很容易的问题，我假设.. [英] Pretty easy question, i'd assume..
问题描述
大家好，
我有一个表单，用于输入一个名称，按钮中的字母从A到Z.
当你点击一个按钮，它应该将与该按钮相关联的文本附加到文本框中。
而不是每个按钮都有一个带有单击事件的EventHandler
of：
private void btnA_Click（object sender，System.EventArgs e）
{
txtNameField.AppendText（" A"）;
}
依旧...
是有没有办法缩短这个，比如只有1个事件处理程序
所有按钮？我正在思考这个问题：
private void buttonLetter_Click（object sender，System.EventArgs e）
{
txtNameField.AppendText（letter）;
}
private void AppendLetter（letter）
{
txtNameField.AppendText（letter）;
}
我希望你能意识到我在这里所说的话。
Brian< br ************ @ gmail.com>写道：我有一个表格用于输入一个名字，按钮中的字母从A到Z.
当你点击一个按钮时，它应该附加与该按钮到一个文本框。
而不是每个按钮都有一个EventHandler点击事件
private void btnA_Click（object sender， System.EventArgs e）
{
txtNameField.AppendText（" A"）;
}
等等...
有没有办法缩短这个，例如只有1个事件处理程序
所有按钮？
绝对。使用一个事件处理程序，并使用发件人;参数
找出按下了哪个按钮。
-
Jon Skeet - < sk *** @ pobox .com>
http://www.pobox.com/~skeet
如果回复小组，请不要给我发邮件
" Brian"写道......
我有一个表单，用于输入一个名称，按钮中的字母从A到Z.
当你点击一个按钮时，它应该附加与文本框中的按钮相关联的文本。
而不是每个按钮都有一个带有点击事件的EventHandler
：
私有void btnA_Click（object sender，System.EventArgs e）
{txtNameField.AppendText（" A"）;
}
依此类推...
有没有办法缩短这个，例如只有1个事件处理程序
所有按钮？
我想这个你有每个字母作为按钮的标签吗？
在这种情况下你可以有一个方法：
private void buttonLetter_Click（object sender，System.EventArgs e）
{
按钮b =（按钮）发件人;
txtNameField.AppendText（b.Text）; < br $>
}
如果您的标签上还有其他东西，那么可能会使用按钮的标签
属性。
// Bjorn A
而不是使用DoubleClick按钮创建事件处理程序。您可以在属性窗口中使用名称中的事件处理程序bij键入
.
在evenhandler中，您可以将sender参数类型转换为按钮并且
读取
描述文本或标签等属性。
string letter =（（Button）Sender）.Tag
Hello all,
I have an form to Enter a Name with letters from A to Z in buttons.
When you click a button, it should append the text associated with
that button to a text box.
Instead of having an EventHandler for every button with a click event
of:
private void btnA_Click(object sender, System.EventArgs e)
{
txtNameField.AppendText("A");
}
And so on...
Is there a way to shorten this, such as have just the 1 Event Handler
for all buttons? I was thinking something along the lines of this:
private void buttonLetter_Click(object sender, System.EventArgs e)
{
txtNameField.AppendText(letter);
}
private void AppendLetter(letter)
{
txtNameField.AppendText(letter);
}
I hope you realise what i''m talking about here.
Brian <br************@gmail.com> wrote:I have an form to Enter a Name with letters from A to Z in buttons.
When you click a button, it should append the text associated with
that button to a text box.
Instead of having an EventHandler for every button with a click event
of:
private void btnA_Click(object sender, System.EventArgs e)
{
txtNameField.AppendText("A");
}
And so on...
Is there a way to shorten this, such as have just the 1 Event Handler
for all buttons?
Absolutely. Use one event handler, and use the "sender" parameter to
find out which button was pressed.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
"Brian" wrote...
I have an form to Enter a Name with letters from A to Z in buttons.
When you click a button, it should append the text associated with
that button to a text box.
Instead of having an EventHandler for every button with a click event
of:
private void btnA_Click(object sender, System.EventArgs e)
{
txtNameField.AppendText("A");
}
And so on...
Is there a way to shorten this, such as have just the 1 Event Handler
for all buttons?
I guess that you have each letter as the Label of the buttons?
In that case you could have a method like:
private void buttonLetter_Click(object sender, System.EventArgs e)
{
Button b = (Button) sender;
txtNameField.AppendText(b.Text);
}
If you have something else in your labels, you could possibly use the Tag
property of the buttons instead.
// Bjorn A
Instead of DoubleClick on yout button to create an eventhandler. You can make
an eventhandler bij typing in a name in the propertieswindow.
In the evenhandler you could typecast the sender parameter to a button and
read a
describing property like Text or Tag.
string letter = ((Button)Sender).Tag
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