不允许使用标点符号，例如逗号或句号 [英] not allow punctuation like comma or periods

问题描述

大家好
我如何才能验证vb.net WINDOWS FORM中的文本框，以使其仅不允许两个标点字符，"和."

Hi ALL
How could i validate a textbox in vb.net WINDOWS FORM, so that it disallow only two punctuation character that is "," and "."

推荐答案

使用常规表达式验证器

如果唯一的约束是不允许标点符号，则不需要验证.最好从输入中过滤掉按键以忽略不想要的字符.为此:

1)处理TextBox.KeyPress事件;

2)在事件处理程序中，从事件参数获取KeyChar并弄清楚是否应将此字符过滤掉，在这种情况下，将事件参数的Handled分配给true.

3)方法char.IsPunctuation(char)有助于对标点符号进行分类.

在发布此答案之前，我已经在代码中对其进行了测试.

—SA

If the only constraint is to disallow punctuation character, validation is not needed. It''s better to filter out key presses to ignore unwanted characters in first place, from input. For this purpose:

1) Handle TextBox.KeyPress event;

2) In event handler, get KeyChar from event argument and figure out if this character should be filtered out, in this case, assign event argument''s Handled to true.

3) The method char.IsPunctuation(char) helps to classify punctuation characters.

I tested it in code before posting this Answer.

—SA

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