Add a variable to a command

Question

Hello Everyone I want to exchange a part of a command with a variable. Have a look at this Code: private void MakeNormal(int buttonNR) { button01.Text = l; } What I need now is to change the 01 to the variable buttonNR. How can I do this? The only possibility I could think of would be checking with IF-statements but for many buttons that is a lot of code. Any help is appreciated. Btw: Why doesn't something work?

Matthias · Answer

Thank you! That did it for me. That made my code way smaller reducing these behemoth switches with 42 cases ;-)

Alan · Answer

If you're using .NET 2.0 or later try this: private void MakeNormal(int buttonNR) { Button b = (Button)(this.Controls[button + String.Format({0:D2}buttonNR)]); b.Text = l; } If the buttons are inside a panel or groupbox rather than directly on the form then change 'this' to 'panel1' etc.

Matthias · Answer

Thank you for your help! However I have a problem with implementing it. Your code ((Button)(sender)).BackColor = Color.SteelBlue; relies as far as i understand it on the button itself calling this event. (so the button is the sender ) Since I'm going to call such a method myself the sender won't be the button. Somehow I wonder why there isn't an option to evaluate variables first and afterwards embedding them in a command so that in Button[NR].Text = abc the contents of the variable [NR] gets put into the command itself then forming Button123.Text = abc; But the again maybe I'm assuming that languages are more powerful than they are =P

Scott Lysle · Answer

If I understand the question correctly you are looking for something like this; in this example I have three buttons on a form (buttons 1 2 and 3) and I have handling them all within a single method; that method uses the sender argument to determine which button was clicked and once I know which button was clicked I set the fore and background color properties on the button to show that it was clicked. You could just as easily change the text property or do some other action. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace MultipleButtons { public partial class Form1 : Form { public Form1() { InitializeComponent(); // restore the appearance of all buttons reset_buttons(); // assign the click event handler to the same method this .button1.Click += new System. EventHandler ( this .button_Click); this .button2.Click += new System. EventHandler ( this .button_Click); this .button3.Click += new System. EventHandler ( this .button_Click); } // handle all button clicks with a common method private void button_Click( object sender EventArgs e) { // restore the appearanace of all buttons reset_buttons(); // use the sender to determine which button was // clicked and set some properties on that button (( Button )(sender)).BackColor = Color .SteelBlue; (( Button )(sender)).ForeColor = Color .White; } // restore the appearance of all the buttons private void reset_buttons() { foreach ( Control c in Controls) { if (c.GetType().ToString() == System.Windows.Forms.Button ) { c.BackColor = SystemColors .ButtonFace; c.ForeColor = SystemColors .ControlText; } } } } }