vb.net 单击按钮时从文本框中删除最后一个字符
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Remove last character from textbox on button click
提问by Kashish Arora
I have a textbox, textbox1, whose ReadOnlyproperty is set to true. It is somewhat like an on-screen keyboard. When the user presses a button, I can add characters by using:
我有一个textbox, textbox1，其ReadOnly属性设置为 true。它有点像屏幕键盘。当用户按下按钮时，我可以使用以下方法添加字符：
Textbox1.Text = Textbox1.Text & A
But, when the user wants to remove the text, which should work exactly like the Backspace key, the last character should be removed from the textbox.
但是，当用户想要删除应该与Backspace 键完全相同的文本时，应该从textbox.
I am ready to give up normal textboxand use richtextboxif there is any way ahead with the rich one.
我准备放弃正常textbox使用，richtextbox如果有任何方法可以使用富人。
How to remove last character of a textbox with a button?
如何使用按钮删除文本框的最后一个字符？
回答by Cody Popham
The previously suggested SubStringmethod is what I would have posted too. However, there is an alternative. The Removemethod works by removing every character after the given index. For instance:
之前建议的SubString方法也是我会发布的。但是，还有一种选择。该Remove方法的工作原理是删除给定索引后的每个字符。例如：
TextBox1.Text = Textbox1.Text.Remove(TextBox1.Text.Length - 1)
回答by Steven Doggart
You can use the SubStringmethod to get all but the last character, for instance:
您可以使用该SubString方法获取除最后一个字符之外的所有字符，例如：
TextBox1.Text = TextBox1.Text.SubString(0, TextBox1.Text.Length - 1)
回答by Mnt.Jafarzadeh
The above functions such as Substringand Removeare not executed in Visual Basic 6 (or earlier versions). I recommend to use Midfunction.
上述功能如Substring和Remove在 Visual Basic 6（或更早版本）中不执行。我建议使用Mid函数。
For instance,in this example last character of Hellois deleted and rest of word is saved in Text1
例如，在这个例子中，最后一个字符Hello被删除，剩下的单词被保存在Text1
Text1=Mid("Hello",1, Len("Hello") - 1)
and result is Text1=Hell
结果是 Text1=Hell
