使用Char.IsSymbol（）方法防止符号，不包括数学运算符 [英] Prevent symbols using Char.IsSymbol() Method excluding mathematical operators

问题描述

我希望找到一种方法来防止我的vb.net windows窗体应用程序中的符号使用带有Char.IsSymbol（）方法的datagridview，但是我希望仍然允许用户输入数学运算符到datagridview的。有没有办法阻止除数学运算符之外的所有符号？这是我到目前为止，它阻止所有符号，数学运算符，下标和上标。但是我希望在允许数学运算符的同时有一种简单的方法来阻止符号。感谢您提供的任何帮助或建议。

I'm hoping to find a way to prevent symbols in my vb.net windows forms application using a datagridview with the Char.IsSymbol() method, however I'm hoping to still allow the user to input mathmatical operators into the datagridview. Is there a way to prevent all symbols except mathmatical operators? Here is what I have so far, which prevents all symbols, math operators, subscripts and superscripts. However I'm hoping there is a simple way of preventing symbols while allowing math operators. Thanks for any help or suggestions you may offer.

If(columnindex = 0) Then ' checking value for column 1 only
Dim cellString = DataGridView1.Rows(rowindex).Cells(columnindex).value

If Char.IsSymbol(cellString)
MessageBox.Show("Special Characters Not Allowed")
End If
End If

推荐答案

无法改变IsSymbol的行为。



所以，你将不得不编写自己的方法确定什么是可接受的，什么不是。而不是黑名单已知字符，而是使用白名单。只接受你想要的字符，而不是试图过滤掉你不想要的所有字符。

There's no way to change the behavior of IsSymbol.

So, you're going to have to write your own method to determine what's acceptable and what's not. Instead of black-listing known characters, use a white-list instead. Accept only the characters you want instead of trying to filter out all the characters you don't.

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