WinForms按钮数组 [英] WinForms Button Array

问题描述

我正在学习C＃，并且已经练习了如何使用Windows Forms创建计算器。现在，我只添加了9个数字按钮和4个用于随意操作（+，-，*，/）的按钮，以及一个将数字写为字符串的标签。目前我正在这样做：

I'm learning C# and I've got the exercise to create a calculator with Windows Forms. Right now I just added 9 buttons for the numbers and 4 buttons for the casual operations (+,-,*,/) and a label to write in the numbers as strings. Currently I'm doing this:

private void button1_Click(object sender, EventArgs e)
{
    WriteInLabel(1);
}

private void button2_Click(object sender, EventArgs e)
{
    WriteInLabel(2);
}
//etc.

//function to write the Text in label1
private void WriteInLabel(int i)
{
    label1.Text += i.ToString();
}

记住DRY原理，这对我来说似乎是不好的编写代码。
有没有办法写得更好？我想到了类似按钮数组/列表的东西。所以我可以做这样的事情：

And remembering the DRY principle, this looks like kind of bad written code to me. Is there a way to write this better? I thought of something like a button array/List. So I could do something like this:

for(int i = 0; i < btnArr.Length; i++)
{
    //Is this the correct syntax for appending an eventListener?
    btnArr[i]Click += (sender, args) => WriteInLabel(i);         
}

现在的问题是，我想在Windows中编辑按钮属性-forms-Designer-View。
我可以得到由这样的自写代码创建的按钮的设计视图吗？

Now the problem is, I wanted to edit the button-properties in the Windows-forms-Designer-View. Can I get the Design-View of Buttons created by self-written code like this?

Button btn1 = new Button();

或者是否可以从Form1中自动创建按钮数组？
我尝试了此操作（没有用）：

Or is it possible to automatically create an array of the buttons from the Form1? I tried this (didn't work):

List<Button> btnList = new List<Button>();
foreach(Button btn in Form1)
{
    btnList.Add(btn);   
}

推荐答案

如果按钮名称遵循某种模式（例如，单词按钮加数字），您可以使用循环从控件形式的集合中按名称收集它们：

if button names follow some pattern (e.g. word "button" plus number), you can use a loop to collect them by names from Controls collection of the form:

List<Button> btnList = 
    Enumerable.Range(1,9)
    .Select(i => (Button)this.Controls["button"+i.ToString()])
    .ToList();

如果按钮的数量很小，那么将它们全部简单地列出在集合初始值设定项中就很有意义：

if number of buttons is small, it also makes sence to simply list them all in a collection initializer:

var btnList = new List<Button> { button1, button2, button3, ... button9};

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