Create array (collection) of buttons from existing buttons

问题:

is there a simple way of creating a button collection from the existing buttons on my form? (In c#).

I have a series of buttons already on my form and I want to use an index to access them...e.g.:

myButtonArray[0].ForeColor ...// Do something with it

Can this be done?

Edit: Can I set the array to have a generic OnClick event? And then determine which button in the array was clicked and, say, change its color?

回答1:

You can do it the same way as for any other array. For example:

Button[] array = { firstButton, secondButton };

or if you need to declare in one place and assign later:

Button[] array; ... array = new Button[] { firstButton, secondButton };

In C# 3+ you can use implicit typing for array initializers:

Button[] array; ... array = new[] { firstButton, secondButton };

You might also want to consider using a List<Button> instead:

List<Button> buttons = new List<Button> { firstButton, secondButton };

回答2:

LINQ to the rescue!!

Button[] buttons = this.Controls.OfType<Button>().ToArray();

回答3:

var myButtonArray = new [] {this.Button1, this.Button2, ...}

To streamline this process if there are a lot of Buttons, you could try this code at the form level:

this.Controls.OfType<Button>().ToArray();

You could recurse this with any Control in the Controls collection that has a nonempty Controls collection itself.

回答4:

something like:

var myButtonArray = new[] {btn1, btn2, btn3, btn4};

回答5:

Assuming there is a naming convention...

List<Button> asdf = new List<Button>(); for (int x = 0; x <= 10; x++) {     asdf.Add(myButton + x); }

回答6:

You have all your controls in the Controls property of your form, so you have to iterate that collection and add it to your array.

List<Button> buttons = new List<Button>();  foreach(Control c in this.Controls) {     Button b = c as Button;     if(b != null)     {         buttons.Add(b);     } }

回答7:

In response to your requirements: (Edit: Can I set the array to have a generic OnClick event? And then determine which button in the array was clicked and, say, change its color?)

List<Button> buttons = new List<Button> { firstButton, secondButton };  // Iterate through the collection of Controls, or you can use your List of buttons above. foreach (Control button in this.Controls) {     if (button.GetType() == typeof(Button)) // Check if the control is a Button.     {         Button btn = (Button)button; // Cast the control to Button.         btn.Click += new System.EventHandler(this.button_Click); // Add event to button.     } }  // Click event for all Buttons control. private void button_Click(Button sender, EventArgs e)  {     ChangeForeColor(sender); // A method that accepts a Button     // other methods to do...     // you can also check here what button is being clicked      // and what action to do for that particular button.     // Ex:     //     // switch(sender.Name)     // {     //     case "firstButton":     //         sender.ForeColor = Color.Blue;     //         break;     //     case "secondButton ":     //         sender.Text = "I'm Button 2";     //         break;     // } }  // Changes the ForeColor of the Button being passed. private void ChangeForeColor(Button btn) {     btn.ForeColor = Color.Red; }

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