

输入数字的验证已经完成如下：

The validation of entering numbers is already done as:

展开 | 选择 | Wrap | 行号

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