C# 在 CurrentItemChanged 上将文本框的内容设置为大写
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Setting the contents of a textBox to upper-case on CurrentItemChanged
提问by Sakkle
I would like the text in my textBox to be set to upper-case whenever currentItemChanged is triggered. In other words, whenever the text in the box changes I'd like to make the contents upper-case. Here is my code:
我希望在触发 currentItemChanged 时将我的 textBox 中的文本设置为大写。换句话说，每当框中的文本发生变化时，我都想让内容大写。这是我的代码：
private void rootBindingSource_CurrentItemChanged(object sender, System.EventArgs e)
{
toUserTextBox.Text.ToUpper();
readWriteAuthorization1.ResetControlAuthorization();
}
The event triggers for sure, I've tested with a messageBox. So I know I've done something wrong here... the question is what.
该事件肯定会触发，我已经使用 messageBox 进行了测试。所以我知道我在这里做错了……问题是什么。
采纳答案by BFree
Strings are immutable. ToUpper() returns a new string. Try this:
字符串是不可变的。ToUpper() 返回一个新字符串。尝试这个：
private void rootBindingSource_CurrentItemChanged(object sender, System.EventArgs e)
{
toUserTextBox.Text = toUserTextBox.Text.ToUpper();
readWriteAuthorization1.ResetControlAuthorization();
}
回答by Romias
I imagine that your question is Why your code is not working.
我想你的问题是为什么你的代码不起作用。
You are not assigning the "Uppered" text to the textbox again.
您不会再次将“Uppered”文本分配给文本框。
Should be:
应该：
private void rootBindingSource_CurrentItemChanged(object sender, System.EventArgs e)
{
toUserTextBox.Text = toUserTextBox.Text.ToUpper();
readWriteAuthorization1.ResetControlAuthorization();
}
回答by John Myczek
If all you need to do is force the input to upper case, try the CharacterCasingproperty of the textbox.
如果您需要做的只是强制输入为大写，请尝试使用文本框的CharacterCasing属性。
toUserTextBox.CharacterCasing = CharacterCasing.Upper;
